Temperature Mössbauer study of the spatial spin-modulated structure in the multiferroic BiFeO3
Lomonosov Moscow State University, 119991 Moscow, Russia
2 Moscow Technological University (MIREA), 119454 Moscow, Russia
* Corresponding author: email@example.com
Published online: 4 July 2018
57Fe Mössbauer detailed study of the spatial spin-modulated structure of the multiferroic BiFeO3 was carried out in a wide temperature range including the temperature of magnetic phase transition. The Mossbauer spectra have been analysed by fitting in terms of the anharmonic spin cycloid mode. It is established that at temperatures below ~330 K a magnetic anisotropy of the "easy axis" type is realized and above is the magnetic anisotropy of the "easy plane" type. An explanation for the change in the type of magnetic anisotropy is proposed, based on taking into account the different temperature dependences of the two contributions to the effective uniaxial magnetic anisotropy constant: a crystal anisotropy of net antiferromagnet and a weak ferromagnetism.
© The Authors, published by EDP Sciences, 2018
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