The Magnetic Inhomogeneous Structure of Fe65Ni35 Alloy by Means of Polarized Neutron Small-Angle Scattering

To test a model for the magnetically inhomogeneous structure in Fe65Ni35 invar alloys, according to which paramagnetic clusters are formed in Fe-rich regions, a polarized neutron scattering device was used to measure the polarized neutron small-angle scattering in natural (Fe65^natNi35) and isotopic (Fe65⁶²Ni35) samples. Measured deviations from average scattering amplitude densities coincided with values predicted on the basis of the model, and provided information on the shapes of the paramagnetic clusters.