Levitated systems, characterized by weak environmental coupling, have emerged as a prominent research focus in precision measurement due to their significant advantages. Our team has successfully developed a novel magnetically levitated ferromagnetic resonator sensor, achieving a sensitivity of 20 fT/√Hz at an extremely small scale (20 μm). This sensitivity is comparable to state-of-the-art SQUID sensors and atomic magnetometers but operates at a drastically reduced scale, offering superior spatial resolution and integration potential.

This magnetometer demonstrates immense potential in both fundamental research and practical applications. In fundamental physics, it can be employed to detect weak signals such as dark matter and gravitational waves. In applied fields, it enables precise measurements of material magnetism and biomagnetic signals, providing a powerful tool for materials science and life sciences. With further optimization, this sensor is expected to play a crucial role in high-precision measurement scenarios.