Spin transport in nanotubes (invited)

Abstract
We study electron spin transport through carbon nanotubes contacted by ferromagneticelectrodes. The resistance of a ferromagnetically contacted multiwalled nanotube switches hysteretically as a function of applied magnetic field, with a maximum resistance change of 9% at 4.2 K. Magnetoresistance measurements of carbon nanotubes having one cobalt contact and one platinum/gold contact, however, show no switching. In addition, we present calculations of the magnetoresistance ratio for the ferromagneticnanotube device, and predict that a resistance change of 25% is possible.

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