Interaction of Ultrasonic Waves with Thin Magnetic Films

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Abstract
We discuss the interaction of an externally generated ultrasonic wave with a thin magnetic film, and the generation of phonons by driving such a film with a microwave field. Several geometries are considered. If the frequency of the driving wave is close to one of the spin-wave resonance frequencies of the film, we exhibit an exact solution to the phonon equation of motion in the presence of one-magnon-one-phonon terms in the magneto-elastic coupling. Some difficulties present in an earlier theory are eliminated.