The interaction between surface acoustic waves and magnetization offers an efficient route for electrically controlling magnetic states. Here, we demonstrate the excitation of magnetoacoustic waves in galfenol, a highly magnetostrictive alloy made of iron (72%) and gallium (28%). We quantify the amplitude of the induced magnetization oscillations using magnetic imaging in an X-ray photoelectron microscope and estimate the dynamic magnetoelastic constants through micromagnetic simulations. Our findings demonstrate the potential of galfenol for magnonic applications and reveal that, despite strong magnetoelastic coupling, magnetic interactions and spin-wave dispersion relations significantly influence the overall amplitude of magnetoacoustic waves.
@article{arxiv.2409.04370,
title = {Magnetoacoustic waves in a highly magnetostrictive FeGa thin film},
author = {Marc Rovirola and M. Waqas Khaliq and Blai Casals and Adrian Begué and Neven Biskup and Noelia Coton and Joan Manel Hernàndez and Miguel Angel Niño and Michael Foerster and Alberto Hernández-Mínguez and Rocío Ranchal and Marius V. Costache and Antoni García-Santiago and Ferran Macià},
journal= {arXiv preprint arXiv:2409.04370},
year = {2024}
}