Microscopic theory of a precessing ferromagnet for ultrasensitive magnetometry

Levitated systems have great potential in quantum sensing and exploring fundamental physics at the macroscopic scale. Of particular interest are recent works suggesting that a levitated ferromagnet can beat the standard quantum limit of magnetometry, a benchmark for quantum sensors. In this work, we show how a microscopic theory capturing atomic-scale spin-lattice interactions can be used to fully explain the emergence of collective precession dynamics of a levitated ferromagnet and the origin of its enhanced magnetometric sensitivity beyond that of independent spins. Our theory further takes us to two innovative 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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Publication Details

Journal
Physical Review Research
Published
2025-09-26
DOI
https://doi.org/10.1103/1v1p-kpb2
Citations
2
Primary Topic
Topological Materials and Phenomena
Type
article
Field-Weighted Citation Impact
2.49
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article

Microscopic theory of a precessing ferromagnet for ultrasensitive magnetometry

Andrea Vinante, Zhigang Zou, Tao Wang, Dmitry Budker et al.
2 citations
Physical Review Research
Topological Materials and Phenomena
2.49
article

Microscopic theory of a precessing ferromagnet for ultrasensitive magnetometry

Andrea Vinante, Zhigang Zou, Tao Wang, Dmitry Budker, Xueqi Ni, Ruvi Lecamwasam, Ping Koy Lam, Jiangbin Gong
article en
2 citations

Abstract

Levitated systems have great potential in quantum sensing and exploring fundamental physics at the macroscopic scale. Of particular interest are recent works suggesting that a levitated ferromagnet can beat the standard quantum limit of magnetometry, a benchmark for quantum sensors. In this work, we show how a microscopic theory capturing atomic-scale spin-lattice interactions can be used to fully explain the emergence of collective precession dynamics of a levitated ferromagnet and the origin of its enhanced magnetometric sensitivity beyond that of independent spins. Our theory further takes us to two innovative 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.

Physical Review ResearchVol. 7(4)
Centre for Quantum Technologies (SG), Australian National University (AU), National University of Singapore (SG), GSI Helmholtz Centre for Heavy Ion Research (DE), Johannes Gutenberg University Mainz (DE), Fondazione Bruno Kessler (IT), Centre for Quantum Computation and Communication Technology (AU), Helmholtz Institute Mainz (DE), Institute of Materials Research and Engineering (SG), Istituto di Fotonica e Nanotecnologie (IT), University of California, Berkeley (US)
Openalex Percentile: Top 10%
Topological Materials and Phenomena
2.49
DOIOpen Access PDFOpenAlex
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