Rolling at right angles: magnetic anisotropy enables dual-anisotropic active matter
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arXiv
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| Auteurs principaux: | , , , , |
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| Format: | Preprint |
| Publié: |
2025
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| _version_ | 1866912708359618560 |
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| author | Fitzgerald, Eavan Clavaud, Cécile Das, Debasish Lenton, Isaac C. D. Waitukaitis, Scott R. |
| author_facet | Fitzgerald, Eavan Clavaud, Cécile Das, Debasish Lenton, Isaac C. D. Waitukaitis, Scott R. |
| contents | We report on an experimental active matter system with motion restricted to four cardinal directions. Our particles are magnetite-doped colloidal spheres driven by the Quincke electrorotational instability. The absence of a magnetic field (|B| = 0) leads to circular trajectories interspersed with short spontaneous runs. Intermediate fields (|B| < 20 mT) linearize the motion along the axis perpendicular to B. At high magnetic fields, we observe the surprising emergence of a second, distinct linearization along the axis parallel to B. With numerical simulations, we show that this behavior can be explained by anisotropic magnetic susceptibility |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2508_05643 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Rolling at right angles: magnetic anisotropy enables dual-anisotropic active matter Fitzgerald, Eavan Clavaud, Cécile Das, Debasish Lenton, Isaac C. D. Waitukaitis, Scott R. Soft Condensed Matter We report on an experimental active matter system with motion restricted to four cardinal directions. Our particles are magnetite-doped colloidal spheres driven by the Quincke electrorotational instability. The absence of a magnetic field (|B| = 0) leads to circular trajectories interspersed with short spontaneous runs. Intermediate fields (|B| < 20 mT) linearize the motion along the axis perpendicular to B. At high magnetic fields, we observe the surprising emergence of a second, distinct linearization along the axis parallel to B. With numerical simulations, we show that this behavior can be explained by anisotropic magnetic susceptibility |
| title | Rolling at right angles: magnetic anisotropy enables dual-anisotropic active matter |
| topic | Soft Condensed Matter |
| url | https://arxiv.org/abs/2508.05643 |