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Negative magnetostrictive magnetoelectric coupling of BiFeO3

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arxiv 1307.1519 v2 pith:F2XRJP4W submitted 2013-07-05 cond-mat.str-el cond-mat.mtrl-sci

Negative magnetostrictive magnetoelectric coupling of BiFeO3

Sanghyun Lee , M. T. Fernandez-Diaz , H. Kimura , Y. Noda , D. T. Adroja , Seongsu Lee , Junghwan Park , V. Kiryukhin
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S-W. Cheong M. Mostovoy Je-Geun Park
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classification cond-mat.str-el cond-mat.mtrl-sci
keywords couplingmagnetoelectricbifeo3electricmagnetostrictivenegativepolarizationspin
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How the magnetoelectric coupling actually occurs on a microscopic level in multiferroic BiFeO3 is not well known. By using the high-resolution single crystal neutron diffraction techniques, we have determined the electric polarization of each individual elements of BiFeO3, and concluded that the magnetostrictive coupling suppresses the electric polarization at the Fe site below TN. This negative magnetoelectric coupling appears to outweigh the spin current contributions arising from the cycloid spin structure, which should produce a positive magnetoelectric coupling.

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