Interface Ferromagnetism and Orbital Reconstruction in BiFeO3-La0.7Sr0.3MnO3 Heterostructures

被引：353

作者：

Yu, P. ^{[1
,2
]}

Lee, J. -S. ^{[3
]}

Okamoto, S. ^{[4
]}

Rossell, M. D. ^{[5
]}

Huijben, M. ^{[1
,2
,6
]}

Yang, C. -H. ^{[1
,2
]}

He, Q. ^{[1
,2
]}

Zhang, J. X. ^{[1
,2
]}

Yang, S. Y. ^{[1
,2
]}

Lee, M. J. ^{[1
,2
]}

Ramasse, Q. M. ^{[5
]}

Erni, R. ^{[5
]}

Chu, Y. -H. ^{[7
]}

Arena, D. A. ^{[3
]}

Kao, C. -C. ^{[3
]}

Martin, L. W. ^{[8
,9
]}

Ramesh, R. ^{[1
,2
,8
]}

机构：

[1] Univ Calif Berkeley, Dept Phys, Berkeley, CA 94720 USA

[2] Univ Calif Berkeley, Dept Mat Sci & Engn, Berkeley, CA 94720 USA

[3] Brookhaven Natl Lab, Natl Synchrotron Light Source, Upton, NY 11973 USA

[4] Oak Ridge Natl Lab, Div Mat Sci & Technol, Oak Ridge, TN 37831 USA

[5] Univ Calif Berkeley, Lawrence Berkeley Lab, Natl Ctr Electron Microscopy, Berkeley, CA 94720 USA

[6] Univ Twente, Fac Sci & Technol, MSEA Inst Nanotechnol, NL-7500 AE Enschede, Netherlands

[7] Natl Chiao Tung Univ, Dept Mat Sci & Engn, Hsinchu 30010, Taiwan

[8] Univ Calif Berkeley, Lawrence Berkeley Lab, Div Mat Sci, Berkeley, CA 94720 USA

[9] Univ Illinois, Dept Mat Sci & Engn, Urbana, IL 61801 USA

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 105卷 / 02期

关键词：

MAGNETIC CIRCULAR-DICHROISM; EXCHANGE BIAS; MULTIFERROICS;

D O I：

10.1103/PhysRevLett.105.027201

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

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 L-2,L-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.

引用

页数：5

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