Thin films of (001)-oriented Sr2FeMoO6 have been epitaxially deposited on LaAlO3 and SrTiO3 (001) substrates. Comparison of their transport and magnetic properties with those of polycrystalline ceramic samples shows a metallic versus semiconductor temperature dependence and a saturation magnetization Ms at 10 K of 3.2 μB/f.u. in the film as against 3.0 for a tetragonal polycrystalline sample. However, the Curie temperature TC≈389 K is reduced from 415 K found for the tetragonal ceramic, which lowers Ms at 300 K in the thin films to 2.0 μB/f.u. compared to 2.2 μB/f.u. in the ceramics. A Wheatstone bridge arrangement straddling a bicrystal boundary has been used to verify that spin-dependent electron transfer through a grain boundary is responsible for the low-field magnetoresistance found in polycrystalline samples below TC.

1.
H. Y.
Hwang
,
S.-W.
Cheong
,
N. P.
Ong
, and
B.
Batlogg
,
Phys. Rev. Lett.
77
,
2041
(
1996
).
Google Scholar
 
2.
X. W.
Li
,
A.
Gupta
,
G.
Xiao
, and
G. Q.
Gong
,
Appl. Phys. Lett.
71
,
1124
(
1997
).
Google Scholar
 
3.
R.
Shreekala
,
M.
Rajeswari
,
K.
Ghosh
,
A.
Goyal
,
J. Y.
Gu
,
C.
Kwon
,
Z.
Trajanovic
,
T.
Boettcher
,
R. L.
Greene
,
R.
Ramesh
, and
T.
Venkatesan
,
Appl. Phys. Lett.
71
,
282
(
1997
).
Google Scholar
 
4.
N. D.
Mathur
,
G.
Burnell
,
S. P.
Isaac
,
T. J.
Jackson
,
B.-S.
Teo
,
J. L.
MacManus-Driscoll
,
L. F.
Cohen
,
J. E.
Evetts
, and
M. G.
Blamire
,
Nature (London)
387
,
266
(
1997
).
Google Scholar
 
5.
M.
Ziese
,
G.
Heydon
,
R.
Hohne
,
P.
Esquinazi
, and
J.
Dienelt
,
Appl. Phys. Lett.
74
,
1481
(
1999
).
Google Scholar
 
6.
Ll.
Balcells
,
J.
Fontcuberta
,
B.
Martinez
, and
X.
Obradors
,
Phys. Rev. B
58
,
R14697
(
1998
).
Google Scholar
 
7.
S.
Lee
,
H. Y.
Hwang
,
B. I.
Shraiman
,
W. D.
Ratcliff
II, and
S. W.
Cheong
,
Phys. Rev. Lett.
82
,
4508
(
1999
).
Google Scholar
 
8.
Y.
Lu
,
X. W.
Li
,
G. Q.
Gong
,
G.
Xiao
,
A.
Gupta
,
P.
Lecoeur
,
J. Z.
Sun
,
Y. Y.
Wang
, and
V. P.
Dravid
,
Phys. Rev. B
54
,
R8357
(
1996
).
Google Scholar
 
9.
T.
Obata
,
T.
Manako
,
Y.
Shimakawa
, and
Y.
Kuba
,
Appl. Phys. Lett.
74
,
290
(
1999
).
Google Scholar
 
10.
K.-I.
Kobayashi
,
T.
Kimura
,
H.
Sawada
,
K.
Terakura
, and
Y.
Tokura
,
Nature (London)
395
,
677
(
1998
).
Google Scholar
 
11.
R. Dass and J. B. Goodenough (unpublished).
12.
T.
Manako
,
M.
Izumi
,
Y.
Konishi
,
K.-I.
Kobayashi
,
M.
Kawasaki
, and
Y.
Tokura
,
Appl. Phys. Lett.
74
,
2215
(
1999
).
Google Scholar
 
13.
H.
Asano
,
S. B.
Ogale
,
J.
Garrison
,
A.
Orizco
,
Y. H.
Li
,
V.
Smolyaninova
,
C.
Galley
,
M.
Downes
,
M.
Rajeswari
,
R.
Ramesh
, and
T.
Venkatesan
,
Appl. Phys. Lett.
74
,
3696
(
1999
).
Google Scholar
 
This content is only available via PDF.
© 1999 American Institute of Physics.
1999
American Institute of Physics
You do not currently have access to this content.