Fig. 4: Sensitivity statistics of different-sized magnetometers.

a Sensitivity spectra of different-sized magnetometers within the frequency range of 5 kHz–30 MHz. The microdisk radii are 105 μm, 155 μm, 205 μm, 305 μm, 355 μm, and 405 μm from top to bottom. The dips marked by orange triangles correspond to the RBMs, located at 20.02 MHz, 12.57 MHz, 9.34 MHz, 6.49 MHz, 5.77 MHz, and 5.20 MHz from top to bottom. The dips marked by blue stars correspond to the HOFMs, located at 23.73 MHz, 17.00 MHz, 11.21 MHz, 9.52 MHz, and 8.30 MHz from top to bottom. b Optimal sensitivity \({B}_{\min }\) of the RBMs (orange triangles) and HOFMs (blue stars), as a function of the microdisk radius