Fig. 4.

Distance dependence of the spin signal R_el at 200K. A signal persists for tens of micrometers at both the spin-flop field (Platinum wires along x, blue) and low fields (Platinum wires along y, red). Only the spin signal is shown, fit by a one dimensional spin diffusion equation ¹ (the spin-Seebeck signal persists over more than 80 μm, although is difficult to appraise as the heating and spin-current source are delocalized³³). Error bars are a combination of the standard error on the mean and the measurement noise floor. (Inset) The spin-bias voltages, V_el, are linear as per a non-equilibrium spin-transport mechanism.