title: Graphene nanoring as a tunable source of polarized electrons.
abstract: We propose a  novel spin filter based on a graphene nanoring fabricated above a ferromagnetic strip. The exchange interaction between the magnetic moments of the ions in the ferromagnet and the electron spin splits the electronic states, and gives rise to spin polarization of the conductance and the total electric current. We demonstrate that  both the current and its polarization can be controlled by a side-gate voltage. This opens the possibility to use the proposed device as a tunable source of polarized electrons.
authors.affiliation: GISC, Departamento de Física de Materiales, Universidad Complutense, E-28040 Madrid, Spain. j.munarriz@fis.ucm.es
authors.forename: J
authors.initials: J
authors.lastname: Munárriz
authors.forename: F
authors.initials: F
authors.lastname: Domínguez-Adame
authors.forename: P A
authors.initials: PA
authors.lastname: Orellana
authors.forename: A V
authors.initials: AV
authors.lastname: Malyshev
mesh_terms: D003198:Computer Simulation; D017076:Computer-Aided Design; D004583:Electrons; D004867:Equipment Design; D019544:Equipment Failure Analysis; D006108:Graphite / Q000737:chemistry*; D060526:Magnetic Fields; D008956:Models, Chemical; D053758:Nanoparticles / Q000737:chemistry*; D036103:Nanotechnology / Q000295:instrumentation*; D012542:Scattering, Radiation; D020349:Surface Plasmon Resonance / Q000295:instrumentation*
chemical_list: D006108:Graphite