Skyrmionium Dynamics and Stability on One Dimensional Anisotropy Patterns
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arXiv
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2025
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| author | Souza, J. C. Bellizotti Vizarim, N. P. Reichhardt, C. J. O. Reichhardt, C. Venegas, P. A. |
| author_facet | Souza, J. C. Bellizotti Vizarim, N. P. Reichhardt, C. J. O. Reichhardt, C. Venegas, P. A. |
| contents | 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. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2501_06325 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Skyrmionium Dynamics and Stability on One Dimensional Anisotropy Patterns Souza, J. C. Bellizotti Vizarim, N. P. Reichhardt, C. J. O. Reichhardt, C. Venegas, P. A. Mesoscale and Nanoscale Physics 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. |
| title | Skyrmionium Dynamics and Stability on One Dimensional Anisotropy Patterns |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2501.06325 |