A resonance-bending mode magnetoelectric-coupling equivalent circuit

Articles you may be interested inThe effects of interface misfit strain and surface tension on magnetoelectric effects in layered magnetostrictivepiezoelectric composites J. Appl. Phys. 114, 044109 (2013) In this paper, we discuss a theoretical model with experimental verification for the resonance enhancement of magnetoelectric (ME) interactions at frequencies corresponding to bending-tension oscillations. A dynamic theory of arbitrary laminated magneto-elasto-electric bars was constructed. The model included bending and longitudinal vibration effects for predicting ME coefficients in laminate bar composite structures consisting of magnetostrictive, piezoelectric, and pure elastic layers. The thickness dependence of stress, strain, and magnetic and electric fields within a sample are taken into account, as such the bending deformations should be considered in an applied magnetic or electric field. The frequency dependence of the ME voltage coefficients has obtained by solving electrostatic, magnetostatic, and elastodynamic equations. We consider boundary conditions corresponding to free vibrations at both ends. As a demonstration, our theory for multilayer ME composites was then applied to ferromagnetic-ferroelectric bilayers, specifically Metglas-PZT ones. A theoretical model is presented for static (low-frequency) ME effects in such bilayers. We also performed experiments for these Metglas-PZT bilayers and analyzed the influence of Metglas geometry (length and thickness) and Metglas/PZT volume fraction on the ME coefficient. The frequency dependence of the ME coefficient is also presented for different geometries (length, thickness) of Metglas. The theory shows good agreement with experimental data, even near the resonance frequency. V C 2012 American Institute of Physics.[http://dx

mentioning

confidence: 99%

Theoretical and experimental investigation of magnetoelectric effect for bending-tension coupled modes in magnetostrictive-piezoelectric layered composites

Hasanyan

Gao

Wang

et al. 2012

“…18,19 Our analysis of ME coupling is based on the fact that the net induced stress in a rigidly clamped cantilever of piezomagnetic and piezoelectric layers is nonuniform along the sample length. This is due to nonuniform distribution of stress originating from flexural deformation.…”

Section: Resultsmentioning

confidence: 99%

Magneto-electric interactions at bending resonance in an asymmetric multiferroic composite: Theory and experiment on the influence of electrode position

Sreenivasulu

Петров

et al. 2015

In magnetostrictive-piezoelectric bilayers the strength of mechanical strain mediated magneto-electric (ME) interactions shows a resonance enhancement at bending modes. Such composites when operating under frequency modulation at bending resonance have very high ME sensitivity and are of importance for ultrasensitive magnetometers. This report provides an avenue for further enhancement in the ME sensitivity by strategic positioning of the electrodes in the bilayer. We discuss the theory and measurements on the dependence of ME coupling on the position of electrodes in a lead zirconate titanate-permendur bilayer. Samples of effective length L with full electrodes and partial electrodes of length l ¼ L/3 are studied. A five-fold increase in ME voltage coefficient (MEVC) at bending resonance and a 75% increase in low-frequency MEVC are measured as the partial electrode position is moved from the free-end to clamped-end of the bilayer. When the partial electrode is close to the clamped end, the low-frequency and resonance MEVC are 22% and 45% higher, respectively, than for fully electroded bilayer. According to the model discussed here these observations could be attributed to non-uniform stress along the sample length under flexural deformation. Such deformations are stronger at the free-end than at the clamped-end, thereby reducing the stress produced by applied magnetic fields and a reduction in MEVC. Estimates of MEVC are in good agreement with the data. V C 2015 AIP Publishing LLC. [http://dx.

“…Whereas, the MME response of the MME composite cantilever in resonant status only have possible numerical solution and is roughly Q m times that in lowfrequency off-resonant range, where Q m is the mechanical quality factor of the piezoelectric phase. 22,25,26 …”

Section: Mme Equivalent Circuit Analysismentioning

confidence: 99%

A magneto-mechano-electric coupling equivalent circuit of piezoelectric bimorph/magnets composite cantilever

Liu

Dong

2014

Articles you may be interested inShear strain mediated magneto-electric effects in composites of piezoelectric lanthanum gallium silicate or tantalate and ferromagnetic alloys Appl. Phys. Lett. 105, 032409 (2014); 10.1063/1.4891536 Theoretical analysis on low frequency magneto-mechano-electric coupling behavior in piezo-unimorph/magnet composite J.Energy harvesting from ambient low-frequency magnetic field using magneto-mechano-electric composite cantilever Appl. Phys. Lett.In this study, a magneto-mechano-electric (MME) composite cantilever made of a piezoelectric bimorph and magnets for low-frequency magnetoelectric (ME) coupling was analyzed theoretically and its MME coupling equivalent circuit was developed. Based on equivalent circuit analyses, the dependences of the ME performances, i.e., the ME voltage and charge coefficients, upon the material constants and geometrical parameters of the MME composite cantilever are numerically evaluated. The obtained ME equivalent circuit model provides a theoretical basis to understand and improve the performance of the MME composite cantilever for low-frequency ME coupling. V C 2014 AIP Publishing LLC. [http://dx.