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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.
Harris et al. (Mon,) studied this question.