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Magnetochemistry
Special Issues
Design and Applications of Advanced Magnetic Ceramic Materials: New Insights
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Design and Applications of Advanced Magnetic Ceramic Materials: New Insights

A special issue of Magnetochemistry (ISSN 2312-7481).

Deadline for manuscript submissions: 26 September 2025 | Viewed by 1736

Special Issue Editor

Dr. Vasiliki Tsakaloudi

E-Mail Website
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 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 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

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

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Published Papers (2 papers)

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Research

17 pages, 6448 KiB  
Article
Development of NiZn Ferrites Doped with Co for Low Power Losses at High Frequencies (10 MHz) and High Temperatures (>80 °C)
by Stefanos Zaspalis, Georgios Kogias, Vassilios Zaspalis, Eustathios Kikkinides, Elisabeth Rauchenwald, Christoph Vogler and Kevin Ouda
Magnetochemistry 2025, 11(5), 44; https://doi.org/10.3390/magnetochemistry11050044 - 17 May 2025
Viewed by 404
Abstract
Polycrystalline nickel–zinc (NiZn) ferrites are widely used in high-frequency applications due to their excellent magnetic properties such as low power losses, high magnetic permeability, and adequate saturation induction. However, data on their power loss behavior at 10 MHz, particularly at elevated temperatures, remain [...] Read more.
Polycrystalline nickel–zinc (NiZn) ferrites are widely used in high-frequency applications due to their excellent magnetic properties such as low power losses, high magnetic permeability, and adequate saturation induction. However, data on their power loss behavior at 10 MHz, particularly at elevated temperatures, remain limited in the literature. This study investigates the magnetic performance of Co-doped NiZn ferrites at 10 MHz, under varying induction fields (3–10 mT) and temperatures (20–120 °C), with a focus on reducing high-temperature losses. Ferrite samples were synthesized using the conventional mixed oxide method and systematically varied in composition (Fe, Co content and Ni/Zn molar ratio). Key findings reveal that the incorporation of cobalt significantly enhances high-temperature performance by shifting resonance frequencies, attributed to increased domain wall pinning. Samples with optimized compositions and processing demonstrated power losses at 10 MHz, 10 mT and 25 °C, 100 °C and 120 °C as low as 310 mW cm−3, 1233 mW cm−3 and 1400 mW cm−3, respectively, with relative initial permeabilities exceeding 80 at these temperatures. These results provide insights into the design of high-frequency magnetic components and highlight strategies to minimize high-temperature losses. Full article
(This article belongs to the Special Issue Design and Applications of Advanced Magnetic Ceramic Materials: New Insights)
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12 pages, 13760 KiB  
Article
Phase Formation, Microstructure, and Permeability of Fe-Deficient Ni-Cu-Zn Ferrites (II): Effect of Oxygen Partial Pressure
by Christoph Priese and Jörg Töpfer
Magnetochemistry 2024, 10(12), 97; https://doi.org/10.3390/magnetochemistry10120097 - 3 Dec 2024
Cited by 1 | Viewed by 828
Abstract
We have investigated the phase formation, microstructure, and permeability of stoichiometric and Fe-deficient Ni-Cu-Zn ferrites of composition Ni0.30Cu0.20Zn0.50+zFe2−zO4−(z/2) with 0 ≤ z ≤ 0.06 sintered at 1000 °C in various oxygen partial pressures p [...] Read more.
We have investigated the phase formation, microstructure, and permeability of stoichiometric and Fe-deficient Ni-Cu-Zn ferrites of composition Ni0.30Cu0.20Zn0.50+zFe2−zO4−(z/2) with 0 ≤ z ≤ 0.06 sintered at 1000 °C in various oxygen partial pressures pO2, which range from 0.21 atm down to 10−5 atm. The density of the sintered samples is almost independent of the pO2, whereas the grain size of the Fe-deficient ferrites decreases in more reducing atmospheres. Stoichiometric ferrites show a regular growth of single-phase ferrite grains if sintered in air. Sintering at pO2 ≤ 10−2 atm leads to the formation of a small amount of Cu2O at grain boundaries and triple points. Fe-deficient compositions (z > 0) form Cu-poor stoichiometric ferrites, which coexist with a minority CuO phase homogeneously distributed between the grains after sintering in air. At pO2 ≤ 10−2 atm, the CuO grain boundary phase starts to transform into Cu2O, which concentrates at some triple points at pO2 = 10−2 atm, and it is more homogeneously distributed between the ferrite grains at the lower pO2. Formation of the Cu oxide second phases is investigated using XRD, SEM, and EDX. The permeability at 1 MHz of the stoichiometric ferrites (z = 0) is between µ′ = 200 and µ′ = 300 within the studied range of the pO2. The permeability at 1 MHz of the Fe-deficient samples decreases with the pO2, e.g., from µ′ = 750 at pO2 = 0.21 atm to µ′ = 320 at pO2 = 10−5 atm for z = 0.02, respectively. Full article
(This article belongs to the Special Issue Design and Applications of Advanced Magnetic Ceramic Materials: New Insights)
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