Emergent Self-propulsion of Skyrmionic Matter in Synthetic Antiferromagnets
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arXiv
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| Autori principali: | , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866911112168996864 |
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| author | Silva, Clecio C. de Souza Correia, Matheus V. Velasquez, Juan C. Pina |
| author_facet | Silva, Clecio C. de Souza Correia, Matheus V. Velasquez, Juan C. Pina |
| contents | Self-propulsion plays a crucial role in biological processes and nanorobotics, enabling small systems to move autonomously in noisy environments. Here, we theoretically demonstrate that a bound skyrmion-skyrmion pair in a synthetic antiferromagnetic bilayer can function as a self-propelled topological object, reaching speeds of up to a hundred million body lengths per second--far exceeding those of any known synthetic or biological self-propelled particles. The propulsion mechanism is triggered by the excitation of back-and-forth relative motion of the skyrmions, which generates nonreciprocal gyrotropic forces, driving the skyrmion pair in a direction perpendicular to their bond. Remarkably, thermal noise induces spontaneous reorientations of the pair and momentary reversals of the propulsion, mimicking behaviors observed in motile bacteria and microalgae. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_14693 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Emergent Self-propulsion of Skyrmionic Matter in Synthetic Antiferromagnets Silva, Clecio C. de Souza Correia, Matheus V. Velasquez, Juan C. Pina Soft Condensed Matter Mesoscale and Nanoscale Physics Strongly Correlated Electrons Self-propulsion plays a crucial role in biological processes and nanorobotics, enabling small systems to move autonomously in noisy environments. Here, we theoretically demonstrate that a bound skyrmion-skyrmion pair in a synthetic antiferromagnetic bilayer can function as a self-propelled topological object, reaching speeds of up to a hundred million body lengths per second--far exceeding those of any known synthetic or biological self-propelled particles. The propulsion mechanism is triggered by the excitation of back-and-forth relative motion of the skyrmions, which generates nonreciprocal gyrotropic forces, driving the skyrmion pair in a direction perpendicular to their bond. Remarkably, thermal noise induces spontaneous reorientations of the pair and momentary reversals of the propulsion, mimicking behaviors observed in motile bacteria and microalgae. |
| title | Emergent Self-propulsion of Skyrmionic Matter in Synthetic Antiferromagnets |
| topic | Soft Condensed Matter Mesoscale and Nanoscale Physics Strongly Correlated Electrons |
| url | https://arxiv.org/abs/2508.14693 |