Local long-distance spin transport in single layer graphene spin filter

Abstract

Spin transport through single layer graphene grown by chemical vapor deposition has been measured in the local measurement configuration using aluminum oxide tunnel barriers and Co electrodes. Unlike the case of non-local measurements we report positive magnetoresistance for graphene channels as long as 10 microns at room temperature. Our analysis shows that the spin diffusion length in graphene is 14 ±4 microns at room temperature, bringing us a step closer to spintronic applications based on graphene spin filters.