Abstract
Using ferromagnetic resonance in Ca rich CaGe:YIG films, the anisotropy energy constants are determined by the best fit of resonance field data vs. angle. With decreasing temperature (294 to 180 K) the first-order cubic anisotropy constant K 1 increases nearly linearly, while the second-order constant K 2 increases dramatically. The uniaxial constant K u changes sign at about 240 K. When the sample is reduced in boiling FeCl 2, the linewidths are also reduced and the K u increases significantly while K 1 and K 2 decrease.
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