▎ 摘　　要

The transport of spin electron through a right-angle graphene nanojunction is investigated by means of Landauer-Butikker formalism and the nonequilibrium Green's function technique. We find that when the magnetization M = 0 and the system is metallic, the width of the two leads satisfies N-A = 2N(Z)-1, the electrons completely tunneling at the Dirac point. When the magnetization M not equal 0, the system is metallic and in the parallel configuration, the sub-band selective rule leads to the conductance oscillations with the magnetization. When the system is semiconducting, the band gap leads to the disappearing of the insulating band and produces new oscillation. For the antiparallel configuration, only when the system is semiconducting, the conductance changes significantly compared to the parallel configuration. (C) 2012 Elsevier B.V. All rights reserved.