Special Issue "Advances in Magnetoelectric Composites"

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Advanced Composites".

Deadline for manuscript submissions: 30 June 2020.

Special Issue Editors

Dr. Miguel Algueró
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Guest Editor
Instituto de Ciencia de Materiales de Madrid (ICMM), CSIC, Spain
Interests: multiferroic and ferroelectric materials for information technologies, covering all single-phase and composites, ceramics and thin films, processing and properties; mechanosynthesis, sol–gel, templated grain growth, spark plasma sintering, of electrical, mechanical, electromechanical and magnetoelectric properties, nanostructuring and size effects in the nanoscale
Prof. Liliana Mitoseriu
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Guest Editor
University Alexandru Ioan Cuza from Iasi, Faculty of Physics, Romania
Interests: dielectrics; ferroelectrics and multiferroic oxide ceramics; single-phase and multi-phase composites: processing and functional properties; grain size and grain boundary driven properties; BaTiO3-based solid solutions; multiscale modeling of electric and magnetic properties
Dr. Harvey Amorín
Website
Guest Editor
Instituto de Ciencia de Materiales de Madrid (ICMM), CSIC, Spain
Interests: advanced processing and properties of knowledge-based materials: multiferroics, magnetoelectrics, ferroelectrics, piezoelectrics; single-phase perovskite oxides, new solid solutions, and morphotropic phase boundary (MPB); composites including all-oxide materials, metal alloy-oxide, and polymer-oxides; material nanostructuring and size effects, mechanosynthesis, and spark plasma sintering; sensors, actuators, and energy harvesting

Special Issue Information

Dear Colleague,

Magnetoelectrics are key enabling materials for a range of proposed related technologies that exploit their ability to develop an electric polarization in response to a magnetic field, and conversely of a magnetization in response to an electric one. Examples are electrically-tunable magnetic devices for microwave communications, high-sensitivity magnetic-field sensors with room-temperature operation, and energy harvesters, to name a few. The most promising materials and those closest to enabling the technologies are two-phase materials combining ferroelectrics and ferromagnets. The largest effective room-temperature magnetoelectric coefficients have been obtained for composites of elastically-coupled high-sensitivity piezoelectric and magnetostrictive components. Different piezoresponsive phases and connectivity schemes are under consideration, but mostly ferroelectric oxides and polymers have been used as piezoelectrics, while magnetic metal alloys and oxides are the choice for magnetostrictive components. All 0–3, 1–3, and 2–2 composite configurations are being extensively explored for different applications, and good quality particulate, fiber-type, and laminate composites have been reported. This Special Issue aims at putting together recent advancements in processing, understanding, applications, and novel materials, and finally aims to outline some future technological and scientific challenges in the field of magnetoelectric composites. Contributions on all types of composites, both bulk and film, either experimental or theoretical studies as well as potential technical implementations are welcomed.

Dr. Miguel Algueró
Prof. Liliana Mitoseriu
Dr. Harvey Amorín
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Materials is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 2000 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • ceramic technologies
  • thin film technologies
  • polymer technologies
  • microstructural design
  • interface phenomena
  • advanced processing
  • property characterization
  • device demonstration
  • ferroics and multiferroics
  • piezoelectrics and magnetostrictive materials

Published Papers (5 papers)

