High-Velocity Magnetic Domain Wall Motion Driven by Acoustic Spin Transfer Torque

TL;DR

This paper predicts that surface acoustic waves can induce high-velocity magnetic domain wall motion via acoustic spin transfer torque, offering a new method for rapid and energy-efficient spintronic device operation.

Contribution

It introduces the concept of acoustic spin transfer torque driven by surface acoustic waves for fast magnetic domain wall motion, a novel mechanism in spintronics.

Findings

Domain wall velocity exceeds 50 m/s driven by acoustic spin.

Uniform out-of-plane spin angular momentum generated by SAWs.

Potential for energy-efficient rapid magnetic switching.

Abstract

We predict high-velocity magnetic domain wall (DW) motion driven by out-of-plane acoustic spin in surface acoustic waves (SAWs). We demonstrate that the SAW propagating at a 30-degree angle relative to the x-axis of a 128-degree Y-LiNbO3 substrate exhibits uniform out-of-plane spin angular momentum. This acoustic spin triggers the DW motion at a velocity exceeding 50 m/s in a way that is similar to the spin-transfer-torque (STT) effect. This phenomenon highlights the potential of acoustic spin in enabling rapid DW displacement, offering an innovative approach to developing energy-efficient spintronic devices.