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.
@article{arxiv.1006.1194,
title = {Interface ferromagnetism and orbital reconstruction in BiFeO3- La0.7Sr0.3MnO3 heterostructures},
author = {P. Yu and J. -S. Lee and S. Okamoto and M. D. Rossell and M. Huijben and C. -H. Yang and Q. He and J. -X. Zhang and S. Y. Yang and M. J. Lee and Q. M. Ramasse and R. Erni and Y. -H. Chu and D. A. Arena and C. -C. Kao and L. W. Martin and R. Ramesh},
journal= {arXiv preprint arXiv:1006.1194},
year = {2015}
}