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Skyrmions near defects.

Amel Derras-Chouk1, Eugene M Chudnovsky1

  • 1Physics Department, Herbert H. Lehman College and Graduate School, The City University of New York, 250 Bedford Park Boulevard West, Bronx, New York 10468-1589, United States of America.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|February 4, 2021
PubMed
Summary
This summary is machine-generated.

We investigated how defects affect magnetic skyrmions in thin films. Defects attract skyrmions, causing them to spiral and deform, potentially transforming into snake-like domains near stability boundaries.

Keywords:
defectmicromagneticpinningskyrmion

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Magnetic skyrmions are topologically protected spin textures with potential applications in data storage and spintronics.
  • Understanding their behavior in confined geometries and near defects is crucial for device development.

Purpose of the Study:

  • To investigate the influence of an exchange-reducing defect on the dynamics and stability of magnetic skyrmions in a finite-thickness thin film.
  • To explore skyrmion-defect interactions and the conditions leading to skyrmion transformation.

Main Methods:

  • Micromagnetic energy calculations considering exchange, Dzyaloshinskii-Moriya interaction, magnetic anisotropy, and dipole-dipole coupling.
  • Numerical solutions of the Landau-Lifshitz-Gilbert equations on a lattice.
  • Independent verification using the Thiele equation.
  • Investigation of current-induced depinning.

Main Results:

  • Demonstrated attraction of skyrmions to the exchange-reducing defect.
  • Observed spiraling dynamics of skyrmions towards the defect, consistent across different numerical methods.
  • Found that skyrmions deform near the defect, with deformation increasing significantly near the phase boundary.
  • Observed transformation of skyrmions into snake-like magnetic domains under specific conditions.

Conclusions:

  • Exchange-reducing defects act as pinning sites and can significantly alter skyrmion behavior.
  • Skyrmion deformation and transformation near defects are strongly dependent on proximity to the stability phase boundary.
  • The findings provide insights into controlling skyrmion dynamics for potential spintronic applications.