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| Main Authors: | , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2511.06777 |
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| _version_ | 1866915637204353024 |
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| author | Zhu, Shiwei Guan, Xinyuan Sun, Zhen Zhang, Qiuyao Song, Changsheng |
| author_facet | Zhu, Shiwei Guan, Xinyuan Sun, Zhen Zhang, Qiuyao Song, Changsheng |
| contents | We uncover a universal two-stage dynamics during skyrmion formation and establish its connection to equilibrium phases through the introduction of a chiral correlation $χ$. Stage I involves stripe coarsening governed by the exchange-to-DMI ratio $J'$, while stage II entails stripe contraction driven by the synergy between $J'$ and the anisotropy-to-DMI ratio $K'$. The magnetic field-to-DMI ratio $B'$ influences both stages. By combining symbolic regression with neural networks, we model the competition and cooperation among these parameters and derive a skyrmion formation criterion, $0.58 K'J' + μB'J' > 1$. Our model disentangles their distinct roles: $J'$ sets the stripe width, $K'$ primarily controls the skyrmion size, and $B'$ strongly affects the topological charge. This approach provides a general framework for predicting and controlling magnetic phases in chiral magnets. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_06777 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Universal two-stage dynamics and phase control in skyrmion formation Zhu, Shiwei Guan, Xinyuan Sun, Zhen Zhang, Qiuyao Song, Changsheng Mesoscale and Nanoscale Physics We uncover a universal two-stage dynamics during skyrmion formation and establish its connection to equilibrium phases through the introduction of a chiral correlation $χ$. Stage I involves stripe coarsening governed by the exchange-to-DMI ratio $J'$, while stage II entails stripe contraction driven by the synergy between $J'$ and the anisotropy-to-DMI ratio $K'$. The magnetic field-to-DMI ratio $B'$ influences both stages. By combining symbolic regression with neural networks, we model the competition and cooperation among these parameters and derive a skyrmion formation criterion, $0.58 K'J' + μB'J' > 1$. Our model disentangles their distinct roles: $J'$ sets the stripe width, $K'$ primarily controls the skyrmion size, and $B'$ strongly affects the topological charge. This approach provides a general framework for predicting and controlling magnetic phases in chiral magnets. |
| title | Universal two-stage dynamics and phase control in skyrmion formation |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2511.06777 |