Abstract
We demonstrated spin injection into a graphene thin film at room temperature. The thickness of the graphene thin film was typically 8−16 nm. In addition to a conventional 2-terminal “local” measurement scheme, a 4-terminal “non-local” measurement was introduced for excluding spurious signals and providing reliable results. In the non-local measurement, an electric current path and a spin current path were completely separated and difference in electrochemical potential of spin current were detected. We detected 200 nV of an output voltage in the non-local measurements, which directly indicated the spin injection and spin current generation in the graphene. This was the first direct demonstration of spin current detection in molecules at room temperature.
