Spin-wave driven bidirectional domain wall motion in kagome antiferromagnets

TL;DR

This paper demonstrates a controllable method to manipulate domain walls in kagome antiferromagnets using spin waves, with the velocity and direction tunable by frequency, advancing potential for energy-efficient spintronic devices.

Contribution

It introduces a novel mechanism for bidirectional domain wall control in kagome antiferromagnets driven by spin waves, supported by analytical and simulation results.

Findings

Domain wall velocity depends on spin-wave frequency.

Analytical model explains mode coupling and velocity tuning.

Potential for energy-efficient antiferromagnetic devices.

Abstract

We predict a mechanism to controllably manipulate domain walls in kagome antiferromagnets via a single linearly polarized spin-wave source. We show by means of atomistic spin dynamics simulations of antiferromagnets with kagome structure that the speed and direction of the domain wall motion can be regulated by only tuning the frequency of the applied spin-wave. Starting from microscopics, we establish an effective action and derive the corresponding equations of motion for the spin-wave-driven domain wall. Our analytical calculations reveal that the coupling of two spin-wave modes inside the domain wall explains the frequency-dependent velocity of the spin texture. Such a highly tunable spin-wave-induced domain wall motion provides a key component toward next-generation fast, energy-efficient, and Joule-heating-free antiferromagnetic insulator devices.