Spin-dependent magnetoresistance in multiwall carbon nanotubes

X. Hoffer; Ch. Klinke; J.-M. Bonard; L. Gravier; J.-E. Wegrowe

doi:10.1209/epl/i2003-10273-1

All issues

Volume 67 / No 1 (July 2004)

Europhys. Lett., 67 1 (2004) 103-109

Abstract

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

Europhys. Lett., 67 (1), pp. 103-109 (2004)

Spin-dependent magnetoresistance in multiwall carbon nanotubes

X. Hoffer¹, Ch. Klinke¹, J.-M. Bonard¹, L. Gravier¹ and J.-E. Wegrowe²

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

Abstract

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 $GT^{-{\alpha}}(eV/kT)$ . In the nanotubes contacted with $\chem{Ni}$ pads, the magnetoresistance due to the spin-polarised current (SD-MR) is destroyed. In the case of those contacted with $\chem{Co}$ 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 $\un{\mu m}$ ) and a short spin diffusion length (less than 0.15 $\un{\mu m}$ with nickel contacts and 0.7 $\un{\mu m}$ 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

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