Wavevector-dependent spin filtering and spin transport through magnetic barriers in graphene

Details Wavevector-dependent spin filtering and spin transport through magnetic barriers in graphene Wavevector-dependent spin filtering and spin transport through magnetic barriers in graphene

2009-06-20

arxiv.org/abs/0906.3809v1

Phys. Rev. B 80, 155416 (2009)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

10 pages, 12 figures

Scientific paper

10.1103/PhysRevB.80.155416

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 wavevector-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.

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