  Among several dark matter candidates, bosonic ultralight (sub meV) dark
matter is well motivated because it could couple to the Standard Model (SM) and
induce new forces. Previous MICROSCOPE and Eot Wash torsion experiments have
achieved high accuracy in the sub-1 Hz region, but at higher frequencies there
is still a lack of relevant experimental research. We propose an experimental
scheme based on the diamagnetic levitated micromechanical oscillator, one of
the most sensitive sensors for acceleration sensitivity below the kilohertz
scale. In order to improve the measurement range, we used the sensor whose
resonance frequency could be adjusted from 0.1Hz to 100Hz. The limits of the
coupling constant are improved by more than 10 times compared to previous
reports, and it may be possible to achieve higher accuracy by using the array
of sensors in the future.
