Fig. 3.

Bias enhanced non-local differential spin signal and large differential spin-injection polarization at room temperature. a Non-local spin signal $\Delta R_{\mathrm{nl}}^{\mathrm{8}-\mathrm{9}}$(I _in) corresponding to the spin current injected through contact 8 and detected via contact 9, as a function of the DC current bias (I _in) applied across the injector. The solid line represents the spin signal $\Delta R_{\mathrm{nl}}^{\mathrm{8}-\mathrm{9}}$(I _in) for a continuous sweeping of the I _in bias, while the dots are extracted from the Hanle signals $\Delta R_{\mathrm{nl}}^{\mathrm{8}-\mathrm{9}}$(B _z) at B _z = 0, measured at different bias (from Fig. 2b). b Differential spin-injection polarization of the injector contact 8, $p_{\mathrm{in}}^{\mathrm{8}}$ as a function of I _in, calculated from the $\Delta R_{\mathrm{nl}}^{\mathrm{8}-\mathrm{9}}$(I _in) (Eq. (3)) data plotted in a