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Special Issue "Functional Magnetic and Dielectric Composites: Fabrication, Properties and Applications"

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A special issue of Coatings (ISSN 2079-6412).

Deadline for manuscript submissions: 30 June 2023 | Viewed by 4095

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Special Issue Editors

Dr. Chuanjian Wu

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Guest Editor

School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 610054, China
Interests: magnetic materials; magnetic thin films; ferrites; hexagonal ferrites

Prof. Dr. Lezhong Li

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Guest Editor

College of Optoelectronic Engineering, Chengdu University of Information Technology, Chengdu 610025, China
Interests: magnetic materials; dielectric materials; magnetic thin films; ferrites

Dr. Qifan Li

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Guest Editor

School of Materials and Energy, University of Electronic Science and Technology of China, Chengdu 610054, China
Interests: magnetic materials; microwave materials; magnetodielectric materials; ferrites

Special Issue Information

Dear Colleagues,

For many years, functional magnetic and dielectric composites have been attractive to both academia and industry in various applications, such as electric energy convention, wireless communication, sensors, biomedical treatment, etc. Modern challenges in the characteristics of these applications, including high power, lightweight, durability, and resource-friendliness, place more stringent demands for the research on functional magnetic and dielectric composites. To solve these challenges, it is crucial to understand the interaction mechanisms of multiphase magnetic and dielectric composite systems. Advanced fabrication techniques are also important for the effective assembly of magnetic and dielectric composites with complex microstructures. More importantly, the properties of magnetic and dielectric composites can be tailored by modifying the multiphase interaction or preparation methods. Driven by the extreme application environment, high-performance magnetic and dielectric composites which can withstand high power, high temperatures, high stress have seen a huge demand in experimental, theoretical and modeling activities.

This Special Issue of Coatings aims to provide a collection of papers focusing on the fabrication, properties, and applications of functional magnetic and dielectric composites. Original research articles and reviews are welcome in this Special Issue. Research topics welcome in this Special Issue may include (but are not limited to) the following:

Theoretical and experimental research on the interaction mechanisms of multiphase magnetic and dielectric composite systems;
Recent developments in preparation methods of functional magnetic and dielectric composites;
Advanced preparation techniques for high-performance magnetic and dielectric nanocomposites;.
Theoretical and experimental research on complex microstructures of composites;
Recent developments in characterization, test, and measurement methods for mechanical, chemical, and electrochemical properties and performances;
Recent developments in novel application areas of functional magnetic and dielectric composites;
Modeling, simulation, and calculation of the properties, performance, durability, and reliability of the composites in various applications.
High-performance magnetic and dielectric composites for high power, high temperatures, high stress, and other extreme environment applications.

We look forward to receiving your contributions.

Dr. Chuanjian Wu
Prof. Dr. Lezhong Li
Dr. Qifan Li
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. Coatings 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 2200 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

magnetic and dielectric composites
nanocomposites
preparation methods
complex microstructure
advanced characterization

Published Papers (5 papers)

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Research

Open AccessArticle

Influences of Magnetization Direction on the Flux Leakage Field of Weld Defects

Yunfei Ye

Kailun Ji

and

Ping Wang

Coatings 2023, 13(6), 1005; https://doi.org/10.3390/coatings13061005 - 29 May 2023

Viewed by 263

Abstract

The magnetic flux leakage (MFL) detection technique is applied to the detection of weld defects, such as cracks and pores. As the weld has a distinct structure, there are differences in the magnetization path and leakage field intensity under different magnetization directions. According to surveys, a suitable magnetization direction can significantly enhance detection rates of small-sized defects by stimulating a stronger field signal of the defect leakage. In this study, ANSYS finite element simulation software is used to calculate the weld defect leakage field based on the quantitative analysis. Specifically, the leakage field component strengths of circular hole defects and longitudinal rectangular groove defects are compared when the magnetization direction is perpendicular or parallel to the weld. Furthermore, the characteristic rules of the defect leakage field and its components under any magnetization direction are discussed, and a weld MFL detection platform is set up for validation. According to the experimental results, the amplitude of the magnetic leakage signal during vertical magnetization of circular hole defects is only 18.6% of that during parallel magnetization. Similarly, the amplitude of the magnetic leakage signal during parallel magnetization of longitudinal crack-type defects is only 9.2%~29.3% of that during vertical magnetization. Full article

(This article belongs to the Special Issue Functional Magnetic and Dielectric Composites: Fabrication, Properties and Applications)

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Open AccessArticle

Effects of Substrates on Thin-Film Growth of Nickel Zinc Ferrite by Spin-Spray Deposition

and

Coatings 2023, 13(4), 690; https://doi.org/10.3390/coatings13040690 - 28 Mar 2023

