The challenge of magnetometers for bio-magnetic measurement is simultaneously achieving low noise, low power consumption, and making them compact in size
Low-noise, wide-band magnetometers are required in a wide range of fields, including for biomagnetism for magnetoencephalography and magnetomyography, autonomous driving, non-destructive inspection, and current sensing. The size must be on the order of several millimeters due to restrictions on the amount of space in which it can be placed, and making them compact in size and reducing their weight are particularly necessary for implantable bio-magnetic measurements.
Up to now, small and wide-band magnetometers have tended to increase magnetic noise, and low-noise ones have tended to increase in size and driving current. For applications such as bio-magnetic measurement, the challenge is to achieve low noise, low power consumption, and compact size simultaneously.