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arXiv · 0910.1054

Linear scaling between momentum and spin scattering in graphene

C. Jozsa·T. Maassen·M. Popinciuc·P. J. Zomer·A. Veligura·H. T. Jonkman·B. J. van Wees
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Abstract

Spin transport in graphene carries the potential of a long spin diffusion length at room temperature. However, extrinsic relaxation processes limit the current experimental values to 1-2 um. We present Hanle spin precession measurements in gated lateral spin valve devices in the low to high (up to 10^13 cm^-2) carrier density range of graphene. A linear scaling between the spin diffusion length and the diffusion coefficient is observed. We measure nearly identical spin- and charge diffusion coefficients indicating that electron-electron interactions are relatively weak and transport is limited by impurity potential scattering. When extrapolated to the maximum carrier mobilities of 2x10^5 cm^2/Vs, our results predict that a considerable increase in the spin diffusion length should be possible.

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C. Jozsa, T. Maassen, M. Popinciuc, P. J. Zomer, A. Veligura, H. T. Jonkman, B. J. van Wees. 2009-11-28. Linear scaling between momentum and spin scattering in graphene. https://doi.org/10.1103/physrevb.80.241403

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