Local Weak Ferromagnetism in Single-Crystalline Ferroelectric BiFeO3

M. Ramazanoglu, Mark Laver, W. Ratcliff, S.M. Watson, W.C. Chen, A. Jackson, K. Kothapalli, S. Lee, S.-W. Cheong, V. Kiryukhin

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    Abstract

    Polarized small-angle neutron scattering studies of single-crystalline multiferroic BiFeO3 reveal a long-wavelength spin density wave generated by ∼1° spin canting of the spins out of the rotation plane of the antiferromagnetic cycloidal order. This signifies weak ferromagnetism within mesoscopic regions of dimension 0.03 microns along [11̅ 0], to several microns along [111], confirming a long-standing theoretical prediction. The average local magnetization is 0.06  μB/Fe. Our results provide an indication of the intrinsic macroscopic magnetization to be expected in ferroelectric BiFeO3 thin films under strain, where the magnetic cycloid is suppressed.
    Original languageEnglish
    JournalPhysical Review Letters
    Volume107
    Issue number20
    Pages (from-to)207206-1/207206-5
    ISSN0031-9007
    DOIs
    Publication statusPublished - 2011

    Keywords

    • Bismuth ferrite
    • Physics
    • Multiferroic bifeo3
    • Thin-film heterostructures
    • Room-temperature

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