Abstract
We have measured Mn K-edge magnetic EXAFS for Ni0.76Mn0.24 alloy. The 2nd peaks in the Fourier transform attributed to Mn-Mn pairs in the ordered phase are enhanced in comparison with those in non-magnetic EXAFS. This result suggests that some Ni atoms in the 2nd shell are replaced by Mn atoms, which have large magnetic moment in comparison with Ni atoms, due to heat-treatment induced atomic ordering. Semi-relativistic theoretical calculations well explain the observed magnetic EXAFS. We estimate the ratio of the magnetic moments of Ni to Mn atom in Ni-Mn alloy, within a single scattering limit.
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