Magnetoelastic Waves in Ferromagnetic Thin Films Mediated by Dipolar Interactions

TL;DR

This paper presents a theoretical study of magnetoelastic waves in ferromagnetic thin films, highlighting hybridization effects between magnetostatic and Lamb waves due to dipolar interactions, with numerical results for YIG films.

Contribution

Develops a comprehensive theoretical model incorporating dipolar fields and elastic deformations to predict hybrid magnetoelastic wave behavior in thin films.

Findings

Hybridization between magnetostatic and Lamb waves predicted.

Anti-crossings observed in dispersion relations for YIG films.

Hybridization gaps range from 0.1 to several MHz.

Abstract

Magnetoelastic coupling mediated by magnetic dipolar interactions is theoretically investigated in ferromagnetic thin films under an in-plane magnetic field. We develop a theoretical description that incorporates dipolar fields derived from Maxwell's equations in the presence of elastic deformations. The resulting coupled equations of motion predict hybridization between magnetostatic and Lamb waves. Numerical calculations for a yttrium iron garnet (YIG) film reveal anti-crossings in the dispersion relations, with hybridization gaps ranging from $0.1$ to several MHz.