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We report on the time-resolved investigation of current- and field-induceddomain wall motion in perpendicularly magnetized microwires exhibitingasymmetric exchange interaction by means of scanning transmission x-raymicroscopy using a time step of 200 ps. Dynamical domain wall velocities on theorder of 50-100 m s$^{-1}$ were observed. The improvement in the temporalresolution allowed us to observe the absence of incubation times for the motionof the domain wall, together with indications for a negligible inertia.Furthermore, we observed that, for short current and magnetic field pulses, themagnetic domain walls do not exhibit a tilting during its motion, providing amechanism for the fast, tilt-free, motion of magnetic domain walls.

High resolution dynamic imaging of the delay- and tilt-free motion of N\'eel domain walls in perpendicularly magnetized superlattices