SUPPRESSING IMPACTS OF DOMAIN HOPPINGS FOR MAGNETORESISTIVE SENSORS

Mengchun Pan - Jiafei Hu - Dixiang Chen - Wugang Tian - Jianqiang Zhao - Guiyun Tian

   Domain hoppings result in magnetic hysteresis and 1/f resistance noise for MR sensors, which degrade response linearity and lowfrequency detection ability of MR sensors. In this paper, the solution of vertical motion flux modulation with constant magnetic excitation has been proposed. The response linearity of the prototype sensors is improved from 0.8% to 0.12%. The noise level is reduced near to the thermal noise level, and the low-frequency detection ability of the prototype sensor is enhanced with a factor of ~ 83.

Keywords: domain hopping, 1/f resistance noise, magnetic hysteresis, vertical motion flux modulation, compensation field

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