Interface Ferromagnetism and Orbital Reconstruction in BiFeO3La0.7Sr0.3MnO3 Heterostructures

P. Yu, J.-S. Lee, S. Okamoto, M. D. Rossell, M. Huijben, C.-H. Yang, Q. He, J. X. Zhang, S. Y. Yang, M. J. Lee, Q. M. Ramasse, R. Erni, Y.-H. Chu, D. A. Arena, C.-C. Kao, L. W. Martin, and R. Ramesh
Phys. Rev. Lett. 105, 027201 – Published 6 July 2010
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Abstract

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.

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  • Received 15 December 2009

DOI:https://doi.org/10.1103/PhysRevLett.105.027201

©2010 American Physical Society

Authors & Affiliations

P. Yu1,*, J.-S. Lee2, S. Okamoto3, M. D. Rossell4, M. Huijben1,5, C.-H. Yang1, Q. He1, J. X. Zhang1, S. Y. Yang1, M. J. Lee1, Q. M. Ramasse4, R. Erni4, Y.-H. Chu6, D. A. Arena2, C.-C. Kao2, L. W. Martin7,8, and R. Ramesh1,7

  • 1Department of Physics and Department of Materials Science and Engineering, University of California, Berkeley, California 94720, USA
  • 2National Synchrotron Light Source, Brookhaven National Laboratory, Upton, New York 11973, USA
  • 3Materials Science and Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
  • 4National Center for Electron Microscopy, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 5Faculty of Science and Technology, MSEA+ Institute for Nanotechnology, University of Twente, Post Office Box 217, 7500 AE, Enschede, The Netherlands
  • 6Department of Materials Science and Engineering, National Chiao Tung University, Taiwan, 30010
  • 7Materials Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, California 94720, USA
  • 8Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Urbana, Illinois, 61801, USA

  • *pyu@lbl.gov

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Vol. 105, Iss. 2 — 9 July 2010

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