Proposed controlled creation and manipulation of skyrmions with spin-orbit torque

TL;DR

This paper proposes a theoretical method for controlled creation, manipulation, and deletion of magnetic skyrmions using spin-orbit torque in a three-terminal heterojunction, advancing spintronic memory technology.

Contribution

It introduces a novel theoretical approach for skyrmion control via spin-orbit torque in notched nanotracks, addressing a key challenge in skyrmion-based device design.

Findings

Proposes a method for skyrmion creation using spin-orbit torque.

Provides insights into skyrmion manipulation in heterojunctions.

Highlights potential for skyrmion-based spintronic memory applications.

Abstract

The physical mechanisms underlying current-driven skyrmion motion include the spin-transfer torque exerted by a spin-polarized horizontal electric current and the spin-orbit torque exerted by a perpendicular spin current. Each mechanism requires a specific sample geometry and structural configuration. Regarding current-induced skyrmion creation, skyrmions can be efficiently created at low current densities via spin-transfer torque when an electric current is applied to a nanotrack structure with a small notch. However, an effective and controlled method for skyrmion creation via spin-orbit torque in notched nanotracks has yet to be established. Here we theoretically propose a method for the creation, driving, and deletion of skyrmions in a three-terminal magnetic heterojunction with a notch. Our proposal offers valuable insights into the design of techniques for skyrmion creation and manipulation using spin-orbit torque, which is essential for technical applications of magnetic skyrmions as information carriers in next-generation spintronic memory devices.