A phenomenological theory of strongly paramagnetic and weakly ferromagnetic dilute alloys

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Abstract
An earlier calculation based on the generalized Landau theory of phase transitions is extended to cover the ferromagnetic regime where the Landau coefficient B has to be included. The theory is applied to dilute Pd-Ni alloys. Contrary to the earlier calculation, nearest neighbour pairs of nickel atoms in a matrix consisting of palladium and single nickel impurities are considered. The Landau equation is solved to give the dependence of the magnetization M on external field (Arrott plots) and on the spatial position relative to the impurities. The agreement of the Arrott plots with those observed is good.