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MA: Fachverband Magnetismus

MA 37: Skyrmions III

MA 37.11: Vortrag

Donnerstag, 21. März 2024, 12:15–12:30, EB 301

Enhancing Skyrmion Diffusion by Alternating Excitations — •Maarten A. Brems, Raphael Gruber, Tobias Sparmann, Jan Rothörl, Peter Virnau, and Mathias Kläui — Institut für Physik, Johannes Gutenberg-Universität Mainz, Staudingerweg 7, 55128 Mainz, Germany

Magnetic skyrmions in thin films have been shown to exhibit thermal diffusion in a pinning-induced inhomogeneous energy landscape [1]. As a consequence, the targeted manipulation of the skyrmions' interaction with the pinning sites allows us to drastically enhance skyrmion diffusivity even at constant temperature. Recently, we have experimentally demonstrated an increase of the skyrmion diffusion coefficient by over two orders of magnitude [2]. Therein, we leverage the systems' intrinsic stochasticity directly as we employ fully deterministic excitations only. Constant-temperature tunability of stochastic motion is key to dynamically adjusting the speed-efficiency-balance of skyrmion-based Brownian computers [3] and thereby greatly enhances their application scenarios [4].

[1] R. Gruber et al., Nat Commun 13, 3144 (2022). [2] R. Gruber, M. A. Brems et al., Adv. Mater. 35, 2208922 (2023). [3] K. Raab, M. A. Brems et al., Nat. Commun. 13, 6982 (2022). [4] M. A. Brems et al., Appl. Phys. Lett. 119, 132405 (2021).

Keywords: Skyrmion; Diffusion; Stochastic motion; Thiele model; Skyrmion pinning