SKM 2021 – scientific programme
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MA: Fachverband Magnetismus
MA 17: Skyrmions II (joint session MA/KFM)
MA 17.7: Talk
Friday, October 1, 2021, 11:45–12:00, H5
Lifetimes of skyrmions and antiskyrmions in exchange frustrated films — •Moritz A. Goerzen1, Stephan von Malottki1,2, Sebastian Meyer1,4, 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 — 4Université de Liège, Sart Tilman, Belgium
Recently, it has been shown that isolated skyrmions can be stabilized in zero magnetic field in a Rh/Co bilayer
on the Ir(111) surface due to frustration of exchange interactions [1].
Here, we predict that antiskyrmions are also metastable at zero field in this film system
and can co-exist with skyrmions.
Based on an atomistic spin model parametrized from density functional theory [1], we calculate the lifetime of
these co-existing topological states
using the geodesic nudged elastic band method as well as transition state theory in harmonic approximation [2,3].
We find significant differences between the lifetimes of skyrmions and antiskyrmions due to the effect
of the Dzyaloshinskii-Moriya interaction.
[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)