Magnetic skyrmion bubble motion driven by surface acoustic waves

TL;DR

This paper investigates how surface acoustic waves can control the movement of magnetic skyrmion bubbles, revealing mechanisms for their manipulation and proposing a resonant oscillator device.

Contribution

It introduces a method to control skyrmion bubbles using SAWs, deriving the force from strain gradients and exploring dynamical behaviors in different geometries.

Findings

SAWs induce a force proportional to strain gradient on skyrmion bubbles

Dynamical pinning and motion of bubbles can be controlled by SAWs in nanowires

Proposed a resonant skyrmion bubble oscillator in disk geometry

Abstract

We study the dynamical control of a magnetic skyrmion bubble by using counter-propagating surface acoustic waves (SAWs) in a ferromagnet. First, we determine the bubble mass and derive the force due to SAWs acting on a magnetic bubble using Thiele's method. The force that pushes the bubble is proportional to the strain gradient for the major strain component. We then study the dynamical pinning and motion of magnetic bubbles by SAWs in a nanowire. In a disk geometry, we propose a SAWs-driven skyrmion bubble oscillator with two resonant frequencies.