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Magnetic skyrmions are chiral spin textures that hold great promise asnanoscale information carriers. Since their first observation at roomtemperature, progress has been made in their current-induced manipulation, withfast motion reported in stray-field-coupled multilayers. However, the complexspin textures with hybrid chiralities and large power dissipation in thesemultilayers limit their practical implementation and the fundamentalunderstanding of their dynamics. Here, we report on the current-driven motionof N\'eel skyrmions with diameters in the 100-nm range in an ultrathinPt/Co/MgO trilayer. We find that these skyrmions can be driven at a speed of100 m/s and exhibit a drive-dependent skyrmion Hall effect, which is accountedfor by the effect of pinning. Our experiments are well substantiated by ananalytical model of the skyrmion dynamics as well as by micromagneticsimulations including material inhomogeneities. This good agreement is enabledby the simple skyrmion spin structure in our system and a thoroughcharacterization of its static and dynamical properties.

Current-Driven Skyrmion Dynamics and Drive-Dependent Skyrmion Hall Effect in an Ultrathin Film