Current-driven vortex domain wall dynamics by micromagnetic simulations

TL;DR

This paper investigates the behavior of vortex domain walls driven by current in magnetic wires using analytical models and micromagnetic simulations, revealing critical currents and dynamics differences.

Contribution

It introduces a two-dimensional analytical model for vortex wall dynamics and verifies it with micromagnetic simulations, including a critical current for wall transformation.

Findings

Analytical solution for vortex wall velocity and deformation.

Identification of a critical current for vortex-to-transverse wall transformation.

Verification of analytical results through micromagnetic simulations.

Abstract

Current-driven vortex wall dynamics is studied by means of a two-dimensional analytical model and micromagnetic simulation. By constructing a trial function for the vortex wall in the magnetic wire, we analytically solve for domain wall velocity and deformation in the presence of the current-induced spin torque. A critical current for the domain wall transformation from the vortex wall to the transverse wall is calculated. A comparison between the field- and current-driven wall dynamics is carried out. Micromagnetic simulations are performed to verify our analytical results.