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Investigation of Unwanted Oscillations of Electrically Modulated Magnetoelectric Cantilever Sensors

Authors :
Julius Schmalz
Elizaveta Spetzler
Jeffrey McCord
Martina Gerken
Source :
Sensors, Vol 23, Iss 11, p 5012 (2023)
Publication Year :
2023
Publisher :
MDPI AG, 2023.

Abstract

Magnetoelectric thin-film cantilevers consisting of strain-coupled magnetostrictive and piezoelectric layers are promising candidates for magnetic field measurements in biomedical applications. In this study, we investigate magnetoelectric cantilevers that are electrically excited and operated in a special mechanical mode with resonance frequencies above 500 kHz. In this particular mode, the cantilever bends in the short axis, forming a distinctive U-shape and exhibiting high-quality factors and a promising limit of detection of 70pT/Hz1/2 at 10 Hz. Despite this U mode, the sensors show a superimposed mechanical oscillation along the long axis. The induced local mechanical strain in the magnetostrictive layer results in magnetic domain activity. Due to this, the mechanical oscillation may cause additional magnetic noise, deteriorating the limit of detection of such sensors. We compare finite element method simulations with measurements of magnetoelectric cantilevers in order to understand the presence of oscillations. From this, we identify strategies for eliminating the external effects that affect sensor operation. Furthermore, we investigate the influence of different design parameters, in particular the cantilever length, material parameters and the type of clamping, on the amplitude of the undesired superimposed oscillations. We propose design guidelines to minimize the unwanted oscillations.

Details

Language :
English
ISSN :
14248220
Volume :
23
Issue :
11
Database :
Directory of Open Access Journals
Journal :
Sensors
Publication Type :
Academic Journal
Accession number :
edsdoj.86f3549f4094a2999473cc309ed9236
Document Type :
article
Full Text :
https://doi.org/10.3390/s23115012