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Neutrons have different scattering cross-sections for the isotopes of an element. Also, they interact with the un-paired electrons in a magnetic sample due to their magnetic moment. Neutron reflectivity or reflectometry is a technique which measures the depth profile of a sample. Using polarized neutrons, both self-diffusion and magnetism can be probed in a unique way. In the present work, polarized neutron reflectometry measurements were performed in [FePt/(FePt)-Fe-57] multilayers across the structural ordering temperature of this sample. It was found that the structural ordering in this system is concurrent with a sudden increase in Fe diffusivity and a sudden drop in the value of the magnetic moment

Ordering and self-diffusion in FePt alloy film