Resonance magnetoelectric effects in layered magnetostrictive-piezoelectric composites

Abstract

Magnetoelectric interactions in bilayers of magnetostrictive and piezoelectric phases are mediated by mechanical deformation. Here we discuss the theory and companion data for magnetoelectric (ME) coupling at electromechanical resonance (EMR) in a ferrite-lead zirconate titanate (PZT) bilayer. Estimated ME voltage coefficient versus frequency profiles for nickel, cobalt, or lithium ferrite and PZT reveal a giant ME effect at EMR with the highest coupling expected for cobalt ferrite-PZT. Measurements of resonance ME coupling have been carried out on layered and bulk composites of nickel ferrite-PZT. We observe a factor of 40-600 increase in ME voltage coefficient at EMR compared to low frequency values. Theoretical ME voltage coefficients versus frequency profiles are in excellent agreement with data. The resonance ME effect is therefore a novel tool for enhancing the field conversion efficiency in the composites.

Microwave magnetoelectric effects in single crystal bilayers of yttrium iron garnet and lead magnesium niobate-lead titanate

“…5 With further increase in frequency, a dramatic increase in α E is observed at electromechanical resonance (EMR) due to radial acoustic modes. 8 The EMR occurs at 100-400 kHz for disk shaped samples of diameter 25-10 mm. One anticipates a similar resonance in α E vs f at a higher frequency due to thickness modes in the samples.…”

Multiferroic nanocomposite fabrication via liquid phase using anodic alumina template

“…These nanocomposites have the potential for applications in a variety of multifunctional devices, such as data storage media, in which magnetization can be reversed by applying an electric field (or vice versa), and microwave frequency transducers where the magneto-electric coupling constant depends on the frequency of applied alternating magnetic field [2–5]. Although several attempts for fabricating bulk-type multiferroic nanocomposites, by ceramic sintering and hot molding for example, have been reported so far [6,7], much more studies on fabrication of film-type nanocomposites by sol-gel process [8,9] and pulsed laser deposition (PLD) [10–13] have been recently published.…”

Giant magnetoelectric effect in magnet-cymbal-solenoid current-to-voltage conversion device

“…3 By contrast, a much stronger ME effect in a wide range of temperature can be acquired in multiphase magnetostrictive-piezoelectric composites using product property. 4 Typical examples include bulk composites of ferrites and Pb͑Zr 1−x Ti x ͒O 3 ͑PZT͒ ceramics 5,6 and laminated composites of Tb 0.3 Dy 0.7 Fe 1.92 ͑terfenol-D͒ alloy and PZT ceramics or PbMg 1/3 Nb 2/3 O 3 -PbTiO 3 ͑PMN-PT͒ single crystals. [7][8][9][10][11] In fact, laminated composites have shown stronger ME effect and better property tailorability than the bulk composites.…”

“…1 The effect has attracted considerable research interest in recent years because of its unusual physics and potential applications. [2][3][4][5][6][7][8][9] In single-phase materials, the ME effect is an intrinsic coupling between the magnetic and electric dipoles at atomic level. 2 However, this intrinsic ME effect is generally weak and only obtainable at low temperatures.…”

“…[7][8][9][10][11] In fact, laminated composites have shown stronger ME effect and better property tailorability than the bulk composites. [5][6][7][8][9][10][11] Nevertheless, the ME effect in the composites is a result of the mechanically mediated magnetostrictive effect in the magnetostrictive phase and the piezoelectric effect in the piezoelectric phase. [4][5][6][7][8][9][10][11] The magnetostrictive and piezoelectric phases can be regarded as an actuation and a sensing means in the composites, respectively.…”