Resonant excitation of vortex gyrotropic mode via surface acoustic waves

TL;DR

This paper introduces a novel energy-efficient method to excite magnetic vortex gyrotropic modes using surface acoustic waves and inverse magnetostriction, supported by analytical modeling and micromagnetic simulations.

Contribution

The work develops an analytical model for vortex core excitation via surface acoustic waves and validates it with simulations, advancing energy-efficient magnetic control techniques.

Findings

Resonant surface acoustic waves can excite vortex gyrotropic modes.

Vortex core oscillation depends on acoustic wave amplitude and bias field.

The approach offers an alternative to current-induced magnetic excitations.

Abstract

Finding new energy-efficient methods for exciting magnetization dynamics is one of the key challenges in magnonics. In this work, we present an approach to excite the gyrotropic dynamics of magnetic vortices through the phenomenon of inverse magnetostriction, also known as the Villari effect. We develop an analytical model based on the Thiele formalism that describes the gyrotropic motion of the vortex core including the energy contributions due to inverse magnetostriction. Based on this model, we predict excitations of the vortex core resonances by surface acoustic waves whose frequency is resonant with the frequency of the vortex core. We verify the model's prediction using micromagnetic simulations, and show the dependence of the vortex core's oscillation radius on the surface acoustic wave amplitude and the static bias field. Our study contributes to the advancement of energy-efficient magnetic excitations by relying on voltage-induced driven dynamics, which is an alternative to conventional current-induced excitations.