Microscopic theory of a precessing ferromagnet for ultrasensitive magnetometry
- URL: http://arxiv.org/abs/2503.00728v1
- Date: Sun, 02 Mar 2025 04:44:32 GMT
- Title: Microscopic theory of a precessing ferromagnet for ultrasensitive magnetometry
- Authors: Xueqi Ni, Zhixing Zou, Ruvi Lecamwasam, Andrea Vinante, Dmitry Budker, Ping Koy Lam, Tao Wang, Jiangbin Gong,
- Abstract summary: Recent works suggest that a levitated ferromagnet can beat the standard quantum limit of magnetometry.<n>This work offers a theoretical model to analyze and understand critical features of the precessing dynamics of a levitated ferromagnetic needle.
- Score: 2.691979861927084
- License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
- Abstract: 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.
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