Magnetoelectric Sensors With Directly Integrated Charge Sensitive Readout Circuit—Improved Field Sensitivity and Signal-to-Noise Ratio

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.Index Terms-Flux concentration, magnetoelectric effect, Metglas/PVDF, multilayer, signal-to-noise ratio (SNR).

A novel magnetoelectric biomagnetic susceptometer on iron level detection with mice tissue in vitro

“…Here, a figure of merit (FOM) is introduced to compare different piezo‐materials. (Fang, Mokhariwale, Li, Datta, & Zhang, ; Lu et al., ). Generally speaking, relaxor ferroelectric single crystals show superior piezoelectric coefficients compared to their ceramic counterparts and excellent electromechanical coupling factors ( k > 90%), compared to PZT ceramics ( k ~ 70%) (Guo, Luo, He, & Yin, ; Luo, Xu, Xu, Wang, & Yin, ; Park & Shrout, ; Peng, Luo, He, Xu, & Lin, ).…”

“…Recently, the ternary single crystals PIN‐PMN‐PT have been reported, featuring broadened temperature usage range (>120°C), and high piezoelectric properties (Zhang et al., ). As shown in Table , the piezoelectric single crystal PIN‐PMN‐PT exhibits a larger d p and FOM and hence the SNR compared with PZT ceramics (Fang et al., ; Lu et al., ).…”

Non-invasive MR-guided HIFU Therapy of TSC-Associated Renal Angiomyolipomas

“…Parallel imaging will be optimized to improve imaging speed and minimize motion artifacts in free-breathing mice. Specifically, the optimization will be performed to improve four major imaging methods, T 1 …”

“…given f = f(x) and data for U ∼ = U D where β = O(1000) and κ = O (1). Both a theoretical analysis and computations with finite difference schemes has been done to show the veracity of the approach.…”

“…The difference in sizes for κ and β can lead to subtractive cancellation issues (due to data approximation errors (not floating point)) in the case when U and U are O(1) and f is O(β). To be more precise, our direct residual technique involves creating equations for the parameters by multiplying the DE by functions ω and integrating by parts over Ω = [0,1];…”