SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 12: Skyrmions II

MA 12.8: Vortrag

Dienstag, 28. März 2023, 11:15–11:30, HSZ 02

Enhanced Skyrmion Diffusion by Periodic Excitation — •Raphael Gruber, Maarten Brems, Jan Rothörl, Tobias Sparmann, Fabian Kammerbauer, Iryna Kononenko, Maria-Andromachi Syskaki, Peter Virnau, and Mathias Kläui — Institut für Physik, Johannes-Gutenberg Universität Mainz, 55099 Mainz, Germany

Magnetic skyrmions are chiral, quasi-particle spin structures that are considered as promising candidates for data storage, logic and non-conventional computing devices. When thermal excitation of the spins overcomes the variations in the energy landscape of a sample, skyrmions exhibit thermal motion as recently reported [1]. For non-conventional computing, diffusion is essential and its speed is key. Although pinning slows down diffusion, a finite effect of pinning is even required in order to ensure the system's complexity and non-linearity for non-conventional computing [2]. Using magneto-optical Kerr microscopy, we demonstrate that we can drastically increase the diffusion coefficient of micrometer-sized skyrmions in magnetic thin films by excitation with oscillating magnetic fields. The faster motion is traced back to a reduction of the effective pinning since the skyrmion pinning is strongly size-dependent [3]. Our findings thus pave the way to a significant increase of both performance and reliability of skyrmion devices, especially in non-conventional computing.

[1] Zázvorka, et al. Nat. Nanotechnol. 14, 658-661 (2019) [2] Raab et al. Nat Commun 13, 6982 (2022). [3] Gruber et al. Nat Commun 13, 3144 (2022).