The generation of microwave acoustic waves by the resonance modes in a magnetic film is discussed. An initial orienta-[SI, using permalloy films a t 9 Gc/s, described the phonon generation under a variety of conditions. Using a viewpoint similar to that of Bommel and Dransfeld, he gave equations of motion for the elastic waves with magnetostrictive driving terms. This helped to explain the observed polarizations of the acoustic waves, but left unexplained some anomalies on SWR. One such anomaly was the observation that some higher-order spin waves, which had wavelengths less than the phonon wavelength, apparently interacted more strongly with the phonons than some lower-order spin waves, which had wavelengths more nearly comparable to the phonon wavelength. At this point Kooi [6] proposed a new explanation for the inequality of the observed spin wave and phonon wavelengths. He utilized the idea, originally due to Portis [7], which postulates the existence of a variation in dc magnetization or 1388 PROCEEDISGS OF THE IEEE OCTOBER anistropy field through the film thickness. This model implies that nonsinusoidal spin-wave modes exist on
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