Local magnetic moments andg′in Fe-Ni alloys

This paper presents a local-model calculation of the composition dependence of $g^{\prime }$, the effective magnetomechanical ratio, for Fe-Ni alloys. The model incorporates magnetic moments from scattering experiments as well as Einstein-de Haas measurements of $g^{\prime }$ for pure Fe and pure Ni. Excellent agreement is obtained with Scott's room-temperature $g^{\prime }$ values on slow-cooled alloy samples. This good agreement supports the assumption that the local atomic $g^{\prime }$ value does not change upon alloying, while the local magnetic moment does. Estimates of the first short-range order parameter are obtained. These are all found to be zero or negative, and to be small in absolute magnitude.