Dynamics of hybrid magnetic skyrmion driven by spin-orbit torque in ferrimagnets

TL;DR

This paper investigates the dynamics of hybrid magnetic skyrmions in ferrimagnets driven by spin-orbit torque, revealing how their motion can be controlled and optimized by tuning material parameters, with implications for spintronic devices.

Contribution

It introduces a theoretical and numerical study of hybrid magnetic skyrmions in ferrimagnets, demonstrating controllable motion and suppression of the skyrmion Hall effect through material tuning.

Findings

Skyrmion Hall effect depends on helicity and net angular momentum.

Tuning Dzyaloshinskii-Moriya interaction modulates skyrmion motion.

Faster skyrmion dynamics in ferrimagnets compared to antiferromagnets.

Abstract

Magnetic skyrmions are magnetic textures with topological protection, which are expected to be information carriers in future spintronic devices. In this work, we propose a scheme to implement hybrid magnetic skyrmions (HMS) in ferrimagnets, and we study theoretically and numerically the dynamics of the HMS driven by spin-orbit torque. It is revealed that the skyrmion Hall effect depends on the skyrmion helicity and the net angular momentum ({\delta}s), allowing the effective modulation of the HMS motion through tuning Dzyaloshinskii-Moriya interaction and {\delta}s. Thus, the Hall effect can be suppressed through selecting suitable materials to better control the HMS motion. Moreover, Magnus force for finite {\delta}s suppresses the transverse motion and enhances the longitudinal propagation, resulting in the HMS dynamics in ferrimagnets faster than that in antiferromagnets.