Berlin 2018 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 47: Poster Session II
MM 47.5: Poster
Mittwoch, 14. März 2018, 18:30–19:45, Poster C
Magnetic short range order in Fe1-xCrx alloys — Isabelle Mirebeau1, •Veronique Pierron-Bohnes2, and Georges Parette1 — 1Laboratoire Léon Brillouin, CEA-CNRS, Université Paris-Saclay, CEA-Saclay, F-91191 Gif-sur-Yvette, France — 2Université de Strasbourg, CNRS, UMR7540 Institut de Physique et Chimie des Matériaux de Strasbourg, 23 rue du Loess BP 43, 67034 Strasbourg Cedex 2 France
The FeCr alloys encounter recently a renewed interest as they eliminate irradiation damages spontaneously. This could be due to a unique inversion of atomic short range order (SRO) at xc=0.11 [1]: they tend to order below xc and to cluster above xc.
In FeCr, a coupling of the ordering and magnetic local orders can also be suspected. We have studied Fe1-xCrx solid solutions (for 0.03<x<0.15), by magnetic neutron diffuse scattering, using both polarized and unpolarized neutrons. The alloys were annealed to ensure equilibrium SRO states. At low Cr content, the Cr moments orient anti-parallel to the Fe moments and perturb the neighboring Fe moments, decreasing their magnitude in the first two nearest neighbor shells and increasing it in the 4-5 neighbor shell.
These results are compared with previous ab initio predictions concerning the amplitude and sign of the local moments and perturbations.
[1] I. Mirebeau and G. Parette, Phys. Rev. B 82, 104203 (2010).