Skyrmionium Dynamics and Stability on One Dimensional Anisotropy Patterns

J. C. Bellizotti Souza; N. P. Vizarim; C. J. O. Reichhardt; C. Reichhardt; P. A. Venegas

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arXiv · 2501.06325

Skyrmionium Dynamics and Stability on One Dimensional Anisotropy Patterns

J. C. Bellizotti Souza·N. P. Vizarim·C. J. O. Reichhardt·C. Reichhardt·P. A. Venegas

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Abstract

We examine a skyrmionium driven over a periodic anisotropy pattern, which consists of disorder free regions and disordered regions. For small defect densities, the skyrmionium flows for an extended range of currents, and there is a critical current above which it transforms into a skyrmion. For increased amounts of quenched disorder, the current needed for the skyrmionium to transform into a skyrmion decreases, and there is a critical disorder density above which a moving skyrmionium is not stable. In the moving state, the skyrmionium to skyrmion transformation leads to a drop in the velocity and the onset of a finite skyrmion Hall angle. We also find a reentrance effect in which the pinned skyrmionium transforms into a skyrmion just above depinning, restabilizes into skyrmionium at larger drives, and becomes unstable again at large currents. We also show that adding a transverse shaking drive can increase the lifetime of a moving skyrmionium by reducing the effect of the pinning in the direction of the drive.

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J. C. Bellizotti Souza, N. P. Vizarim, C. J. O. Reichhardt, C. Reichhardt, P. A. Venegas. 2025-01-10. Skyrmionium Dynamics and Stability on One Dimensional Anisotropy Patterns. https://arxiv.org/abs/2501.06325

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