Figure 2: Spin transport in a reference graphene lateral spin valve.
Measurements are done using the red-coloured circuit diagram in Fig. 1a. (a) Non-local resistance Rnl as a function of the magnetic field B measured at different Vg at 50 K. The current bias is 10 μA and the centre-to-centre distance between ferromagnetic electrodes (L) is 1 μm. Individual sweeps are offset in Rnl for clarity. (b) Spin signal ΔRnl measured at different Vg (red circles). The black solid line shows the sheet conductivity of the graphene as a function of Vg. The inset shows schematically the spin current (green arrow) reaching the detector in the full range of Vg. Error bars are calculated using the s.e. associated with the statistical average of the non-local resistance in the parallel and antiparallel states.
