Abstract
The magnetization curve of a two-phase two-sublattice model is calculated analytically. In one phase a ferromagnetic coupling is assumed which contributes to the total magnetization whereas in the other phase a ferrimagnetic interaction takes place. Within the framework of a molecular field theory the magnetization curve of this ferrimagnetic phase is calculated assuming a certain distribution of the molecular field interactions. The law of approach to magnetic saturation yields for the leading term a H −1 -dependence in contrast to fluctuations of the local magnetic anisotropy which in general yield a H − built1 2 -law. The calculations of the two-phase two-sublattice model agree well with measurements of the high-field magnetization curve of amorphous Fe 1− x Zr x -alloys with 0.076 ≤ x ≤ 0.11 showing that with decreasing Zr-content an increase of the ferrimagnetic phase exists.
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