Abstract
A neutron scattering study of polycrystalline γ-FecMn1-c alloys, with c = 0.671, 0.595, 0.529 and 0.414, is reported. Neutron diffraction at 295 and 77 K indicates an average magnetic moment which increases approximately linearly with iron concentration, in agreement with previous results. Nuclear and magnetic diffuse scattering cross-sections were measured using time-of-flight spectroscopy, to isolate the elastic contributions, and polarization analysis to separate the nuclear and magnetic components. In our analysis, based on a linear model of atomic and magnetic defects at nearest neighbour sites we find no significant atomic short range order and small magnetic moment defects (≈ 0.2μB/atom) at nearest neighbour sites. In this concentration range the iron site magnetic moments are small (<1μB/atom), compared to the manganese site magnetic moments (>2μB/atom). Magnetic moments at both sites increase with Fe concentration.
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