Crossover from Universal Depinning to Free Domain-Wall Dynamics in Ultrathin Iron Garnet Films
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arXiv
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| Auteurs principaux: | , , , , , , , , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866915653550604288 |
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| author | Jeudy, V. Gouéré, D. Beaulieu, N. Husain, S. Pardo, R. Dıaz Thiaville, A. Sampaio, J. George, J-M Anane, A. Youssef, J. Ben |
| author_facet | Jeudy, V. Gouéré, D. Beaulieu, N. Husain, S. Pardo, R. Dıaz Thiaville, A. Sampaio, J. George, J-M Anane, A. Youssef, J. Ben |
| contents | Magnetic domain walls display universal, disorder-controlled elastic dynamics at low drive, and texture-governed free motion at high drive. Here, we establish the crossover mechanism between these two regimes. Using experiments in ultrathin epitaxial iron garnet films and Landau-Lifshitz-Gilbert simulations, including disorder, thermal, and internal texture effects, we uncover a disorder- and temperature-dependent precessional flow that bridges pinned and free dynamics. We further demonstrate that the exceptionally low pinning in garnets arises from the weak coupling between domain walls and disorder, together with a correlation length that exceeds the wall width. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_04672 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Crossover from Universal Depinning to Free Domain-Wall Dynamics in Ultrathin Iron Garnet Films Jeudy, V. Gouéré, D. Beaulieu, N. Husain, S. Pardo, R. Dıaz Thiaville, A. Sampaio, J. George, J-M Anane, A. Youssef, J. Ben Other Condensed Matter Disordered Systems and Neural Networks Magnetic domain walls display universal, disorder-controlled elastic dynamics at low drive, and texture-governed free motion at high drive. Here, we establish the crossover mechanism between these two regimes. Using experiments in ultrathin epitaxial iron garnet films and Landau-Lifshitz-Gilbert simulations, including disorder, thermal, and internal texture effects, we uncover a disorder- and temperature-dependent precessional flow that bridges pinned and free dynamics. We further demonstrate that the exceptionally low pinning in garnets arises from the weak coupling between domain walls and disorder, together with a correlation length that exceeds the wall width. |
| title | Crossover from Universal Depinning to Free Domain-Wall Dynamics in Ultrathin Iron Garnet Films |
| topic | Other Condensed Matter Disordered Systems and Neural Networks |
| url | https://arxiv.org/abs/2512.04672 |