The Shastry-Sutherland lattice is one of the paradigmatic geometries used in frustrated magnetism, and the properties of the Heisenberg and Ising models on this lattice have been studied extensively over the last two decades. The Heisenberg model has several well identified properties, including a spin gap and a remarkable series of magnetization plateaus at $1/8$, $2/15$, $1/6$, $1/4$, $1/3$,...
Induction-heating of nanoparticles placed inside chemical reactors is an alternative green approach for heating high-temperature endothermic catalytic reactions such as steam methane reforming (SMR) [1,2]. As of today, most of the world's hydrogen is produced from natural gas through SMR, but the reaction has conventionally been heated by firing, causing $\sim 1 \%$ of the world’s CO$_2$...
The antiferromagnetic spin-$1/2$ spin chain with Heisenberg-Ising (XXZ) anisotropy is a rich source of novel phenomena. Good physical realizations are the compounds SrCo$_2$V$_2$O$_8$ and BaCo$_2$V$_2$O$_8$ where the Co$^{2+}$ ions have effective spin-$1/2$ and are coupled by antiferromagnetic interactions into chains while collinear long-range magnetic order occurs below $T_N\approx 5$ K due...
Despite the complexity of high-$T_c$ cuprates, we have identified a series of surprisingly simple and universal behaviors [1-7]. Building on these findings, we show [8,9] that the phenomenology of cuprates across the phase diagram can be fully described by two relatively simple relations:
$\hspace{2cm}$$1 + p = n_{loc} + n_{eff}\;\; (1)\hspace{2cm} \rho_S = n_{eff}\cdot(O_S\,n_{loc})\;\;...
The emergence of $2$D materials has transformed solid-state physics. The key factor driving research into $2$D materials is the ability to efficiently control the atomic-scale physical properties of monolayers and their heterostructures, which involve weak yet important van der Waals interactions. Spintronics aims to utilize the spin of conduction electrons to develop devices like spin...
Janus monolayers of transition metal dichalcogenides (TMDs) constitute a highly interesting group of modern $2$D materials, due to the in-built symmetry breaking and its non-trivial consequences [1]. Among various TMDs, the structures forming charge density waves (CDWs) at low temperatures offer highly complex physics.
In the paper, we report a computational, density functional...
Spin transfer electronics (spintronics) promises an outstanding improvement of basic electronic devices by incorporating the electron’s spin degree of freedom instead of (or in addition to) their charge. Spin polarized Heusler alloys are highly relevant for spintronic applications owning to their predicted half-metallicity, high Curie temperature and high magnetic moment.
Cylindrical...
Layered double hydroxides (LDH) belong to the family of anionic clays which are promising for such applications as water treatment, drug delivery and sensing. LDH are composed of the mixed metal layers where metal cations are surrounded by the edge-linked hydroxide octahedra [1]. The present study is focused on the low-temperature static and dynamic magnetic properties of the...
Transmission electron microscopes (TEMs) are versatile instruments providing a wealth of information about materials, such as their elemental composition, local crystal structure, defects or strains and more. Electrons as moving charged particles are also influenced by magnetism in the samples, however, this interaction is typically $3-4$ orders of magnitude weaker than the interaction of...
Heterostructures of transition metal dichalcogenides and graphene provide vast utilization in proposals of novel platform devices [1] benefiting from the proximity-induced effects [2]. Monolayer $1$T-TaS$_2$ is a peculiar example as it is known for its low-temperature magnetism and charge density phase (CDW). The CDW arises as a spontaneous distortion in $1$T-TaS$_2$, forming the David star...
Two-dimensional (2D) van der Waals (vdW) magnetic materials have gained much attention because of their fundamental properties and notable potential applications in spintronics and data storage
We will present the results of our research on complex magnetic excitations in vdW vanadium trihalides VX$_3$. Particularly, vanadium triiodide VI$_3$ is a peculiar example because it hosts a unique...
Magnetic nanoparticles exhibit distinctive properties governed by nanoscale effects, making them uniquely suitable for advanced technological and biomedical applications [1]. Among various designs, core/shell nanoparticles composed of spinel ferrites stand out due to their tunable magnetic responses arising from the interplay of intra- and interparticle effects [2, 3].
In this talk, we...
The interplay of structural disorder and magnetism in oxide nanoparticles is a fascinating subject of recent interest. The present work reviews magnetic properties of nanoscale magnetoceramics with a variety of structure types (cubic spinel, perovskite, hexagonal structure, double perovskite). The case studies are presented, focusing on recent progress in a fundamental understanding of the...
Magnetic nanoparticles of magnetite and its substituted variants, including functional derivatives, show promising capabilities in emerging diagnostic imaging methods and novel therapeutic interventions. In addition to the rapid development of synthesis and functionalization methods, a comprehensive understanding of their fundamental physical characteristics and the complex link among...
Superparamagnetic iron oxide nanoparticles (SPIONs), particularly Fe$_3$O$_4$, are among the most extensively studied magnetic nanoparticles (MNPs) due to their high biocompatibility and biodegradability, making them highly suitable for biomedical applications such as magnetic resonance imaging (MRI). While SPIONs have demonstrated promising heating capabilities in magnetic hyperthermia,...
Since the 1930s, magnetism has been classified into two main branches: ferromagnetism and antiferromagnetism. Recently, we have identified a third fundamental branch: altermagnetism (see Figure). Altermagnetism exhibits a compensated d-, g-, or i-wave alternating spin order and is found in a wide range of materials, from metals to insulators [1]. This discovery emerged from our systematic...
A new differential isotropic model of ferromagnetic hysteresis (DIMFH) [1] has been developed, which has removed the contradictions and ambiguities in the original Jiles-Atherton (J-A) model. This model is simpler, uses only 4 parameters ($M_s$, $a$, $h$, $β$) with clear physical meaning and is based on a new assumption: the existence of so-called magnetic clusters - a coherent regions of...
The spin-$1/2$ Ising-Heisenberg model on the extended Lieb lattice in a magnetic field is solved using a combination of analytical and numerical methods. The decoration-iteration transformation [1] maps this model onto a spin-$1/2$ Ising model on the square lattice in an effective field, which can be solved exactly provided that the effective field becomes zero. Classical Monte Carlo...
We investigate a paradigmatic model of a frustrated spin system - the sawtooth chain with magnetoelectric coupling - realized through the Katsura-Nagaosa-Balatsky (KNB) mechanism. While an applied magnetic field influences the spin system via the conventional Zeeman term, the electric field couples to the spins through the KNB mechanism, effectively manifesting as a Dzyaloshinskii-Moriya...
The emerging field of altermagnetism combines the merits of both ferromagnets and antiferromagnets, which, until recently, were thought to be incompatible. Consequently, altermagnets exhibit phenomena unmatched by either of these two traditional magnetic phases [1]. Despite the tremendous interest in this novel magnetic phase, the possible relation of altermagnetism to topology has been...
The Mermin-Wagner theorem states that in a two-dimensional $XY$ (or planar rotator) model with nearest-neighbor interactions the continuous symmetry cannot be broken and thus no standard phase transition can occur. Nevertheless, the model is well known to show a so-called Berezinskii-Kosterlitz-Thouless (BKT) phase transition due to the presence of topological excitations, called vortices and...
The ground-state of the $S =1/2$ Ising 2D Triangular Lattice AntiFerroMagnet (ITLAFM) is the go-to example of a frustrated magnet, and was calculated by Wannier over $70$ years ago [1]. In the absence of strong quantum fluctuations, this ground-state is called a classical spin liquid with a large number of energy-degenerate spin configurations that share the minimum energy. It is expected to...
