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), article number 155416. doi: 10.1103/physrevb.80.155416
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.
| Publication Type: | Article |
|---|---|
| Additional Information: | 10 pages, 12 figures |
| Subjects: | Q Science > QC Physics |
| Departments: | School of Science & Technology > Mathematics |
| Related URLs: | |
| SWORD Depositor: |
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