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Linear scaling between momentum and spin scattering in graphene

2009; American Physical Society; Volume: 80; Issue: 24 Linguagem: Inglês

10.1103/physrevb.80.241403

1550-235X

C. Józsa, T. Maassen, M. Popinciuc, P. J. Zomer, A. Veligura, Harry T. Jonkman, B. J. van Wees,

Advancements in Semiconductor Devices and Circuit Design

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 $1--2\text{ }\ensuremath{\mu}\text{m}$. We present Hanle spin precession measurements in gated lateral spin valve devices in the low to high (up to ${10}^{13}\text{ }{\text{cm}}^{\ensuremath{-}2}$) 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 $2\ifmmode\times\else\texttimes\fi{}{10}^{5}\text{ }{\text{cm}}^{2}/\text{Vs}$, our results predict that a considerable increase in the spin-diffusion length should be possible.