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• W3100551251 endingPage "275803" @default.
• W3100551251 startingPage "275803" @default.
• W3100551251 abstract "We report new results of a 57Fe Mossbauer study of multiferroic 3R-AgFeO2 powder samples performed in a wide temperature range, including two points, TN1 ~ 14 K and TN2 ~ 9 K, of magnetic phase transitions. At the intermediate temperature range, TN2 < T < TN1, the 57Fe Mossbauer spectra can be described in terms of collinear spin-density-waves (SDW) with the inclusion of many high-order harmonics, indicating that the real magnetic structure of this ferrite appears to be more complicated than a pure sinusoidally modulated SDW. The spectra at low temperatures, T < TN2, consist of a Zeeman pattern with line broadenings and sizeable spectral asymmetry. It has been shown that the observed spectral shape is consistent with a transition to the elliptical cycloidal magnetic structure. An analysis of the experimental spectra was carried out under the assumption that the electric hyperfine interactions are modulated when the Fe3+ magnetic moment rotates with respect to the principal axis of the EFG tensor and emergence of the strong anisotropy of the magnetic hyperfine field Hhf at the 57Fe nuclei. The large and temperature-independent anharmonicity parameter, m ~ 0.78, of the cycloidal spin structure obtained from the experimental spectra results from easy-axis anisotropy in the plane of rotation of the iron spin. Analysis of different mechanisms of spin and hyperfine interactions in 3R-AgFeO2 and its structural analogue CuFeO2 points to a specific role played by the topology of the exchange coupling and the oxygen polarization in the delafossite structures." @default.
• W3100551251 created "2020-11-23" @default.
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• W3100551251 date "2017-06-07" @default.
• W3100551251 modified "2023-09-24" @default.
• W3100551251 title "⁵⁷Fe Mössbauer study of unusual magnetic structure of multiferroic 3<i>R</i>-AgFeO₂" @default.
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• W3100551251 doi "https://doi.org/10.1088/1361-648x/aa70ae" @default.
• W3100551251 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/28466826" @default.
• W3100551251 hasPublicationYear "2017" @default.
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