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We calibrated Thiele model simulations for magnetic skyrmion dynamics, enabling quantitative analysis of pinning landscapes and diffusion. This allows precise inference of forces acting on skyrmions using ultralow current densities.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Computational Physics

Background:

  • Magnetic skyrmions are topologically protected spin textures with potential applications in data storage and neuromorphic computing.
  • Simulating magnetic skyrmion dynamics accurately on large length and time scales is crucial for experimental validation and device design.
  • Existing models often lack key parameters to bridge the gap between simulation and experimental observations.

Purpose of the Study:

  • To develop a fully quantitative Thiele model for magnetic skyrmion dynamics.
  • To enable simulations on experimentally relevant large length and time scales.
  • To determine spatial pinning energy landscapes for skyrmion diffusion studies.

Main Methods:

  • Ascertaining missing parameters to calibrate experimental and simulation timescales.
  • Calibrating current-induced forces acting on magnetic skyrmions.
  • Utilizing the Lifson-Jackson framework for diffusion quantification in arbitrary potentials.

Main Results:

  • Demonstrated fully quantitative Thiele model simulations of magnetic skyrmion dynamics.
  • Achieved simulations on previously unattainable large length and time scales.
  • Determined complete spatial pinning energy landscapes.
  • Inferred total force on skyrmions by isolating ultralow current density (10^6 A/m^2) generated torques.

Conclusions:

  • The developed method allows for precise quantification of experimental studies on skyrmion diffusion.
  • Enables accurate modeling of skyrmion behavior under ultralow current densities.
  • Provides a pathway for direct inference of forces acting on skyrmions, advancing quantitative magnetic skyrmion research.