Dynamics of an elliptical ferromagnetic skyrmion driven by the spin-orbit torque

TL;DR

This paper investigates the current-driven dynamics of elliptical ferromagnetic skyrmions with anisotropic Dzyaloshinskii-Moriya interaction, revealing how their shape influences the skyrmion Hall effect and offering control methods for spintronic applications.

Contribution

It introduces a numerical and theoretical study of elliptical skyrmion dynamics, highlighting the shape-dependent control of the skyrmion Hall angle in ferromagnetic thin films.

Findings

Skyrmion Hall angle can be tuned by skyrmion shape profile.

Elliptical skyrmion shape affects the skyrmion Hall effect.

Method for minimizing skyrmion Hall angle for device applications.

Abstract

Magnetic skyrmion is a promising building block for developing information storage and computing devices. It can be stabilized in a ferromagnetic thin film with the Dzyaloshinskii-Moriya interaction (DMI). The moving ferromagnetic skyrmion may show the skyrmion Hall effect, that is, the skyrmion shows a transverse shift when it is driven by a spin current. Here, we numerically and theoretically study the current-driven dynamics of a ferromagnetic nanoscale skyrmion in the presence of the anisotropic DMI, where the skyrmion has an elliptical shape. The skyrmion Hall effect of the elliptical skyrmion is investigated. It is found that the skyrmion Hall angle can be controlled by tuning the profile of elliptical skyrmion. Our results reveal the relation between the skyrmion shape and the skyrmion Hall effect, which could be useful for building skyrmion-based spintronic devices with preferred skyrmion Hall angle. Also, our results provide a method for the minimization of skyrmion Hall angle for applications based on in-line motion of skyrmions.