美国海军地面作战中心已发明了一种价廉、小型、适于大量生产的磁阻磁力仪。这种磁阻磁力仪由一小型芯片组成,芯片上有4个接头。在芯片上沉积一薄层坡莫合金,然后将芯片刻蚀,形成一“惠斯顿电桥”,每一桥臂都由一磁阻组成。另外,需要一块小型永久磁铁,使坡莫合金薄层沿一个方向磁化。由于被测磁场垂直于永久磁铁磁场,因此,当磁化强度改变时,会使磁阻发生变化。这样, The U.S. Naval Ground Operations Center has invented a magnetoresistive magnetometer that is cheap, small and suitable for mass production. This magnetoresistive magnetometer consists of a small chip, the chip has four connectors. A thin layer of permalloy is deposited on the chip and then the chip is etched to form a “Wheatstone bridge,” with each leg consisting of a magnetoresistive. In addition, a small permanent magnet is needed to magnetize the permalloy film in one direction. Since the measured magnetic field is perpendicular to the permanent magnet field, the reluctance will change as the magnetization changes. such,