Abstract
We achieve tunneling spin injection from Co into single layer graphene (SLG) using seeded MgO barriers. A nonlocal magnetoresistance () of is observed at room temperature, which is the largest value observed in any material. Investigating vs SLG conductivity from the transparent to the tunneling contact regimes demonstrates the contrasting behaviors predicted by the drift-diffusion theory of spin transport. Furthermore, tunnel barriers reduce the contact-induced spin relaxation and are therefore important for future investigations of spin relaxation in graphene.
- Received 4 March 2010
DOI:https://doi.org/10.1103/PhysRevLett.105.167202
© 2010 The American Physical Society