Spin Lifetimes Exceeding 12 ns in Graphene Nonlocal Spin Valve Devices.

@article{Drgeler2016SpinLE,
  title={Spin Lifetimes Exceeding 12 ns in Graphene Nonlocal Spin Valve Devices.},
  author={Marc Dr{\"o}geler and Christopher Franzen and Frank Volmer and Tobias Pohlmann and L Banszerus and Maik Wolter and Kenji Watanabe and Takashi Taniguchi and Christoph Stampfer and Bernd Beschoten},
  journal={Nano letters},
  year={2016},
  volume={16 6},
  pages={
          3533-9
        }
}
We show spin lifetimes of 12.6 ns and spin diffusion lengths as long as 30.5 μm in single layer graphene nonlocal spin transport devices at room temperature. This is accomplished by the fabrication of Co/MgO-electrodes on a Si/SiO2 substrate and the subsequent dry transfer of a graphene-hBN-stack on top of this electrode structure where a large hBN flake is needed in order to diminish the ingress of solvents along the hBN-to-substrate interface. Interestingly, long spin lifetimes are observed… CONTINUE READING