Phenomenology of current-induced skyrmion motion in antiferromagnets

TL;DR

This paper investigates how electric currents can move skyrmions in antiferromagnetic thin films, considering various interactions and external fields, and estimates their velocities using a phenomenological and collective coordinate approach.

Contribution

It introduces a comprehensive phenomenological model for current-induced skyrmion dynamics in antiferromagnets, including relaxation, spin-orbit torques, and magnetic textures.

Findings

Estimated skyrmion velocities under DC current

Inclusion of Dzyaloshinskii-Moriya interactions and magnetic field effects

Application of collective coordinate approach to 2D antiferromagnetic skyrmions

Abstract

We study current-driven skyrmion motion in uniaxial thin film antiferromagnets in the presence of the Dzyaloshinskii-Moriya interactions and in an external magnetic field. We phenomenologically include relaxation and current-induced torques due to both spin-orbit coupling and spatially inhomogeneous magnetic textures in the equation for the N\'eel vector of the antiferromagnet. Using the collective coordinate approach we apply the theory to a two-dimensional antiferromagnetic skyrmion and estimate the skyrmion velocity under an applied DC electric current.