Conveners
POSTER Session: PART 1 (Topics 2, 3, 5 and 9 )
- Adriana Zeleňáková (Pavol Jozef Šafárik University in Košice, Faculty of Science, Institute of Physics)
- Pavol Sovák (Pavol Jozef Šafárik University in Košice, Faculty of Science, Institute of Physics)
POSTER Session: PART 2 (Topics 1, 4, 6, 7, 8 and 10)
- Adriana Zeleňáková (Pavol Jozef Šafárik University in Košice, Faculty of Science, Institute of Physics)
- Pavol Sovák (Pavol Jozef Šafárik University in Košice, Faculty of Science, Institute of Physics)
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...
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...
