18th Czech and Slovak Conference on Magnetism

Tailoring the Matteucci Effect in Amorphous Glass-Coated Microwires by Thermal Annealing

2P-12

Jul 8, 2025, 5:30 PM

1h 30m

POSTER Topic 2 - Amorphous, nanocrystalline and other soft magnetic materials POSTER Session

Speaker

Dr Kornel Richter (Technical University of Košice, Faculty of Electrical Engineering and Informatics)

Description

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 voltage induced at the ends of the wire through two different mechanisms: (a) by domain wall depinning and (b) by domain wall motion. While the circular component of the surface magnetization can be effectively tailored by mechanical torsion, it remains an open question how the DWME could be enhanced through proper thermal treatment of the samples.

In this contribution, we tailor the magnetic properties of amorphous glass-coated microwires to enhance the DWME. It is shown that thermal annealing of microwires with and without applied torsion remarkably increases the DWME. While the DWME during domain wall motion is correlated only with the speed of the domain wall, the DWME induced by the depinning process is likely related to the complex closure domain structure.

The Magneto-Optical Kerr Effect (MOKE) is used to investigate the direction of the surface magnetization with high precision. Angular dependences of MOKE hysteresis loops are measured along various planes of incidence and linear polarization of the incident light. Theoretical calculations of the magneto-optical contrast for the transverse configuration of MOKE are used to quantify the small misalignment of the surface magnetization.

Finally, our laser-based MOKE loop-tracer [1] is used to correlate the sharp peaks of DWME with the rapid domain wall acceleration/deceleration process invoked by the interaction between the domain wall and pinning sites. The presence of the pinning sites is confirmed by direct imaging using MOKE microscopy.

Acknowledgements

Funded by the EU NextGenerationEU through the Recovery and Resilience Plan for Slovakia under the project No. 09I03-03-V04-00560.

References

[1] O. Vahovsky et al., “Experimental method for surface domain wall shape studies in thin magnetic cylinders,” Journal of Magnetism and Magnetic Materials, vol. 483. Elsevier BV, pp. 266–271, Aug. 2019. https://doi.org/10.1016/j.jmmm.2019.03.015