Current-driven skyrmion motion along disordered magnetic tracks

TL;DR

This paper combines micromagnetic simulations and analytical modeling to understand how skyrmions move along disordered magnetic tracks under current pulses, providing insights relevant for experimental applications.

Contribution

It introduces an extended rigid skyrmion model that accurately predicts skyrmion dynamics during and after current pulses, validated against full micromagnetic simulations.

Findings

Analytical expressions match micromagnetic simulations in perfect samples.

Disorder effects on skyrmion motion are characterized.

The model helps interpret experimental skyrmion dynamics.

Abstract

The motion of skyrmions along ferromagnetic strips driven by current pulses is theoretically analyzed by means of micromagnetic simulations. Analytical expressions describing the skyrmion dynamics during and after the current pulse are obtained from an extended rigid skyrmion model, and its predictions are compared with full micromagnetic simulations for perfect samples with a remarkable agreement. The dynamics along realistic samples with random disorder is also studied by both models. Our analysis describes the relevant ingredients behind the current-driven skyrmion dynamics, and it is expected to be useful to understand recent and future experimental.