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

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

2005-12-20

arxiv.org/abs/cond-mat/0512505v2

Phys. Rev. B 73, 241401(R) (2006)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Replaced with published version

Scientific paper

10.1103/PhysRevB.73.241401

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.

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