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The magnetization of quenched Cu0.9Ni0.1 and Cu0.8Ni0.2 alloys containing 100 to 1000 ppm Fe can be quantitatively accounted for in terms of magnetic clusters of 1, 2, and 3 or more Fe moments together with the moments of associated Ni nearest neighbors. The ratio of the measured concentration of the Fe pair clusters to that of single Fe clusters is at all Ni and Fe concentrations much higher than the corresponding ratio calculated on the basis of a random alloy model. The correct interpretation is that the Fe moments forming Fe pairs or larger magnetic clusters are nearest neighbors of one another and that deviations from randomness account for the observed concentration of Fe pair and larger clusters. The Fe–Fe nearest neighbor short range order parameter, as determined from the magnetic data, increases with increasing Fe concentration and with decreasing Ni content.

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An improved version of the moment assignments to Ni will be discussed for various nearest and second-nearest neighbour configurations in Ni-Cu alloys, using revised short range order parameters and new saturation magnetization data for ferromagnetic and superparamagnetic high purity Cu-Ni alloys near the critical composition. Using magnetization vs. field data at various temperatures for ferromagnetic and superparamagnetic HCP solid solutions of Co and Re, the moment assignments to Co will be discussed as a function of the nearest neighbour atomic environment

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