Abstract
We investigated theoretically in detail the size effect of spin-polarized transport in FM/Single-walled carbon nanotube/FM junctions (FM/SWCNT/FM) consisting of the achiral types of tubes: armchair tubes and zigzag tubes. The results show that the spin-polarized transport has different oscillation behaviors with the junctionʼs size in these two junctions. And the effect of tunnel magnetoresistance (TMR) in zigzag tube is stronger than that in armchair tubes. For all zigzag tubes when the size exceeds a limit the size effect on TMR disappears and TMR value reaches one maximum 20%. Furthermore, for each family of zigzag tubes, this limit of size increases with increasing tubeʼs radius. For short zigzag tubes the TMR can be negative at some special sizes. And the negative TMR value can reach −12% at the angle π. Finally, except for the zero angel, the obtained results show that for all zigzag tubes the extremum of TMR is at the angle π. For all armchair tubes, the TMR value has one oscillation of small amplitude with the increase of angle and it has two extrema: the maximum at π/2 and the minimum at π, respectively.
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