Magnetic flux modulation with a piezoelectric silicon bridge for 1/f noise reduction in magnetoresistive sensors

Magnetoresistive sensors have plenty of applications in magnetic sensing areas, but magnetic and nonmagnetic 1/f noise severely degrades their low-frequency performances, especially detection sensitivity with hundreds of loss. In this paper, vertical motion flux modulation scheme with a piezoelectri...

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Bibliographic Details
Main Authors: Jiafei Hu, Wugang Tian, Hongfeng Pang, Jianqiang Zhao, Wenyin Li, Dixiang Chen, Mengchun Pan
Format: Conference Proceeding
Language:English
Subjects:
Bridge circuits
Magnetic flux
Magnetic sensors
Modulation
Prototypes
Silicon
Online Access:Request full text
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Summary:Magnetoresistive sensors have plenty of applications in magnetic sensing areas, but magnetic and nonmagnetic 1/f noise severely degrades their low-frequency performances, especially detection sensitivity with hundreds of loss. In this paper, vertical motion flux modulation scheme with a piezoelectric silicon bridge is recommended for 1/f noise reduction, due to its effectiveness, simplicity and stability as well as moderate modulation efficiency. In our prototype sensor, the detection sensitivity was greatly improved to ~80 pT /√Hz at 1 Hz, which was near 300 times upgraded, when the detected magnetic field was transferred up to the resonance frequency of the piezoelectric silicon bridge.
ISSN:1930-0395
2168-9229
DOI:10.1109/ICSENS.2013.6688288