Dynamic Magnetoelastic Boundary Conditions and the Pumping of Phonons

TL;DR

This paper develops boundary conditions for magnetoelastic heterostructures under ferromagnetic resonance, revealing complex magnetization angle effects on phonon pumping in various layered systems.

Contribution

It introduces a general formalism for boundary conditions at magnetoelastic interfaces applicable to arbitrary magnetization directions and shapes.

Findings

Magnetization angle significantly influences phonon pumping efficiency.

Derived boundary conditions are applicable to diverse heterostructure geometries.

Nontrivial dependence of acoustic phonon pumping on magnetization orientation.

Abstract

We derive boundary conditions at the interfaces of magnetoelastic heterostructures under ferromagnetic resonance for arbitrary magnetization directions and interface shapes. We apply our formalism to magnet$\vert$nonmagnet bilayers and magnetic grains embedded in a nonmagnetic thin film, revealing a nontrivial magnetization angle dependence of acoustic phonon pumping.