Magnetoelectric intrinsic gradiometer with high detection sensitivity and ambient noise rejection

Mingji Zhang, Siu Wing Or, Yiu Man Yip

Research output: Chapter in book / Conference proceedingConference article published in proceeding or bookAcademic researchpeer-review


We report theoretically and experimentally the simultaneous realization of high detection sensitivity and high ambient noise rejection in an intrinsic gradiometer based on the giant magnetoelectric effect and the magnetic field gradient sensing technique in two specifically designed and arranged magnetoelectric magnetometers. The output voltage of the gradiometer is directly obtained from the intrinsic difference voltage between the two magnetoelectric magnetometers and is calibrated magnetic field gradient to give a high detection sensitivity of 3.2 mV/(Oe/m) and a high ambient noise rejection of 30 dB (equivalent to a noise level of 20 pT/√Hz at the natural resonance frequency of 120 kHz). The consistent characteristics of the magnetoelectric magnetometers result in almost zero non-linearity between the gradiometer output voltage and its magnetic field gradient over a broad range of frequency from 1 Hz to 170 kHz.
Original languageEnglish
Title of host publicationIEEE Sensors, SENSORS 2016 - Proceedings
ISBN (Electronic)9781479982875
Publication statusPublished - 5 Jan 2017
Event15th IEEE Sensors Conference, SENSORS 2016 - Convention Center at the Caribe Royale Hotel, Orlando, United States
Duration: 30 Oct 20162 Nov 2016


Conference15th IEEE Sensors Conference, SENSORS 2016
Country/TerritoryUnited States


  • ambient noise rejection
  • intrinsic gradiometer
  • magnetic field gradient
  • magnetoelectric effect
  • magnetometer

ASJC Scopus subject areas

  • Electrical and Electronic Engineering


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