title: Interface ferromagnetism and orbital reconstruction in BiFeO3-La(0.7)Sr(0.3)MnO3 heterostructures.
abstract: We report the formation of a novel ferromagnetic state in the antiferromagnet BiFeO3 at the interface with ferromagnet La(0.7)Sr(0.3)MnO3. Using x-ray magnetic circular dichroism at Mn and Fe L(2,3) edges, we discovered that the development of this ferromagnetic spin structure is strongly associated with the onset of a significant exchange bias. Our results demonstrate that the magnetic state is directly related to an electronic orbital reconstruction at the interface, which is supported by the linearly polarized x-ray absorption measurement at the oxygen K edge.
authors.affiliation: Department of Physics, University of California, Berkeley, California 94720, USA. pyu@lbl.gov
authors.forename: P
authors.initials: P
authors.lastname: Yu
authors.forename: J-S
authors.initials: JS
authors.lastname: Lee
authors.forename: S
authors.initials: S
authors.lastname: Okamoto
authors.forename: M D
authors.initials: MD
authors.lastname: Rossell
authors.forename: M
authors.initials: M
authors.lastname: Huijben
authors.forename: C-H
authors.initials: CH
authors.lastname: Yang
authors.forename: Q
authors.initials: Q
authors.lastname: He
authors.forename: J X
authors.initials: JX
authors.lastname: Zhang
authors.forename: S Y
authors.initials: SY
authors.lastname: Yang
authors.forename: M J
authors.initials: MJ
authors.lastname: Lee
authors.forename: Q M
authors.initials: QM
authors.lastname: Ramasse
authors.forename: R
authors.initials: R
authors.lastname: Erni
authors.forename: Y-H
authors.initials: YH
authors.lastname: Chu
authors.forename: D A
authors.initials: DA
authors.lastname: Arena
authors.forename: C-C
authors.initials: CC
authors.lastname: Kao
authors.forename: L W
authors.initials: LW
authors.lastname: Martin
authors.forename: R
authors.initials: R
authors.lastname: Ramesh