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Demonstration of Controlled Skyrmion Injection Across a Thickness Step.

Matthew T Littlehales1,2, Samuel H Moody1,3, Luke A Turnbull1,4

  • 1Durham University, Department of Physics, South Road, Durham, DH1 3LE, United Kingdom.

Nano Letters
|May 23, 2024
PubMed
Summary

Researchers demonstrated a new method to inject magnetic skyrmions (stable swirling magnetic structures) into thicker materials using electrical currents. This advance could enable novel spintronic devices with improved performance.

Keywords:
3D magnetic nanostructuresmagnetic skyrmionssmall-angle X-ray scattering

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Spintronic devices utilize magnetic textures, with current research focusing on 2D thin films.
  • Exploiting higher dimensionalities, such as variable thickness, offers potential for enhanced spintronic properties.
  • Magnetic skyrmions are topologically protected spin textures with potential for data storage and logic applications.

Purpose of the Study:

  • To investigate the feasibility of controlling magnetic skyrmions in variable-thickness materials.
  • To demonstrate a mechanism for injecting skyrmions across a thickness step using charge currents.
  • To explore the potential of these variable-thickness structures as building blocks for future spintronic devices.

Main Methods:

  • Fabrication of an FeGe lamella with varying thickness.
  • Utilizing charge currents to drive magnetic skyrmions across a thickness step.
  • Experimental measurements of skyrmion behavior under varying temperature and magnetic field conditions.

Main Results:

  • Demonstrated reversible injection of magnetic skyrmions from a thin region to a thicker region of an FeGe lamella.
  • Skyrmions were shown to transition from an equilibrium state to a metastable state across the thickness step.
  • Achieved skyrmion injection at a current density of 3 × 108 A m-2, significantly lower than domain wall manipulation.

Conclusions:

  • Variable-thickness structures can be used to control and inject magnetic skyrmions.
  • The demonstrated injection mechanism is efficient and operates at low current densities.
  • This work paves the way for developing skyrmion source/drain elements for advanced spintronic applications.