https://doi.org/10.1140/epjb/e2005-00334-9
Spin-polarized transport in carbon nanotubes with impurities
1
Department of Physics, Beijing University of
Aeronautics and Astronautics, Beijing 100083, P.R. China
2
State Key Laboratory for Mesoscopic Physics and Department of Physics, Peking University, Beijing 100871, P.R. China
Corresponding author: a hpan@pku.edu.cn
Received:
10
February
2005
Revised:
27
July
2005
Published online:
28
October
2005
Impurity effects on the spin-polarized transport through armchair carbon nanotubes contacted by ferromagnetic leads are investigated theoretically. The length of the nanotube can cause on-resonance and off-resonance behaviors of the spin-coherent transport. The impurity suppresses the conductance for the on-resonance case, while it enhances the conductance for the off-resonance one. With increasing impurity strength, the tunnel magnetoresistance exhibits a maximum or minimum value for the on-resonance or off-resonance case, respectively.
PACS: 72.25.-b – Spin polarized transport / 73.63.-b – Electronic transport in nanoscale materials and structures / 73.63.Fg – Nanotubes
© EDP Sciences, Società Italiana di Fisica, Springer-Verlag, 2005
