Spin wave driven domain wall motion in easy-plane ferromagnets: a particle perspective

TL;DR

This paper models the interaction between spin waves and domain walls in easy-plane ferromagnets as a particle collision, revealing a gravity-like attraction and backward displacement of the domain wall.

Contribution

It introduces a particle perspective to describe spin wave and domain wall interactions, highlighting gravity-like attraction and dissipation effects.

Findings

Domain wall experiences backward displacement due to spin wave interaction.

Interaction modeled as collision of particles with gravity-like attraction.

Magnetic dissipation causes the domain wall to behave like a viscous particle.

Abstract

In easy-plane ferromagnets, we show that the interplay between a domain wall and a spin wave packet can be formulated as the collision of two massive particles with a gravity-like attraction. In the presence of magnetic dissipation, the domain wall mimics a particle subject to viscous friction, while the spin wave packet resembles a particle of variable mass. Due to attractive nature of the interaction, the domain wall acquires a backward displacement as a spin wave packet penetrating the domain wall, even though there is no change in momentum of the wave packet before and after penetration.