DC magnetic field sensor based on electric driving and magnetic tuning in piezoelectric/magnetostrictive bilayer

Long Zhang, Siu Wing Or, Chung Ming Leung, Siu Lau Ho

Research output: Journal article publicationJournal articleAcademic researchpeer-review

4 Citations (Scopus)

Abstract

A dc magnetic field sensor possessing an interestingly high electric voltage-driven, magnetic field-tuned dc magnetoelectric (ME) effect is developed based on a bilayer of Pb(Zr, Ti)O3piezoelectric transformer and Tb0.3Dy0.7Fe1.92magnetostrictive substrate. The dc ME effect in the sensor, as evaluated experimentally and theoretically, is induced by driving the bilayer at its zero-field longitudinal resonance frequency (fr0) using an ac electric voltage (Vac) referenced at the input of the piezoelectric transformer, as well as, by tuning the field-dependent compliance and resonance characteristics of the bilayer with the dc magnetic field to be measured (Hdc) upon the negative-ΔE effect intrinsic in the magnetostrictive substrate. The sensor shows a good linear negative response of ac ME voltage (VME) at the output of the piezoelectric transformer to a broad range of Hdc of 0-350 Oe under a small Vac of 2.5 V peak at the designated fr0 of 125.3 kHz. This gives a high negative dc magnetic field sensitivity (S) of -1.58 mV/Oe.
Original languageEnglish
Article number17E520
JournalJournal of Applied Physics
Volume115
Issue number17
DOIs
Publication statusPublished - 7 May 2014

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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