Abstract
Experiments are described on microwave echoes observed in axially magnetized yttrium iron garnet cylinders following the application of two pulses in which the second is twice the frequency of the first. The echoes result from the radiation from the manifold of magnetostatic modes excited to resonance by the first pulse and selectively amplified by the second pulse. The parametric amplification results from the Suhl subsidiary absorption. The echo experiment differs from the previous magnetostatic mode echo experiments of Kaplan because of the difference in frequency of the second pulse, and it differs from that of Damon and van de Vaart because the excitations are nonpropagating magnetostatic modes. An analysis of the three-pulse magnetostatic mode echo experiment is presented in order to demonstrate the necessity for the above interpretation of the present experiment.
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