title: Local weak ferromagnetism in single-crystalline ferroelectric BiFeO3.
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.
authors.affiliation: Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854, USA.
authors.forename: M
authors.initials: M
authors.lastname: Ramazanoglu
authors.forename: M
authors.initials: M
authors.lastname: Laver
authors.forename: W
authors.initials: W
authors.lastname: Ratcliff
authors.forename: S M
authors.initials: SM
authors.lastname: Watson
authors.forename: W C
authors.initials: WC
authors.lastname: Chen
authors.forename: A
authors.initials: A
authors.lastname: Jackson
authors.forename: K
authors.initials: K
authors.lastname: Kothapalli
authors.forename: Seongsu
authors.initials: S
authors.lastname: Lee
authors.forename: S-W
authors.initials: SW
authors.lastname: Cheong
authors.forename: V
authors.initials: V
authors.lastname: Kiryukhin