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The results of magnetic measurements performed on ZrCo5.1−xFex alloys in the temperature range 4.2–900 K and fields up to 7 T are reported. The presence of solid solutions is evidenced in the composition range x<0.9. The Curie temperature and the saturation magnetization increase nearly linearly when cobalt is substituted by iron. In addition, the anisotropy field decreases and shows an unusual temperature dependence, with a maximum at T≂300 K.

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Magnetization processes in melt spun and sintered Nd-Fe-B-permanent magnets are significantly different because of their distinct grain size. We deduce from magnetization measurements on randomly oriented material that in melt spun Nd-FeB the homogeneous rotation of magnetization plays an important role in the whole field range, while for sintered magnets after thermal demagnetization an easy domain wall movement is the predominant process.