Abstract
Magnetization studies were performed on amorphous Ni 100− x P x alloys with 15 ≤ x ≤ 23 in the temperature range from 4.2 to 300 K and in fields up to 9 kOe. Samples with x < 17 were prepared by electrodeposition, whereas samples with x ≥ 17 were obtained by either electrodeposition or melt-quenching. The conduction electron susceptibility of the latter samples showed to be independent of the preparation method. Furthermore, the magnetic behaviour was found to differ strongly for x ≤ 17 and x ≥ 17. These different magnetic properties are attributed to a change in the size and behaviour of the magnetic inhomogeneities embedded in the NiP matrix: for x ≥ 17, they can be described as giant-moment paramagnetic clusters, whereas for x ≤ 17 they form superparamagnetic particles.
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