Giant Spin-Driven Ferroelectric Polarization inBiFeO3at Room Temperature | Zendy

Jun Hee Lee | Zendy; R. S. Fishman | Zendy

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Giant Spin-Driven Ferroelectric Polarization inBiFeO3at Room Temperature

Author(s) -

Jun Hee Lee,

R. S. Fishman

Publication year - 2015

Publication title -

physical review letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.688

H-Index - 673

eISSN - 1079-7114

pISSN - 0031-9007

DOI - 10.1103/physrevlett.115.207203

Subject(s) - multiferroics , ferroelectricity , physics , condensed matter physics , polarization (electrochemistry) , point reflection , octahedron , quantum mechanics , dielectric , ion , chemistry

The spin-driven polarizations of type-I multiferroics are veiled by the preexisting ferroelectric (FE) polarization. Using first-principles calculations combined with a spin model, we uncover two hidden but huge spin-driven polarizations in the room-temperature multiferroic BiFeO3. One is associated with the global inversion symmetry broken by a FE distortion, and the other is associated with the local inversion symmetry broken by an antiferrodistortive octahedral rotation. Comparison with recent neutron scatterings reveals tha first polarization reaches similar to 3.0 mu C/cm(2), which is larger than in any other multiferroic material. Our exhaustive study paves a way to uncover the various magnetoelectric couplings that generate hidden spin-driven polarizations in other type-I multiferroics.clos

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