SKM 2023 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 23: Poster Magnetism I

MA 23.5: Poster

Dienstag, 28. März 2023, 17:00–19:00, P1

Enhanced diffusion of antiferromagnetically coupled skyrmions — Takaaki Dohi¹, Markus Weißenhofer², Nico Kerber¹, Fabian Kammerbauer¹, •Maria-Andromachi Syskaki¹, 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

Magnetic skyrmions are attractive for the intriguing responses governed by their topology [1]. However, some of the topology-dependent features of magnetic skyrmions are recognized as an obstacle to device applications, e.g. the skyrmion Hall effect [2], which however does not occur in antiferromagmetic skyrmions. Here we demonstrate that a synthetic antiferromagnetic (SyAFM) system [3] with low pinning enables thermally-activated diffusive motion of antiferromagnetically-coupled skyrmions. The systematic investigation varying the compensation ratio of magnetic moments in the magnetic sub-lattices with our analysis accounting for pinning effects allows for disentangling the influence of the topology on the diffusive motion. Our analysis reveals an at least 10 times larger diffusion coefficient for highly compensated antiferromagnetically-coupled skyrmions that is a direct consequence of the reduction of the effective topological charge, which enables energy-efficient unconventional computing. [1] N. Nagaosa and Y. Tokura, Nat. Nanotechnol. 8, 899 (2013). [2] K. Litzius et al., Nat. Phys. 13, 170 (2017). [3] T. Dohi et al., Nat. Commun. 10, 5153 (2019).