Coherent surface acoustic wave–spin wave interactions detected by micro-focused Brillouin light scattering spectroscopy Article Swipe

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Brillouin Spectroscopy Brillouin scattering Spectroscopy Brillouin zone Light scattering Scattering Materials science Coherent spectroscopy Spin wave Surface wave Optics Condensed matter physics Physics Raman scattering Raman spectroscopy Laser Coherent anti-Stokes Raman spectroscopy Quantum mechanics Ferromagnetism

Yannik Kunz , Matthias Küß , Michael Schneider , Moritz Geilen , Philipp Pirro , M. Albrecht , Mathias Weiler ·

YOU? · · 2024 · Open Access · · DOI: https://doi.org/10.1063/5.0189324 · OA: W4394621076

We investigated the interaction of surface acoustic waves and spin waves with spatial resolution by micro-focused Brillouin light scattering spectroscopy in a Co40Fe40B20(10 nm) ferromagnetic layer on a LiNbO3-piezoelectric substrate. We experimentally demonstrate that the magnetoelastic excitation of magnons by phonons is coherent by studying the interference of light scattered off generated magnons and annihilated phonons. 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 is characterized by a magnetic field-dependent decay of the SAWs amplitude.