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We investigated the interaction of surface acoustic waves and spin waves withspatial resolution by micro-focused Brillouin light scattering spectroscopy ina Co$_{40}$Fe$_{40}$B$_{20}$ ferromagnetic layer on a LiNbO$_{3}$-piezoelectricsubstrate. We experimentally demonstrate that the magnetoelastic excitation ofmagnons by phonons is coherent by studying the interfering BLS-signals of thephonons and magnons during their conversion process.We find a pronouncedspatial dependence of the phonon annihilation and magnon excitation which wemap as a function of the magnetic field. The coupling efficiency of the surfaceacoustic waves (SAWs) and the spin waves (SWs) is characterized by a magneticfield dependent decay of the SAWs amplitude.

Coherent phonon-magnon interactions detected by micro-focused Brillouin light scattering spectroscopy