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MA: Fachverband Magnetismus

MA 37: Skyrmions III

MA 37.10: Vortrag

Donnerstag, 21. März 2024, 12:00–12:15, EB 301

Enhanced thermally-activated skyrmion diffusion with tuneable effective gyro tropic force — Takkaki Dohi¹, Markus Weißenhofer², Nico Kerber¹, Fabian Kammerbauer¹, Yuqing Ge¹, •Klaus Raab¹, Jakub Zázvorka³, Maria-Andromachi Syskaki^1,4, Aga Shahee¹, Moritz Ruhwedel⁵, Tobias Böttcher⁵, Philip Pirro⁵, Gerhard Jakob¹, Ulrich Nowak², and Mathias Kläui¹ — ¹Institut für Physik, Johannes Gutenberg-Universität Mainz, Staudingerweg 7, 55128 Mainz, Germany — ²Fachbereich Physik, Universität Konstanz, DE-78457 Konstanz, Germany — ³Institute of Physics, Faculty of Mathematics and Physics, Charles University, Ke Karlovu 5, Prague 12116, Czech Republic — ⁴Singulus Technologies AG, 63796 Kahl am Main, Germany — ⁵Fachbereich Physik and Landesforschungszentrum OPTIMAS, TU Kaiserslautern, Gottlieb-Daimler-Straße 46, 67663 Kaiserslautern, Germany

The topology of magnetic skyrmions lets them respond distinctly to electromagnetic stimuli and should have a substantial effect on stochastic diffusive motion. We present enhanced thermally activated diffusive motion of skyrmions within a specially designed synthetic antiferromagnet1, in which the topology can be precisely tuned2. By suppressing the effective topological charge, we achieve a diffusion coefficient more than ten times higher compared to ferromagnetic skyrmions and demonstrate the topology-dependence of the diffusive dynamics. 1.*Dohi, T. et al. Nat. Commun. 10, 5153 (2019). 2.*Dohi, T. et al. Nat. Commun. 14 (2023).

Keywords: Antiferromagnet; Synthetic Antiferromagnet; Diffusion; Magnetisation compensation; Topology