Measurement of the anisotropy fields for AMR sensors

Abstract

Crossfield effect of anisotropic magnetoresistive (AMR) sensors is an unwanted response to magnetic fields perpendicular to the sensitive axis. For example, the crossfield error of Honeywell HMC1002 sensors could reach 1100 nT in geomagnetic environment [1]. The cause of the effect is that crossfields could change the direction of magnetization in AMR film, which results in variation of magnetoresistance.