We propose a new model for magnetism in an amorphous material. The model is particularly appropriate for rare-earth compounds such as TbF₂. It is a Heisenberg model in which each ionic spin is subjected to a local anisotropy field of random orientation. We discuss the magnetic properties of two simple ionic configurations, and show that the model is in qualitative agreement with the experimental data.
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Harris et al. (1973) studied this question.
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