We investigated the interaction of surface acoustic waves and spin waves with spatial resolution by micro-focused Brillouin light scattering spectroscopy in a Co40Fe40B20 ferromagnetic layer on a LiNbO3-piezoelectric substrate. We experimentally demonstrate that the magnetoelastic excitation of magnons by phonons is coherent by studying the interfering BLS-signals of the phonons and magnons during their conversion process.We find a pronounced spatial dependence of the phonon annihilation and magnon excitation which we map as a function of the magnetic field. The coupling efficiency of the surface acoustic waves (SAWs) and the spin waves (SWs) is characterized by a magnetic field dependent decay of the SAWs amplitude.
@article{arxiv.2311.16688,
title = {Coherent phonon-magnon interactions detected by micro-focused Brillouin light scattering spectroscopy},
author = {Yannik Kunz and Matthias Küß and Michael Schneider and Moritz Geilen and Philipp Pirro and Manfred Albrecht and Mathias Weiler},
journal= {arXiv preprint arXiv:2311.16688},
year = {2023}
}