Viewed by 434

Abstract

In certain applications, such as on-chip integrated inductors, ferrite materials are highly desirable owing to their superior magnetic and insulation properties. Spin-spray deposition is a promising method for producing high-quality thin films of ferrite, as it does not require a vacuum and can operate at low temperatures. A comprehensive analysis was conducted to investigate the influence of the substrate on the microstructure and magnetic properties of the thin films, and the growth mechanism of this phenomenon was discussed. In addition, first-order reversal curve measurements were used to study the coercivity and grain size distribution. The results indicate that thermal conductivity played a significant role in determining the thin-film growth during spin spray deposition. Polyimide is considered a more suitable substrate under this process due to its appropriate thermal conductivity, which results in more uniform grain distribution and improved magnetic properties, with maximum permeability and a cutoff frequency reaching 55 and 485 MHz, respectively. Our results provide valuable insights into the mechanism of spin-spray deposition and offer an effective way to tune the performance of ferrite thin-film materials. Full article

(This article belongs to the Special Issue Functional Magnetic and Dielectric Composites: Fabrication, Properties and Applications)

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Open AccessArticle

Strain Modulation of Microstructure, Magnetic Domains, and Magnetic Properties of Ti/Fe/Ni₈₁Fe₁₉/Fe/Ti Multilayer Thin Films

and

Coatings 2023, 13(2), 363; https://doi.org/10.3390/coatings13020363 - 05 Feb 2023

Viewed by 619

Abstract

A simple and convenient method is demonstrated in this work by continuously applying uniaxial tensile strains to tune the high-frequency properties of flexible magnetic films. The magnetostriction effect causes the uniaxial magnetic anisotropy in the Ti/Fe/Ni₈₁Fe₁₉/Fe/Ti multilayer film when the flexible substrate transitions from the convex state to the planar state after preparation. In addition, the microstructure, magnetic domain morphology, and the high-frequency magnetic performance of the pre-strained Ti/Fe/Ni₈₁Fe₁₉/Fe/Ti multilayer films are investigated. The results show that the flexible Ti/Fe/Ni₈₁Fe₁₉/Fe/Ti multilayer films’ initial permeability can be monotonically varied over a hundred units, and the resonant frequency can be adjusted around 1.5 GHz. The flexible Ti/Fe/Ni₈₁Fe₁₉/Fe/Ti films, with their elastic-tunable magnetic performance, are promising candidate materials for flexible microwave devices. Full article

(This article belongs to the Special Issue Functional Magnetic and Dielectric Composites: Fabrication, Properties and Applications)

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Open AccessArticle

A Four-Band Terahertz Metamaterial Sensor Based on Symmetric E-Shaped Structure

and

Coatings 2022, 12(11), 1694; https://doi.org/10.3390/coatings12111694 - 07 Nov 2022

Viewed by 964

Abstract

To realize the multi-frequency selectivity of the analyte, a novel four-band terahertz metamaterial sensor is proposed in this work. In particular, the sensor performance is analyzed theoretically and numerically within a terahertz frequency range (0.8–1.5 THz) via the finite element method. According to the results, higher-order Fano resonance is the main cause of the four narrow and sharp transmission valleys in the operating band region of the sensor, yielding high resolution with Q values up to 177. Moreover, this sensor is polarization-insensitive over a wide polarization angle range of 0° to 50°. In addition, the sensor achieves refractive index sensitivity of 200 GHz/RIU and offers FOM values of up to 26.7. The sensor proposed in this study exhibits a simple structure, frequency selection characteristics, low cost, and enhances the interaction between terahertz waves and substances, which is of great theoretical and practical significance for the development of terahertz functional devices such as sensors and filters. Full article

(This article belongs to the Special Issue Functional Magnetic and Dielectric Composites: Fabrication, Properties and Applications)

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Open AccessArticle

Design and Fabrication of Temperature-Compensated Film Bulk Acoustic Resonator Filter Based on the Stress Compensation Effect

and

Coatings 2022, 12(8), 1126; https://doi.org/10.3390/coatings12081126 - 05 Aug 2022

Cited by 1 | Viewed by 1171

Abstract

To ensure that the performance of filters matches the continuous development in communication frequency bands, the influence of temperature on filter performance must be considered during the fabrication of filters. In this study, a cavity-type temperature-compensated film bulk acoustic resonator (TC-FBAR) device was prepared with an SiO₂ temperature filter between the bottom electrode and the piezoelectric layer. A one-dimensional Mason model of the TC-FBAR was established. An advanced design system, a high-frequency structure simulator, and COMSOL software were used to optimize the design of the TC-FBAR. After the optimization, the out-of-band rejection was improved by 10 dB. To address the compensation effect of the tensile and compressive stresses, a multilayer film was implemented for low-stress control and a reduction in stress to |P| ≤ 150 MPa, thereby improving the orientation of the piezoelectric film. Moreover, the influence of the thickness of the SiO₂ temperature-compensated layers on the temperature-compensated characteristics was studied. When the SiO₂ thickness was 50 nm, the temperature coefficient of frequency (TCF) was ±1 ppm/°C. The center frequency and 3 dB bandwidth of TC-FBAR were 2.492 GHz and 15.02 MHz, respectively, and the center insertion loss was −3.1 dB. Moreover, the out-of-band rejection was greater than 40 dBc, and TCF was 0.8 ppm/°C. Full article

(This article belongs to the Special Issue Functional Magnetic and Dielectric Composites: Fabrication, Properties and Applications)

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