Wave-vector-dependent spin filtering and spin transport through magnetic barriers in graphene

Article

关键词: KLEIN PARADOX;    BERRYS PHASE;    SUPERLATTICES;   

DOI  :  10.1103/PhysRevB.80.155416

来源: SCIE

【 摘 要 】

We study the spin-resolved transport through magnetic nanostructures in monolayer and bilayer graphene. We take into account both the orbital effect of the inhomogeneous perpendicular magnetic field as well as the in-plane spin splitting due to the Zeeman interaction and to the exchange coupling possibly induced by the proximity of a ferromagnetic insulator. We find that a single barrier exhibits a wave-vector-dependent spin filtering effect at energies close to the transmission threshold. This effect is significantly enhanced in a resonant double barrier configuration, where the spin polarization of the outgoing current can be increased up to 100% by increasing the distance between the barriers.

【 授权许可】

Free