Magnetic form factor of Ni-Pt alloy system with 8.5, 24, 32 and 46 at.% Pt was measured by means of the polarized neutron diffraction. The form factors were analyzed with the results that the atomic magnetic moment of Ni atom decreases with increasing Pt concentration and that of Pt atom has parallel magnetic moment. Experimental results were explained by a Coherent Potential Approximation. In the vicinity of the critical concentration for ferromagnetism, the partial state densities of Ni and Pt atom in the Ni-Pt alloy were calculated to be almost the same with each other, while the partial state densities of Ni and Pd atom in the Ni-Pd alloy turned out to be quite different.
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Nakai et al. (1979) studied this question.
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