Abstract
The theory of spin wave instability for ferromagnetic insulators is extended to include generalized anisotropy based on a tensor formulation of the static and dynamic effective fields. The formalism is set up for saturated magnetic ellipsoids and a general microwave field configuration. Both first- and second-order processes are considered. The analysis yields working formulae for the threshold microwave field amplitude evaluations and critical mode determinations. An example is given for first-order processs in a thin disk with easy plane anisotropy.
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