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arXiv · 1006.1194

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·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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Abstract

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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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, R. Ramesh. 2010-06-07. Interface ferromagnetism and orbital reconstruction in BiFeO3- La0.7Sr0.3MnO3 heterostructures. https://doi.org/10.1103/physrevlett.105.027201

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