Acoustically-driven magnons in CrSBr bilayers

TL;DR

This paper explores how acoustic waves can generate and control magnons in CrSBr bilayers, a stable 2D magnetic material, with potential applications in spintronics.

Contribution

It demonstrates strain-dependent inter-layer exchange coupling enabling resonant magnon generation by acoustic waves in CrSBr bilayers.

Findings

Magnons can be resonantly generated by acoustic waves in CrSBr bilayers.

External magnetic fields can tune the resonant frequency of magnon generation.

CrSBr's properties make it promising for spintronics applications.

Abstract

We study the coupling between spin excitations and acoustic waves in bilayers of CrSBr, an ambiently stable 2D magnetic material. We demonstrate that a strong dependence of inter-layer exchange coupling on strain makes possible the resonant generation of magnons by an acoustic wave. It is shown that the parameters of the generation, in particular the resonant frequency, can be tuned by an external magnetic field, which makes CrSBr a promising platform for spintronics applications.