Interface Ferromagnetism and Orbital Reconstruction in BiFeO3-La0.7Sr0.3MnO3 Heterostructures


Yu, P. and Lee, J.-S. and Okamoto, S. and Rossell, M.D. and Huijben, M. and Yang, C.H. and He, Q. and Zhang, J.X. and Yang, S.Y. and Lee, M.J. and Ramasse, Q.M. and Emi, R. and Chu, Y.-H. and Arena, D.A. and Kao, C.C. and Martin, L.W. and Ramesh, R. (2010) Interface Ferromagnetism and Orbital Reconstruction in BiFeO3-La0.7Sr0.3MnO3 Heterostructures. Physical Review Letters, 105 (2). 027201. ISSN 0031-9007

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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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Copyright:© 2010 The American Physical Society
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