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

## TL;DR

This study demonstrates current-driven Ne9el skyrmion motion in an ultrathin film, revealing a drive-dependent skyrmion Hall effect influenced by pinning, supported by experiments, modeling, and simulations.

## Contribution

It provides new insights into skyrmion dynamics in ultrathin films with simple spin textures, highlighting the impact of pinning on the skyrmion Hall effect.

## Key findings

- Skyrmions can be driven at 100 m/s in ultrathin films.
- The skyrmion Hall effect depends on the drive due to pinning effects.
- Experimental results agree with analytical and micromagnetic models.

## Abstract

Magnetic skyrmions are chiral spin textures that hold great promise as nanoscale information carriers. Since their first observation at room temperature, progress has been made in their current-induced manipulation, with fast motion reported in stray-field-coupled multilayers. However, the complex spin textures with hybrid chiralities and large power dissipation in these multilayers limit their practical implementation and the fundamental understanding of their dynamics. Here, we report on the current-driven motion of N\'eel skyrmions with diameters in the 100-nm range in an ultrathin Pt/Co/MgO trilayer. We find that these skyrmions can be driven at a speed of 100 m/s and exhibit a drive-dependent skyrmion Hall effect, which is accounted for by the effect of pinning. Our experiments are well substantiated by an analytical model of the skyrmion dynamics as well as by micromagnetic simulations including material inhomogeneities. This good agreement is enabled by the simple skyrmion spin structure in our system and a thorough characterization of its static and dynamical properties.