Magnetic van der Waals materials with very weak exchange interaction between magnetically ordered layers represent an interesting intermediate stage between the more explored cases of isotropic bulk-like exchange and the recently intensively studied ideal $2$D limit (monolayer) [1]. We perform a complex investigation of lattice and magnetic excitations induced by external perturbations...
Quantum Spin Liquid (QSL) is a ground state of condensed matter, which is characterized by the absence of magnetic order down to the lowest temperatures along with long-range entanglement of fluctuating spin excitations [1]. Such a state of matter can be promoted by magnetic frustration which prevents the magnetic moments from antiferromagnetic ordering. There are many lattices created by...
The increasing demand for energy harvesting is associated with the current era of big data, when a problem of power supply of numerous distributed sensors must be addressed. A recent research attention has been paid to ferrofluids in the role of a nanogenerator’s active medium. Efforts have been put in development of ferrofluid-based triboelectric nanogenerators and piezoelectric energy...
Accurate modelling of the magnetic properties of powder samples, particularly molecular nanomagnets, requires careful consideration of magnetic field averaging due to the random orientation of the applied field relative to individual crystallites. In this study, we employ the exact diagonalization method to compute key magnetic properties, such as magnetization and magnetic susceptibility,...
Multifunctional molecular materials based on coordination polynuclear multi-site molecules lie at the heart of materials science in view of growing technological challenges dedicated to the progressive miniaturization process and required high operation speed in information processing, quantum computing, and spintronics. Invariably particular interest in research is focused on molecular...
Cu($tn$)Cl$_2$ ($tn$ = C$_3$H$_{10}$N$_2$) represents a quasi-two-dimensional ($2$D) quantum magnet which preserves $2$D features far below the phase transition to the ordered state at $0.55$ K. The coexistence of $2$D and long-range magnetic correlations can be ascribed to the incommensurate modulated crystal structure. The modulation leads to the formation of extremely thin regions with a...
Nanocrystalline alloys represent an important class of soft magnetic materials. Their technological relevance stems from a combination of high saturation flux density, excellent permeability, and low core loss. Further improvements in magnetic performance can be achieved through careful compositional tuning and advanced processing techniques that optimize phase content and reduce grain...
The straightforward synthesis of inorganic materials, especially in the nanostructured and far-from-equilibrium states, is a great challenge despite promising developments of preparation techniques [1]. The present work provides a brief overview of the mechanochemically synthesized complex oxides. The “green” aspects of mechanochemistry are clearly illustrated by selected examples, where...
The mechanical stress strongly influences the magnetic properties of ferromagnetic materials - the magnetic hysteresis loops measured under constant stress.
In 1930 Kersten analyzed the total energy of a stressed ferromagnet and derived the analytical expression for the relative initial susceptibility that is inversely proportional to the stress for the initial part of the magnetization...
Magnetic nanoparticles have been extensively studied over the past few decades due to their unique magnetic properties, which are strongly influenced by finite size effects and, more prominently, by surface effects resulting from their high surface-to-volume ratio ($R = S/V$). The synthesis of spherical hollow magnetic nanoparticles takes this a step further, significantly enhancing the...
The soft magnetic compacted powdered materials are used in a variety of electromagnetic applications such as electromotors, magnetic circuits of valves, cores for various inductors in computers, relays, disk drives, printers, hearing aid devices and others. These materials are used due to their relatively easy magnetization and demagnetization, maximum permeability, high magnetic saturation...
The asymmetrical GMI ratio dependences of the Co-based microwires recorded during slow magnetization reversal in the longitudinal magnetic field are analyzed in frame of the model of the core-shell domain structure. Considering that Co-based microwire with negative magnetostriction has circularly oriented spontaneous magnetization in the shell, but its narrow core is longitudinally magnetized,...
Nanotechnology in biomedical applications has enabled the creation of novel systems with unique characteristics that combine the properties of biomolecules and iron oxide nanoparticles (IONPs) [1], enhancing treatment effectiveness and reducing costs. IONPs, valued for their specific magnetic properties and low toxicity, offer a promising approach to overcoming challenges in magnetic...
The design of magnetic nanoparticles (MNPs) relies on the precise control of size, shape, and material composition, as these parameters critically influence their properties for applications in technology [1], biomedicine [2], and environmental science. Achieving optimal performance in a specific application requires a deep understanding of how the macroscopic properties of MNPs and their...
Annealing of amorphous alloy Vitroperm-$800$ in the form of thin ribbons under tensile stress is very effective way of achieving huge value of magnetic anisotropy, which may well exceed the value of magneto-crystalline constant ($8$ kJ/m$^3$) of Fe-Si crystalline phase [1]. As a result of such thermo-mechanical treatment ribbons reveal perfectly linear hysteresis loop with constant slope...
Microwire sensing technology offers unique capabilities, including the ability to measure temperature at two distinct points using a single sensor without repositioning. This dual-point measurement is based on domain wall propagation from both ends of the glass-coated microwire, as the switching field value is influenced by the local temperature at the de-pinning centre, where the domain wall...
Superparamagnetic iron oxide nanoparticles (SPIONs), particularly Fe$_3$O$_4$, are among the most extensively studied magnetic nanoparticles (MNPs) due to their high biocompatibility and biodegradability, making them highly suitable for biomedical applications such as magnetic resonance imaging (MRI). While SPIONs have demonstrated promising heating capabilities in magnetic hyperthermia,...
Polymer composites with inorganic fillers are highly valued for their unique properties and applications in areas such as protective systems, permanent magnets, magnetic delivery, microelectronics, and biomedicine. Recent studies suggest that using combined fillers, like nanocarbon and inorganic particles (e.g., magnetic oxides, barium hexaferrite, and other ferrites [1]), is a promising...
Electrical steels are Fe-Si alloys with a silicon content typically ranging from 0 to $6.5$ wt$\%$. They belong to soft magnetic materials and are commonly used as core materials in various electromagnetic applications for generating, distributing, and consuming electrical energy. The thin sheets of these steels are classified into Grain-Oriented (GO) and Non-Oriented (NO) electrical steels....
Finemet-type alloys are very promising materials for the inductive cores of chokes. The functional properties of such materials produced during the recrystallization of amorphous ribbons can be widely modified by the recrystallization parameters. Moreover, due to the small thickness of the nanocrystalline ribbon, the eddy current losses might be controlled by the changes in the effective...
Understanding and controlling the microstructure of soft magnetic nanocrystalline materials is crucial since it strongly influences the material's magnetic properties, such as coercivity, permeability, and saturation magnetization. By meticulously tailoring the grain size and size distribution, one can minimize energy losses, optimize performance, and enhance the material's efficiency in...
Accurate high-temperature measurement is a critical challenge in various industrial applications, including metallurgy, aerospace, and power generation. Traditional thermocouples and resistance temperature detectors (RTDs) suffer from drift, material degradation, and signal loss at extreme temperatures, necessitating alternative solutions for reliable temperature monitoring. In this work, we...
Over the past decade, magnetic nanoparticles (MNPs) have been extensively investigated for their potential application in magnetic particle hyperthermia, a promising strategy in cancer treatment due to its targeted and localized effects [1]. This approach utilizes MNPs as agents that facilitate the conversion of electromagnetic energy from an alternating magnetic field into heat. The...
