Spin-polarized conductance in graphene-based FSF junctions

Abstract

In this paper, conductance of spin and electron in graphene-based ferromagnet - superconductor (FS) and parallel and antiparallel ferromagnet-superconductor-ferromagnet (FSF) junctions are studied. Using the Dirac-Bogoliubov-de Gennes equations, Andreev and normal reflections are obtained and then using these coefficients, conductance of spin and electrons are calculated at the FS interface(s) analytically. As a result, both the energy dependence of spin and charge differential conductances are investigated and a comparison between electron and spin transport is done in this paper. Effect of exchange energy of ferromagnet h on conductances is studied too. © 2010 Elsevier B.V. All rights reserved.