Temperature Mössbauer study of the spatial spin-modulated structure in the multiferroic BiFeO3

Vyacheslav Rusakov; Vyacheslav Pokatilov; Alexander Sigov; Mikhail Matsnev; Alexander Pyatakov

doi:10.1051/epjconf/201818507010

Proceedings

Open Access

EPJ Web of Conferences 185, 07010 (2018)
https://doi.org/10.1051/epjconf/201818507010

Temperature Mössbauer study of the spatial spin-modulated structure in the multiferroic BiFeO₃

Vyacheslav Rusakov¹^*, Vyacheslav Pokatilov², Alexander Sigov², Mikhail Matsnev¹ and Alexander Pyatakov¹

¹ Lomonosov Moscow State University, 119991 Moscow, Russia
² Moscow Technological University (MIREA), 119454 Moscow, Russia

^* Corresponding author: rusakov@phys.msu.ru

Published online: 4 July 2018

Abstract

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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