Current-Induced Helicity Reversal of a Single Skyrmionic Bubble Chain in a Nanostructured Frustrated Magnet

TL;DR

This study demonstrates the experimental electrical control of skyrmionic bubble helicity in a nanostructured frustrated magnet, revealing critical current thresholds and underlying mechanisms involving pinning and dipole interactions.

Contribution

It provides the first experimental observation of current-induced helicity reversal in skyrmionic bubbles within a frustrated magnetic system.

Findings

Helicity reversal achieved at current densities of 109-10^10 A/m^2.

Reversal pulse widths range from 1 microsecond to 100 nanoseconds.

Pinning effects and dipole interactions are key to the reversal process.

Abstract

Helicity indicates the in-plane magnetic-moment swirling direction of a skyrmionic configuration. The ability to reverse the helicity of a skyrmionic bubble via purely electrical means has been predicted in frustrated magnetic systems, however its experimental observation has remained challenging. Here, we experimentally demonstrate the current-driven helicity reversal of the skyrmionic bubble in a nanostructured frustrated Fe3Sn2 magnet. The critical current density required to trigger the helicity reversal is 109 - 1010 A/m2, with a corresponding pulse-width varying from 1 {\mu}s to 100 ns. Computational simulations reveal that both the pinning effect and dipole-dipole interaction play a crucial role in the helicity-reversal process.