Volume 67, Number 1, July 2004
|Page(s)||103 - 109|
|Section||Condensed matter: electronic structure, electrical, magnetic, and optical properties|
|Published online||01 June 2004|
Spin-dependent magnetoresistance in multiwall carbon nanotubes
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: firstname.lastname@example.org
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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