Effects of interlayer Dzyaloshinskii-Moriya interaction on the shape and dynamics of magnetic twin-skyrmions

TL;DR

This paper investigates how interlayer Dzyaloshinskii-Moriya interaction affects the shape, stability, and dynamics of magnetic twin-skyrmions in bilayer systems, revealing new ways to manipulate skyrmions for data storage.

Contribution

It demonstrates the influence of interlayer Dzyaloshinskii-Moriya interaction on twin-skyrmion configurations and their current-driven dynamics, offering novel insights for skyrmion-based applications.

Findings

Twin-skyrmion shape adapts to IL-DMI direction.

Skyrmion velocity and Hall angle depend on current polarization.

IL-DMI enables new skyrmion manipulation strategies.

Abstract

Magnetic skyrmions have been proposed as promising candidates for storing information due to their high stability and easy manipulation by spin-polarized currents. Here, we study how these properties are influenced by the interlayer Dzyaloshinskii--Moriya interaction (IL-DMI), which stabilizes twin-skyrmions in magnetic bilayers. We find that the spin configuration of the twin-skyrmion adapts to the direction of the IL-DMI by elongating or changing the helicities in the two layers. Driving the skyrmions by spin-polarized currents in the current-perpendicular-to-plane configuration, we observe significant changes either in the skyrmion velocity or in the skyrmion Hall angle depending on the current polarization. These findings unravel further prospects for skyrmion manipulation enabled by the IL-DMI.