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Levitated Sensor for Magnetometry in Ambient Environment
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abstract
Levitated particle systems have gained significant attention as a rapidly advancing platform for precision sensing, offering low-loss, highly isolated environments by eliminating mechanical contact and associated noise. Current room-temperature levitation techniques are primarily sensitive to acceleration, with magnetic sensing often relying on the Meissner effect, which is impractical under ambient conditions. Here, we demonstrate a diamagnetically stabilized magnetically levitated magnet magnetometer (LeMaMa), where the motion of the magnet is detected optically. Leveraging strong spin-lattice coupling in the ferromagnet to suppress spin-projection noise and minimizing dissipation through levitation, we achieve a sensitivity of 32 fT $/Hz^{1/2}$. This sensitivity is adequate for a wide range of applications in biology, chemistry, and fundamental physics, matching the performance of leading technologies like SQUIDs and atomic magnetometers, while offering the distinct advantage of operating at room temperature and under Earth's magnetic field.
Forward citations
Cited by 4 Pith papers
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Levitated Milligram-scale Ferromagnetic Magnetometer at Room Temperature
A room-temperature diamagnetically levitated 60-mg ferromagnet achieves 23 fT/√Hz magnetic sensitivity near 153 Hz, validated by two independent calibrations and limited by vibration noise.
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Quantum dynamics of a levitated ferromagnetic gyroscope
Quantized precession and libration of a levitated ferromagnetic gyroscope are described by a spin-rotor Hamiltonian, with rf fields driving transitions between discrete angular-momentum and librational levels.
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Searching for Ultralight Dark Matter with MOLeQuTE: a Massive Optically Levitated Quantum Tabletop Experiment
A proposed optically levitated milligram-scale plate sensor could reach the standard quantum limit and probe new parameter space for ultralight B-L vector dark matter.
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Levitated macroscopic rotors with 10 hours of free spin at room temperature
A millimeter-scale graphite rotor, diamagnetically levitated in vacuum, spins with a 3.85 μHz damping rate and doubles as a gyroscope with a model-based noise floor of 0.0065 deg/s.
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