High-Field Study of Strong Magnetoelectric Coupling in Single-Domain Crystals of BiFeO3
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概要
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Magnetic and dielectric properties of single-domain crystals of BiFeO3 were studied in pulsed magnetic fields up to 55 T. At low temperatures, metamagnetic transitions accompanied with sharp changes in electric polarization ($P$) were observed at around 18 T. The angular dependence of the transition field coincides with that of the transition from the cycloidal state to the canted antiferromagnetic spin state studied in the framework of the Landau–Ginzburg theory incorporated with the Lifshitz-like invariant. The parasitic $P$ component caused by the cycloidal spin structure amounts to $210\pm 30$ μC/m2 in terms of the projected component on the pseudocubic principal axis, which can be controlled by applying magnetic fields at least up to 500 K. This result indicates that the microscopic magnetoelectric coupling in BiFeO3 is not weak: In fact, it is rather strong as compared to that in the canonical multiferroic material TbMnO3.
- 2010-06-15
著者
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Azuma Masaki
Institute For Chemical Research Kyoto University
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Shimakawa Yuichi
Institute For Chemical Research Kyoto University
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TOKUNAGA Masashi
The Institute for Solid State Physics (ISSP), The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
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Masashi Tokunaga
The Institute for Solid State Physics, The University of Tokyo, Kashiwa, Chiba 277-8581, Japan
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Yuichi Shimakawa
Institute for Chemical Research, Kyoto University, Kyoto 611-0011, Japan
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