Magnetoelectric sensors with directly integrated charge sensitive readout circuit-improved field sensitivity and signal-to-noise ratio

Zhao Fang, Ninad Mokhariwale, Feng Li, Suman Datta, Q. M. Zhang

    Research output: Contribution to journalArticlepeer-review

    11 Scopus citations

    Abstract

    The large magnetoelectric (ME) coupling in the ME laminates makes them attractive for ultrasensitive room temperature magnetic sensors. Here ,we investigate the field sensitivity and signal-to-noise ratio (SNR) of ME laminates, consisting of magnetostrictive and piezoelectric layers (Metglas and piezopolymer PVDF were used as the model system), which are directly integrated with a low noise readout circuit. Both the theoretical analysis and experimental results show that increasing the number of piezoelectric layers can improve the SNR, especially at low frequencies. We also introduce a figure of merit to measure the overall influence of the piezolayer properties on the SNR and show that the newly developed piezoelectric single crystals of PMN-PT and PZN-PT have the promise to achieve a very high SNR and consequently ultra-high sensitivity room temperature magnetic sensors. The results show that the ME coefficients used in early ME composites development works may not be relevant to the SNR. The results also show that enhancing the magnetostrictive coefficient, for example, by employing the flux concentration effect, can lead to enhanced SNR.

    Original languageEnglish (US)
    Article number5711634
    Pages (from-to)2260-2265
    Number of pages6
    JournalIEEE Sensors Journal
    Volume11
    Issue number10
    DOIs
    StatePublished - 2011

    All Science Journal Classification (ASJC) codes

    • Instrumentation
    • Electrical and Electronic Engineering

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