BiFeO3 (BFO) films were prepared by nebulized spray pyrolysis technique on a single crystal LaAlO3 (001) substrate at 300°C and annealing in oxygen at 550°C for 1 h. In all films BFO is the majority phase having a rhombohedrally distorted structure with R3m symmetry and lattice parameters are a=3.96Å and α=89.7°. Atomic force microscopy reveals smooth and dense surface morphology. Despite the G-type antiferromagnetic spin structure of BFO the present BFO show well-defined M-H loops and unexpected ferromagnetism as evidenced by large saturation magnetization, 125emu/cc. The origin of anomalous ferromagnetism in the present films has been traced to the presence of nanometric Fe2O3 embedded in the BFO matrix.

1.
W.
Prellier
,
M. P.
Singh
, and
P.
Murugavel
,
J. Phys.: Condens. Matter
17
,
7753
(
2005
).
2.
N. A.
Hill
,
J. Phys. Chem. B
104
,
6694
(
2000
).
3.
W.
Eerenstein
,
N. D.
Mathur
, and
J.
Scott
,
Nature (London)
44
,
759
(
2004
).
4.
R.
Ramesh
and
N. A.
Spaldin
,
Nature Mater.
6
,
21
(
2007
).
6.
C.
Ederer
and
N. A.
Spaldin
,
Phys. Rev. B
71
,
060401
(
2005
).
7.
R. R.
Das
 et al,
Appl. Phys. Lett.
88
,
242904
(
2006
).
8.
Y.
Wang
,
Q.
Jiang
,
H.
He
, and
C.
Nan
,
Appl. Phys. Lett.
88
,
142503
(
2006
).
9.
S. K.
Singh
,
Y. K.
Kim
,
H.
Funakubo
, and
H.
Ishiwara
,
Appl. Phys. Lett.
88
,
162904
(
2006
).
10.
J.
Thery
 et al,
Chem. Vap. Deposition
13
,
232
(
2007
).
11.
P. K.
Siwach
 et al,
J. Appl. Phys.
101
,
073912
(
2007
).
12.
P. K.
Siwach
,
H. K.
Singh
,
J.
Singh
, and
O. N.
Srivastava
,
Appl. Phys. Lett.
91
,
122503
(
2007
).
13.
JCPDS Card No. 72-2035.
14.
M.
Murakami
 et al,
Appl. Phys. Lett.
88
,
112505
(
2006
).
15.
H.
Bea
 et al,
Phys. Rev. B
74
,
020101
(
2006
).
16.
S. H.
Lim
 et al,
Adv. Funct. Mater.
17
,
2594
(
2007
).
You do not currently have access to this content.