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

摘要

The effect of lamination process on the performance of Metglas/Pb(Zr,Ti)O_3-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~(1/2).