Ultrafast Néel vector switching
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arXiv
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| Auteurs principaux: | , , , , , |
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| Format: | Preprint |
| Publié: |
2026
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| _version_ | 1866914447739584512 |
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| author | Harris-Lee, Eddie Ivor Dewhurst, John Kay Chen, Wenhan Hu, Shiqi Shallcross, Samuel Sharma, Sangeeta |
| author_facet | Harris-Lee, Eddie Ivor Dewhurst, John Kay Chen, Wenhan Hu, Shiqi Shallcross, Samuel Sharma, Sangeeta |
| contents | We predict ultrafast switching in a chiral anti-ferromagnet that occurs at femtosecond times, nearly 5 orders of magnitude faster than the torque induced nanosecond switching previously observed. The physical mechanism, quite different from that which drives slow switching, involves the creation of massive effective magnetic fields by ultrafast spin current injection. Identifying these fields as key to femtosecond rotation, we establish simple practical rules for their maximisation with wide applicability to all magnetised materials. Employing state-of-the-art time-dependent density-functional theory and using the example of chiral magnet, Mn$_3$Sn, we induce ultrafast rotation enough to drive the switching of magnetic order between the six possible non-collinear ground states. We further demonstrate the possibility of undoing this switching by subsequent injection of oppositely polarized spin current. Our findings place chiral anti-ferromagnets as a materials platform for femtosecond Néel-vector switching, opening a route towards the manipulation of magnetic matter at ultrafast times. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2604_04203 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Ultrafast Néel vector switching Harris-Lee, Eddie Ivor Dewhurst, John Kay Chen, Wenhan Hu, Shiqi Shallcross, Samuel Sharma, Sangeeta Materials Science Other Condensed Matter We predict ultrafast switching in a chiral anti-ferromagnet that occurs at femtosecond times, nearly 5 orders of magnitude faster than the torque induced nanosecond switching previously observed. The physical mechanism, quite different from that which drives slow switching, involves the creation of massive effective magnetic fields by ultrafast spin current injection. Identifying these fields as key to femtosecond rotation, we establish simple practical rules for their maximisation with wide applicability to all magnetised materials. Employing state-of-the-art time-dependent density-functional theory and using the example of chiral magnet, Mn$_3$Sn, we induce ultrafast rotation enough to drive the switching of magnetic order between the six possible non-collinear ground states. We further demonstrate the possibility of undoing this switching by subsequent injection of oppositely polarized spin current. Our findings place chiral anti-ferromagnets as a materials platform for femtosecond Néel-vector switching, opening a route towards the manipulation of magnetic matter at ultrafast times. |
| title | Ultrafast Néel vector switching |
| topic | Materials Science Other Condensed Matter |
| url | https://arxiv.org/abs/2604.04203 |