AFF775 low noise magnetic field sensors from Sensitec are based on the AMR (anisotropic magnetoresistive) effect and feature a Wheatstone bridge. It also includes an integrated flip coil for offset correction.
AFF775 magnetic field sensors are ideal for detecting weak magnetic fields, including the Earth’s.

Features and Benefits
Extreme sensitivity
Wide magnetic field strength range
Low power consumption
Low flip coil resistance
Good signal to noise ratio