Spin-dependent Quantum Interference in Single-Wall Carbon Nanotubes with Ferromagnetic Contacts

Abstract

We report the experimental observation of spin-induced magnetoresistance in single-wall carbon nanotubes contacted with high-transparency ferromagnetic electrodes. In the linear regime the spin-induced magnetoresistance oscillates with gate voltage in quantitative agreement with calculations based on a Landauer-Buttiker model for independent electrons. Consistent with this interpretation, we find evidence for bias-induced oscillation in the spin-induced magnetoresistance signal on the scale of the level spacing in the nanotube. At higher bias, the spin-induced magnetoresistance disappears because of a sharp decrease in the effective spin-polarization injected from the ferromagnetic electrodes.

Replaced with published version

References in corpus (4)

• Electric Field Control of Spin Transport
• Electrical Spin Injection in Multi-Wall carbon NanoTubes with transparent ferromagnetic contacts
• Gated Spin Transport through an Individual Single Wall Carbon Nanotube
• Controlling spin in an electronic interferometer with spin-active interfaces

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• Exchange effects in spin polarized transport through carbon nanotube quantum dots
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