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1 2007

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Mössbauer investigations of the magnetic structure of A Fe-Mn

Szymański K., Olszewski W., Satuła D., Dobrzyński L.

Materials Science Poland

2007

Vol. 25, No. 2

363--369

Mössbauer polarimetry was used for investigations of orientations of Fe magnetic moments in a AFe-Mn system. External magnetic field was applied to single crystal samples. Since the hyperfine field is a vector quantity, it forms a vector sum with the external magnetic field, and this quantity obviously depends on the magnetic structure of a system under study. Investigations with various orientations of external magnetic field with respect to the crystalline directions were performed. There is a clear experimental evidence that the distribution of Fe moments is present, which explains the already reported disagreement between simulated and measured results. Shapes of the spectra are best explained under the assumption of a coexistence of Q2 and Q3 structures. Influence of plastic deformation on the distribution of hyperfine fields is reported.