Hysteresis Reduction in Tunneling Magnetoresistive Sensor with AC Modulation Magnetic Field

Shu Hsien Liao, Han Sheng Huang, Andrei Sokolov, Yi Yang, Yen Fu Liu, Xiaolu Yin, Amy Wilson, Joshua Trujillo, Dan Ewing, Sy Hwang Liou

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Original languageEnglish (US)
Article number9143198
JournalIEEE Transactions on Magnetics
Volume57
Issue number2
DOIs
StatePublished - Feb 2021

Keywords

  • AC modulation
  • dynamic range
  • hysteresis reduction
  • magnetic tunnel junction (MTJ)
  • tunneling magnetoresistive (TMR) sensor

ASJC Scopus subject areas

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

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