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Skyrmionium dynamics and stability on one dimensional anisotropy patterns.

J C Bellizotti Souza1, N P Vizarim2, C J O Reichhardt3

  • 1POSMAT-Programa de Pós-Graduação em Ciência e Tecnologia de Materiais, São Paulo State University (UNESP), School of Sciences, Bauru 17033-360, SP, Brazil.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|March 27, 2025
PubMed
Summary

Disorder affects skyrmionium dynamics. Increased disorder decreases the critical current for skyrmionium to skyrmion transformation, impacting velocity and stability. Transverse shaking can enhance skyrmionium lifetime.

Keywords:
dynamicsskyrmioniumstability

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Area of Science:

  • Condensed matter physics
  • Spintronics
  • Topological matter

Background:

  • Skyrmionium, a particle-like topological spin texture, exhibits unique dynamics.
  • Understanding skyrmionium behavior in the presence of disorder is crucial for spintronic device applications.

Purpose of the Study:

  • To investigate the influence of periodic anisotropy patterns and quenched disorder on skyrmionium motion.
  • To determine the critical current densities and disorder densities for skyrmionium-skyrmion transformations and stability.

Main Methods:

  • Simulating skyrmionium driven over a periodic anisotropy landscape with varying defect densities.
  • Analyzing the effects of different current drives and transverse shaking on skyrmionium dynamics.

Main Results:

  • Skyrmionium exhibits stable motion at low defect densities, transforming into a skyrmion above a critical current.
  • Increased disorder reduces the critical current for transformation and can destabilize moving skyrmionium.
  • A reentrance effect was observed where pinned skyrmionium transforms, restabilizes, and then becomes unstable again with increasing drive.
  • Transverse shaking was found to increase the lifetime of moving skyrmionium by mitigating pinning effects.

Conclusions:

  • Disorder plays a significant role in controlling skyrmionium transformations and stability.
  • The skyrmionium-skyrmion transformation is accompanied by velocity changes and the emergence of a skyrmion Hall angle.
  • Transverse shaking offers a potential method to enhance the robustness of moving skyrmionium in disordered environments.