Rare Earth-Transition Metal Magnetostrictive Materials
AMERICAN UNIV WASHINGTON DC DEPT OF PHYSICS
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There are three basic models of an amorphous ferromagnet. Gubanov suggested very early that the amorphous ferromagnet is characterized by a distribution of exchange interactions. This plausible assumption has been pursued by a number of groups. Another view is that the exchange is uniform, but that the large single ion anisotropy is distributed uniformly in directions of easy axis over the unit sphere. Still a third approach, the collective electron model, is one we introduced and continue to work on. It is probably the right model for amorphous nickel, an intinerant ferromagnet in its crystalline phase, but is surely not descriptive of the rare earths. For the rare earth alloys neither the exchange nor the crystal field models have been carried to such agreement with experiment as to exclude the other from consideration, and there may be room for the both models in describing different materials. The quadrupole splitting in an amorphous material is the same as it is in the crystalling phase.
- Electricity and Magnetism