Levitated Milligram-scale Ferromagnetic Magnetometer at Room Temperature
- URL: http://arxiv.org/abs/2608.08544v1
- Date: Sun, 09 Aug 2026 07:44:54 GMT
- Title: Levitated Milligram-scale Ferromagnetic Magnetometer at Room Temperature
- Abstract summary: We demonstrate a milligram-scale diamagnetically levitated ferromagnet system operating at room temperature.<n>We achieve a magnetic sensitivity of 23fT$/sqrttextHz$ at frequency of 100-Hz level.<n>This platform establishes a high-performance magnetometer for biomagnetic field detection and beyond-standard-model force searches.
- Score: 4.525710968701301
- License: http://creativecommons.org/licenses/by/4.0/
- Abstract: Levitated mechanical oscillators are emerging ultrasensitive sensors with tremendous potential in both applied and fundamental physics. Levitated ferromagnets, with internal spin noises rapidly averaged, promise ultrahigh magnetic sensitivity. Here, we demonstrate a milligram-scale diamagnetically levitated ferromagnet system operating at room temperature. Through optimized geometry and multi-channel dissipation control, we achieve a magnetic sensitivity of 23~fT$/\sqrt{\text{Hz}}$ at frequency of 100-Hz level. We anticipate that a ferromagnetic magnetometer with subfemtotesla sensitivity is within reach, after modest technical improvements. This platform establishes a high-performance magnetometer for biomagnetic field detection and beyond-standard-model force searches.
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