Magneto-rotation coupling dominates surface acoustic wave driven ferromagnetic resonance in the longitudinal geometry

TL;DR

This paper introduces a micromagnetic simulation extension to model surface acoustic wave-driven ferromagnetic resonance, highlighting the dominance of magneto-rotation coupling in longitudinal geometry and demonstrating strong coupling regimes.

Contribution

It develops a phonon-magnon extension for the mumax+ framework that incorporates multiple SAW-magnon coupling mechanisms and validates them through various benchmark simulations.

Findings

Magneto-rotation coupling dominates in longitudinal geometry.

Strong coupling achieved with a high cooperativity (C=257).

Magnetoelastic coupling produces zero transverse torque in this setup.

Abstract

We present a phonon-magnon extension for the mumax+ micromagnetic framework that implements three surface acoustic wave (SAW) coupling mechanisms: magnetoelastic strain coupling, magneto-rotation coupling arising from the antisymmetric displacement gradient, and spin-rotation (Barnett) coupling from the lattice angular velocity. Six benchmark simulations validate the implementation through SAW-driven domain-wall motion, magnetization switching, magneto-rotation and Barnett field validation, nonreciprocal SAW-magnon absorption from Rayleigh-wave chirality, and spatially resolved coupling in a standing SAW cavity. For the longitudinal geometry (m_0 parallel to k_SAW), we show that the magnetoelastic coupling produces zero transverse torque despite generating a 50 times larger effective field; the magneto-rotation channel provides the sole driving mechanism. The crossover angle below which MR dominates is theta_c approximately 1.1 degrees for YIG parameters. Treating the magneto-rotation coupling constant K_mr as a tunable parameter, we map out the cooperativity phase diagram and show that MR alone can achieve strong coupling (C = 257 for K_mr = 1 MJ/m^3) with an avoided-crossing splitting of 13.6 MHz.