High current sensitivity and large magnetoelectric effect in magnetostrictive-piezoelectric concentric ring

Chung Ming Leung, Siu Wing Or, Siu Lau Ho

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A magnetostrictive-piezoelectric concentric ring (MPCR) is fabricated, and its current sensitivity and magnetoelectric effect are studied theoretically and experimentally. The MPCR has an inner Tb0.3Dy0.7Fe1.92/NdFeB/epoxy magnetostrictive composite ring with a circumferential magnetization and an internal magnetic biasing bonded concentrically to an outer Pb(Zr, Ti)O3piezoelectric ceramic ring with a wall-thickness polarization. The current sensing in the MPCR is based on the direct coupling of vortex magnetic fields generated by current-carrying cables with the magnetoelectric effect in the MPCR structure. The MPCR shows high and linear current sensitivities and magnetoelectric voltage coefficients of 15-17 mV/A and 22-26 mV/Oe in the nonresonance frequency range of 1 Hz-50 kHz, and of 185 mV/A and 277 mV/Oe at the fundamental shape resonance of 96 kHz, for current and vortex magnetic field levels of up to 10 A and 6.7 Oe, respectively.
Original languageEnglish
Article number17A933
JournalJournal of Applied Physics
Issue number17
Publication statusPublished - 7 May 2014

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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