Spin polarized transport over long carbon nanotubes (CNTs) is observed in magnetically assembled spin valves with electrochemically deposited ferromagnetic (FM) electrodes. An annealing procedure is developed to produce stable devices with highly transmissive FM/CNT contacts. The devices exhibit magnetoresistance (MR) with magnitudes up to 4%, and the sign of MR is consistently negative. The temperature dependence is investigated and MR is observed up to . Bias dependence is also investigated, with MR persisting up to .
REFERENCES
1.
S. A.
Wolf
, D. D.
Awschalom
, R. A.
Buhrman
, J. M.
Daughton
, S.
von Molnár
, M. L.
Roukes
, A. Y.
Chtchelkanova
, and D. M.
Treger
, Science
294
, 1488
(2001
).2.
H.
Mehrez
, J.
Taylor
, H.
Guo
, J.
Wang
, and C.
Roland
, Phys. Rev. Lett.
84
, 2682
(2000
).3.
P.
Poncharal
, C.
Berger
, Y.
Yi
, Z. L.
Wang
, and Walt A.
de Heer
, J. Phys. Chem. B
106
, 12104
(2002
).4.
M.
Bockrath
, D. H.
Cobden
, J.
Lu
, A. G.
Rinzler
, R. E.
Smalley
, L.
Balents
, and P. L.
McEuen
, Nature (London)
397
, 598
(1999
).5.
K.
Tsukagoshi
, B. W.
Alphenaar
, and H.
Ago
, Nature (London)
401
, 572
(1999
).6.
S.
Sahoo
, T.
Kontos
, J.
Furer
, C.
Hoffmann
, M.
Gräber
, A.
Cottet
, and C.
Schönenberger
, Nat. Phys.
1
, 99
(2005
).7.
S.
Niyogi
, C.
Hangarter
, R.
Thamankar
, Y.-F.
Chiang
, R.
Kawakami
, N. V.
Myung
, and R. C.
Haddon
, J. Phys. Chem. B
108
, 19818
(2004
).8.
M.
Julliere
, Phys. Lett.
54A
, 225
(1975
).9.
C.
Schonenberger
, A.
Bachtold
, C.
Strunk
, J.-P.
Salvetat
, and L.
Forró
, Appl. Phys. A: Mater. Sci. Process.
69
, 283
(1999
).10.
Y.
Zhang
, N. W.
Franklin
, R. J.
Chen
, R. J.
Chen
, and H.
Dai
, Chem. Phys. Lett.
331
, 35
(2000
).11.
M.
Menon
, A. N.
Andriotis
, and G. E.
Froudakis
, Chem. Phys. Lett.
320
, 425
(2000
).12.
R.
Meservey
and P. M.
Tedrow
, Phys. Rep.
238
, 173
(1994
).13.
B.
Zhao
, I.
Monch
, T.
Mühl
, H.
Vinzelberg
, and C. M.
Schneider
, J. Appl. Phys.
91
, 7026
(2002
).14.
K. D.
Belaschenko
, E. Y.
Tsymbal
, M. V.
Schilfgaarde
, D. A.
Stewart
, I. I.
Oleynik
, and S. S.
Jaswal
, Phys. Rev. B
69
, 174408
(2004
).15.
A. N.
Pasupathy
, R. C.
Bialczak
, J.
Martinek
, J. E.
Grose
, L. A. K.
Donev
, P. L.
McEuen
, and D. C.
Ralph
, Science
306
, 86
(2004
).16.
T. S.
Kim
, Phys. Rev. B
72
, 024401
(2005
).17.
18.
B. J.
LeRoy
, S. G.
Lemay
, J.
Kong
, and C.
Dekker
, Nature (London)
432
, 371
(2004
).19.
Y.
Ishiwata
, H.
Maki
, D.
Tsuya
, M.
Suzuki
, and K.
Ishibashi
, Phys. Status Solidi C
2
, 3137
(2005
).20.
S. O.
Valenzuela
, D. J.
Monsma
, C. M.
Marcus
, V.
Narayanmurthi
, and M.
Tinkham
, Phys. Rev. Lett.
94
, 196601
(2005
).21.
C. M.
Schneider
, B.
Zhao
, R.
Kozhuharova
, S.
Groudeva-Zotova
, T.
Mühl
, M.
Ritschel
, I.
Mönch
, H.
Vinzelberg
, D.
Elefant
, A.
Graff
, A.
Leonhardt
, and J.
Fink
, Diamond Relat. Mater.
13
, 215
(2004
).22.
J.
Nogues
and I. K.
Schuller
, J. Magn. Magn. Mater.
192
, 203
(1999
).23.
A.
Jensen
, J. R.
Hauptmann
, J.
Nygard
, and P. E.
Lindelhof
, Phys. Rev. B
72
, 035419
(2005
).© 2006 American Institute of Physics.
2006
American Institute of Physics
You do not currently have access to this content.