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Giant magnetoresistance of nickel-contacted carbon nanotubes

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Stavros Athanasopoulos1,2, Steven W Bailey1, Jaime Ferrer3, Victor M García Suárez1, Colin J Lambert1, Alexandre R Rocha4 and Stefano Sanvito4

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We present ab initio theoretical results for the giant magnetoresistance of single-wall carbon nanotubes (CNT) in contact with nickel electrodes. These show that Ni atoms located on the surface or axis of CNT contacts can induce a significant magnetic moment on the carbon atoms. For non-gated, undoped CNTs, this produces room-temperature GMR ratios of between 45% and 100% of the anti-aligned conductance.


PACS

73.63.Fg Nanotubes

71.15.-m Methods of electronic structure calculations

73.22.-f Electronic structure of nanoscale materials: clusters, nanoparticles, nanotubes, and nanocrystals

75.47.De Giant magnetoresistance

Subjects

Condensed matter: electrical, magnetic and optical

Nanoscale science and low-D systems

Dates

Issue 4 (31 January 2007)

Received 19 September 2006, in final form 13 November 2006

Published 12 January 2007



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