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This paper shows that the low−frequency modulation of the reflected power in YIG spheres is consistent with the interpretation of standing spin waves only if the wave vector is constant over a wide range of values of magnetic field in the subsidiary absorption region. Identical experiments on YIG disks show good agreement with the standing−spin−wave interpretation. The only difference in the experiment is the shape of the sample and its linewidth.
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Thomas et al. (1975) studied this question.
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