Current-induced domain wall motion including thermal effects based on Landau-Lifshitz-Bloch equation

TL;DR

This paper uses the Landau-Lifshitz-Bloch equation with spin torque extensions to simulate and analyze how temperature influences current-driven domain wall motion, revealing complex velocity behaviors.

Contribution

It introduces a finite-temperature micromagnetic model incorporating spin torque effects within the LLB framework for domain wall dynamics.

Findings

Velocity depends on the balance of adiabatic and non-adiabatic spin torques.

Domain wall velocity exhibits non-monotonous temperature dependence.

Results may aid experimental determination of spin torque parameters.

Abstract

We employ the Landau-Lifshitz-Bloch (LLB) equation to investigate current-induced domain wall motion at finite temperatures by numerical micromagnetic simulations. We extend the LLB equation with spin torque terms that account for the effect of spin-polarized currents and we find that the velocities depend strongly on the interplay between adiabatic and non-adiabatic spin torque terms. As a function of temperature, we find non-monotonous behavior, which might be useful to determine the relative strengths of the spin torque terms experimentally.