Ultrasensitive Magnetoelectric Sensing Systemfor pico-Tesla MagnetoMyoGraphy

Siming Zuo, Julius Schmalz, Mesut-Omur Ozden , Mesut-Ömür Özden, Martina Gerken, Jingxiang Su, Florian Niekiel, Fabian Lofink, Kianoush Nazarpour, Hadi Heidari

Research output: Contribution to journalArticlepeer-review

Abstract

MagnetoMyoGraphy (MMG) with superconducting quantum interference devices (SQUIDs) enabled the measurement of very weak magnetic fields (femto to pico Tesla) generated from the human skeletal muscles during contraction. However, SQUIDs are bulky, costly and require working in a temperature-controlled environment, limiting wide-spread clinical use. We introduce a low-profile magnetoelectric (ME) sensor with analog frontend circuitry that has sensitivity to measure pico-Tesla MMG signals at room temperature. It comprises magnetostrictive and piezoelectric materials, FeCoSiB/AlN. Accurate device modelling and simulation are presented to predict device fabrication process comprehensively using the finite element method (FEM) in COMSOL Multiphysics®. The fabricated ME chip with its readout circuit was characterized under a dynamic geomagnetic field cancellation technique. The ME sensor experiment validate a very linear response with high sensitivities of up to 378 V/T driven at a resonance frequency of fres = 7.76 kHz. Measurements show the sensor limit of detections of down to 175 pT/Hz at resonance, which is in the range of MMG signals. Such a small-scale sensor has the potential to monitor chronic movement disorders and improve the end-user acceptance of human-machine interfaces.
Original languageEnglish
Pages (from-to)971 - 984
Number of pages14
JournalIEEE Transactions on Biomedical Circuits and Systems
Volume14
Issue number5
Early online date28 May 2020
DOIs
Publication statusPublished - 1 Oct 2020

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