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An Improved Racetrack Structure for Transporting a Skyrmion.

P Lai^1,2, G P Zhao^1,3, H Tang¹

¹College of Physics and Electronic Engineering, Sichuan Normal University, Chengdu 610101, China.

Scientific Reports

|March 31, 2017

Summary

New racetrack designs confine magnetic skyrmions (data bits) using high-K materials, preventing data loss. This enables ultrafast, energy-efficient skyrmion transport for next-generation data storage.

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Area of Science:

Condensed Matter Physics
Materials Science
Nanotechnology

Background:

Magnetic skyrmions offer potential for next-generation data storage due to their stability and small size.
Traditional racetrack memory designs face challenges with skyrmion drift and annihilation at edges, leading to information loss.

Purpose of the Study:

To propose and validate a novel skyrmion-based racetrack structure that enhances skyrmion confinement and stability.
To overcome skyrmion clogging and annihilation issues in racetrack memory devices.

Main Methods:

Micromagnetic simulations were employed to analyze skyrmion behavior within the proposed racetrack structure.
Phase diagrams were calculated to map skyrmion motion under varying current densities and racetrack edge widths.

Main Results:

The proposed design effectively confines skyrmions to the center of the racetrack using high-K materials at the edges.
Simulations demonstrated the overcoming of both skyrmion clogging (at low currents) and annihilation (at high currents).
Skyrmions were driven at high speeds (approx. 300 m/s) with relatively low driving currents.

Conclusions:

The novel racetrack design with high-K material edges provides an efficient method for skyrmion confinement and transport.
This approach facilitates the development of ultrafast and energy-efficient skyrmion-based data storage devices.