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##### Magnetic properties of a nanocrystalline sigma-FeCr alloy

**Authors**: J. Cieslak, B.F.O. Costa, S.M. Dubiel, M. Reissner and W. Steiner

**Ref.**: Journal of Physics: Condensed Matter **17**, 2985-2992 (2005)

**Abstract**: Magnetic properties of a nanocrystalline σ-Fe55.4Cr44.6 alloy were investigated by means of Mossbauer spectroscopy and vibrating sample magnetometry both as a function of temperature (4 K &LE; T &LE; 300 K) and, for the latter, also as a function of external magnetic field (B-a &LE; 15 T). The methods used enabled us to determine the mean Curie temperature, (T-C) 57 K, and the average magnetic moment per Fe atom, (μ) = 0.34 μ(B), as well as to find that the sample behaves like an ensemble of interacting superparamagnetic particles. Comparison of these results with our recent corresponding investigations on microcrystalline σ-Fe100-xCrx alloys with 45 &LE; x &LE; 50 shows that the ratio between the average hyperfine field, (B), and (A) for the nanocrystalline sample fits well to that of the microcrystalline ones of similar composition. The nonlinear (B)-(μ) relationship points to composition-dependent valence hyperfine field contributions.