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| Auteurs principaux: | , , , , , , |
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| Format: | Preprint |
| Publié: |
2025
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| Sujets: | |
| Accès en ligne: | https://arxiv.org/abs/2509.02384 |
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| _version_ | 1866909766638370816 |
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| author | Toledo-Marin, Jose Castro, Mario Galvez-Poblete, David Grossi, Bruno Castillo-Sepúlveda, Sebastián Nunez, Alvaro S. Allende, Sebastian |
| author_facet | Toledo-Marin, Jose Castro, Mario Galvez-Poblete, David Grossi, Bruno Castillo-Sepúlveda, Sebastián Nunez, Alvaro S. Allende, Sebastian |
| contents | Magnetic bimerons in a domain wall provide a practical route for current driven transport in patterned magnetic stripes. However, coupling between bimerons and pinning by defects complicate reliable motion. Here we show that a periodic array of edge defects both stabilizes transport of multiple bimerons and gives rise to a distinctive collective state, the magnetic worm. A single bimeron travels at constant speed; defects lower this speed while preserving an approximately linear relation between velocity $v$ and current density $J$. With two bimerons, the center of mass advances nearly uniformly while their separation exhibits a bounded oscillation whose frequency increases and amplitude decreases with current. For larger trains, these oscillations lose synchrony, producing segmented, worm like motion. The center of mass speed grows with current but decreases as the number of bimerons increases. Notably, eight bimerons cannot be sustained in a smooth stripe but can be stabilized by the periodic defects |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_02384 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Magnetic Worms: Oscillatory Bimeron Pairing And Collective Transport In Patterned Stripes Toledo-Marin, Jose Castro, Mario Galvez-Poblete, David Grossi, Bruno Castillo-Sepúlveda, Sebastián Nunez, Alvaro S. Allende, Sebastian Mesoscale and Nanoscale Physics Magnetic bimerons in a domain wall provide a practical route for current driven transport in patterned magnetic stripes. However, coupling between bimerons and pinning by defects complicate reliable motion. Here we show that a periodic array of edge defects both stabilizes transport of multiple bimerons and gives rise to a distinctive collective state, the magnetic worm. A single bimeron travels at constant speed; defects lower this speed while preserving an approximately linear relation between velocity $v$ and current density $J$. With two bimerons, the center of mass advances nearly uniformly while their separation exhibits a bounded oscillation whose frequency increases and amplitude decreases with current. For larger trains, these oscillations lose synchrony, producing segmented, worm like motion. The center of mass speed grows with current but decreases as the number of bimerons increases. Notably, eight bimerons cannot be sustained in a smooth stripe but can be stabilized by the periodic defects |
| title | Magnetic Worms: Oscillatory Bimeron Pairing And Collective Transport In Patterned Stripes |
| topic | Mesoscale and Nanoscale Physics |
| url | https://arxiv.org/abs/2509.02384 |