Enhanced Sensitivity and Reduced Noise Floor in Magnetoelectric Laminate Sensors by an Improved Lamination Process

• Published in: Journal of the American Ceramic Society Vol. 94; no. 11; pp. 3738 - 3741
• Main Authors: Li, Menghui, Berry, David, Das, Jaydip, Gray, David, Li, Jiefang, Viehland, Dwight
• Format: Journal Article
• Language: English
• Published: Columbus Blackwell Publishing Ltd 01.11.2011; Wiley Subscription Services, Inc
• Subjects: Ceramics; Epoxy adhesives; Equivalence; Joining; Laminates; Magnetic fields; Magnetostriction; Noise; Phases; Piezoelectricity; Sensors
• ISSN: 0002-7820; 1551-2916
• DOI: 10.1111/j.1551-2916.2011.04659.x

The effect of lamination process on the performance of Metglas/Pb(Zr,Ti)O3‐based composite magnetoelectric (ME) sensors has been studied. Improved sensor processing can lead to higher coupling between the magnetostrictive and piezoelectric phases. A higher coupling factor results in higher magnetic field sensitivity and lower equivalent magnetic noise floors. Spin‐coat/vacuum‐bag application and cure of interfacial epoxy, in addition to the use of Metglas foils with enhanced magnetostriction (λ = 42 ppm), has led to an increase in the ME coefficient from 6 to 21.6 V/cm·Oe, and a decrease in the 1 Hz equivalent magnetic noise from 2 × 10−10 to 4 × 10−11 T/√Hz.