Robust dynamics of antiferromagnetic skyrmion driven by spin-polarized current in small thin disks

TL;DR

This paper studies the behavior of antiferromagnetic skyrmions in small thin disks, showing they exhibit controllable, robust oscillatory dynamics driven by spin-polarized currents, unaffected by interface crossings.

Contribution

It demonstrates that antiferromagnetic skyrmions maintain stable oscillatory motion under current control and are resilient to interface disruptions, with shape modifications preserving energy.

Findings

Skyrmions exhibit controllable oscillations with specific amplitude and frequency.

Oscillatory dynamics are robust against interface crossing.

Shape modification of skyrmion core preserves energy over cycles.

Abstract

We investigate skyrmion configuration and dynamics in antiferromagnetic thin disks. It is shown that the skyrmion acquires oscillatory dynamics with well-defined amplitude and frequency which may be controlled on demand by the spin-polarized current. Such dynamics are robust in the sense that an interface between two half-disks cannot change the dynamics appreciably. Indeed, the skyrmion keeps its oscillatory despite crossing this interface. The way skyrmion found to do that is by modifying its core region shape so that its total energy is unaltered for several cycles.