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Special Issue "Physics, Measurements and Applications of Multiferroic and Magnetoelectric Materials"

A special issue of Materials (ISSN 1996-1944).

Deadline for manuscript submissions: 31 October 2017

Special Issue Editor

Guest Editor
Dr. Melvin M. Vopson

Faculty of Science, SEES - Applied Physics, University of Portsmouth, Portsmouth PO1 3QL, UK
Website1 | Website2 | E-Mail
Interests: fundamentals and applications of multiferroic materials; development of advanced measurements for materials testing; plasma sputtering of thin films; physics of ferroelectric and anti-ferroelectric materials; materials for novel digital data storage; magnetic materials and technologies; solid state cooling and multicaloric effects

Special Issue Information

Dear Colleagues,

Materials science is a key factor in driving technological development and economic growth. Since the silicon industrial revolution of the 1950s, research and developments in materials science have radically impacted and transformed our society by enabling the emergence of computer technologies, wireless communications, Internet, digital data storage technologies and widespread consumer electronics. Today’s emergent topics in materials science research, such as nano-materials, carbon based grapheme and nano-tubes, smart and multifunctional materials, spintronic materials, bio-materials and multiferroic materials, promise to deliver a new wave of technological advances and economic impact, comparable to the silicon industrial revolution of the 1950s.

In particular, the recent surge of interest in multiferroic materials has been driven by their fascinating physical properties, as well as their huge potential for technological applications. This Special Issue of “Physics, Measurements and Applications of Multiferroic and Magnetoelectric Materials” will be a one-stop resource to the solid-state multiferroics and magneto-electric materials communities, providing a collection of high quality reviews and articles covering all research aspects of multiferroic materials including measurements, applications and modelling.

Dr. Melvin M. Vopson
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 monthly 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 1500 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

  • Multiferroic materials
  • Magneto-electric effect
  • Measurement of magneto-electric coupling effects
  • Composite multiferroics
  • Single phase multiferroics
  • Synthesis of multiferroic materials
  • Structural properties of multiferroics
  • Microcopy and microstructure of multiferroic materials  
  • Modelling of multiferroic materials
  • Applications of multiferroic and magneto-electric materials  

Published Papers (5 papers)

