Fig. 6

(Color online) a The calculated spin-dependent I–V curves as a function of the applied bias for M1, M2 and M3. The insert (a′) shows the calculated total currents for each device. b The spin-dependent transmission spectra for M3 at bias − 0.04 V. The shaded area between the pink dotted lines is the energy region contributing to the current, i.e. the bias window (The shaded blue and green area on the right and left sides donate the spin up and spin down, respectively.)