Device geometry dependent deterministic skyrmion generation from a skyrmionium

TL;DR

This study explores how device geometry influences the deterministic creation of skyrmions from skyrmioniums using spin transfer torque, with implications for neuromorphic and unconventional computing.

Contribution

It demonstrates geometry-dependent control of skyrmion generation from skyrmioniums in various device configurations, including ferromagnetic and SAF systems.

Findings

Deterministic skyrmion generation is achievable by tuning current density.

Device geometry allows control over the number of generated skyrmions.

The method is applicable to both ferromagnetic and synthetic antiferromagnetic systems.

Abstract

A magnetic skyrmionium can be perceived as an association of two magnetic skyrmions with opposite topological charges. In this work, we have investigated the transformation of skyrmionium into multi-skyrmionic states via domain wall (DW) pairs in three different devices with variable geometric configurations. The same device geometries were considered for single ferromagnetic layer as well as synthetic antiferromagnetic (SAF) system. It is observed that by tuning the current density, deterministic generation of skyrmions is possible via the spin transfer torque (STT). The proposed device is efficiently adjustable to change the number of skyrmions . The results may lead to development of skyrmion-based devices for neuromorphic and unconventional computing.