Quasi-one-dimensional miniature multiferroic magnetic field sensor with high sensitivity at zero bias field

Abstract

A miniature, quasi one dimensional, magnetic field sensor based on magnetoelectric coupling is presented. The magnetoelectric sensor makes use of the d31 coupling mode between a piezoelectric lead zirconate titanate tube and FeNi magnetostrictive wire. The sensors demonstrate high sensitivity, high signal-to-noise ratio, and low noise floor at zero DC magnetic bias field and at low frequency resulting in smaller, lower power consumption, and volumetric efficiency. Experiments indicate a zero bias field sensitivity of 16.5 mV/Oe at 100 Hz stemming from a magnetoelectric coefficient of 1.65 V/cm-Oe. The results are quantitatively described by a theoretical model of laminate composites.

Tunable fringe magnetic fields induced by converse magnetoelectric coupling in a FeGa/PMN-PT multiferroic heterostructure

“…A representative application includes magnetic field sensors. 8 However, under converse magnetoelectric (CME) coupling, an electric field is applied to the piezoelectric, inducing strain, which in turn strains the magnetostrictive element(s) inducing magnetization in the magnetostrictive element(s). Coupling between the piezoelectric and magnetostrictive elements depends on the connectivity scheme employed in the heterostructure, as well as the coupling coefficients of the distinct elements and their volume fractions.…”

Improved magnetoelectric effect in magnetostrictive/piezoelectric composite with flux concentration effect for sensitive magnetic sensor

“…[2][3][4] This strain-mediated ME coupling is quite strong at room temperature in such composites and has enormous potential for novel functional devices (such as sensors, transducers, and memory devices). [1][2][3][4][5][6] For obtaining a more sensitive magnetic sensor, the magnetostrictive phase in the laminate composite is recommended to have higher effective relative permeability µ r and lower saturation magnetization µ 0 M s . 7,8 But unfortunately, most of the magnetostrictive materials have low µ r .…”

“…7,8 But unfortunately, most of the magnetostrictive materials have low µ r . 9,10 Recently, the ME composites with Metglas have highest sensitivity and lowest noise for ME sensors. 11 In order to enhance the sensitivity for ME composite with Metglas, the amount of strain on the PZT plate should be larger which depends on the thickness ratios of the magnetostrictive ribbon and PZT layers.…”

High magnetoelectric tuning effect in a polymer-based magnetostrictive-piezoelectric laminate under resonance drive

“…This improved resonance ME tuning effect, together with the durable and tailorable natures, makes the laminate great promise for developing into tunable ME devices. 3 (PMN-PT) piezoelectric crystal have been a main focus because of their generally high extrinsic ME effect arisen from the mechanically mediated magnetostrictive and piezoelectric effects. 1,2 When operating at resonance, these alloy-crystal-based laminates often yield an enhanced resonance ME effect of $10 times higher in ME voltage coefficient (a V ) compared to their nonresonance a V counterparts.…”

“…2 Recently, ME tuning has become a physically interesting and technologically important topic for realizing tunable ME devices. [1][2][3][4] From the aspect of magnetically ME tuning, the highest tunable a V of $10 times (i.e., a V tunability of $1000%) and tunable resonance frequency (f r ) of $2 kHz range (i.e., f r tunability of $3%) in a magnetic bias field (H Bias ) range of 0.02-0.8 kOe have been observed in the Terfenol-D/PMN-PT laminates. 2 In this paper, we report a high H Bias -controllable nonlinear resonance ME tuning effect in a polymer-based ME laminate formed by a polyvinylidene fluoride (PVDF) piezoelectric polymer film and two epoxy-bonded Terfenol-D pseudo-1-3 magnetostrictive particulate composite plates.…”