BaFeO3–δ (BFO) thin films are deposited on different MgO single-crystal substrates with (001), (110), and (111) structural orientations and investigated for the structural and magnetic properties. These films show weak ferromagnetism and magnetocrystalline anisotropy, where (111) axis is found to be hard-axis of magnetization. As Ti-doping should reduce oxygen deficiencies, we have studied the effects of Ti-doping on BFO/MgO (001) system. This doping of nonmagnetic Ti4+ ions (with 3d0 orbital) at Fe-site in BaFeO3−δ largely enhances the magnetization at room temperature. After oxygen annealing of the undoped and doped films deposited on MgO (001), the films show further alteration of magnetization and structure depending on Ti-doping. These films either show a pinched magnetic hysteresis at zero field or a larger coercivity, which was otherwise absent in the untreated thin films. Our results reveal that such changes in magnetic hystereses take place due to the magnetocrystalline anisotropy and/or coexisted soft and hard (or less soft) magnetic phases in annealed films. The annealing-induced hard magnetic phase gets completely suppressed by Ti-doping in BFO film.

1.
O.
Gutfleisch
,
M. A.
Willard
,
E.
Brück
,
C. H.
Chen
,
S. G.
Sankar
, and
J.
Ping Liu
,
Adv. Matter.
23
,
821
842
(
2011
).
2.
A.
Goldman
,
Modern Ferrite Technology
, 2nd ed. (
Springer
,
USA
,
2006
).
3.
E. F.
Kneller
and
R.
Hawig
,
IEEE Trans. Mag.
27
(
4
),
3588
3600
(
1991
).
4.
Z.
Wang
,
Y.
Yang
,
R.
Viswan
,
J.
Li
, and
D.
Viehland
,
Appl. Phys. Lett.
99
,
043110
(
2011
).
5.
Y.-S.
Kim
and
S.-C.
Shin
,
Phys. Rev. B
59
(
10
),
R6597
R6600
(
1999
).
6.
H.
Meng
,
W. H.
Lum
,
R.
Sbiaa
,
S. Y. H.
Lua
, and
H. K.
Tan
,
J. Appl. Phys.
110
,
033904
1
(
2011
).
7.
M.
Estrader
,
A.
López-Ortega
,
S.
Estradé
,
I. V.
Golosovsky
,
G.
Salazar-Alvarez
,
M.
Vasilakaki
,
K. N.
Trohidou
,
M.
Varela
,
D. C.
Stanley
,
M.
Sinko
,
M. J.
Pechan
,
D. J.
Keavney
,
F.
Peiró
,
S.
Suriñach
,
M. D.
Baró
, and
J.
Nogués
,
Nat. Commun.
4
,
2960
(
2013
).
8.
L.
Curecheriu
,
P.
Postolache
,
V.
Buscaglia
,
N.
Horchidan
,
M.
Alexe
, and
L.
Mitoseriu
,
Phase Trans.
86
(
7
),
670
680
(
2013
).
9.
E. E.
Fullerton
,
J. S.
Jiang
, and
S. D.
Bader
,
J. Magn. Magn. Mater.
200
,
392
404
(
1999
).
10.
R. C.
Pullar
,
Prog. Mater. Sci.
57
,
1191
1334
(
2012
).
11.
Mi.
Hee Won
and
C.
Sung Kim
,
J. Appl. Phys.
115
,
17A509
(
2014
).
12.
L.
Affleck
,
M. D.
Aguas
,
Q. A.
Pankhurst
,
I. P.
Parkin
, and
W.
Andrew
,
Steer Adv. Mater.
12
,
1359
1362
(
2000
).
13.
J.
Jia
,
C.
Liu
,
N.
Ma
,
G.
Han
,
W.
Weng
, and
P.
Du
,
Sci. Technol. Adv. Mater.
14
,
045002
(
2013
).
14.
S.
Mori
,
J. Phys. Soc. Jpn.
28
,
44
(
1970
).
15.
S.
Mori
,
J. Am. Chem. Soc.
49
,
11
,
600
605
(
1966
).
16.
E.
Taketani
,
E.
Matsui
,
N.
Fujimura
, and
K.
Morii
,
IEEE Trans. Magn.
40
,
2736
(
2004
).
17.
T.
Matsui
,
H.
Tanaka
,
N.
Fujimura
,
T.
Ito
,
H.
Mabuchi
, and
K.
Morii
,
Appl. Phys. Lett.
81
,
2764
(
2002
).
18.
C.
Callender
,
D. P.
Norton
,
R.
Das
,
A. F.
Hebard
, and
J. D.
Budai
,
Appl. Phys. Lett.
92
,
012514
(
2008
).
19.
T.
Matsui
,
E.
Taketani
,
R.
Sato
, and
K.
Morii
,
J. Phys. D: Appl. Phys.
40
,
6066
6070
(
2007
).
20.
T.
Matsui
,
E.
Taketani
,
H.
Tsuda
,
N.
Fujimura
, and
K.
Morri
,
Appl. Phys. Lett.
86
,
82902
(
2005
).
21.
M.
Bibes
and
A.
Barthélémy
,
Nat. Mater.
7
,
425
426
(
2008
).
22.
J. F.
Scott
,
Nat. Mater.
6
,
256
257
(
2007
).
23.
J. Y.
Son
,
J.-H.
Lee
,
S.
Song
,
Y.-H.
Shin
, and
H. M.
Jang
,
ACS Nano
7
(
6
),
5522
5529
(
2013
).
24.
N. A.
Hill
,
J. Phys. Chem. B
104
,
6694
6709
(
2000
).
25.
N. A.
Spaldin
and
M.
Fiebig
,
Science
309
,
391
392
(
2005
).
26.
T.
Matsui
,
E.
Taketani
,
N.
Fujimura
,
T.
Ito
, and
K.
Morii
,
J. Appl. Phys.
93
,
6993
(
2003
).
27.
F.
Aziz
,
P.
Pandey
,
M.
Chandra
,
A.
Khare
,
D. S.
Rana
, and
K. R.
Mavani
,
J. Magn. Magn. Mater.
356
,
98
102
(
2014
).
28.
P. K.
Pandey
,
R. J.
Choudhary
, and
D. M.
Phase
,
Appl. Phys. Lett.
103
,
132413
(
2013
).
29.
R.
Rana
,
P.
Pandey
,
R. P.
Singh
, and
D. S.
Rana
,
Sci. Rep.
4
,
4138
(
2014
).
30.
T.
He
and
R. J.
Cava
,
Phys. Rev. B
63
,
172403
(
2001
).
31.
L.
Du
,
Y.
Du
,
Y.
Li
,
J.
Wang
,
C.
Wang
,
X.
Wang
,
P.
Xu
, and
X.
Han
,
J. Phys. Chem. C
114
,
19600
19606
(
2010
).
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