# Current-driven dynamics and inhibition of the skyrmion Hall effect of ferrimagnetic skyrmions in GdFeCo films

## TL;DR

This study demonstrates the stabilization and current-driven motion of ferrimagnetic skyrmions in GdFeCo films, showing reduced skyrmion Hall effect and potential for advanced spintronic applications.

## Contribution

It provides experimental evidence of ferrimagnetic skyrmions' dynamics and their reduced Hall effect, confirming theoretical predictions in a practical material system.

## Key findings

- Skyrmions in Gd and FeCo layers are antiferromagnetically exchange-coupled.
- Ferrimagnetic skyrmions move at ~50 m/s with a skyrmion Hall angle of ~20°.
- Experimental validation of theoretical models on ferrimagnetic skyrmion dynamics.

## Abstract

Magnetic skyrmions are swirling magnetic textures with novel characteristics suitable for future spintronic and topological applications. Recent studies confirmed the room-temperature stabilization of skyrmions in ultrathin ferromagnets. However, such ferromagnetic skyrmions show undesirable topological effect, the skyrmion Hall effect, which leads to their current-driven motion towards device edges, where skyrmions could easily be annihilated by topographic defects. Recent theoretical studies have predicted enhanced current-driven behaviour for antiferromagnetically exchange-coupled skyrmions. Here we present the stabilization of these skyrmions and their current-driven dynamics in ferrimagnetic GdFeCo films. By utilizing element-specific X-ray imaging, we find that the skyrmions in the Gd and FeCo sublayers are antiferromagnetically exchange-coupled. We further confirm that ferrimagnetic skyrmions can move at a velocity of ~50 m s-1 with reduced skyrmion Hall angle, {\theta}SkHE ~20{\deg}. Our findings open the door to ferrimagnetic and antiferromagnetic skyrmionics while providing key experimental evidences of recent theoretical studies.

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Source: https://tomesphere.com/paper/1703.10310