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Research

Open AccessArticle
Spin Coating and Micro-Patterning Optimization of Composite Thin Films Based on PVDF
Materials 2020, 13(6), 1342; https://doi.org/10.3390/ma13061342 - 16 Mar 2020
Abstract
We optimize the elaboration of very thin film of poly(vinylidene fluoride) (PVDF) polymer presenting a well-controlled thickness, roughness, and nano-inclusions amount. We focused our effort on the spin coating elaboration technique which is easy to transfer to an industrial process. We show that [...] Read more.
We optimize the elaboration of very thin film of poly(vinylidene fluoride) (PVDF) polymer presenting a well-controlled thickness, roughness, and nano-inclusions amount. We focused our effort on the spin coating elaboration technique which is easy to transfer to an industrial process. We show that it is possible to obtain continuous and smooth thin films with mean thicknesses of 90 nm by properly adjusting the concentration and the viscosity of the PVDF solution as well as the spin rate and the substrate temperature of the elaboration process. The electro-active phase content versus the magnetic and structural properties of the composite films is reported and fully discussed. Last but not least, micro-patterning optical lithography combined with plasma etching has been used to obtain well-defined one-dimensional micro-stripes as well as squared-rings, demonstrating the easy-to-transfer silicon technology to polymer-based devices. Full article
(This article belongs to the Special Issue Advances in Magnetoelectric Composites)
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Open AccessArticle
Direct Magnetoelectric Effect in a Sandwich Structure of PZT and Magnetostrictive Amorphous Microwires
Materials 2020, 13(4), 916; https://doi.org/10.3390/ma13040916 - 19 Feb 2020
Abstract
The magnetoelectric (ME) response in a trilayer structure consisting of magnetostrictive Fe77.5B15Si17.5 amorphous microwires between two piezoelectric PZT (PbZr0.53Ti0.47O3) layers was investigated. Soft magnetic properties of wires make it possible to operate [...] Read more.
The magnetoelectric (ME) response in a trilayer structure consisting of magnetostrictive Fe77.5B15Si17.5 amorphous microwires between two piezoelectric PZT (PbZr0.53Ti0.47O3) layers was investigated. Soft magnetic properties of wires make it possible to operate under weak bias magnetic fields below 400 A/m. Enhanced ME voltage coefficients were found when the microwires were excited by ac magnetic field of a frequency of 50–60 kHz, which corresponded to the frequency of electromechanical resonance. The as-prepared microwires were in a glass coat creating a large thermoelastic stress and forming a uniaxial magnetic anisotropy. The effect of glass-coat removal and wire annealing on ME coupling was investigated. The glass coat not only affects the wire magnetic structure but also prevents the interfacial bonding between the electric and magnetic subsystems. However, after its removal, the ME coefficient increased slightly less than 10%. Refining the micromagnetic structure and increasing the magnetostriction by stress release during wire annealing (before or after glass removal) strongly increases the ME response up to 100 mV/(cm × Oe) and reduces the characteristic DC magnetic field down to 240 A/m. Although the achieved ME coefficient is smaller than reported values for multilayered films with layers of PZT and soft magnetic alloys as Metglass, the proposed system is promising considering a small volume proportion of microwires. Full article
(This article belongs to the Special Issue Advances in Magnetoelectric Composites)
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Open AccessArticle
Selection and Optimization of a K0.5Na0.5NbO3-Based Material for Environmentally-Friendly Magnetoelectric Composites
Materials 2020, 13(3), 731; https://doi.org/10.3390/ma13030731 - 05 Feb 2020
Abstract
Li- and Ta-modified K0.5Na0.5NbO3 compounds are among the most promising lead-free ferroelectrics for high-sensitivity piezoelectric ceramic materials, and are potentially capable of replacing Pb(Zr,Ti)O3. They are also being investigated as piezoelectric components in environmentally friendly magnetoelectric [...] Read more.
Li- and Ta-modified K 0.5 Na 0.5 NbO 3 compounds are among the most promising lead-free ferroelectrics for high-sensitivity piezoelectric ceramic materials, and are potentially capable of replacing Pb(Zr,Ti)O 3 . They are also being investigated as piezoelectric components in environmentally friendly magnetoelectric composites. However, most suitable modifications for this application have not been identified. We report here a simulation study of how the magnetoelectric voltage responses of layered composite structures based on Li x (K 0.5 Na 0.5 ) 1 x Nb 1 y Ta y O 3 varies with the chemical composition of the piezoelectric. Instead of relying on material coefficients from the literature, which would have required using different sources, an ad hoc set of materials was prepared. This demanded tailoring preparation by conventional means to obtain dense ceramics while controlling alkali volatilization, perovskite phase and microstructure, as well as characterizing their dielectric, elastic and electromechanical properties. This provided the set of relevant material coefficients as a function of composition, which was used to obtain the magnetoelectric responses of model layered structures including a reference magnetostrictive spinel oxide by simulation. The piezoelectric material leading to the highest magnetoelectric coefficient was identified, and shown to be different to that showing the highest piezoelectric coefficient. This reflects the dependence of the magnetoelectric response on all material coefficients, along with the complex interplay between composition, processing and properties in K 0.5 Na 0.5 NbO 3 -based ceramics. Full article
