BiFeO3 thin films have been prepared on PtTiO2SiO2Si substrates under various oxygen pressures of 0.150.005Torr at a temperature of 450°C by pulsed-laser deposition. The effects of deposition pressure on their crystal structure and multiferroic properties have been investigated at room temperature. X-ray diffraction analysis (θ-2θ scans and 2-dimensional scans) shows that the BiFeO3 thin films consist of perovskite single phase with tetragonal crystal structure and space group P4mm. The c-axis lattice constant decreases (4.0624.006Å) and ca ratio of the films decreases from 1.032 to 1.014 with a decrease in the oxygen pressure. The surface roughness and grain size of the films depend dramatically on oxygen pressures. The dielectric constant of the films decreases with decreasing oxygen pressure. The film deposited at 0.05Torr shows a stable current density and well-saturated hysteresis loop with twice the remanent polarization (2Pr) of 136μCcm2 and coercive field (2Ec) of 109kVcm. The BiFeO3 thin films also show the saturated weak ferromagnetic hysteresis loops with a small remanent magnetization.

1.
G. A.
Smolenskii
and
V. M.
Yudin
,
Sov. Phys. JETP
16
,
622
(
1963
).
2.
J.
Wang
 et al,
Science
299
,
1719
(
2003
).
3.
A. S.
Borovik-Romanov
and
V. I.
Ozhogin
,
Sov. Phys. JETP
12
,
18
(
1960
).
4.
N. A.
Hill
and
K. A.
Rabe
,
Phys. Rev. B
59
,
8759
(
1999
).
5.
T.
Kimura
,
T.
Goto
,
H.
Shintani
,
K.
Ishizaka
,
T.
Arima
, and
Y.
Tokura
,
Nature (London)
426
,
55
(
2003
).
6.
K. Y.
Yun
,
M.
Noda
, and
M.
Okuyama
,
Extended Abstracts, The 64th Autumn Meeting 2003
(
The Japan Society of Applied Physics
, Hukuoka,
2003
), p.
487
.
7.
J. G.
Ismilzade
,
Phys. Status Solidi B
46
,
K39
(
1971
).
8.
C.
Michel
,
J. M.
Moreau
,
G. D.
Achenbach
,
R.
Gerson
, and
W. J.
James
,
Solid State Commun.
7
,
701
(
1969
).
9.
J. M.
Moreau
,
C.
Michel
,
R.
Gerson
, and
W. J.
James
,
J. Phys. Chem. Solids
32
,
1315
(
1971
).
10.
J. R.
Teague
,
R.
Gerson
, and
W. J.
James
,
Solid State Commun.
8
,
1073
(
1970
).
11.
S. V.
Kiselev
,
R. P.
Ozerov
, and
G. S.
Zhdanov
,
Sov. Phys. Dokl.
7
,
742
(
1963
).
12.
F.
Kubel
and
H.
Schmid
,
Acta Crystallogr., Sect. B: Struct. Sci.
46
,
698
(
1990
).
13.
K.
Ueda
,
H.
Tabata
, and
T.
Kawai
,
Appl. Phys. Lett.
75
,
555
(
1999
).
14.
J. R.
Cheng
,
N.
Li
, and
E.
Cross
,
J. Appl. Phys.
94
,
5153
(
2003
).
15.
J. S.
Kim
,
C. I.
Cheon
,
Y. N.
Choi
, and
P. W.
Jang
,
J. Appl. Phys.
93
,
9263
(
2003
).
16.
K. Y.
Yun
,
M.
Noda
, and
M.
Okuyama
,
Appl. Phys. Lett.
83
,
3981
(
2003
).
17.
O.
Auciello
and
R.
Ramesh
,
Mater. Res. Bull.
21
,
221
(
1996
).
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