Electric-field-induced spin flop in BiFeO3 single crystals at room temperature |
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Authors: | Lebeugle D Colson D Forget A Viret M Bataille A M Gukasov A |
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Institution: | Service de Physique de l'Etat Condensé, DSM/IRAMIS, CEA Saclay, F-91191 Gif-Sur-Yvette, France. |
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Abstract: | Bismuth ferrite, BiFeO3, is the only known room-temperature magnetic ferroelectric material. We demonstrate here, using neutron scattering measurements in high quality single crystals, that the antiferromagnetic and ferroelectric order parameters are intimately coupled. Initially in a single ferroelectric state, our crystals have a canted antiferromagnetic structure describing a unique cycloid. Under electrical poling, polarization reorientation induces a spin flop. We argue here that the coupling between the two orders may be stronger in the bulk than in thin films where the cycloid is absent. |
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