Magnetic field gradient driven dynamics of isolated skyrmions and antiskyrmions in frustrated magnets

TL;DR

This paper investigates how magnetic field gradients influence the motion of isolated skyrmions and antiskyrmions in frustrated magnets, revealing Hall-like behavior and confinement effects that are relevant for spintronics.

Contribution

It demonstrates the dynamics of skyrmions and antiskyrmions driven by magnetic field gradients in frustrated magnets, including the suppression of Hall motion in nano-stripes and the role of damping.

Findings

Hall-like motion in bulk frustrated magnets

Suppression of Hall motion in nano-stripes

Motion speed depends on Gilbert damping constant

Abstract

The study of skyrmion/antiskyrmion motion in magnetic materials is very important in particular for the spintronics applications. In this work, we study the dynamics of isolated skyrmions and antiskyrmions in frustrated magnets driven by magnetic field gradient, using the Landau-Lifshitz-Gilbert simulations on the frustrated classical Heisenberg model on the triangular lattice. A Hall-like motion induced by the gradient is revealed in bulk system, similar to that in the well-studied chiral magnets. More interestingly, our work suggests that the lateral confinement in nano-stripes of the frustrated system can completely suppress the Hall motion and significantly speed up the motion along the gradient direction. The simulated results are well explained by the Thiele theory. It is demonstrated that the acceleration of the motion is mainly determined by the Gilbert damping constant, which provides useful information for finding potential materials for skyrmion-based spintronics.