Fe-based nanocrystalline alloys exhibit distinctive soft magnetic properties, which are obtained through a heat treatment process. This treatment partially devitrifies the amorphous precursor, leading to the development of a microstructure composed of ultra-fine grains, smaller than $30$ nm, embedded within a remaining amorphous matrix [1]. The application of heat treatment combined with...
Soft magnetic composites (SMCs), which have isotropic ferromagnetic behavior, high saturation magnetization, high permeability, and relatively low core loss, have been regarded as key components of electromagnetic systems in higher frequency range [1]. This work focuses on investigating the effect of adding Al$_2$O$_3$ or h-BN as a layer keeping the electric insulation of the NiFe-based SMC...
In recent years, nanoparticles and their applications have attracted significant interest from biomedical researchers. Nanoparticles smaller than $100$ nm exhibit unique properties, including high surface-to-volume ratios, high reactivity, enhanced thermal conductivity, and tunable optical characteristics. These features make them highly useful across various fields, particularly in biomedical...
Soft magnetic materials formed by hot powder powder compaction are a distinct class with significant application potential. They possess exceptional magnetic properties, such as low core losses, high permeability, and $3$-D isotropic magnetic behavior. The shape and size distribution of the powder particles, along with the processing conditions such as compaction temperature and pressure,...
Fe-based alloys, characterized by their unique nanocrystalline structure, exhibit remarkable soft magnetic properties such as high relative permeability ($>10^{5}$), high saturation magnetization ($>1.0$ T), low coercivity and almost zero magnetostriction [1], making them ideal candidates for a wide range of technological applications, such as transformer cores, inductors, and magnetic...
The development of spintronic devices has attracted a lot of interest due to their advantages in electronics, including energy non-volatility, low power consumption and high data processing speed. Currently, a large number of various magnetic materials for spintronics devices have been investigated. Nanofabrication methods provide an opportunity to reduce the dimensionality of such materials...
Cobalt-ferrite (CoFe$_2$O$_4$) nanoparticles (NPs) are valued for their strong magnetism, chemical stability, and mechanical strength, making them useful in multiple fields. In biomedicine, they enable targeted drug delivery, hyperthermia cancer treatment, and MRI contrast enhancement. To employ them in various applications, covering their surface with some specific layer is often inevitable....
Thermoelectric materials are a unique class of materials that enable the conversion of heat (e.g., waste heat) into electric energy, making them crucial for energy harvesting. The most well-known thermoelectric materials are the semiconductors, such as Bi$_2$Te$_3$, widely used for their well-defined thermoelectric properties [1]. However, their preparation is both expensive and...
Magnetic nanoparticles (MNPs) and their unique properties are of intense research interest. These nanoscopic materials exhibit complex magnetic behavior, which is essential in the proposed applications, ranging from spintronics and catalysis to biomedicine, where they found their usage as contrast agents in imaging techniques or innovative cancer treatment (hyperthermia) [1]. This led to a...
Silica (SiO$_2$) hydrogels incorporating magnetic nanoparticles (MNPs) offer a promising platform for advanced materials with applications in biomedicine. This study explores the synthesis, structural characteristics, and magnetic behavior of SiO$_2$ hydrogels functionalized with MNPs, focusing on their tunable properties. The integration of MNPs within the hydrogel matrix enables controllable...
Magnetic core-shell nanoparticles (MNPs) possess specific properties (nanoscale size, disposition of magnetic properties, good biocompatibility) that allow to improve various therapeutic methods or laboratory diagnostic techniques, include the field of separation of biomolecules such as various proteins or DNA/RNA molecules [1]. The specificity of different viral and bacterial diseases limits...
GdMnO$_3$ came to the attention of the scientists due to the discovery of multiferroicity in this compound. It crystallizes in the orthorhombically distorted perovskite structure; space group $Pnma$; Gd ions are located on $4c$; Mn ions on $4b$ and oxygen anions are located on $4c$ and $8d$ crystallographic sites. The compound orders into antiferromagnetic phase below $T_N\sim 40$ K [1] and...
Schwertmannite, a poorly crystalline iron oxyhydroxysulfate, is an iron-bearing mineral that plays a pivotal role in various environmental processes, particularly in the treatment of acidic mine drainage [1]. Due to its ability to adsorb metal ions, anions, and its high surface area-to-volume-ratio, Schwertmannite has drawn significant attention as a potential medium for mitigating...
The design and implementation of a contactless pressure and temperature measurement system for an automotive brake assembly, utilizing glass-coated magnetic microwires, is presented. Amorphous microwires, produced by the Taylor-Ulitovsky method, possess distinctive magnetic characteristics - most notably, magnetic bistability, a pronounced Barkhausen jump, and the influence of pressure on the...
Magnetic mesoporous silica nanoparticles (MSNs) represent a sophisticated category of nanomaterials combining magnetic responsiveness with the versatile drug delivery capabilities of mesoporous silica. Their distinctive structure, characterized by a mesoporous silica shell encapsulating superparamagnetic iron oxide cores, enables efficient drug loading, controlled therapeutic release, and...
Among plenty of examined magnetoimpedance (MI) materials researchers focus on cobalt-based alloys which are very well-known as soft magnetic materials appropriate for sensing elements [1] in cylindrical (wires) or planar (ribbons or thin films) geometries. This paper presents the results of testing the properties of the MI-element of Co$_{72.5}$Si$_{12.5}$B$_{15}$ amorphous wires, with a...
Multiferroic materials with magnetic, ferroelectric and ferroelastic ordering have drawn significant attention because of the fundamental physics as well as their potential applications for future electronic devices. A sample of polycrystalline BaErFeO$_4$ was prepared by conventional solid-state method. It has an orthorhombic crystal structure with $Pnma$ space group and lattice parameters...
Most biological processes take place at the nanoscale, allowing us to understand these processes and create new materials due to technical progress. Magnetic nanomaterials have considerable potential for use in medicine, e.g. in the distribution of the drug to the affected areas, in imaging, and therapy.
In this work, magnetite (Fe$_3$O$_4$) nanoparticles were prepared and functionalized...
The era of Covid-19 reminds us how difficult it is to treat patients with acute respiratory distress syndrome (ARDS) therefore monitoring of the spatial distribution of the directly administrated drug to the lungs is very demanded.
In this work, we focused on the synthesis, functionalization of magnetic nanoparticles, N-acetylcysteine conjugation to magnetic nanoparticles and the study of...
Intensive studies on the magnetic and magneto-transport properties of ferromagnetic metal-insulator granular thin films and discontinuous metal-insulator multilayers have been mainly driven by improved parameters compared to GMR structures. At the same time, the issue of the electrophysical properties of composite materials, which differ significantly from those of bulk metal samples and bulk...
Magnetic hybrid nano-architectures, which combine materials with distinct magnetic properties at the nanoscale, enable the development of advanced materials with novel functionalities arising from interface interactions [1]. In this context, exchange-coupled hard/soft nano-heterostructures, combining ferro(i)magnetic phases with high magnetic anisotropy and high magnetization, have garnered...
The domain structure of amorphous ferromagnetic microwires with positive magnetostriction is formed during production with the Taylor-Ulitovsky method of rapid quenching. The stress distribution results in a large axial domain along the microwire, in which the magnetization takes only two opposite states. There are closure domain structures to minimize magnetostatic energy at the ends of the...
Multiferroic NdMnO$_{3+\delta}$ belongs to the family of RMnO$_3$ (R= rare earth) perovskite and exhibits several fascinating properties, including negative magnetization, magnetocaloric effect (MCE), magnetic anisotropy, and spin reorientation (SR) within the Mn sublattice. Materials with a large MCE are highly desirable for magnetic refrigeration technologies, which provide an...
