A graphite-diamond hybrid structure as a half-metallic nano wire.

Design of a nanometer-scale half-metallic wire made of a graphene structure on a diamond (100) surface was performed theoretically. The wire consists of a nano-graphene ribbon covalently bonded to the diamond surface. Due to spin polarization of edge states, the graphene structure shows a finite magnetic moment. Stability of the structure and existance of spin moment (1μB per an edge carbon atom) are confirmed by the first-principles calculation with the local-spin-density approximation. The half-metallicity appears when a shift (∼ 120meV) in the Fermi level is given. © 2005 American Institute of Physics [ABSTRACT FROM AUTHOR]