Interface ferromagnetism and orbital reconstruction in BiFeO3-La(0.7)Sr(0.3)MnO3 heterostructures.
We report the formation of a novel ferromagnetic state in the antiferromagnet BiFeO3 at the interface with ferromagnet La(0.7)Sr(0.3)MnO3. Using x-ray magnetic circular dichroism at Mn and Fe L(2,3) 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.
Yu
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P
Department of Physics, University of California, Berkeley, California 94720, USA. pyu@lbl.gov
Lee
J-S
JS
Okamoto
S
S
Rossell
M D
MD
Huijben
M
M
Yang
C-H
CH
He
Q
Q
Zhang
J X
JX
Yang
S Y
SY
Lee
M J
MJ
Ramasse
Q M
QM
Erni
R
R
Chu
Y-H
YH
Arena
D A
DA
Kao
C-C
CC
Martin
L W
LW
Ramesh
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R