In-situ Instrumental Setup for Influence Study of Hard-axis Bias   Magnetic Field on MR transfer curves of sing MTJ sensor and MTJs array sensor
  Establishment of home-made measurement setups for the characterization of MR sensor is proposed and described here. The MR loops of MR sensors can be obtained with the instrument using two-point probe measurement and four-point probe measurement. Two pairs of Helmholtz coils can supply a hard-axis magnetic field and a soft-axis magnetic field for the sensor. The single MTJ sensor and MTJs array sensor in Wheatstone bridge were characterized and compared here. The influence of hard-bias magnetic field on MR transfer curves of sing MTJ sensor and MTJs array sensor are investigated. The corresponding optimal hard-axis magnetic fields were obtained through Helmholtz coils to eliminate the hysteresis for linear response of single MTJ sensor and MTJs array sensor. 
L. Li, Y. Zhou, W.W. Wang, P. W. T. Pong
cond-mat.mes-hall physics.bio-ph