Muñoz Rojas, Federico, Fernández-Rossier, Joaquín, Palacios Burgos, Juan José
Giant magnetoresistance in ultrasmall graphene based devices
MUÑOZ-ROJAS, F.; FERNÁNDEZ-ROSSIER, J.; PALACIOS, J.J. “Giant magnetoresistance in ultrasmall graphene based devices”. Physical Review Letters. Vol. 102, No. 13 (3 Apr. 2009). ISSN 0031-9007, pp. 136810-1/4
URI: http://hdl.handle.net/10045/25255
DOI: 10.1103/PhysRevLett.102.136810
ISSN: 0031-9007 (Print)
Abstract: 
By computing spin-polarized electronic transport across a finite zigzag graphene ribbon bridging two metallic graphene electrodes, we demonstrate, as a proof of principle, that devices featuring 100% magnetoresistance can be built entirely out of carbon. In the ground state a short zigzag ribbon is an antiferromagnetic insulator which, when connecting two metallic electrodes, acts as a tunnel barrier that suppresses the conductance. The application of a magnetic field makes the ribbon ferromagnetic and conductive, increasing dramatically the current between electrodes. We predict large magnetoresistance in this system at liquid nitrogen temperature and 10 T or at liquid helium temperature and 300 G.
Keywords:Spin-polarized electronic transport, Graphene, Magnetoresistance, Zigzag edges, Conductance
American Physical Society
info:eu-repo/semantics/article