# Skyrmion Racetrack memory with an antidot

## TL;DR

This paper proposes a novel micromagnetic simulation method to generate and manipulate skyrmions in a nanotrack using triangular antidots and local Oersted fields, enabling decoupled skyrmion creation and propagation.

## Contribution

It introduces a new design for skyrmion racetrack memory utilizing antidots and local fields to control skyrmion generation and movement independently.

## Key findings

- Controlled skyrmion injection achieved via antidot dimensions
- Multiple skyrmions generated simultaneously with additional antidots
- Decoupled skyrmion creation and propagation demonstrated

## Abstract

Skyrmion racetrack memory has a lots of potential in future non-volatile solid state devices. In general such devices require current to nucleate skyrmions via spin transfer torque (STT) effect. Further the current is also required to drive the skyrmions in the nanowire device. However the current applied during nucleation of successive skyrmions may have unwanted perturbation \emph{viz.} Joule heating and skyrmion Hall effect, on the propagation of previously generated skyrmions. Therefore new methodology is required to decouple the generation and propagation of skyrmions. Here we present a novel route via micromagnetic simulation for generation of skyrmions from triangular antidot structure in a ferromagnetic nanotrack using local oersted field. Antidots are holes in a magnetic nanoelement. Controlled skyrmion injection can be achieved by tuning the dimensions of the antidots that are placed at either end of the nanotrack. Multiple skyrmions can be simultaneously generated by incorporating more number of antidots. Here we propose a novel design to realise skyrmionic racetrcak memory where one can individually generate and manipulate the skyrmions within the nanotrack.