(This article belongs to the Special Issue Advances in Magnetoelectric Composites)
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Open AccessArticle
Enhanced Magnetoelectric Coupling in BaTiO3-BiFeO3 Multilayers—An Interface Effect
Materials 2020, 13(1), 197; https://doi.org/10.3390/ma13010197 - 02 Jan 2020
Cited by 1
Abstract
Combining various (multi-)ferroic materials into heterostructures is a promising route to enhance their inherent properties, such as the magnetoelectric coupling in BiFeO3 thin films. We have previously reported on the up-to-tenfold increase of the magnetoelectric voltage coefficient αME in BaTiO3 [...] Read more.
Combining various (multi-)ferroic materials into heterostructures is a promising route to enhance their inherent properties, such as the magnetoelectric coupling in BiFeO3 thin films. We have previously reported on the up-to-tenfold increase of the magnetoelectric voltage coefficient α ME in BaTiO3-BiFeO3 multilayers relative to BiFeO3 single layers. Unraveling the origin and mechanism of this enhanced effect is a prerequisite to designing new materials for the application of magnetoelectric devices. By careful variations in the multilayer design we now present an evaluation of the influences of the BaTiO3-BiFeO3 thickness ratio, oxygen pressure during deposition, and double layer thickness. Our findings suggest an interface driven effect at the core of the magnetoelectric coupling effect in our multilayers superimposed on the inherent magnetoelectric coupling of BiFeO3 thin films, which leads to a giant α ME coefficient of 480 Vc m 1 Oe 1 for a 16 × (BaTiO3-BiFeO3) superlattice with a 4.8 nm double layer periodicity. Full article
(This article belongs to the Special Issue Advances in Magnetoelectric Composites)
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Open AccessArticle
Modeling of a Magnetoelectric Laminate Ring Using Generalized Hamilton’s Principle
Materials 2019, 12(9), 1442; https://doi.org/10.3390/ma12091442 - 03 May 2019
Cited by 1
Abstract
The mathematical modeling of the magnetoelectric (ME) effect in ME laminates has been established for some simple structures. However, these methods, which are based on the differential equation approach, are difficult to use in other complex structures (e.g., ring structures). In this work, [...] Read more.
The mathematical modeling of the magnetoelectric (ME) effect in ME laminates has been established for some simple structures. However, these methods, which are based on the differential equation approach, are difficult to use in other complex structures (e.g., ring structures). In this work, a new established approach based on the generalized Hamilton’s principle is used to analyze the ME effect in an ME laminated ring. Analytical expressions for ME voltage coefficients are derived. A comparison with the conventional method indicates that this approach is more convenient when the modeling analysis is performed on complex structures. Further, experimental data are also obtained to compare with the theoretical calculations in order to validate the new approach. Full article
(This article belongs to the Special Issue Advances in Magnetoelectric Composites)
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Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Planned Paper 1

Title: Towards full poling of the piezoelectric phase in  particulate  PZT-CoFe2O4 magnetoelectric composites

Authors: Pietro Galizia, Elisa Mercadelli, Carlo Baldisserri, Claudio Capiani, Mauro Mazzocchi, Carmen Galassi

Affiliation: Institute of Science and Technology for Ceramics (ISTEC), CNR, Faenza, Italy.

Planned Paper 2

Title: Magnetoelectric MEMS Double-Clamped Resonators for Magnetic Field Sensors

Author: Peter Finkel (@nrl.navy.mil)

Abstract: Magnetoelectric (ME) resonators are of significant interest for next generation magnetic field sensors, as the direct coupling of magnetostrictive and piezoelectric phases enables high magnetic field sensitivity with exceptionally low operational power requirements. In this work, we present silicon based ME thin film resonators with clamped-clamped boundary conditions, that are fully suspended to achieve a string mode resonance.  An applied magnetic field results in the development of a magnetoelastic stress that shifts the resonance frequency, which can be detected using the piezoelectric layer. In this work we will discuss possible ways to improve limit of detection of this type of sensors.

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