SurfaceScience21 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 25: Poster Session II: Surface magnetism II
O 25.8: Poster
Montag, 1. März 2021, 13:30–15:30, P
Lifetimes of skyrmions and antiskyrmions in exchange frustrated systems — •Moritz A. Goerzen1, Stephan v. Malottki1, Sebastian Meyer1, Pavel F. Bessarab2,3, and Stefan Heinze1 — 1Institute of Theoretical Physics and Astrophysics, University of Kiel — 2University of Iceland, Reykjavík, Iceland — 3ITMO University, St. Petersburg, Russia
A recent study [1] on a Rh/Co bilayer on Ir(111) shows an interesting energy landscape for noncollinear magnetic states due to a high degree of exchange frustration. In particular we find, that both skyrmions and antiskyrmions co-exist in this system, which is beneficial for future spintronic technologies. Based on an atomistic spin model parameterized from density functional theory, we investigate the lifetime of co-existing states by long time scale spin dynamic simulations using the geodesic nudged elastic band method as well as transition state theory in harmonic approximation [2,3]. Due to a different number of internal degrees of freedom for skyrmions and antiskyrmions in systems without inversion symmetry, we find large differences between lifetimes of these states.
[1] Meyer, Perini et al., Nature Comm. 10, 3823 (2019)
[2] Bessarab et al., Sci. Rep. 8, 3433 (2018)
[3] von Malottki et al., Phys. Rev. B 99, 060409 (2019)