Abstract
We investigate magnons in ferromagnets with random anisotropy axes. It is assumed the applied field is large in comparison with the exchange and anisotropy fields. A coherent-anisotropy-field approximation is introduced, where the effect of the disorder is represented by a complex, energy-dependent anisotropy field, analogous to the coherent potential in the random-alloy problem. The real part of the anisotropy field represents the shift in the magnon energy, whereas the imaginary part gives the damping. The shift and damping of the uniform mode and the damping rate across the magnon band are calculated for both a uniform and a nonuniform distribution in the cosine of the angle between the anisotropy axis and the applied field.
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