Both the coherent and incoherent scattering of polarised neutrons were measured for a single crystal of the Fe0.70Ni0.30 alloy in the FCC phase. The interest in this alloy comes from the fact that its magnetic moment falls far below the Slater-Pauling curve. A deformation of the spherical part of the form factor was observed. The values of the total magnetic moment, of the spherical magnetic moment (as deduced from the coherent scattering), of the local magnetic moments, and of the variance of the magnetic moment (these two quantities being deduced from the incoherent scattering), all fit together in a model in which the Fe atoms have two different magnetic moments, one large and positive, 2.7 mu B, and the other small and negative, -0.4 mu B. The model appears well able to reproduce the experimental results and the general trend of the concentration dependence of the total and aspherical magnetic moments as obtained by different experiments.
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