SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 47: Skyrmions IV
MA 47.2: Vortrag
Freitag, 31. März 2023, 09:45–10:00, HSZ 04
Coarse-graining skyrmion ensemble analysis — •Thomas Brian Winkler1, Jan Rothörl1, Maarten A. Brems1, Hans Fangohr2,3, and Mathias Kläui1 — 1Institute of Physics, Johannes Gutenberg University Mainz, Germany — 2Faculty of Engineering and Physical Sciences, University of Southampton, United Kingdom — 3Max Planck Institute for the Structure and Dynamics of Matter Hamburg, Hamburg
Magnetic skyrmion are heavily investigated due to their interesting physics and their potential for unconventional computing schemes [1,2]. In confined geometries the thermal diffusion of skyrmions depends heavily on the ability of the skyrmion ensemble to arrange with respect to the confinement in a commensurate manner [3,4]. If external forces like spin-orbit torques are applied to such systems, the steady states of the system might change. We use a coarse-graining to analyse the system with methods from statistical physics [5] to ascertain the relevant states that the collective system is entering. We find in a simulational case study of four skyrmions in a triangular geometry that the steady states of a system are changing when external forces are applied. Such analysis is useful to optimise geometries or read-out positions of magnetic tunnel junctions for skyrmion-based devices. [1] K. Everschor-Sitte et al., Journal of Applied Physics 124, 240901 (2018). [2] K. Raab et al., Nat. Comm. 13, 6982 (2022). [3] C. Song et al., Adv. Funct. Mater. 31, 2010739 (2021). [4] A. F. Schäffer et al., Commun Phys 2, 72 (2019). [5] B. Reuter et al., J Chem. Theory Comput. 14, 3579 (2018).