Magnon-Driven Domain-Wall Motion with the Dzyaloshinskii-Moriya Interaction

TL;DR

This paper investigates how Dzyaloshinskii-Moriya interaction (DMI) influences magnon-driven domain wall motion, revealing a linear momentum transfer mechanism that causes domain wall rotation, which is more efficient than angular momentum transfer under certain conditions.

Contribution

It introduces a novel linear momentum transfer mechanism induced by DMI that enhances domain wall motion driven by spin waves, differing from traditional angular momentum transfer.

Findings

DMI causes a torque on the domain wall via spin wave passage.

Linear momentum exchange results in domain wall rotation, not translation.

Effective easy plane anisotropy amplifies the DMI-induced motion efficiency.

Abstract

We study domain wall (DW) motion induced by spin waves (magnons) in the presence of Dzyaloshinskii-Moriya interaction (DMI). The DMI exerts a torque on the DW when spin waves pass through the DW, and this torque represents a linear momentum exchange between the spin wave and the DW. Unlike angular momentum exchange between the DW and spin waves, linear momentum exchange leads to a rotation of the DW plane rather than a linear motion. In the presence of an effective easy plane anisotropy, this DMI induced linear momentum transfer mechanism is significantly more efficient than angular momentum transfer in moving the DW.