The design of spin filter junction in zigzag graphene nanoribbons with asymmetric edge hydrogenation

Using the non-equilibrium Green's function method combined with the density functional theory, we investigate the electronic transport properties of a heterostructure based on zigzag graphene, This heterostructure consists of H2-NZGNR-H and H-NZGNR-H. Results show that a perfect dual spin filtering effect can be realized with the parallel (P) and antiparallel (AP) magnetiesm configuration, and some magnetic domain walls (DW) at the interface between two component ribbons. The magnetic moments, DOS and PDOS, the transmission pathways and LDOS demonstrate that the edge of C-H2 bonds have important effects for magnetic and spin dependent transport properties compared to the edge of C-H bonds. Our results show that the H2-ZGNR-H/H-NZGNR-H heterostructure holds promise for magneto electronics devices which can keep steady properties when change the widths of the two component ribbons. (C) 2013 Elsevier B.V. All rights reserved.