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

Dell'Anna, L. & De Martino, A. (2009). Wavevector-dependent spin filtering and spin transport through magnetic barriers in graphene. Phys. Rev. B 80, 155416 (2009), 80(15), doi: 10.1103/PhysRevB.80.155416

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Abstract

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.

Item Type: Article
Additional Information: 10 pages, 12 figures
Subjects: Q Science > QC Physics
Divisions: School of Engineering & Mathematical Sciences > Department of Mathematical Science
Related URLs:
URI: http://openaccess.city.ac.uk/id/eprint/1655

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