# Current-driven Dynamics of Magnetic Skyrmion in Chiral Ferromagnetic Film with Spatially Modulated Dzyaloshinskii-Moriya Interaction

## TL;DR

This paper theoretically investigates how spatially modulated Dzyaloshinskii-Moriya interaction influences the current-driven dynamics of magnetic skyrmions in chiral ferromagnetic films, revealing controllable skyrmion behavior for spintronics applications.

## Contribution

It introduces a theoretical framework for understanding skyrmion dynamics under spatially varying Dzyaloshinskii-Moriya interaction, enabling manipulation via material engineering.

## Key findings

- Skyrmion size and velocity can be increased or decreased by different modulation patterns.
- The Thiele equation effectively explains the observed phenomena.
- Spatial modulation of Dzyaloshinskii-Moriya interaction offers a way to control skyrmion motion.

## Abstract

The dynamics of magnetic skyrmion driven by spin-polarized current is theoretically studied in the chiral ferromagnetic film with spatially modulated Dzyaloshinskii-Moriya interaction. Three cases including linear, sinusoidal, and periodic rectangular modulations have been considered, where the increase, decrease, and the periodic modification of the size and velocity of the skyrmion have been observed in the microscopic simulations. These phenomena are well explained by the Thiele equation, where an effective force on the skyrmion is induced by the inhomogeneous Dzyaloshinskii-Moriya interaction. The results here suggest that the dynamics of skyrmion can be manipulated by artificially tuning the Dzyaloshinskii-Moriya interaction in chiral ferromagnetic film with material engineering methods, which will be useful to design skyrmion-based spintronics devices.