Figure 1: Fabrication of graphene/nanowire structures.
From: Spin transport and Hanle effect in silicon nanowires using graphene tunnel barriers
(a) Schematic of four-terminal nanowire device; contacts 1 and 4 are ohmic contacts applied directly to the nanowire, and contacts 2 (1 μm wide) and 3 (200 nm wide) are NiFe/graphene tunnel barriers for electrical spin injection and detection. The edge-to-edge separation of contacts 2 and 3 is 200 nm. (b) Atomic force microscopy image of graphene covered nano wire, green line is line scan shown in c, (c) line scan of graphene covered nanowire. (d) Scanning electron microscopy (SEM) image of a NiFe/graphene contact on NW. The graphene smoothly bridges the nanowire so that the NiFe film is smooth and continuous. Scale bar, 1 μm. (e) SEM image of an Au contact on an NW showing discontinuous portions of the metallization at the nanowire. Scale bar, 1 μm.
