Hysteresis Reduction in Tunneling Magnetoresistive Sensor With AC Modulation Magnetic Field

A simple and practical ac modulation method to reduce the hysteresis in tunneling magnetoresistive (TMR) sensor is demonstrated. It is shown that with a suitable ac modulation magnetic field that is applied along the sensing direction of the TMR sensor, the hysteresis in the sensor can be reduced to...

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Bibliographic Details
Published in:IEEE transactions on magnetics 2021-02, Vol.57 (2), p.1-4
Main Authors: Liao, Shu-Hsien, Huang, Han-Sheng, Sokolov, Andrei, Yang, Yi, Liu, Yen-Fu, Yin, Xiaolu, Wilson, Amy, Trujillo, Joshua, Ewing, Dan, Liou, Sy-Hwang
Format: Article
Language:English
Subjects:
AC modulation
dynamic range
Hysteresis
hysteresis reduction
Magnetic field measurement
Magnetic fields
Magnetic hysteresis
magnetic tunnel junction (MTJ)
Magnetic tunneling
Magnetism
Magnetoresistivity
Modulation
Sensors
Tunneling magnetoresistance
tunneling magnetoresistive (TMR) sensor
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Summary:A simple and practical ac modulation method to reduce the hysteresis in tunneling magnetoresistive (TMR) sensor is demonstrated. It is shown that with a suitable ac modulation magnetic field that is applied along the sensing direction of the TMR sensor, the hysteresis in the sensor can be reduced to a negligible level. Also, depending on the amplitude of the modulation field, the sensitivity and the dynamic range of the TMR sensor can be tuned to meet practical requirements in specific applications. The influence of the modulation on the noise of TMR sensor is also studied.
ISSN:0018-9464
1941-0069
DOI:10.1109/TMAG.2020.3009900