Fig. 3

(a) Kerr images give the definition of DW tilt angle (ψ) and changes of ψ at different current densities from “up” to “down” state and “down” to “up” state, taking the Pt/Co/Ta sample as an example. DW tilt angle versus current density for Pt/Co/Ta (b) and Pt/Co/C/Ta (c). The insets in b and c represent the snapshots of the domain shape at different current densities