Interfacial charge current in a magnetised/normal graphene junction
Department of Physics, Southeast University, Nanjing 211189, P.R. China
Received: 19 December 2011
Received in final form: 30 April 2012
Published online: 30 July 2012
We theoretically investigate a possible interfacial charge current flowing in a magnetised/normal graphene junction where both the intrinsic and extrinsic (Rashba) spin-orbit coupling (SOC) is considered in the normal graphene. It is found that a spin galvanic effect occurs at the interface and the charge current is converted from the spin Hall current flowing at the interface because of the spin exchange field. The evanescent modes dominate the spin galvanic effect for the intrinsic SOC whereas the transmitted modes mainly contribute to the interfacial charge current for the Rashba term. The optimal magnetisation favouring the charge current is perpendicular to the graphene plane for the intrinsic SOC, while the favoured magnetisation for the Rashba SOC is perpendicular to the interface of the junction.
Key words: Mesoscopic and Nanoscale Systems
© EDP Sciences, Società Italiana di Fisica and Springer-Verlag, 2012