Microscopic theory of a precessing ferromagnet for ultrasensitive magnetometry
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arXiv
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| Hauptverfasser: | , , , , , , , |
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| Format: | Preprint |
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2025
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| author | Ni, Xueqi Zou, Zhixing Lecamwasam, Ruvi Vinante, Andrea Budker, Dmitry Lam, Ping Koy Wang, Tao Gong, Jiangbin |
| author_facet | Ni, Xueqi Zou, Zhixing Lecamwasam, Ruvi Vinante, Andrea Budker, Dmitry Lam, Ping Koy Wang, Tao Gong, Jiangbin |
| contents | Levitated systems have great potential in quantum sensing and exploring quantum effects at the macroscopic scale. Of particular interest are recent works suggesting that a levitated ferromagnet can beat the standard quantum limit of magnetometry. This work offers a theoretical model to analyze and understand critical features of the precessing dynamics of a levitated ferromagnetic needle, indeed much like a macrospin, in the presence of a weak magnetic field. The dynamics from the atomic scale reveals how the standard quantum limit is surpassed, thus verifying sensing advantages when compared with a collection of independent spins. Our theory further takes us to two additional experimental designs of immediate interest: measurement of the celebrated Berry phase with a precessing ferromagnetic needle and the use of its nutation motion to sense a low-frequency oscillating magnetic field. With a microscopic theory established for levitated ferromagnetic needles, future studies of macroscopic quantum effects and the associated quantum-classical transition also become possible. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_00728 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Microscopic theory of a precessing ferromagnet for ultrasensitive magnetometry Ni, Xueqi Zou, Zhixing Lecamwasam, Ruvi Vinante, Andrea Budker, Dmitry Lam, Ping Koy Wang, Tao Gong, Jiangbin Quantum Physics Levitated systems have great potential in quantum sensing and exploring quantum effects at the macroscopic scale. Of particular interest are recent works suggesting that a levitated ferromagnet can beat the standard quantum limit of magnetometry. This work offers a theoretical model to analyze and understand critical features of the precessing dynamics of a levitated ferromagnetic needle, indeed much like a macrospin, in the presence of a weak magnetic field. The dynamics from the atomic scale reveals how the standard quantum limit is surpassed, thus verifying sensing advantages when compared with a collection of independent spins. Our theory further takes us to two additional experimental designs of immediate interest: measurement of the celebrated Berry phase with a precessing ferromagnetic needle and the use of its nutation motion to sense a low-frequency oscillating magnetic field. With a microscopic theory established for levitated ferromagnetic needles, future studies of macroscopic quantum effects and the associated quantum-classical transition also become possible. |
| title | Microscopic theory of a precessing ferromagnet for ultrasensitive magnetometry |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2503.00728 |