Abstract
A polished, ellipsoidal, single crystal, yttrium iron garnet sample with rotation axis along a [100] direction and ΔH = 1.0 oe was prepared. X-band measurements of the microwave resonant frequency were made as a function of rf power. The resonant frequency was found to shift at the rate of 41 Mc/w. The shift of the resonant frequency was related to the number of k = 0 magnons (n0) and the number of k ≠ 0 magnons (nk)by means of spin-wave theory. From this relation and the experimental data the value of nk/n0 was determined to be 2.7.
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