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<p>Precise magnetic field sensing is important for both weak-field metrology and searches for exotic interactions. Levitated ferromagnetic systems are promising for this purpose because mechanical isolation suppresses contact-induced noise. For short-range searches, however, it remains important to establish whether such platforms can provide useful magnetic sensitivity while retaining a compact sensing volume. Here we show that a levitated ferromagnetic torsion oscillator operates as a compact room-temperature magnetometer with a sensor volume of (2.5 mm)<sup>3</sup> and a magnetic sensitivity of 391&#xa0;±&#xa0;59 fT&#xa0;⋅&#xa0;Hz<sup>−1/2</sup> at 4.99 Hz. We further show that its compact sensing volume and magnetic sensitivity make it suitable for probing short-range spin-dependent interactions through pseudomagnetic-field detection. This work establishes a compact approach to precision magnetometry and provides a basis for future searches for exotic interactions.</p>

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Levitated Ferromagnetic Torsional Oscillators for High-Precision Magnetometry and Probing Exotic Interactions

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年4月28日

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  • Yichong Ren,
  • Lielie Wu,
  • Wijnand Broer,
  • Fei Xue,
  • Pu Huang,
  • Jiangfeng Du

摘要

Precise magnetic field sensing is important for both weak-field metrology and searches for exotic interactions. Levitated ferromagnetic systems are promising for this purpose because mechanical isolation suppresses contact-induced noise. For short-range searches, however, it remains important to establish whether such platforms can provide useful magnetic sensitivity while retaining a compact sensing volume. Here we show that a levitated ferromagnetic torsion oscillator operates as a compact room-temperature magnetometer with a sensor volume of (2.5 mm)3 and a magnetic sensitivity of 391 ± 59 fT ⋅ Hz−1/2 at 4.99 Hz. We further show that its compact sensing volume and magnetic sensitivity make it suitable for probing short-range spin-dependent interactions through pseudomagnetic-field detection. This work establishes a compact approach to precision magnetometry and provides a basis for future searches for exotic interactions.