Publication Type:Journal Article
Source:Physical Review Letters, Volume 105, Number 2 (2010)
Keywords:Antiferromagnets, Dichroism, Electronic orbitals, exchange bias, Ferromagnetic materials, Ferromagnetic spin, Ferromagnetic state, Ferromagnetism, Ferromagnets, heterostructures, Linearly polarized, Magnetic state, Manganese, Manganese oxide, oxygen, Oxygen K-edge, spectroscopy, X-ray magnetic circular dichroism
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. © 2010 The American Physical Society.
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