A study of hysteresis reduction of small ac magnetic field modulated tunneling magnetoresistive sensor

Han Sheng Huang, Shu Hsien Liao, Yi Yang, Andrei Sokolov, Yen Fu Liu, Xiaolu Yin, Lucas Camponogara Viera, Sy Hwang Liou

Research output: Contribution to journalArticlepeer-review

Abstract

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 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.

Original languageEnglish (US)
JournalIEEE Transactions on Magnetics
DOIs
StateAccepted/In press - 2021

Keywords

  • AC modulation
  • hysteresis reduction
  • linear response
  • low field detection
  • Magnetic field measurement
  • Magnetic hysteresis
  • Magnetic separation
  • magnetic tunnel junction (MTJ)
  • Magnetic tunneling
  • Modulation
  • Sensors
  • Tunneling magnetoresistance
  • tunneling magnetoresistive (TMR) sensor

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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