The magnetoresistance of epitaxial Nd0.7Sr0.3MnOδ thin films has been studied. A giant magnetoresistance, with more than 4 orders of magnitude change in resistance (−ΔR/RH≳106%), was obtained at ∼60 K and a magnetic field of 8 T. This giant magnetoresistance (GMR) ratio is about one order of magnitude larger than the highest value reported previously which was observed in La–Ca–Mn–O film. We have also obtained a large GMR ratio with −ΔR/RH≳3000% for H=5 T in an in situ Nd0.7Sr0.3MnOδ thin film, a much larger effect than the previous results in doped manganese oxide films in which a large GMR ratio was obtained only in postannealed samples. Our results also show that the GMR effect in these films can be strongly influenced by the thin‐film preparation conditions.

Topics
Magnetic ordering, Epitaxy, Thin films, Transition metal oxides
1.
R. M.
Kusters,
J.
Singleton,
D. A.
Keen,
R.
Mcgreevy
, and
W.
Hayes,
Physica B
155
,
362
(
1989
).
Google Scholar
 
2.
R.
von Helmolt,
J.
Wecker,
B.
Holzapfel,
L.
Schultz
, and
K.
Samwer,
Phys. Rev. Lett.
71
,
2331
(
1993
).
Google Scholar
 
3.
K. I.
Chahara,
T.
Ohno,
M.
Kasai
, and
Y.
Kozono,
Appl. Phys. Lett.
63
,
1990
(
1993
).
Google Scholar
 
4.
S.
Jin,
T. H.
Tiefel,
M.
McCormack,
R. A.
Fastnacht,
R.
Ramesh
, and
L. H.
Chen,
Science
264
,
413
(
1994
).
Google Scholar
 
5.
M.
McCormack,
S.
Jin,
T. H.
Tiefel,
R. M.
Fleming,
J. M.
Phillips
, and
R.
Ramesh,
Appl. Phys. Lett.
64
,
3047
(
1994
).
Google Scholar
 
6.
H. L.
Ju,
C.
Kwon,
Q.
Li,
R. L.
Greene
, and
T.
Venkatesan,
Appl. Phys. Lett.
65
,
2109
(
1994
).
Google Scholar
 
7.
M. N.
Baibich,
J. M.
Broto,
A.
Fert,
F.
Nguyen Van Dau,
F.
Petroff,
P.
Eitenne,
G.
Creuzet,
A.
Friederich
, and
J.
Chazelas,
Phys. Rev. Lett.
61
,
2472
(
1988
).
Google Scholar
 
8.
S. S. P.
Parkin,
N.
More
, and
K. P.
Roche,
Phys. Rev. Lett.
64
,
2304
(
1990
).
Google Scholar
 
9.
S. S. P.
Parkin,
Z. G.
Li
, and
D. J.
Smith,
Appl. Phys. Lett.
58
,
2710
(
1991
).
Google Scholar
 
10.
E. E.
Fullerton,
M. J.
Conover,
J. E.
Mattson,
C. H.
Sowers
, and
S. O.
Bader,
Appl. Phys. Lett.
63
,
1699
(
1993
).
Google Scholar
 
11.
S. N.
Okuno
and
K.
Inomata,
Phys. Rev. Lett.
72
,
1553
(
1994
).
Google Scholar
 
12.
A. E.
Berkowitz,
J. R.
Mitchell,
M. J.
Carey
A. P.
Young,
S.
Zhang,
F. E.
Spada,
F. T.
Parker,
A.
Hutten
, and
G.
Thomas,
Phys. Rev. Lett.
68
,
3745
(
1992
).
Google Scholar
 
13.
S. N.
Mao,
X. X.
Xi,
Q.
Li,
T.
Venkatesan,
D. P.
Beesabathina,
L.
Salamanca-Riba
, and
X. D.
Wu,
J. Appl. Phys.
75
,
2119
(
1994
).
Google Scholar
 
14.
G. C. Xiong, Q. Li, H. L. Ju, R. L. Greene, and T. Venkatesan, Appl. Phys. Lett. (to be published).
15.
Y.
Shapira,
S.
Foner,
N. F.
Oliveira
, and
T. B.
Reed,
Phys. Rev. B
10
,
4765
(
1974
).
Google Scholar
 
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