Current induced domain wall dynamics in the presence of a transverse magnetic field in out-of-plane magnetized materials

TL;DR

This paper presents an analytical model for current-induced domain wall dynamics in out-of-plane magnetized materials, incorporating external transverse magnetic fields and validated by micromagnetic simulations.

Contribution

It introduces a new analytical model that accounts for domain wall deformation and tilting, enhancing understanding of domain wall behavior under transverse magnetic fields.

Findings

Model accurately predicts domain wall dynamics with external fields.

Transverse magnetic fields can prevent Walker breakdown.

Higher domain wall velocities achieved with external or current-induced fields.

Abstract

An analytical model was developped to describe the current induced DW dynamics of a Bloch DW in the presence of an external transverse magnetic field. The model takes into account the DW deformation and the magnetization tilting in the domain. The model is compared to the results of micromagnetic simulation and an excellent agreement is obtained. In the steady state regime, the model shows that the domain tilting does not change the DW mobility. An external or current induced transverse magnetic field such as the Oersted or Rashba field can prevent the Walker breakdown leading to a higher domain wall velocity.