| Issue |
Europhys. Lett.
Volume 67, Number 1, July 2004
|
|
|---|---|---|
| Page(s) | 103 - 109 | |
| Section | Condensed matter: electronic structure, electrical, magnetic, and optical properties | |
| DOI | https://doi.org/10.1209/epl/i2003-10273-1 | |
| Published online | 01 June 2004 | |
Spin-dependent magnetoresistance in multiwall carbon nanotubes
1
IPN, Faculté des Sciences de Base, EPFL - 1015 Lausanne, Switzerland
2
LSI, Ecole Polytechnique, CNRS-UMR 7642 and CEA/DSM/DRECAM 91128 Palaiseau Cedex, France
Corresponding author: jean-eric.wegrowe@polytechnique.fr
Received:
5
September
2003
Accepted:
27
April
2004
The spin-dependent transport in multiwall carbon nanotubes,
obtained by chemical vapour deposition in porous alumina
membranes, has been investigated. The zero-bias anomaly is shown
to follow the typical power law 
. In the
nanotubes contacted with 
pads, the magnetoresistance due
to the spin-polarised current (SD-MR) is destroyed. In the case of
those contacted with 
pads, however, the SD-MR is
observed. These measurements show that both the observation of a
typical scaling law of the conductance (for nanotubes up to
1.5
) and a short spin diffusion length (less than
0.15 with nickel contacts and 0.7 with cobalt
contacts) coexist through the nanotube. This observation may be
interpreted in terms of a reminiscence of the Luttinger-liquid
behaviour with
spin-charge separation.
PACS: 73.63.Fg – Electronic transport in nanoscale materials and structures: Nanotubes / 72.15.Nj – Collective modes (e.g., in one-dimensional conductors) / 72.25.Hg – Electrical injection of spin polarized carriers
© EDP Sciences, 2004
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