%0 Journal Article
%K Spectroscopy
%K Oxygen
%K Manganese oxide
%K Heterostructures
%K Manganese
%K Ferromagnetism
%K Exchange bias
%K Ferromagnetic materials
%K Antiferromagnets
%K Dichroism
%K X-ray magnetic circular dichroism
%K Oxygen K-edge
%K Ferromagnetic state
%K Ferromagnets
%K Magnetic state
%K Electronic orbitals
%K Ferromagnetic spin
%K Linearly polarized
%A P Yu
%A J.-S Lee
%A S Okamoto
%A M.D Rossell
%A M Huijben
%A C.-H Yang
%A Q He
%A J.X Zhang
%A S.Y Yang
%A M.J Lee
%A Q.M Ramasse
%A R Erni
%A Y.-H Chu
%A D.A Arena
%A C.-C Kao
%A L.W Martin
%A Ramamoorthy Ramesh
%B Physical Review Letters
%D 2010
%G eng
%R 10.1103/PhysRevLett.105.027201
%T Interface ferromagnetism and orbital reconstruction in BiFeO 3-La0.7Sr0.3MnO3 heterostructures
%V 105
%X We report the formation of a novel ferromagnetic state in the antiferromagnet BiFeO3 at the interface with ferromagnet La0.7Sr0.3MnO3. Using x-ray magnetic circular dichroism at Mn and Fe L2,3 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. © 2010 The American Physical Society.