Enhanced spin injection and spin lifetime in Graphene
Abstract
Graphene is an attractive material for spintronics due to the low intrinsic spin-orbit and hyperfine coupling, which should lead to excellent spin transport properties. Earlier studies on spin injection and transport in graphene present two major challenges: low spin injection efficiency and short spin lifetimes compared to the theoretical predictions. In our work, we utilized TiO2 Seeded MgO barriers and achieved tunneling spin injection into single layer. As a result, large nonlocal magnetoresistances were observed at room temperature, with high spin injection efficiency up to 30%. Surprisingly, enhanced spin lifetimes of graphene are obtained, which is due to reducing the contract-induced spin relaxation by inserting tunnel barrier between graphene and Co electrodes.
Thanks to the support of ONR and NSF.- Publication:
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APS March Meeting Abstracts
- Pub Date:
- March 2011
- Bibcode:
- 2011APS..MARX16001H