Magnetic refrigeration is an innovative, eco-friendly cooling technology that offers greater efficiency compared to conventional methods. One of its key advantages is the scalability of magnetocaloric materials for various applications. However, reducing the size of the cooling system naturally diminishes its cooling power, which can be compensated by employing higher magnetic field changes....
Magnetic nanoparticles (MNPs) are a popular choice for biomedicine due to their intrinsic magnetic properties. To fully utilize their potential, surface modification is essential to ensure their hydrophilicity, biocompatibility, and stability in a physiological environment.
This study focuses on the preparation and characterization of MNPs modified with polyvinyl alcohol (PVA). The MNPs...
Amino modified (proline, tryptophan and poly-L-lysine) magnetic nanoparticles were used to design potential theranostic agents for cancer diagnosis and for combined radionuclide and hyperthermia therapy [1]. Detailed characterization of prepared MNPs was performed using of various techniques, such as dynamic light scattering, electron microscopy, magnetization measurements or thermogravimetric...
Soft magnetic materials are an integral part of modern technology, especially in areas such as energy, electrical engineering, automotive and renewable energy. Their properties, such as low hysteretic losses, low coercivity, high relative permeability and low magnetostriction, are crucial for the efficient operation of devices such as transformers, electric motors and inductors. However, the...
Nanocrystalline soft magnetic FeCo-based alloys have gained attention in the last decades and recently also in the development of electric motors due to their excellent magnetic properties thanks to their fine microstructure, being composed of bcc-FeCo nanograins surrounded by metalloid-enriched amorphous matrix. FeCoB alloys with high saturation magnetization, low coercivity, high...
Ni-Mn-Ga alloy is the most promising candidate as material for magnetic shape memory applications. In addition to austenite, it is also found in variety of martensite phases. Antiphase boundaries (APBs) are planar defects that play a critical role in strengthening Ni-based alloys, and their sensitivity to alloy composition offers a flexible tuning parameter for alloy design.
We combine...
Fe-based metallic glasses (MGs) exhibit superior soft magnetic properties such as a very low coercivity and power losses, a low magnetostriction and a high permeability [1]. Their magnetic properties can be further optimized by modification of post-processing conditions, such as temperature and duration of heat treatment. Structural characterization of MGs at the atomic level represents an...
This study investigates the switching field fluctuations [1] of head-to-head and tail-to-tail domain walls in amorphous microwires under mechanical stress. Using $7$ cm long samples and analyzing experimental data from $2000$ magnetization cycles, our methodology yields separate switching field distributions for the two domain wall configurations. The experimental results reveal that the...
Thin magnetic microwires are characterized by peculiar fast domain wall motion. Recently, it was shown that the combination of the high speed of the domain wall and a very small misalignment of the surface magnetization leads to the remarkable Domain Wall Matteucci Effect (DWME). This effect stems from a very small component of the circular magnetization that gives rise to the electrical...
High-permeability ferrite cores are essential components in various electronic applications, particularly in inductors for power electronics and filtering circuits. Accurate simulation of these components is crucial for reliable design, but traditional SPICE models often struggle to capture the temperature-dependent behavior of ferrites. This work introduces an enhanced gyrator-capacitor model...
Contactless sensors are often preferred in applications where physical manipulation with the sensor is not possible or where direct contact could affect the measurements. Microwires can serve as passive sensors which respond to changes in the environment (e.g., magnetic field, temperature) without the need to physically connect them to the measured object. These microwires can be presented as...
Ni$^{2+}$-doped calcium-aluminosilicate glasses with gehlenite ($2$CaO-Al$_2$O$_3$-SiO$_2$) composition were prepared with different content of Ni$^{2+}$ ($0.1$, $1.0$, and $3.0$ mol. $\%$). The glasses were prepared by combining solid-state synthesis and conventional melt quenching. The prepared system was studied using X-ray diffraction analysis, differential thermal analysis, and a SQUID...
Topological materials have attracted significant interest in condensed matter physics for their unique topological properties leading to potential technological applications. Topological nodal line semimetals, a subclass of topological materials, exhibit symmetry-protected nodal lines, where band crossings occur along closed curves in the three-dimensional Brillouin zone. When the nodal lines...
It is with great pleasure that the organizing committee of the CSMAG'25 invites you to a special evening of music. Come and unwind, connect with fellow attendees, and immerse yourself in a wonderful performance that will enrich the spirit of our gathering.
The concert will take place on Tuesday, July 8, 2025 at 19:00 as part of an event combined with dinner.
Zuzana Oráčová...
In recent years we have shown, that molecular Lanthanide-based coordination complexes hold potential for use as physical supports for the implementation of single- and entangled-qubit quantum gates in Quantum Information Technology devices [1,2]. The coupled electronic qubit-nuclear qudit nature of this system allowed to propose a scheme for intrinsic implementation of efficient quantum error...
Triangular-lattice antiferromagnets (TLAFs) provide a versatile platform for exploring frustrated magnetism, where geometric constraints inhibit conventional long-range order and foster exotic quantum states [1]. In these systems, the interplay between spin–orbit coupling and crystal electric field effects induces markedly different behaviors between Kramers and non-Kramers ions; Kramers ions...
EuZn$_{2}$P$_{2}$ is a narrow-gap semiconductor (0.11 eV) belonging to the Zintl phase family, characterized by mixed ionic and covalent bonding. Although long-range antiferromagnetic order is established only below $23$ K, strong short-range magnetic correlations significantly reduce electrical resistivity well above the ordering temperature, leading to a giant magnetoresistance...
Recently, a large number of hard disc drives have been decommissioned due to wear and their replacement with more efficient and reliable solid-state drives. However, before the decommissioning, the data stored on the HDD should be erased. This process is typically carried out through degaussing. However, the aluminium-steel casing of HDDs significantly attenuates magnetic flux density....
The search for room temperature superconductivity has accelerated dramatically in the last few years, driven largely by theoretical predictions that first indicated alloying dense hydrogen with other elements could produce conventional phonon-mediated superconductivity at very high temperatures and at accessible pressures. More recently, the success of structure search methods have...
In a series of papers Hirsch argues that the established theory of superconductivity describes neither the dynamics nor the thermodynamics of the Meissner effect in a type-I superconductor, if the magnetic field is switched on before the metal is cooled into the superconducting state. He finds that similar problems appear also when dealing with the process of magnetic field generation in...
Spin-valley locking allowing for in-plane upper critical magnetic fields vastly surpassing Pauli limit was first demonstrated in fully two-dimensional monolayers like of NbSe$_2$ [1] with large spin-orbit coupling and broken inversion symmetry. Surprisingly, this Ising superconductivity can be present in layered bulk materials, too. We have clarified the underlying microscopic mechanism of...
High Entropy Alloys (HEAs) are solid solutions of five or more elements mixed in non-negligible proportions. Their unique and very promising physical properties have attracted much attention since their discovery in $2004$. HEAs form well-defined, close-packed structures (BCC, FCC, HCP). Due to their structural features, HEAs are known for exceptional mechanical properties, thermal stability,...
This work describes the basic properties of MgB$_2$ ($2001$) and iron pnictide superconductors ($2008$) discovered in the third millennia. Magnetic and transport $J_c(B)$ and $R(T)$ measurements of superconducting wires made of these two materials have been done at low temperatures and external magnetic fields up to $12$ T [1-3]. While MgB$_2$ wires show promising behaviour for the windings...
