Abstract
Rapid amplitude fluctuations of magnetoelastic waves have been observed in axially magnetized, [110]-oriented YIG rods as the magnetic field, and hence delay time, are varied. The fluctuations are characterized by an 8 to 14 dB amplitude fluctuation of the entire delayed pulse with a period varying from 0.025 to 0.08 μsec. Analysis based on the interference of two pure shear elastic modes of the YIG sample coupled to the magnetic-spin system predicts an amplitude fluctuation of 11.8 dB with a period of 0.04 μsec, which compares well with the observed results. A description of the observed amplitude fluctuation, and its analysis, is presented. Factors necessary for the observation of this amplitude fluctuation and means by which it can be eliminated are discussed.
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