Figure 2: Non-local measurements on CVD graphene.
From: Giant spin Hall effect in graphene grown by chemical vapour deposition
(a) RNL versus n for pristine graphene sample (lower panel) and Cu-CVD graphene (upper panel). L/w=2 for both the samples. The grey dotted lines represent the Ohmic contribution to the non-local signals. (b) RNL/ρ versus L for CVD graphene with the width w=500 nm. The data are mean values for three samples and the error bar corresponds to the s.d. from the mean value. Inset: RNL for different L/w ratio of the channel. (c) RNL/ρ versus w for Cu-CVD graphene. Here, L=2 μm for all devices. The grey dotted line shows the Ohmic contribution and (d) the in-plane magnetic field dependence of the non-local signal for Cu-CVD graphene samples. The dotted line is the fit for the data using equation (6). Inset: magnetic field dependence of pristine exfoliated graphene sample.
