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Micromachines
Special Issues
Recent Advances in Magnetoelectric Materials and Devices
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Recent Advances in Magnetoelectric Materials and Devices

A special issue of Micromachines (ISSN 2072-666X). This special issue belongs to the section "D：Materials and Processing".

Deadline for manuscript submissions: closed (31 March 2023) | Viewed by 3502

Special Issue Editors

Dr. Yiwen Zhang

E-Mail Website
Guest Editor
School of Materials Science and Engineering, Tianjin University, Tianjin 300350, China
Interests: nanocomposite magnetic materials; tunneling magneto-resistant; magnetite nanoparticle; superparamagnetic
Dr. Yang Cao

E-Mail Website
Guest Editor
Frontier Research Institute for Interdisciplinary Sciences, Tohoku University, Sendai 980-8578, Japan
Interests: nanocomposites; nanomagnetism; magnetoelectric materials; tunnel magnetodielectric; spintronics

Special Issue Information

Dear Colleagues,

Over the last several decades, the magnetoelectric (ME) effect has advanced rapidly and significantly, attracting both research and industrial attention. ME materials have been created in bulk and thin film, including single-phase compounds and composites such as piezoelectric/magnetostrictive composites in layered, granular, or pillared form via strain-mediated contact. ME materials exhibit a wide range of successful device applications, including ME antennas, magnetic field sensors, and actuators, to mention a few, that are lightweight, tiny, and low power and are dramatically transforming our daily lives. Both potential and challenges abound from the perspective of ME materials and devices, and many unanswered questions remain. Accordingly, this Special Issue seeks to showcase research papers, and review articles that focus on (1) new design, fabrication, characterization of ME materials in either single phase or composite form; and (2) modeling and characterization of ME devices with various configurations.

Dr. Yiwen Zhang
Dr. Yang Cao
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 submissions that pass pre-check are 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. Micromachines 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 2600 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

  • fabrication and characterization
  • modeling
  • single-phase
  • nanocomposites
  • dynamic behavior

Published Papers (3 papers)

