Twisting Light, Steering Spins: Gold Nanoparticle Magnetization via Inverse Faraday and Orbital Angular Momentum
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arXiv
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| Autori principali: | , , |
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| Natura: | Preprint |
| Pubblicazione: |
2025
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| _version_ | 1866908294348537856 |
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| author | Yang, Xingyu Harreau, Chantal Mivelle, Mathieu |
| author_facet | Yang, Xingyu Harreau, Chantal Mivelle, Mathieu |
| contents | We present a new approach to controlling magnetization in gold nanoparticles using the Inverse Faraday Effect combined with Laguerre-Gauss beams carrying orbital angular momentum. By tailoring the tilt of isophase planes, we induce drift photocurrents that generate magnetic fields tilted by up to 25° relative to the beam axis. The magnetic orientation can be reversed by switching polarization chirality or the orbital angular momentum sign, and it can be rotated azimuthally by repositioning the particle, accessing any angle over 2π steradians. This unprecedented level of control extends all-optical magnetization to three-dimensional orientations, potentially at ultrafast timescales given the near-instantaneous nature of the Inverse Faraday Effect. Our results pave the way for advanced spin-based applications, from triggering spin waves in magnetic materials to designing next-generation magnetic memory and logic devices. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_00976 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Twisting Light, Steering Spins: Gold Nanoparticle Magnetization via Inverse Faraday and Orbital Angular Momentum Yang, Xingyu Harreau, Chantal Mivelle, Mathieu Optics Materials Science We present a new approach to controlling magnetization in gold nanoparticles using the Inverse Faraday Effect combined with Laguerre-Gauss beams carrying orbital angular momentum. By tailoring the tilt of isophase planes, we induce drift photocurrents that generate magnetic fields tilted by up to 25° relative to the beam axis. The magnetic orientation can be reversed by switching polarization chirality or the orbital angular momentum sign, and it can be rotated azimuthally by repositioning the particle, accessing any angle over 2π steradians. This unprecedented level of control extends all-optical magnetization to three-dimensional orientations, potentially at ultrafast timescales given the near-instantaneous nature of the Inverse Faraday Effect. Our results pave the way for advanced spin-based applications, from triggering spin waves in magnetic materials to designing next-generation magnetic memory and logic devices. |
| title | Twisting Light, Steering Spins: Gold Nanoparticle Magnetization via Inverse Faraday and Orbital Angular Momentum |
| topic | Optics Materials Science |
| url | https://arxiv.org/abs/2504.00976 |