Magnetocrystalline anisotropy arising from a crystal field of magnitude comparable with exchange has been studied using a spin-wave theory. The `power law' temperature dependence of the anisotropy coefficients is modified at low temperatures, a result which is in agreement with the measurements of Rhyne and Clark. Values of crystal-field parameters deduced by comparison with experiment are a factor 2-3 larger than the results of screened point charge calculations.
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M. S. S. Brooks (1969) studied this question.
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