Spatial spin-modulated structure and hyperfine interactions of 57Fe nuclei in multiferroics BiFe1–xTxO3 (T = Sc, Mn; x = 0, 0.05)

Abstract

The results of the Mössbauer studies on ⁵⁷Fe nuclei in multiferroics BiFe_1–xT_xO₃ (T = Sc, Mn; x = 0, 0.05) in the temperature range of 5.2–300 K have been presented. The Mössbauer spectra have been analyzed in terms of the model of an incommensurate spatial spin-modulated structure of cycloid type. Information has been obtained about the effect of the substitution of Sc and Mn atoms for Fe atoms on the hyperfine parameters of the spectrum: the shift and the quadrupole shift of the Mössbauer line, the isotropic and anisotropic contributions to the hyperfine magnetic field, and also the parameter of anharmonicity of the spatial spin-modulated structure.