Negative magnetostrictive magnetoelectric coupling of BiFeO3

Abstract

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.

10 pages, 4 figures, Accepted in Phys. Rev. B(Rapid Communications)

References in corpus (7)

• Spin current and magneto-electric effect in non-collinear magnets
• First-principles study of spontaneous polarization in multiferroic BiFeO${}_3$
• Role of the Dzyaloshinskii-Moriya interaction in multiferroic perovskites
• The ferroelectric-paraelectric phase transition in BiFeO3: crystal structure of the orthorhombic beta-phase
• Magnetic dispersion and anisotropy in multiferroic BiFeO3
• Singe ferroelectric and chiral magnetic domain of single-crystalline BiFeO${}_3$ in an electric field
• X-ray imaging and multiferroic coupling of cycloidal magnetic domains in ferroelectric monodomain BiFeO3

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