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Research

14 pages, 8958 KiB  
Article
A Cotton Fabric Composite with Light Mineral Oil and Magnetite Nanoparticles: Effects of a Magnetic Field and Uniform Compressions on Electrical Conductivity
by Gabriela-Eugenia Iacobescu, Madalin Bunoiu, Ioan Bica, Paula Sfirloaga and Larisa-Marina-Elisabeth Chirigiu
Micromachines 2023, 14(6), 1113; https://doi.org/10.3390/mi14061113 - 25 May 2023
Viewed by 893
Abstract
Over the past few decades, tactile sensors have become an emerging field of research with direct applications in the area of biomedical engineering. New types of tactile sensors, called magneto-tactile sensors, have recently been developed. The aim of our work was to create [...] Read more.
Over the past few decades, tactile sensors have become an emerging field of research with direct applications in the area of biomedical engineering. New types of tactile sensors, called magneto-tactile sensors, have recently been developed. The aim of our work was to create a low-cost composite whose electrical conductivity depends on mechanical compressions that can be finely tuned using a magnetic field for magneto-tactile sensor fabrication. For this purpose, 100% cotton fabric was impregnated with a magnetic liquid (EFH-1 type) based on light mineral oil and magnetite particles. The new composite was used to manufacture an electrical device. With the experimental installation described in this study, we measured the electrical resistance of an electrical device placed in a magnetic field in the absence or presence of uniform compressions. The effect of uniform compressions and the magnetic field was the induction of mechanical–magneto–elastic deformations and, as a result, variations in electrical conductivity. In a magnetic field with a flux density of 390 mT, in the absence of mechanical compression forces, a magnetic pressure of 5.36 kPa was generated, and the electrical conductivity increased by 400% compared to that of the composite in the absence of a magnetic field. Upon increasing the compression force to 9 N, in the absence of a magnetic field, the electrical conductivity increased by about 300% compared to that of the device in the absence of compression forces and a magnetic field. In the presence of a magnetic flux density of 390 mT, and when the compression force increased from 3 N to 9 N, the electrical conductivity increased by 2800%. These results suggest the new composite is a promising material for magneto-tactile sensors. Full article
(This article belongs to the Special Issue Recent Advances in Magnetoelectric Materials and Devices)
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17 pages, 5606 KiB  
Article
Geometry–Dependent Magnetoelectric and Exchange Bias Effects of the Nano L–T Mode Bar Structure Magnetoelectric Sensor
by Treetep Saengow and Rardchawadee Silapunt
Micromachines 2023, 14(2), 360; https://doi.org/10.3390/mi14020360 - 31 Jan 2023
Cited by 1 | Viewed by 1074
Abstract
The geometry–dependent magnetoelectric (ME) and exchange bias (EB) effects of the nano ME sensor were investigated. The sensor consisted of the Longitudinal–Transverse (L–T) mode bi–layer bar structure comprising the ferromagnetic (FM) and ferroelectric (FE) materials and the anti–ferromagnetic (AFM) material. The bi–layer ME [...] Read more.
The geometry–dependent magnetoelectric (ME) and exchange bias (EB) effects of the nano ME sensor were investigated. The sensor consisted of the Longitudinal–Transverse (L–T) mode bi–layer bar structure comprising the ferromagnetic (FM) and ferroelectric (FE) materials and the anti–ferromagnetic (AFM) material. The bi–layer ME coefficient was derived from constitutive equations and Newton’s second law. The trade–off between peak ME coefficient and optimal thickness ratio was realized. At the frequency × structure length = 0.1 and 1200, minimum and maximum peak ME coefficients of the Terfenol–D/PZT bi-layer were around 1756 and 5617 mV/Oe·cm, respectively, with 0.43 and 0.19 optimal thickness ratios, respectively. Unfortunately, the bi-layer could not distinguish the opposite magnetic field directions due to their similar output voltages. PtMn and Cr2O3, the AFM, were introduced to produce the EB effect. The simulation results showed the exchange field starting at a minimum PtMn thickness of 6 nm. Nevertheless, Cr2O3 did not induce the exchange field due to its low anisotropy constant. The tri–layer ME sensor consisting of PZT (4.22 nm)/Terfenol–D (18 nm)/PtMn (6 nm) was demonstrated in sensing 2 Tbit/in2 magnetic bits. The average exchange field of 5100 Oe produced the output voltage difference of 12.96 mV, sufficient for most nanoscale magnetic sensing applications. Full article
(This article belongs to the Special Issue Recent Advances in Magnetoelectric Materials and Devices)
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10 pages, 3115 KiB  
Article
A Shear-Mode Magnetoelectric Heterostructure with Enhanced Magnetoelectric Response for Stray Power-Frequency Magnetic Field Energy Harvesting
by Wei He
Micromachines 2022, 13(11), 1882; https://doi.org/10.3390/mi13111882 - 1 Nov 2022
Cited by 2 | Viewed by 1127
Abstract
This paper devises a magnetoelectric (ME) heterostructure to harvest ambient stray power-frequency (50 Hz or 60 Hz) magnetic field energy. The device explores the shear piezoelectric effect of the PZT-5A plates and the magnetostrictive activity of the Terfenol-D plates. The utilization of the [...] Read more.
This paper devises a magnetoelectric (ME) heterostructure to harvest ambient stray power-frequency (50 Hz or 60 Hz) magnetic field energy. The device explores the shear piezoelectric effect of the PZT-5A plates and the magnetostrictive activity of the Terfenol-D plates. The utilization of the high-permeability films helps to enhance the magnetoelectric response to the applied alternating magnetic field. A theoretical model is developed based on the piezomagnetic and piezoelectric constitutive equations as well as the boundary conditions. The ME response of the device is characterized theoretically and experimentally. The measured ME voltage coefficient attains 165.2 mV/Oe at the frequency of 50 Hz, which shows a good agreement with the theoretical result. The feasibility for extracting energy from the 50 Hz magnetic field is validated. Under an external alternating magnetic field of 30 Oe, a maximum power of 8.69 μW is generated across an optimal load resistance of 693 kΩ. Improvements of the ME heterostructure are practicable, which allows an enhancement of the ME voltage coefficient and the maximum power by optimizing the structural parameters and utilizing PMN-PT with a higher shear-mode piezoelectric voltage coefficient (g15). Full article
(This article belongs to the Special Issue Recent Advances in Magnetoelectric Materials and Devices)
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