A new method for the determination of crystal field and exchange parameters in rare-earth/transition-metal compounds, involving the analysis of magnetisation curves, is described. Rather than trying to reproduce directly the magnetisation curves by computer diagonalisation using crystal field and exchange parameters, the method uses experimentally determined anisotropy constants. These constants are parameters which reproduce the magnetisation curves but to which no special physical significance is attached. The energy expansion in terms of these anisotropy constants allows one to avoid long iterative computing. Application of this method to Nd 2 Fe 14 B results in an excellent description of the complex magnetic behavior of this compound.
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Cadogan et al. (1988) studied this question.
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