Controlled creation of nanometric skyrmions using external magnetic fields

TL;DR

This paper proposes a theoretical method for controlled creation of individual nanometric skyrmions at specific locations using external magnetic fields and engineered defects, potentially enabling low-energy high-density storage devices.

Contribution

It introduces a novel approach utilizing fabricated holes or notches to catalyze skyrmion creation, reducing energy barriers and allowing precise control.

Findings

Fabricated defects act as catalysts for skyrmion creation.

External magnetic fields can be used to control skyrmion formation.

The method enables targeted skyrmion creation with low energy input.

Abstract

To exploit nanometric magnetic skyrmions as information carriers in high-density storage devices, a method is needed that creates intended number of skyrmions at specified places in the device preferably at a low energy cost. We theoretically propose that using a system with a fabricated hole or notch, the controlled creation of individual skyrmions can be achieved even when using an external magnetic field applied to the entire specimen. The fabricated defect turns out to work like a catalyst to reduce the energy barrier for the skyrmion creation.