Nowadays superconducting radio frequency (SRF) cavities represent fundamental tools used for (Standard Model) particle acceleration, (beyond Standard Model) particle probing, and long-lifetime photon preservation. We study their Quality factor properties mainly at low temperatures within the Dynes superconductor model [1]. We scrutinize and use the local limit response to the external...
The aim of this talk is to explaine role of main stakeholders preparing policy of Ministy of Education, Ressearch, Development and Youth of the Slovak Republic during the process of establishing SK Infrastructure Roadmap. One of the planned measures is establishing of the **National Contact Point for XFEL and other European Research Infrastructures (hereinafter referred to as the NCP XFEL) ...
The Spectroscopy and Coherent Scattering (SCS) Instrument of the European X-ray Free Electron Laser (European XFEL) offers a wide range of measurement techniques and sample environments for ultrafast studies in solids and liquids. In this talk I will introduce the instrument and its capabilities with an emphasis on applications in magnetism.
The soft X-ray branch of the European XFEL...
In this contribution we introduce a novel approach for fabrication of magneto-resistive multilayer nanowires and present their spin structure determination using synchrotron radiation.
Complex nano-structuring routines on magnetic multilayers are frequently applied in data storage and sensor technology to functionalize devices via shape anisotropy. Here we test, if sputter deposition onto...
At a fundamental level, the altermagnetic phase manifests as collinear magnetism characterized by zero net magnetization, highlighting a distinct spin symmetry that emerges from the decoupling of spin and crystal space symmetries. MnTe exemplifies such a material, and Spin- and Angle-Resolved Photoemision Spectroscopy (SARPES) has proven to be an effective method for investigating its...
The interplay between spin-orbit interaction (SOI) and magnetic order is currently one of the most active research fields in condensed matter physics. Famous examples of this interplay are skyrmions and spin waves, but also the unique properties of altermagnets, the search for Majorana zero modes, and magnetic topological insulators fit directly in this field and have gained much attention in...
The beamline for advanced dichroism experiments (BLADE) is a soft x-ray beamline at the UK synchrotron facility Diamond light source. It delivers soft x-ray beam in the energy range from $0.4$ to $1.6$ keV. This energy range is optimized for the dipolar transitions of 3$d$ transition metals ($L_2,_3$ edges) and rare earth elements ($M_4,_5$ edges). So the absorption effect benefits from a...
The I12-JEEP beamline as a part of the national UK synchrotron facility Diamond Light Source (DLS) represents a versatile instrument combining high-energy ($53 – 150$ keV) X-ray scattering and imaging techniques used in the structural characterization of metallic and non-metallic materials, chemical products, geological, biological, archaeological, and palaeontological samples [1, 2]. The...
The neutron and, more recently, X-ray spectroscopy have been standard workhorses for investigations of condensed matter dynamics at atomic resolution. Nevertheless, the inherently weak interaction of both probes with matter, accompanied by the tiny flux densities of neutron beams and by the huge Xray photon energy as compared to the energy scale of elementary excitations in condensed matter,...
A dynamic panel discussion will be hosted as part of the satellite meeting, Magnetic Materials in the Light of Photons, Neutrons, and FELs. Cutting-edge advances in magnetism research will be explored by leading experts, and groundbreaking studies alongside the transformative role of large-scale facilities, such as neutron sources, synchrotrons, and free-electron lasers, will be highlighted....
Miki Knižka, mountian guide IFMGA / UIAGM
Founder of Mountain Pro Guiding. Adventurer, skier, alpinist… over 10 years of exploring in Canada, ascents to many peaks of South and North America, and various ski touring adventures around the world and in our High Tatras.
The Beginnings - Mountain Sherpa
He was born and grew up under the High Tatras, so he has always been very...
Soft magnetic materials play a crucial role in modern energy applications, enabling higher efficiency, reduced energy losses, and improved performance in electrical devices. Discussion about their fundamental properties, material advancements, and technological innovations, emphasizing their importance in motors, transformers, chokes, and other energy-related applications will be made.
A...
Wide variety of soft magnetic materials find application as functional materials in magnetic sensors. The requirements for their properties vary, but low coercivity is always expected. Some sensors require high permeability, the others high linearity. Both alloys with small and large magnetostriction, and small and large saturation flux density are required. We will show several sensors...
The origin of magnetocrystalline anisotropic energy (MAE) guided by spin-orbit coupling in the L1$_0$-FePt alloy was analyzed and the correlations among MAE and magnetoelastic (magnetostriction) constants $b^{\prime}𝑠$($\lambda^{\prime}𝑠$) by means of the electronic structure eigenvalues (orbital energies) and eigenfunctions (orbital occupancies) were established [1]. Our numerical analysis...
The aim of present work was to study the phase composition, microstructure and magnetocaloric effect of binary Gd-Pb alloys. Samples were prepared by arc-melting of high purity constituent elements. The XRD studies were carried out using a Bruker D8 Advance diffractometer with Cu-K$\alpha$ radiation and semiconductor detector Lynx Eye. The microstucture and chemical composition of the samples...
Magnetic order in gapped quantum antiferromagnets can be induced either by magnetic field or pressure. Such transitions are characterized by $z = 2$ or $z = 1$ dynamical critical exponents, determined by the quadratic or linear low-energy dispersion of their spin excitations, respectively. While the field-induced transitions (with the most common realization known as the Bose-Einstein...
We study the spin-$1/2$ Heisenberg antiferromagnet on a diamond-decorated honeycomb lattice and uncover a parameter regime in which the ground state corresponds to a dimer-tetramer crystal. In this regime, low-energy excitations are captured by an effective hard-dimer model on the honeycomb lattice with anisotropic activities. This effective model exhibits thermodynamic behavior consistent...
Recent scientific and technological efforts have increasingly focused on developing novel multifunctional materials whose properties can be dynamically tuned by external stimuli such as light, pressure, and electric or magnetic fields. Among these, organic-inorganic hybrid structures synthesized via simple wet-chemistry processes have emerged as promising candidates. Notably, materials...
Several conflicting predictions have been made for the symmetry of the pairing in transition metal dichalcogenide (TMD) superconductors. An indication of whether singlet or triplet pairing is present can be given by the upper critical field ($H_{c}$), the magnetic field required to fully supress superconductivity. Monolayer 1H-NbSe$_{2}$ and 1H-TaS$_{2}$ have extremely large critical fields,...
Non-centrosymmetric superconducting materials represent an exciting class of novel superconductors featuring a variety of unconventional properties, including mixed-parity pairing and very high upper critical fields. Here, we present a comprehensive study of TaIr$_2$B$_2$ (with $T_c = 5.1$ K), using a set of complementary experimental methods, including bulk- and surface-sensitive techniques....
Artificial magnetoelectric multiferroic heterostructures, which combine multiple ferroic orders, have high potential for next-generation electronic devices. With device downscaling, the interface plays an increasingly important role and deserves special consideration. Oxide films are especially well suited for such applications. We combined Co [1] and Ni [2] ferrite layers, which bring their...
In my presentation I will review the latest progress in understanding elastomagnetic multiferroic behavior of Ni-Mn-Ga Heusler alloys called magnetic shape memory effects [1]. These phenomena are underlined by displacive and diffusionless phase transformation from cubic to lower symmetry phase called martensitic transformation. Apart from temperature the transformation can be induced by...
