Permalloy-based carbon nanotube spin-valve

Details Permalloy-based carbon nanotube spin-valve Permalloy-based carbon nanotube spin-valve

2010-09-10

arxiv.org/abs/1009.1960v1

Appl. Phys. Lett. 97, 153116 (2010)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

3 pages

Scientific paper

10.1063/1.3502600

In this Letter we demonstrate that Permalloy (Py), a widely used Ni/Fe alloy, forms contacts to carbon nanotubes (CNTs) that meet the requirements for the injection and detection of spin-polarized currents in carbon-based spintronic devices. We establish the material quality and magnetization properties of Py strips in the shape of suitable electrical contacts and find a sharp magnetization switching tunable by geometry in the anisotropic magnetoresistance (AMR) of a single strip at cryogenic temperatures. In addition, we show that Py contacts couple strongly to CNTs, comparable to Pd contacts, thereby forming CNT quantum dots at low temperatures. These results form the basis for a Py-based CNT spin-valve exhibiting very sharp resistance switchings in the tunneling magnetoresistance, which directly correspond to the magnetization reversals in the individual contacts observed in AMR experiments.

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