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Advances in Multifunctional Magnetic Materials
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Advances in Multifunctional Magnetic Materials

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Materials Physics".

Deadline for manuscript submissions: closed (20 February 2024) | Viewed by 2053

Special Issue Editor

Dr. Emir Poskovic

E-Mail Website1 Website2
Guest Editor
Energy “G. Ferraris” Department, The Polytechnic University of Turin, 10129 Turin, Italy
Interests: soft and hard magnetic materials; magnetic measurement; electrical machines; alternative and renewable energy; thermographic iron losses detection
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

This Special Issue consists of the preparation, characterization, analysis and applications of Multifunctional Magnetic Materials, hard and soft, to provide a new solution for several industrial sectors, such as electrical machines, automotive, informatics, electronics, etc.

Topics include but are not limited to:

  • Permanent Magnets, both Sintered and Bonded: NdFeB, Ferrites, SmCo, AlNiCo; Innovative Rare Earth (RE) magnets, RE-Free magnet solutions, RE Recycling Processes;
  • Soft Magnetic Composite Materials and Alloys: preparation and characterization, organic and inorganic layer for ferromagnetic powder, amorphous powder, particle size effects, covering techniques and insulating materials used in Soft Magnetic Composite Materials, Production Processes;
  • Hybrid Magnets, Hybrid Composite Materials (HMC), Production Processes;
  • Additive manufacturing Magnetic Materials: adopted Techniques, Iron–Silicon powder, Non-destructive measurements;
  • Iron loss measurements and analysis, eddy current hysteresis and excess loss separation, initial permeability measurements, novel or optimized measurement techniques;
  • FE Analysis of magnetic behaviour related to magnetic structures, Iron Loss Models;
  • Life Cycle Assessment for magnetic materials, both soft and hard.
  • Applications in the electrical machine, electronic conversion devices, informatic and telecommunication sectors, low- and high-frequency use and other applications.

Dr. Emir Poskovic
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. Materials is an international peer-reviewed open access semimonthly 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

  • permanent magnets
  • bonded magnets
  • rare earth elements
  • RE-free magnets, RE recycling
  • ferrites magnets and powders
  • soft magnetic alloys
  • soft magnetic composite(SMC)
  • amorphous powder
  • iron–silicon powder
  • inorganic and organic layer
  • hybrid magnets
  • hybrid composite materials (HMC)
  • iron losses
  • magnetic characterization
  • initial permeability measurements
  • compression molding
  • injection molding
  • additive manufacturing magnetic powders and materials

Published Papers (2 papers)

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Research

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11 pages, 1067 KiB  
Article
The Field-Dependent Magnetic Viscosity of FeNdB Permanent Magnets
by Thomas Kresse, Gerhard Martinek, Gerhard Schneider and Dagmar Goll
Materials 2024, 17(1), 243; https://doi.org/10.3390/ma17010243 - 2 Jan 2024
Viewed by 761
Abstract
The time-dependent decrease of the magnetic polarization of magnet materials in the presence of an opposing field is well known as the magnetic viscosity or magnetic aftereffect. In previous studies, magnetic viscosity was usually measured in fields when in the vicinity of coercivity [...] Read more.
The time-dependent decrease of the magnetic polarization of magnet materials in the presence of an opposing field is well known as the magnetic viscosity or magnetic aftereffect. In previous studies, magnetic viscosity was usually measured in fields when in the vicinity of coercivity HcJ, and this was conducted in order to understand the coercivity mechanism in magnetic materials. In this study, the magnetic viscosity of commercial FeNdB magnets is determined at opposing fields weaker than HcJ and at different temperatures in the range from 303 to 433 K (i.e., from 30 to 160 °C) by means of a vibrating sample magnetometer (VSM). As a result, the parameter Sv, which describes the magnetic viscosity in the material, was found to increase with increases in the opposing field. Furthermore, both the parameter Sv and its dependence on the temperature were found to correlate with the coercivity HcJ of the material. Also, a difference with regard to the parameter Sv for the materials measured in this study with similar magnetic properties, but which had undergone different types of processing, could not be found. Knowledge of the field- and temperature-dependent behavior of the magnetic viscosity of FeNdB magnets allows for better estimations over the lifetime of a component under operating conditions with respect to the magnetic losses in FeNdB magnets that are used in electric components. Full article
(This article belongs to the Special Issue Advances in Multifunctional Magnetic Materials)
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Review

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39 pages, 6485 KiB  
Review
Mechanical and Magnetic Properties Variation in Non-Oriented Electrical Steels with Different Cutting Technology: A Review
by Gheorghe Paltanea, Veronica Manescu (Paltanea), Aurora Antoniac, Iosif Vasile Nemoianu and Horia Gavrila
Materials 2024, 17(6), 1345; https://doi.org/10.3390/ma17061345 - 14 Mar 2024
Cited by 2 | Viewed by 913
Abstract
The problem of energy consumption reduction establishes important challenges for electric motor producers in the framework of new international regulations regarding the conditions that must be accomplished by motors in the near future. One of the most important topics is related to the [...] Read more.
The problem of energy consumption reduction establishes important challenges for electric motor producers in the framework of new international regulations regarding the conditions that must be accomplished by motors in the near future. One of the most important topics is related to the core loss decrease directly linked to the effect of electrical steel degradation induced by the cutting technology. Understanding exactly how this phenomenon occurs by analyzing the chemical, mechanical, crystallographic, magnetic domain, and magnetic properties is of utmost importance when manufacturing processes must be changed and adapted to a new market characterized by high-efficiency motors. Today, mechanical and laser cutting technologies are the most used because of their reduced price and high-speed process. Still, unfortunately, these methods are not the best due to the fact that they lead, in most cases, to a high value of magnetic core losses, low electromagnetic torque, and hence reduced efficiency. This review paper shows that non-conventional technologies such as water jetting and electroerosion could be applied if proper modifications are added. This paper’s main idea is to present a comprehensive study regarding the impact of cutting technologies on microhardness and residual stresses, crystallographic texture, magnetic domain structure, and magnetic properties of some non-oriented electrical steels used in motor production. It provides a detailed analysis of the abovementioned aspects by including the authors’ research and findings in the wider context of other research group contributions. It also offers a general idea of the mechanisms present at the macro- and microscopic levels. The readers can find some of the most used analytical models, including the cutting process’s damaged effect on the magnetic properties’ variation based on a simple mathematical approach and examples of finite element modeling performed on real motor designs implemented in various programs. Last but not least, some practical implementations of the cutting procedure’s influence on motor working conditions are presented in the last section of the paper. It provides an up-to-date analysis regarding how the cutting method should be included in high-efficiency motor production by emphasizing the importance of the topic and identifying where supplementary research must be undertaken. From the investigated literature, by analyzing specific sample geometries associated with different characterization methods, it can be concluded that all the cutting technologies have an important contribution to the mechanical and magnetic quantities. When the magnetic core of an electric motor is produced through non-conventional methods, the overall influence of the cutting procedure has a low percentage in the motor efficiency, as presented in this paper. Full article
(This article belongs to the Special Issue Advances in Multifunctional Magnetic Materials)
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