Local weak ferromagnetism in single-crystalline ferroelectric BiFeO3 |
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Authors: | Ramazanoglu M Laver M Ratcliff W Watson S M Chen W C Jackson A Kothapalli K Lee Seongsu Cheong S-W Kiryukhin V |
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Institution: | Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA. |
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Abstract: | Polarized small-angle neutron scattering studies of single-crystalline multiferroic BiFeO(3) 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 110], to several microns along 111], confirming a long-standing theoretical prediction. The average local magnetization is 0.06 μ(B)/Fe. Our results provide an indication of the intrinsic macroscopic magnetization to be expected in ferroelectric BiFeO(3) thin films under strain, where the magnetic cycloid is suppressed. |
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