Acoustic waves generated by the spin precession

TL;DR

This paper investigates how a precessing nanoparticle spin can generate detectable acoustic waves on a solid surface, elucidating the Einstein-de Haas effect through a conservation law-based model.

Contribution

It introduces a parameter-free theoretical framework for predicting acoustic wave generation by spin precession, linking microscopic spin dynamics to macroscopic mechanical responses.

Findings

Acoustic waves of detectable amplitude can be generated by spin precession.

The model is based on conservation of total angular momentum.

Potential for detection via tunneling electron microscopy.

Abstract

We study generation of acoustic waves by a precessing spin of a nanoparticle deposited on the surface of a solid. Our approach elucidates macroscopic dynamics of the Einstein - de Haas effect. It is based upon solution of parameter-free equations of motion mandated by the conservation of the total angular momentum: spin + mechanical. We show that the amplitude of the acoustic waves generated by the spin precession may be sufficient for detection by a tunneling electron microscope.