The effect of the Magnus force on skyrmion relaxation dynamics

TL;DR

This study uses Langevin simulations to explore how the Magnus force influences skyrmion relaxation, revealing regimes where it either enhances disorder or promotes slow dynamics, thus affecting the approach to equilibrium.

Contribution

It provides a systematic analysis of the Magnus force's role in skyrmion relaxation dynamics, highlighting its dual effects in different regimes.

Findings

Magnus force enhances thermal noise effects in noise-dominated regime.

Magnus force cooperates with skyrmion interactions to slow decay of correlations.

Magnus force generally accelerates relaxation to steady state.

Abstract

We perform systematic Langevin molecular dynamics simulations of interacting skyrmions in thin films. The interplay between Magnus force, repulsive skyrmion-skyrmion interaction and thermal noise yields different regimes during non-equilibrium relaxation. In the noise-dominated regime the Magnus force enhances the disordering effects of the thermal noise. In the Magnus-force-dominated regime, the Magnus force cooperates with the skyrmion-skyrmion interaction to yield a dynamic regime with slow decaying correlations. These two regimes are characterized by different values of the aging exponent. In general, the Magnus force accelerates the approach to the steady state.