Earthquake-like dynamics in ultrathin magnetic film
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arXiv
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| Autores principales: | , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2023
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| _version_ | 1866916345218596864 |
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| author | Durin, Gianfranco Schimmenti, Vincenzo Maria Baiesi, Marco Casiraghi, Arianna Magni, Alessandro Herrera-Diez, Liza Ravelosona, Dafiné Foini, Laura Rosso, Alberto |
| author_facet | Durin, Gianfranco Schimmenti, Vincenzo Maria Baiesi, Marco Casiraghi, Arianna Magni, Alessandro Herrera-Diez, Liza Ravelosona, Dafiné Foini, Laura Rosso, Alberto |
| contents | We study the motion of a domain wall on an ultrathin magnetic film using the magneto-optical Kerr effect (MOKE). At tiny magnetic fields, the wall creeps only via thermal activation over the pinning centers present in the sample. Our results show that this creep dynamics is highly intermittent and correlated. A localized instability triggers a cascade, akin to aftershocks following a large earthquake, where the pinned wall undergoes large reorganizations in a compact active region for a few seconds. Surprisingly, the size and shape of these reorganizations display the same scale-free statistics of the depinning avalanches in agreement with the quenched Kardar-Parisi-Zhang universality class. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2309_12898 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Earthquake-like dynamics in ultrathin magnetic film Durin, Gianfranco Schimmenti, Vincenzo Maria Baiesi, Marco Casiraghi, Arianna Magni, Alessandro Herrera-Diez, Liza Ravelosona, Dafiné Foini, Laura Rosso, Alberto Materials Science Mesoscale and Nanoscale Physics Statistical Mechanics We study the motion of a domain wall on an ultrathin magnetic film using the magneto-optical Kerr effect (MOKE). At tiny magnetic fields, the wall creeps only via thermal activation over the pinning centers present in the sample. Our results show that this creep dynamics is highly intermittent and correlated. A localized instability triggers a cascade, akin to aftershocks following a large earthquake, where the pinned wall undergoes large reorganizations in a compact active region for a few seconds. Surprisingly, the size and shape of these reorganizations display the same scale-free statistics of the depinning avalanches in agreement with the quenched Kardar-Parisi-Zhang universality class. |
| title | Earthquake-like dynamics in ultrathin magnetic film |
| topic | Materials Science Mesoscale and Nanoscale Physics Statistical Mechanics |
| url | https://arxiv.org/abs/2309.12898 |