Fig. 3: Field-induced DW motion.

a. The experimentally measured DW velocity as a function of H_Z (black symbols). The lines are the results of the model with DMI only (black) or including α_c (blue and red). The model reproduces accurately the velocity data in the flow regime (the region with constant DW mobility). The inset shows a typical differential Kerr image. The bright ring represents the DW displacement produced by the field pulse. b. Measured DW velocity vs. H_ip (red for down/up DW, blue for up/down DW, see Fig. S8 for detailed Kerr images) at constant H_Z = −82 mT and c. H_Z = −55 mT. The inset is a zoom of the low field region where the crossing of two curves occurs. d, e, f, Calculated DW velocity with (d) H_Z = −82 mT and α_c = 0.4; (e) H_Z = −82 mT and α_c = 0.4 + 0.2·m_x. (f) H_Z = −55 mT and inset H_Z = −10 mT.