Electric-field-induced spin-flop in BiFeO3 single crystals at room-temperature

Abstract

Bismuth ferrite, BiFeO3, is the only known room-temperature 'multiferroic' material. We demonstrate here, using neutron scattering measurements in high quality single crystals, that the antiferromagnetic and ferroelectric orders are intimately coupled. Initially in a single ferroelectric state, our crystals have a canted antiferromagnetic structure describing a unique cycloid. Under electrical poling, polarisation re-orientation induces a spin flop. We argue here that the coupling between the two orders may be stronger in the bulk than that observed in thin films where the cycloid is absent.

References in corpus (8)

• Spin current and magneto-electric effect in non-collinear magnets
• Ferroelectricity in spiral magnets
• Role of the Dzyaloshinskii-Moriya interaction in multiferroic perovskites
• Very large spontaneous electric polarization in BiFeO3 single crystals at room temperature and its evolution under cycling fields
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• Influence of parasitic phases on the properties of BiFeO3 epitaxial thin films
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