A series of n-type Zn1xCuxO (x=0.02, 0.06, 0.10, and 0.12) films was prepared using direct current reactive magnetron sputtering. Magnetic measurements indicate that all the films are ferromagnetic at room temperature and the moment per Cu ion decreases with increasing copper concentration and nitrogen doping. The observed magnetic moment was 1.8μBCu for Zn0.98Cu0.02O film and the transition temperature of about 350K decreased to 320K due to nitrogen doping. It can be concluded that itinerant electrons play an important role in ferromagnetism. The resistivity increased with increasing copper concentration and nitrogen doping. The anomalous Hall effect has been found for ferromagnetic materials.

1.
S. A.
Wolf
,
D. D.
Awschalom
,
R. A.
Buhrman
,
J. M.
Daughton
,
S.
von Molnár
,
M. L.
Roukes
,
A. Y.
Chtchlkanova
, and
D. M.
Treger
,
Science
294
,
1488
(
2001
).
2.
T.
Dietl
,
H.
Ohno
,
F.
Matsukura
,
J.
Cibert
, and
D.
Ferrand
,
Science
287
,
1019
(
2000
).
3.
S. J.
Pearton
,
D. P.
Norton
,
K.
Ip
,
Y. W.
Heo
, and
T.
Steiner
,
J. Vac. Sci. Technol. B
22
,
932
(
2004
).
4.
H. Y.
Xu
,
Y. C.
Liu
,
C. S.
Xu
,
Y. X.
Liu
,
C. L.
Shao
, and
R.
Mu
,
Appl. Phys. Lett.
88
,
242502
(
2006
).
5.
H. S.
Hsu
,
J. C. A.
Huang
,
Y. H.
Huang
,
Y. F.
Liao
,
M. Z.
Lin
,
C. H.
Lee
,
J. F.
Le
,
S. F.
Chen
,
L. Y.
Lai
, and
C. P.
Liu
,
Appl. Phys. Lett.
88
,
242507
(
2006
).
6.
X. C.
Liu
,
E. W.
Shi
,
Z. Z.
Chen
,
H. W.
Zhang
,
B.
Xiao
, and
L. X.
Song
,
Appl. Phys. Lett.
88
,
252503
(
2006
).
7.
M. H.
Kane
,
K.
Shalini
,
C. J.
Summers
,
R.
Varatharajan
,
J.
Nause
,
C. R.
Vestal
,
Z. J.
Zhang
, and
I. T.
Ferguson
,
J. Appl. Phys.
97
,
023906
(
2005
).
8.
Xiaoxue
Liu
,
Fangting
Lin
,
Linlin
Sun
,
Wenjuan
Cheng
,
Xueming
Ma
, and
Wangzhou
Shi
,
Appl. Phys. Lett.
88
,
062508
(
2006
).
9.
L. Q.
Liu
,
B.
Xiang
,
X. Z.
Zhang
,
Y.
Zhang
, and
D. P.
Yu
,
Appl. Phys. Lett.
88
,
063104
(
2006
).
10.
Jeong Hyun
Shim
,
Taesoon
Hwang
,
Soonchil
Lee
,
Jung Hye
Park
,
Seung-Jin
Han
, and
Y. H.
Jeong
,
Appl. Phys. Lett.
86
,
082503
(
2005
).
11.
C.
Song
,
K. W.
Geng
,
F.
Zeng
,
X. B.
Wang
,
Y. X.
Shen
,
F.
Pan
,
Y. N.
Xie
,
T.
Liu
,
H. T.
Zhou
, and
Z.
Fan
,
Phys. Rev. B
73
,
024405
(
2006
).
12.
H. Y.
Xu
,
Y. C.
Liu
,
C. S.
Xu
,
Y. X.
Liu
,
C. L.
Shao
, and
R.
Mu
,
J. Chem. Phys.
124
,
074707
(
2006
).
13.
Z.
Jin
,
T.
Fukumura
,
M.
Kawasaki
,
K.
Ando
,
H.
Saito
,
Y. Z.
Yoo
,
M.
Murakami
,
Y.
Matsumoto
,
T.
Hasegawa
, and
H.
Koinuma
,
Appl. Phys. Lett.
78
,
3824
(
2001
).
14.
D. B.
Buchholz
,
R. P. H.
Chang
,
J. H.
Song
, and
J. B.
Ketterson
,
Appl. Phys. Lett.
87
,
082504
(
2005
).
15.
Lin-Hui
Ye
,
A. J.
Freeman
, and
B.
Delley
,
Phys. Rev. B
73
,
033203
(
2006
).
16.
K.
Sato
and
H.
Katayama-Yoshida
,
Jpn. J. Appl. Phys., Part 2
39
,
L555
(
2000
).
17.
Min Sik
Park
and
B. I.
Min
,
Phys. Rev. B
68
,
224436
(
2003
).
18.
C.-H.
Chien
,
S. H.
Chiou
,
G. Y.
Gao
, and
Y.-D.
Yao
,
J. Magn. Magn. Mater.
282
,
275
(
2004
).
19.
Hyeon-Jun
Lee
,
Bo-Seong
Kim
,
Chae Ryong
Cho
, and
Se-Young
Jeong
,
Phys. Status Solidi B
241
,
1533
(
2004
).
You do not currently have access to this content.