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Interface ferromagnetism and orbital reconstruction in BiFeO3- La0.7Sr0.3MnO3 heterostructures

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arxiv 1006.1194 v1 pith:VYJ4JSUK submitted 2010-06-07 cond-mat.mtrl-sci

Interface ferromagnetism and orbital reconstruction in BiFeO3- La0.7Sr0.3MnO3 heterostructures

P. Yu , J. -S. Lee , S. Okamoto , M. D. Rossell , M. Huijben , C. -H. Yang , Q. He , J. -X. Zhang
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S. Y. Yang M. J. Lee Q. M. Ramasse R. Erni Y.-H. Chu D. A. Arena C. -C. Kao L. W. Martin R. Ramesh
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classification cond-mat.mtrl-sci
keywords interfaceferromagneticmagneticmno3orbitalreconstructionstatex-ray
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We report the formation of a novel ferromagnetic state in the antiferromagnet BiFeO3 at the interface with 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 with an electronic orbital reconstruction at the interface, which is supported by the linearly polarized x-ray absorption measurement at oxygen K-edge.

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