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The parametric coupling between traveling electromagnetic and elastic waves in a ferrimagnet supplied by magnetic pumping is theoretically investigated. The pumping threshold is calculated for steady-state wave propagation in the presence of loss for plane electromagnetic and longitudinal elastic waves in an infinite ferrite medium. This threshold is compared to the threshold for second-order spin-wave instabilities and it is found that these spin wave processes should not prevent the magnetoelastic process from occurring. It is shown that this traveling wave system may be useful for amplifying electromagnetic or elastic waves.
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R. L. Comstock (1963) studied this question.
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