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Spin-dependent quantum interference in single-wall carbon nanotubes with ferromagnetic contacts

2006; American Physical Society; Volume: 73; Issue: 24 Linguagem: Inglês

10.1103/physrevb.73.241401

1550-235X

H. T. Man, I. J. W. Wever, Alberto F. Morpurgo,

Graphene research and applications

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-B\"uttiker 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.