Chemical modifications in the iron site of BiFeO$_3$ represent the direct approach to tune the magnetic behaviour of this material. However, using the conventional synthesis routes, it is possible to achieve the substitution rates of a few atomic percent only. Most of the reported single-phase BiFe$_{1−y}$B$^{3+}_{y}$O$_3$ perovskite compositions with $y > 0.1$ were prepared via high-pressure...
Ferromagnetic resonance (FMR) is a unique technique used to determine fundamental properties of the studied magnetic material, such as magnetocrystalline anisotropy, $g$-factor, exchange constant, Gilbert damping, etc. in single crystals (SCs) or magnetic interactions between layers and components in multilayered nanostructured films and foils [1]. Ni-Mn-Ga Heusler alloys are a subclass of...
The A$_4$M$_2$O$_9$ family (A = divalent cations; M = Nb/Ta), which typically adopts a trigonal P$\overline{3}c$1 structure derived from corundum, exhibits magnetoelectric (ME) properties in antiferromagnetic compounds such as Co$_4$Nb$_2$O$_9$. Ni$_4$Nb$_2$O$_9$ stands out as an exception, crystallizing in a different but close structure described in the orthorhombic $Pbcn$ space group that...
The industrial production of advanced Mn-Zn ferrites often faces unique challenges that determine its upscaling success. These range from controlling fundamental properties such as thermal expansion to meeting broader goals of innovation and sustainability. The present work aims to address key material design challenges and strategic development approaches to these goals.
One of the...
Many technological applications require low permeability of a few hundreds being constant over a wide magnetic field range. For example, this is a case of magnetic energy storage cores [1]. It is well known that magnetic anisotropy induced by stress applied during annealing can reach magnitudes up to several thousands of J/m$^3$ which is about two orders of magnitude larger than the magnetic...
Metallic glasses (MGs) are promising materials for radiation-resistant applications due to their disordered atomic structure and excellent magnetic properties. This study examines the effects of neutron irradiation (fluence up to $3\times10^{16}$ $cm^{−2}$) on Fe-based metallic glasses using Mössbauer spectroscopy (MS) and X-ray diffraction (XRD).
XRD analysis, particularly total scattering...
Magnetic bistable microwires represent a highly promising technology in the field of sensor and actuator electronic systems. Their unique properties are well known within the scientific community as well as in practical applications and have been widely discussed. Microwires with an amorphous structure exhibit not only a high magnetoimpedance response but also the ability to detect extremely...
Structural, static and dynamic magnetic properties of title complex {[Ce$_2$($o$PDA)$_3$(H$_2$O)$_2$]$\cdot 2$H$_2$O}$_n$ containing O-donor ligand H$_{2o}$PDA ($o$-phenylenediacetic acid) are reported. The structure of the studied compound is formed by chains of the Ce$^{3+}$ ions linked via $o$PDA$^{2-}$ dianions which act as pentadentate ligands with bridging and chelating functions. The...
Mixing powder materials with distinct properties is a well-established approach to overcoming the limitations of individual powders. In soft magnetic systems, this strategy enhances the compressibility of high-performance but brittle materials, such as FeSi [1], FeSiB [2], and FeSiBCCr [3]. FeSi with $>3$ wt.$\%$ Si is typically mixed with epoxy binders, restricting high-temperature processing...
The metallic tetraboride TmB$_4$ is one of the best-known representatives of Shastry-Sutherland lattice (SSL), which is a two-dimensional geometrically frustrated lattice [1]. The long-range Ruderman-Kittel-Kasuya-Yosida (RKKY) exchange interaction between magnetic moments leads to antiferromagnetic (AF) ordering of dimers. Crystal field effect at Tm$^{3+}$ ion sites leads to strong Ising...
Bulk single crystals of EuBCO superconductors with different Eu$211$ phase contents were prepared. Higher growth rates in the growth temperature window than usual were used to grow bulk EuBCO crystals, and the Eu$211$ phase content in the samples was varied from $21.7$ to $32.2$ wt.$\%$.
Measurements of local superconducting properties (transition temperature, critical current density at...
In the last two decades, the stochastic motion of charged particles in external magnetic fields has attracted considerable attention, mainly due to the necessity of taking into account memory effects in particle dynamics. The problem considered in this contribution is closely related to the Bohr-van Leeuwen theorem, which governs the response of equilibrium systems to external magnetic fields....
The effect of uniaxial single-ion anisotropy on quantum entanglement is rigorously quantified using negativity in a mixed spin-($1$,$1/2$,$1$) Heisenberg trimer accounting for different exchange coupling constants between identical and distinct spins. Bipartite negativities between the single spin entity and the remaining spin dimer are analyzed alongside with the global tripartite negativity...
The rare earth boride HoB$_{12}$ crystallizes in the fcc structure and shows antiferromagntic order at $T_N = 7.4$ K. The ordering is described by an incommensurate ordering vector $Q_{af}$ = ($0.47,0.47,0.47$) [1]. In a magnetic field HoB$_{12}$ shows a complex phase diagram where nine different magnetic phases can be distinguished [2].
Here the phase diagram is discussed in the light of...
In the Eu–Pd–Sn system some novel compounds have been discovered, showing a stable Eu$^{2+}$ magnetic state and complex magnetic structures, e.g. EuPdSn$_2$, Eu$_2$Pd$_2$Sn and EuPd$_2$Sn$_4$ [1–5]. The scenarios of complex and anisotropic magnetism are not expected for Eu$^{2+}$ because of its spin $S=7/2$ and orbital $L = 0$ numbers precluding the presence of crystal electric field effects....
Cu(tn)Cl$_2$ (tn = 1,3-diaminopropane) has been previously identified as a potential realization of a quasi-two-dimensional, spatially anisotropic triangular Heisenberg antiferromagnet with spin $1/2$, intralayer exchange coupling, $J/k_B \approx -3$ K, and interlayer exchange coupling, $J^{\prime} \approx 0.001\,J$. These studies indicated a field-induced anomaly forming below $1$ K in...
One of the most characteristic features of altermagnets is their non-relativistic alternating spin-split band structures. Though these bands give rise to previously unexpected behavior in altermagnets of a certain symmetry, such as spin-polarized currents, it is the relativistic spin-orbit coupled bands that are the origin of many of the other T-reversal symmetry breaking phenomena of...
The aim of our work is to extract the density of states (DOS) and the gap function from the tunneling conductance data at higher temperatures. It is known that if the temperature approaches zero, the DOS function is proportional to the tunneling conductance, and therefore, it can be easily extracted. However, with increasing temperature, the temperature smearing causes that this approximation...
Molecular magnets [1] with quantum correlations offer exciting possibilities for applications in demagnetization processes, as well as rapid cooling and heating [2]. This rapidly growing field presents diverse opportunities that leverage the unique properties of molecular magnets, bridging multiple scientific disciplines. In this work, we investigate the low-temperature thermodynamic...
CrSBr is an air-stable van der Waals antiferromagnet with high Néel temperature. We calculated the spin-wave spectrum for magnetization polarized along the three principal crystallographic axes of spin-wave wave guides based on a monolayer of CrSBr, which is the building block of bulk CrSBr, by considering the various magnetic interactions present in CrSBr, including the ferromagnetic exchange...
This study examines the nanoindentation behavior of polycrystalline hafnium carbide (HfC) and tantalum carbide (TaC) ceramics and validates the results through finite element (FE) simulation. The ceramics were synthesized via ball milling and a two-step Spark Plasma Sintering (SPS) process, producing uniform, single-phase samples. Electron backscatter diffraction (EBSD) was used to study...
