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A melt-spinning technique was used to produce TE–TL alloy ribbons with TE = Zr and Hf and TL = Fe, Co or Ni for compositions around the TL-rich eutectic (about 90 at.% TL content). In this part of a series of papers on these alloys, experimental results on the low-temperature magnetic properties of the Zr–Fe and Zr–Ni ribbons will be given. The ac susceptibility ( χ  ac ) data on the amorphous Zr–Fe alloys indicated the onset of magnetic ordering at  T  c  ≈ 200 K and the occurrence of a second magnetic transition at  T  f  ≈ 70 K. It was also found that hydrogenation changed both the Curie temperature  T  c  and the temperature  T  f  in the same sense as an increase of the Zr content. Furthermore, it could be established from  χ  ac  measurements that there is a considerable spatial redistribution of hydrogen within these samples during a period of up to two weeks after hydrogenation by electrolysis. The Curie points of the amorphous and bcc phase of the Zr 9 Ni 91  alloy were practically the same and much smaller than the previous reported values of amorphous alloys of similar compositions. The critical concentration for the onset of magnetic ordering in the Zr–Ni system was found to be around 89 at.% Ni.

Preparation, Structure and Physical Properties of Fe-, Co- and Ni-rich Melt-quenched Ribbons Containing Zr or Hf: Part III: Magnetic Properties