A Study of Hysteresis Reduction of Small AC Magnetic Field Modulated Tunneling Magnetoresistive Sensor

In this study, a hysteresis reduction technique for tunneling magnetoresistive (TMR) sensor for low magnetic field sensing is proposed, where a small ac modulation magnetic field is applied. The magnetic tunnel junctions (MTJs) were connected into an asymmetric Wheatstone bridge to form a sensor, an...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2022-02, Vol.58 (2), p.1-4
Main Authors: Huang, Han-Sheng, Liao, Shu-Hsien, Yang, Yi, Sokolov, Andrei, Liu, Yen-Fu, Yin, Xiaolu, Viera, Lucas Camponogara, Liou, Sy-Hwang
Format: Article
Language:English
Subjects:
AC modulation
Frequency response
Hysteresis
hysteresis reduction
linear response
low-field detection
Magnetic field measurement
Magnetic fields
Magnetic hysteresis
Magnetic separation
magnetic tunnel junction (MTJ)
Magnetic tunneling
Magnetism
Magnetoresistivity
Modulation
Reduction
Sensors
Tunnel junctions
Tunneling magnetoresistance
tunneling magnetoresistive (TMR) sensor
Wheatstone bridges
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Summary:In this study, a hysteresis reduction technique for tunneling magnetoresistive (TMR) sensor for low magnetic field sensing is proposed, where a small ac modulation magnetic field is applied. The magnetic tunnel junctions (MTJs) were connected into an asymmetric Wheatstone bridge to form a sensor, and the output voltage of the TMR sensor was measured using a small ac modulation field and test field along the sensor's sensing direction. The results showed that hysteresis in the TMR sensor can be effectively reduced to exhibit a linear response. Further, the frequency response of the TMR sensor was studied. Finally, the feasibility of the TMR sensor for low-field detection with small ac modulation was demonstrated.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2021.3085095