In recent years, multinary chalcogenides have received significant attention as potential energy materials. In their synthesis, mechanochemistry seems to be an effective method for the preparation of various chalcogenide - based nanoscale materials. Due to the creation of structural disorder, defects and nanostructuring in solids via high-energy milling, unique properties can be achieved [1]....
Application of external pressure, hydrostatic or uniaxial, is an appropriate way to change (tune) the properties of quantum magnets with geometrical frustration as it can modify the distances between atoms or layers, or change the angles in frustrated triangles [1-3]. In this contribution we present the influence of hydrostatic and uniaxial pressure on the magnetically strongly anisotropic...
Zeolitic imidazolate frameworks (ZIFs) represent kind of porous metal−organic frameworks (MOFs) in which all tetrahedrally coordinated atoms are transition metals, and all bridging ones are imidazolate (Im) units. In Co(mIm)$_{2}$ (ZIF-$67$) and Zn(mIm)$_{2}$ (ZIF-$8$) where HmIm = $2$-methylimidazole (C$_{4}$H$_{6}$N$_2$), the structures are based on nets of linked CoN$_4$ or ZnN$_4$...
In recent years, lanthanide-based metal-organic frameworks (Ln-MOFs) have been gaining increasing attention due to their unique physicochemical properties and broad application potential. Ln-MOF materials are porous coordination polymers composed of lanthanide cations linked by organic ligands through coordination bonds [1]. Due to their partially filled $4f$ orbitals, lanthanides exhibit a...
Modern times and the associated rapid expansion of science and technology emphasize the need for new materials. This work deals with the analysis of the results of selected types of measurements, which can be used to determine the structural and magnetic properties of nickel-zinc ferrites with spinel structure. These are soft magnetic materials that have extensive use in various applications...
This study demonstrates the localized creation of skyrmions (SKs) in the two-dimensional ($2$D) ferromagnetic material Fe$_3$GaTe$_2$ using conductive atomic force microscopy (cAFM). By applying bias voltage through the cAFM tip, sufficient current is generated to induce localized Joule heating, transforming random stripe domains into bubble domains. SKs were successfully induced under ambient...
Previous single crystal studies of Cu(en)$_2$SO$_4$ (en = C$_2$H$_8$N$_2$) indicated the absence of phase transition to magnetic ordered state down to $0.3$ K [1]. Exponential decrease of specific heat at lowest temperatures indicated the presence of energy gap in the excitation spectrum. Detailed inspection of the crystal structure considering local symmetry of crystal field and spatial...
Electrodeposition is an electrochemical technique used to synthesize nanostructured materials. By manipulating the experimental conditions (potential, current density, electrolyte composition, temperature, external magnetic field, etc.) it is possible to control the nucleation, growth, and assembly of the deposited material. This allows for fabrication of nanostructures with tailored...
The use of additive techniques to shape polymer-bonded composites has become popular. Mixing the polymer with the metal powder makes it possible to obtain various new materials with different properties. One possible solution is to make composites based on magnetic powders in a low-density polyethylene (LDPE) matrix. Mixing process results in a bonded magnetic material with reduced magnetic...
Spin-$1/2$ copper (II)-based metal-organic compounds are known and extensively investigated examples of low-dimensional magnetic systems, where quantum fluctuations and particular coordination of the Cu$^{2+}$ ions determine their magnetic properties. In our study, we focused on an experimental study of system, Cu($en$)($sal$)Cl ($en=$ethylenediamine; $sal=$ salicylic acid). The structure...
Magneto-structural correlations in a series of heterometallic isostructural cubane-type complexes with {Ni$_{2}$M$_{2}$($\mu_{3}$-O)$_{4}$} (M = Mn, Co) core: [Ni$_{2}$Mn$_{2}$(L)$_{2}$(OAc)$_{2}${N(CN)$_{2}$}]$\cdot 5$H$_{2}$O, [Ni$_{2}$Mn$_{2}$(L)$_{2}$(OAc)$_{2}$(N$_3$)$_{2}$]$\cdot$MeCN, [Ni$_{2}$Mn$_{2}$(L)$_{2}$(OAc)$_{2}$(NCS)$_{2}$]$\cdot$H$_{2}$O, and...
The magnetic properties of rare-earth ions are mainly studied in the periodic and symmetrical crystal structures. The influence of the crystal-electric field (CEF), which surrounds the magnetic ions in such cases, is mainly identical for every magnetic ion.
We performed the experimental study of the magnetic properties of the Dy$_x$Y$_{1-x}$(PO$_3$)$_3$ glassy system with several...
Applying a magnetic field to an antiferromagnet can cause abrupt changes to its magnetic state. A metamagnetic transition to a paramagnetic state is accomplished in sufficiently high magnetic fields. This transition is usually of a second-order type. However, a first-order transition is observed at low temperatures well below the Néel temperature in some cases. The antiferromagnet - paramagnet...
Iron garnets, particularly yttrium iron garnet (YIG) and doped variants, are crucial materials for spintronic applications due to their exceptionally low damping ($\alpha \approx 10^{-5}$), high spin-wave propagation lengths, and tunable magnetic properties [1]. Understanding their magnetization dynamics in thin-film and heterostructure configurations is essential for advancing their...
Van der Waals (vdW) materials and their heterostructures exhibit remarkable electronic and optical properties that can be finely tuned using external physical fields such as photonic, magnetic, electric, and strain, or through proximity effects with other materials and molecules. These attributes position them as superior building blocks for cutting-edge optoelectronic and spintronic...
Altermagnets attract ongoing interest because of their unexpected electronic properties, such as spin splitting of electron bands or various transport properties (anomalous and spin Hall effects). Besides the electronic properties, based on elementary excitations that can be classified using the electron spin as a good quantum number, attention has recently been paid to magnons, where such...
We investigate the antiferromagnetic spin-1 Heisenberg diamond chain [1] in an external magnetic field using a combination of analytical and numerical techniques, including the theory of localized magnons, variational methods, exact diagonalization, and the density matrix renormalization group (DMRG). Our primary focus lies in understanding the magnetization process and magnetocaloric response...
The Bohr-van Leeuwen theorem stating the absence of classical magnetization in equilibrium, a fundamental result in the field of magnetic phenomena, was originally proved for an electron gas. In the present contribution, we raise the question of whether this theorem applies to systems of particles undergoing a non-Markovian Brownian motion among other particles in a static magnetic field. We...
Polarization-sensitive photodetectors have attracted increasing research interest due to many important applications like high-density optical signal processing, imaging, navigation, or high-contrast polarizers. Here we demonstrate a self-powered photodetector with the assistance of the lateral photovoltaic effect resulting from the formation of Schottky junctions in the semiconducting CrSBr...
This study rigorously investigates the effects of temperature and magnetic field on the dynamical autocorrelations and correlation functions of the spin-$1/2$ Heisenberg tetrahedron. The exact results for the dynamical autocorrelations and correlation functions are subsequently used to compute the static and dynamic structure factors of the spin-$1/2$ Heisenberg tetrahedron, which can be...
The total energy of real magnetic materials always includes, in addition to magnetic energy, the static lattice energy and the energy of thermal atomic vibrations. Despite this, most of the theoretical work on magnetic systems considers only the magnetic energy, completely ignoring lattice energy contributions. To clarify the influence of lattice energy on the magnetic properties of localized...
Spin-$1/2$ molecules on superconductors represent a promising platform for advanced quantum devices. Recent experiments have shown that the ground-state phase and subgap states of molecular-superconductor hybrids, such as TBTAP [1] can be effectively tuned. A quantum phase transition can be induced by changing the distance between the STM tip and the molecule, or by adding another molecule and...
