Direct Observation of Massless Domain Wall Dynamics in Nanostripes with Perpendicular Magnetic Anisotropy

Abstract

Domain wall motion induced by nanosecond current pulses in nanostripes with perpendicular magnetic anisotropy (Pt/Co/AlO${}_x$) is shown to exhibit negligible inertia. Time-resolved magnetic microscopy during current pulses reveals that the domain walls start moving, with a constant speed, as soon as the current reaches a constant amplitude, and no or little motion takes place after the end of the pulse. The very low 'mass' of these domain walls is attributed to the combination of their narrow width and high damping parameter $\alpha$. Such a small inertia should allow accurate control of domain wall motion, by tuning the duration and amplitude of the current pulses.

References in corpus (4)

• High domain wall velocities induced by current in ultrathin Pt/Co/AlOx wires with perpendicular magnetic anisotropy
• The domain wall spin torque-meter
• High domain wall velocity at zero magnetic field induced by low current densities in spin-valve nanostripes
• Direct observation of Oersted-field-induced magnetization dynamics in magnetic nanostripes

Cited by in corpus (4)

• Current-driven domain wall dynamics in ferrimagnets: micromagnetic approach and collective coordinates model
• Current-driven domain wall dynamics in ferromagnetic layers synthetically exchange-coupled by a spacer: A micromagnetic study
• Asymmetric velocity and tilt angle of domain walls induced by spin-orbit torques
• Systematic motion of magnetic domain walls in notched nanowires under ultra-short current pulses