SKM 2021 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 17: Skyrmions II (joint session MA/KFM)

MA 17.12: Vortrag

Freitag, 1. Oktober 2021, 13:00–13:15, H5

Skyrmion Dynamics at Finite Temperatures: Beyond Thiele's Equation — •Markus Weißenhofer, Levente Rózsa, and Ulrich Nowak — Fachbereich Physik, Universität Konstanz, Universitätsstraße 10, DE-78457 Konstanz, Germany

Magnetic textures are often treated as quasiparticles following Thiele's equation of motion [1]. We use atomistic spin simulations based on the stochastic Landau-Lifshitz-Gilbert equation to simulate the Brownian and current-driven motion of ferromagnetic skyrmions in a (Pt0.95Ir0.05)/Fe-bilayer on a Pd(111) surface.

Our results reveal that the existing theory based on Thiele's equation is insufficient to describe the dynamics of skyrmions at finite temperatures. We propose an extended equation of motion that goes beyond Thiele's equation by taking into account the coupling of the skyrmion to the magnonic heat bath leading to an additional dissipative term that is linear in temperature. Our results indicate that this so-far-neglected magnon-induced friction even dominates for elevated temperatures and lower Gilbert damping values, typical for thin films and multilayers [2].

[1] A. A. Thiele, Phys. Rev. Lett. 30, 230, (1973)

[2] Weißenhofer et al. , Phys. Rev. Lett., (in press 2021)