Metallophthalocyanines (MPcs), planar aromatic macrocycles with transition metals such as Fe and Cu at their core, exhibit versatile electronic and magnetic properties, making them ideal candidates for applications in molecular spintronic, magnetic storage, and quantum computing [1].
The previous magnetic study of CuPc and FePc grafted on high-density polyethylene (HDPE) was done using the...
Titanium-based alloys have long been used for biomedical implants due to their biocompatibility, mechanical properties, and high corrosion resistance in body fluids. Moreover, their chemical composition and surface treatments can be tailored to enhance their performance. Electrochemical anodic oxidation (AO) is a promising method for improving implant integration with surrounding tissues and...
In our systematic exploration of the Eu-Pd-Sn ternary system, we have identified several new compounds, such as Eu$_2$Pd$_2$Sn, EuPd$_2$Sn$_4$, and EuPdSn$_2$. These Eu-based compounds often show a complex magnetic behavior. This behavior is unexpected since the intermetallics based on Eu$^{2+}$ (electron configuration 4f$^{7}$ and $^8$S$_{7/2}$ ground state) represent a pure spin system with...
High-entropy alloys (HEAs) consist of several (typically $5$ or more) different types of randomly mixed constituent atoms displaying a high degree of disorder and thus high configurational entropy. Our recent research shown that main factors that influence their superconducting properties include crystal structure, valence electron count (VEC) and mixing entropy [1-3]. Thanks to possibility to...
GdBCO bulk superconductors possess unique superconducting properties, making them highly attractive for various practical applications [1]. They are typically prepared using the top-seeded melt growth (TSMG) process [2], in which a single-crystal seed is placed at the centre of the top surface of the pellet. Recently, a new method – single-direction melt growth (SDMG) – has been introduced...
Superconductivity in high and medium entropy alloys (HEAs and MEAs) have been the subject of considerable interest in the recent period (see e.g. [1 - 3]). Very recently, also the HEA nitrides and carbonitrides have attracted attention due to their transition temperature ($T_c$) enhancement [4] and observation of unconventional superconductivity [5].
In this work we present results of the...
Static and dynamic magnetic properties, electron-spin resonance spectra together with calculation of low-energy vibrational modes for complex [Gd(H$_2$O)$_6$Cl$_2$]Cl are presented. The studied compound can be identified as $S = 7/2$ Heisenberg magnet with easy-axis anisotropy $D/k_B \approx - 50$ mK and dipolar magnetic coupling of nominal size $\left| J/k_B \right| \approx 12$ mK. The...
Incorporating magnetoelastic coupling into one-dimensional spin models makes them more realistic and can introduce novel physical phenomena. We investigate the deformable quantum spin-$1/2$ XX chain in a transverse magnetic field, which is exactly solvable within a combination of Jordan-Wigner and Fourier transformations. Lattice deformations are introduced into this quantum spin-chain model...
Non-centrosymmetric superconducting materials represent a class of materials with existing unconventional properties. Thanks to the broken inversion symmetry these materials can exhibit properties such as mixed-parity pairing and very high upper critical magnetic field. Point-Contact Andreev reflection spectroscopy can be a great technique for studying these phenomena. Point-contact...
Magnetic, thermodynamic, and magnetocaloric properties of the spin-$1/2$ quantum Heisenberg octahedral chain with three distinct exchange interactions in an external magnetic field are investigated. The exact results derived for the one-magnon energy spectrum suggest the existence of three flat bands among five one-magnon energy bands, which allow the application of the theory of localized...
The development of a comprehensive theory capable of fully describing high-temperature superconductors (HTSCs) remains one of the most challenging problems in modern solid-state physics. HTSCs with a superconducting (SC) transition temperature $T_c$ exceeding the boiling point of liquid nitrogen include a well-known class of metal oxides with an active CuO$_{2}$ plane such as...
Altermagnets are a recently identified class of magnetic materials that, like antiferromagnets, exhibit zero net magnetization but display spin-split electronic bands in certain regions of the Brillouin zone [1]. Unlike conventional antiferromagnets, altermagnets can support spin-polarized currents, making them a unique hybrid between antiferromagnets and ferromagnets. This duality provides...
Let us introduce ourselves to you in our current grouping. We, the members of FSk
Skadzi Stadzi, were in different periods of our lives part of the dance and singing component of FS Jánošík - Svit, FS Vagonár Stará škola, FSk Batizovce, folklore singing groups Východňarské Šarkanice, Jaščurečky and Slovenka Poprad. In September 2023 we separated into an independent artistic ensemble and we...
Generation and manipulation of propagating spin waves (PSWs) in magnetic multilayer systems have opened new frontiers for magnonics and spin-wave-based computing [1]. The precise control of frequency and phase of PSWs in nanoscopic CMOS compatible systems is of high importance for emerging applications such as reservoir computing and Ising machines [1,2,3]. Recently, spin-orbit torques have...
Two-dimensional ($2$D) magnets have emerged as a promising platform for both fundamental studies of low-dimensional magnetism and the development of next-generation spintronic devices. However, intrinsic $2$D magnetic materials often suffer from low Curie temperatures, environmental instability, and limited tunability, posing significant challenges for practical device integration. To overcome...
The integration of two-dimensional ($2$D) materials into spintronic devices has long promised revolutionary improvements in performance and energy efficiency, yet progress has been hampered by interface contamination, oxidation-induced magnetic pinning, and compromised transmission at the $2$D/ferromagnetic (FM) junction. In our work, we introduce an advanced, single-step deposition process...
The family of $A^\prime A^{\prime\prime}B_2$F$_7$ pyrochlore fluoride antiferromagnets represents a unique but understudied class of materials containing the three-dimensional frustrated network of corner-sharing tetrahedra. While the rare-earth-based $A_2B_2$O$_7$ pyrochlore oxide counterparts have long been the main focus of study for their exotic magnetic ground states (spin glass, spin...
Magnetocaloric cooling is being widely studied for its multifaceted applications such as magnetic refrigeration, liquefaction of gases, hyperthermia, etc. Magnetocaloric effect (MCE) involves the cooling/heating of a magnetic material under adiabatic magnetic field change. Rare-earth-based materials exhibit large MCE due to their inherently large magnetic moment but are not sustainable....
Quantum materials exhibit a complex interplay between electronic correlations, topology, and magnetism, placing them at the forefront of condensed matter physics and quantum technology. Understanding these systems requires disentangling spin-orbit coupling, electron-electron interactions, and magnetic fluctuations under realistic conditions, including finite temperatures and structural...
The aim of the study was to characterize, using Mössbauer spectrometry and magnetic analysis, the technogenic magnetic particles (TMPs) from non-ferrous metallurgy, cement, coke, glass production as well as long-range transport (LRT) [1] and compare the obtained data with previous results focused on iron mining and metallurgy [2]. The basic magnetic parameters used for TMPs characterization...
The combination of the increasing use of additive technologies and the availability of advanced materials allows for further efficiency improvements in existing applications and more sustainable solutions. The widespread use of silicon steels opens up many areas of development for engineers working in more depth with additive technology.
In this study, the $3$D printing applications of four...
This work is focused on the implementation of Barkhausen noise technique for monitoring of phase transformations in the austenitic steel after plastic deformation under the variety of loading regimes. The non-ferromagnetic austenite is transformed into the ferromagnetic martensite. The depth extent as well as the specific character of this transformation can be reliably monitored via...
