|
Recently, it was experimentally reported that the carbon atom of the graphene has induced magnetic moment on Ni(111)[1]. Understanding the magnetic interaction between the graphene and magnetic electrodes or substrates is important for spintronics-device applications of graphene. It is expected that the magnetic coupling between graphene and magnetic electrode or substrate significantly affect the electronic structure and transport properties of graphene. In this study, we have performed first-principles non-collinear density functional calculations of graphene and graphene nanoribbon on substrates. We clarify how magnetic electrodes or substrate affect the electronic structure and magnetism of graphene. We find that the magnetic moment of the edge C atom in the mono-layer ZGNR on Ni(111) layer is very small. In the case of the ZGNR over a graphene sheet on Ni(111), the magnetic moment of the edge C atom at the ZGNR maintains and the ferromagnetic state is stable. We will discuss the effect of spin-orbit interaction and noncollinear magnetism on transport properties of graphene and graphene nanoribbon. [1] M. Weser et al., Appl. Phys. Lett. 96 012504, (2010). |
|