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Research

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Open AccessFeature PaperArticle Temperature Dependence of the Resonant Magnetoelectric Effect in Layered Heterostructures
Materials 2017, 10(10), 1183; doi:10.3390/ma10101183
Received: 7 September 2017 / Revised: 6 October 2017 / Accepted: 7 October 2017 / Published: 16 October 2017
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Abstract
The dependence of the resonant direct magnetoelectric effect on temperature is studied experimentally in planar composite structures. Samples of rectangular shapes with dimensions of 5 mm × 20 mm employed ferromagnetic layers of either an amorphous (metallic glass) alloy or nickel with a
[...] Read more.
The dependence of the resonant direct magnetoelectric effect on temperature is studied experimentally in planar composite structures. Samples of rectangular shapes with dimensions of 5 mm × 20 mm employed ferromagnetic layers of either an amorphous (metallic glass) alloy or nickel with a thickness of 20–200 μm and piezoelectric layers of single crystalline langatate material or lead zirconate titanate piezoelectric ceramics with a thickness of 500 μm. The temperature of the samples was varied in a range between 120 and 390 K by blowing a gaseous nitrogen stream around them. It is shown that the effective characteristics of the magnetoelectric effect—such as the mechanical resonance frequency fr, the quality factor Q and the magnitude of the magnetoelectric coefficient αE at the resonance frequency—are contingent on temperature. The interrelations between the temperature changes of the characteristics of the magnetoelectric effect and the temperature variations of the following material parameters—Young’s modulus Y, the acoustic quality factor of individual layers, the dielectric constant ε, the piezoelectric modulus d of the piezoelectric layer as well as the piezomagnetic coefficients λ(n) of the ferromagnetic layer—are established. The effect of temperature on the characteristics of the nonlinear magnetoelectric effect is observed for the first time. The results can be useful for designing magnetoelectric heterostructures with specified temperature characteristics, in particular, for the development of thermally stabilized magnetoelectric devices. Full article
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Open AccessFeature PaperArticle Heat-Assisted Multiferroic Solid-State Memory
Materials 2017, 10(9), 991; doi:10.3390/ma10090991
Received: 14 July 2017 / Revised: 3 August 2017 / Accepted: 22 August 2017 / Published: 25 August 2017
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Abstract
A heat-assisted multiferroic solid-state memory design is proposed and analysed, based on a PbNbZrSnTiO3 antiferroelectric layer and Ni81Fe19 magnetic free layer. Information is stored as magnetisation direction in the free layer of a magnetic tunnel junction element. The bit
[...] Read more.
A heat-assisted multiferroic solid-state memory design is proposed and analysed, based on a PbNbZrSnTiO3 antiferroelectric layer and Ni81Fe19 magnetic free layer. Information is stored as magnetisation direction in the free layer of a magnetic tunnel junction element. The bit writing process is contactless and relies on triggering thermally activated magnetisation switching of the free layer towards a strain-induced anisotropy easy axis. A stress is generated using the antiferroelectric layer by voltage-induced antiferroelectric to ferroelectric phase change, and this is transmitted to the magnetic free layer by strain-mediated coupling. The thermally activated strain-induced magnetisation switching is analysed here using a three-dimensional, temperature-dependent magnetisation dynamics model, based on simultaneous evaluation of the stochastic Landau-Lifshitz-Bloch equation and heat flow equation, together with stochastic thermal fields and magnetoelastic contributions. The magnetisation switching probability is calculated as a function of stress magnitude and maximum heat pulse temperature. An operating region is identified, where magnetisation switching always occurs, with stress values ranging from 80 to 180 MPa, and maximum temperatures normalised to the Curie temperature ranging from 0.65 to 0.99. Full article
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Open AccessArticle The Microstructural Characterization of Multiferroic LaFeO3-YMnO3 Multilayers Grown on (001)- and (111)-SrTiO3 Substrates by Transmission Electron Microscopy
Materials 2017, 10(7), 839; doi:10.3390/ma10070839
Received: 31 May 2017 / Revised: 15 July 2017 / Accepted: 17 July 2017 / Published: 21 July 2017
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Abstract
The microstructure of multiferroic LaFeO3-YMnO3 (LFO-YMO) multilayers grown on (001)- and (111)-SrTiO3 substrates is characterized by the transmission electron microscopy (TEM). Detailed TEM characterization reveals that LFO-YMO multilayers grown on both substrates have clear layer-by-layer morphology and distinct chemical-composition
[...] Read more.
The microstructure of multiferroic LaFeO3-YMnO3 (LFO-YMO) multilayers grown on (001)- and (111)-SrTiO3 substrates is characterized by the transmission electron microscopy (TEM). Detailed TEM characterization reveals that LFO-YMO multilayers grown on both substrates have clear layer-by-layer morphology and distinct chemical-composition layered structure. The most notable feature is that LFO-YMO multilayers grown on (001)-SrTiO3 substrate have three types of domains, while those on (111)-SrTiO3 have only one. The multi-/twin- domain structure can be qualitatively explained by the lattice mismatch in this system. The details of the domain structure of LFO-YMO multilayers are crucial to understanding their magnetic properties. Full article
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Open AccessArticle Enhanced Multiferroic Properties of YMnO3 Ceramics Fabricated by Spark Plasma Sintering Along with Low-Temperature Solid-State Reaction
Materials 2017, 10(5), 474; doi:10.3390/ma10050474
Received: 19 March 2017 / Revised: 16 April 2017 / Accepted: 24 April 2017 / Published: 28 April 2017
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Abstract
Based on precursor powders with a size of 200–300 nm prepared by the low-temperature solid-state reaction method, phase-pure YMnO3 ceramics are fabricated using spark plasma sintering (SPS). X-ray diffraction (XRD) and scanning electron microscopy (SEM) reveal that the high-purity YMnO3 ceramics
[...] Read more.
Based on precursor powders with a size of 200–300 nm prepared by the low-temperature solid-state reaction method, phase-pure YMnO3 ceramics are fabricated using spark plasma sintering (SPS). X-ray diffraction (XRD) and scanning electron microscopy (SEM) reveal that the high-purity YMnO3 ceramics can be prepared by SPS at 1000 °C for 5 minutes with annealing at 800 °C for 2 h. The relative density of the sample is as high as 97%, which is much higher than those of the samples sintered by other methods. The present dielectric and magnetic properties are much better than those of the samples fabricated by conventional methods and SPS with ball-milling precursors, and the ferroelectric loops at room temperature can be detected. These findings indicate that the YMnO3 ceramics prepared by the low temperature solid reaction method and SPS possess excellent dielectric lossy ferroelectric properties at room temperature, and magnetic properties at low temperature (10 K), making them suitable for potential multiferroic applications. Full article
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Review

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Open AccessFeature PaperReview Measurement Techniques of the Magneto-Electric Coupling in Multiferroics
Materials 2017, 10(8), 963; doi:10.3390/ma10080963
Received: 17 July 2017 / Revised: 7 August 2017 / Accepted: 9 August 2017 / Published: 17 August 2017
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Abstract
The current surge of interest in multiferroic materials demands specialized measurement techniques to support multiferroics research. In this review article we detail well-established measurement techniques of the magneto-electric coupling coefficient in multiferroic materials, together with newly proposed ones. This work is intended to
[...] Read more.
The current surge of interest in multiferroic materials demands specialized measurement techniques to support multiferroics research. In this review article we detail well-established measurement techniques of the magneto-electric coupling coefficient in multiferroic materials, together with newly proposed ones. This work is intended to serve as a reference document for anyone willing to develop experimental measurement techniques of multiferroic materials. Full article
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