Propagation of Coupled Acoustic, Electromagnetic and Spin Waves in Saturated Ferromagnetoelastic Solids

TL;DR

This paper investigates how acoustic, electromagnetic, and spin waves propagate and interact in saturated ferromagnetoelastic solids, revealing coupling mechanisms and dispersion characteristics in such complex materials.

Contribution

It introduces a comprehensive analysis of wave propagation in ferromagnetoelastic solids, extending existing models to include dynamic electromagnetic fields and spin wave interactions.

Findings

Coupling of acoustic, electromagnetic, and spin waves demonstrated.

Dispersion relations and cutoff frequencies derived.

Indirect interaction between acoustic and electromagnetic waves via spin waves identified.

Abstract

We study the propagation of plane waves in an unbounded body of a saturated ferromagnetoelastic solid. The equations by Tiersten for small fields superposed on finite initial fields in a saturated ferromagnetoelastic material are employed, with their quasistatic magnetic field extended to dynamic electric and magnetic fields for electromagnetic waves. Dispersion relations of the plane waves are obtained. The cutoff frequencies and long wave approximation of the dispersion curves are determined. Results show that acoustic, electromagnetic and magnetic spin waves are coupled in such a material. For YIG which is a cubic crystal without piezoelectric coupling, the acoustic and electromagnetic waves are not directly coupled but they can still interact indirectly through spin waves.