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

Journal Article · Fri Jan 01 00:00:00 EST 2010 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.105.027201· OSTI ID:983135

Yu, P ^[1]; Lee, J. -S. ^[2]; Okamoto, Satoshi ^[3]; Rossell, M. D. ^[4]; Huijben, M. ^[5]; Yang, C. -H. ^[1]; He, Q ^[1]; Zhang, J. -X. ^[1]; Yang, S. Y. ^[1]; Lee, M. J. ^[1]; Ramasse, Q. M. ^[4]; Erni, R. ^[4]; Chu, Y. -H. ^[6]; Arena, D. A. ^[2]; Kao, C. -C. ^[2]; Martin, L. W. ^[4]; Ramesh, R ^[4]

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1. University of California, Berkeley
2. Brookhaven National Laboratory (BNL)
3. ORNL
4. Lawrence Berkeley National Laboratory (LBNL)
5. University of California, Berkeley, and University of Twente
6. National Chiao Tung University, Hsinchu, Taiwan

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.

• Research Organization: Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
• Sponsoring Organization: USDOE Office of Science (SC)
• DOE Contract Number: DE-AC05-00OR22725
• OSTI ID: 983135
• Journal Information: Physical Review Letters, Vol. 105, Issue 2; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
ABSORPTION
FERROMAGNETISM
MAGNETIC CIRCULAR DICHROISM
OXYGEN
SPIN