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Special Issue Editor

Dr. Vasiliki Tsakaloudi

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Guest Editor

Centre for Research and Technology Hellas (CERTH), 57001 Thermi, Greece
Interests: targeted material design and development of soft ferrites; grain boundary engineering; polycrystalline microstructure engineering; power electronics; automotive applications; telecommunication applications
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue, entitled “Development and Applications of Advanced Magnetic Ceramic Materials”, aims to include the newest and most important research in the field of magnetic ceramics, in terms of chemical composition design, synthesis processes, as well as morphological and microstructural characteristics towards specific magnetic performance. With an almost 100-year history of advanced magnetic ceramics, global market trends have governed a wide range of applications, such as in motors, rotors, EMI suppression, signal processing, power conversion, data storage, telecommunications, green technologies, electric vehicles, wireless charging, handheld devices, biomedical applications, and many others. Thus, it is of major significance to explore and extend the current knowledge on material performance and potential, so as to enhance future technological breakthroughs in the field. As a Guest Editor of this Special Issue of the open-access journal Magnetochemistry, I am honored to invite you to contribute your original manuscripts and share new important results with the scientific community.

Dr. Vasiliki Tsakaloudi
Guest Editor

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. Magnetochemistry 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 2700 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

ferrimagnetism
magnetic ceramic materials
spinels
hexagonal ferrites
garnets
synthesis process
magnetic permeability
power losses
polycrystalline microstructure
doping

Published Papers (2 papers)

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Research

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14 pages, 3509 KiB

Open AccessFeature PaperArticle

Phase Formation, Microstructure and Permeability of Fe-Deficient Ni-Cu-Zn Ferrites, (I): Effect of Sintering Temperature

by Christoph Priese and Jörg Töpfer

Magnetochemistry 2021, 7(8), 118; https://0-doi-org.brum.beds.ac.uk/10.3390/magnetochemistry7080118 - 14 Aug 2021

Cited by 2 | Viewed by 1943

Abstract

We have studied the densification, phase formation, microstructure, and permeability of stoichiometric and Fe-deficient Ni-Cu-Zn ferrites of composition Ni_0.30Cu_0.20Zn_0.50+zFe_2-zO_4-(z/2) with 0 ≤ z ≤ 0.06 sintered at temperatures from 900 °C to 1150 °C. The shrinkage is shifted from 1000 °C for z = 0 towards lower temperatures and reaches its maximum rate at 900 °C for z = 0.02. Stoichiometric ferrites show regular growth of single-phase ferrite grains if sintered at T_s ≤ 1100 °C. Sintering at 1150 °C leads to the formation of a small amount of Cu₂O, triggering exaggerated grain growth. Fe-deficient compositions (z > 0) form Cu-poor stoichiometric ferrites coexisting with a minority CuO phase after sintering at 900–1000 °C. At T_s ≥ 1050 °C, CuO transforms into Cu₂O, and exaggerated grain growth is observed. The formation of Cu oxide second phases is investigated using XRD, SEM, and EDX. The permeability of the ferrites increases with sintering temperature up to a maximum permeability of µ = 230 for z = 0 or µ = 580 for z = 0.02, respectively, at T_s = 1000 °C. At higher sintering temperatures, the permeability decreases, which is due to the formation of a microstructure with intra-crystalline porosity in large grains, and a non-magnetic Cu oxide grain boundary phase. Full article

(This article belongs to the Special Issue Development and Applications of Advanced Magnetic Ceramic Materials)

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Review

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27 pages, 8096 KiB

Open AccessFeature PaperReview

Magnetic Losses in Soft Ferrites

by Samuel Dobák, Cinzia Beatrice, Vasiliki Tsakaloudi and Fausto Fiorillo

Magnetochemistry 2022, 8(6), 60; https://0-doi-org.brum.beds.ac.uk/10.3390/magnetochemistry8060060 - 02 Jun 2022

Cited by 22 | Viewed by 3453

Abstract

We review the basic phenomenology of magnetic losses from DC to 1 GHz in commercial and laboratory-prepared soft ferrites considering recent concepts regarding their physical interpretation. This is based, on the one hand, on the identification of the contributions to the magnetization process provided by spin rotations and domain walls and, on the other hand, the concept of loss separation. It additionally contemplates a distinction between the involved microscopic dissipation mechanisms: spin damping and eddy currents. Selected experimental results on the broadband behavior of complex permeability and losses in Mn-Zn ferrites provide significant examples of their dependence on sintering methods, solute elements, and working temperature. We also highlight the peculiar frequency and temperature response of Ni-Zn ferrites, which can be heavily affected by magnetic aftereffects. The physical modeling of the losses brings to light the role of the magnetic anisotropy and the way its magnitude distribution, affected by the internal demagnetizing fields, acts upon the magnetization process and its dependence on temperature and frequency. It is shown that the effective anisotropy governs the interplay of domain wall and rotational processes and their distinctive dissipation mechanisms, whose contributions are recognized in terms of different loss components. Full article

(This article belongs to the Special Issue Development and Applications of Advanced Magnetic Ceramic Materials)

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