Abstract
We have measured the Mn K-edge magnetic EXAFS of Ni 0.75Mn 0.25 alloys prepared by various annealing times. Their second peaks in the Fourier transform attributed to Mn–Mn pairs in the ordered phase are greatly enhanced in comparison with those in conventional EXAFS. This result suggests that some of Ni atoms in the second shell are replaced by Mn atoms, which have large magnetic moment in comparison with Ni atoms, due to heat-treatment-induced atomic ordering. Relativistic theoretical calculations well explain the observed magnetic EXAFS. We estimate the ratio of the magnetic moments of Ni to that of Mn in Ni–Mn alloy, within a single scattering approximation.
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