Current-driven and field-driven domain walls at nonzero temperature

TL;DR

This paper develops a model for the dynamics of current- and field-driven domain walls at nonzero temperature, incorporating thermal effects and depinning phenomena, and compares it with existing theories and experiments.

Contribution

It introduces a comprehensive model using the Fokker-Planck equation to describe thermally-averaged domain wall velocities and depinning times, covering various domain wall types.

Findings

Derived drift velocities from the Fokker-Planck equation.

Calculated depinning times for different domain wall configurations.

Validated model against previous theoretical and experimental results.

Abstract

We present a model for the dynamics of current- and field-driven domain-wall lines at nonzero temperature. We compute thermally-averaged drift velocities from the Fokker-Planck equation that describes the nonzero-temperature dynamics of the domain wall. As special limits of this general description, we describe rigid domain walls as well as vortex domain walls. In these limits, we determine also depinning times of the domain wall from an extrinsic pinning potential. We compare our theory with previous theoretical and experimental work.