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
TL;DR
This study reveals a new ferromagnetic state at the interface of BiFeO3 and La0.7Sr0.3MnO3, linked to orbital reconstruction and exchange bias, advancing understanding of interface magnetism in heterostructures.
Contribution
It demonstrates the formation of interface ferromagnetism in BiFeO3-La0.7Sr0.3MnO3 heterostructures and links it to orbital reconstruction and exchange bias effects.
Findings
Discovery of a ferromagnetic state at the interface
Correlation between ferromagnetism and orbital reconstruction
Observation of exchange bias associated with the interface
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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