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Crystals
Special Issues
The Synthesis and Prospects of Magnetic Materials
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The Synthesis and Prospects of Magnetic Materials

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Crystalline Metals and Alloys".

Deadline for manuscript submissions: 20 December 2024 | Viewed by 1015

Special Issue Editors

Dr. Jiayi He

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Guest Editor
Shenzhen Institute of Advanced Technology, Chinese Academy of Sciences, Shenzhen 518055, China
Interests: permanent magnet; soft magnetic material; grain boundary modification; micromagnetic simulation; electromagnetic simulation
Dr. Xuefeng Liao

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Guest Editor
Institute of Resources Utilization and Rare Earth Development, Guangdong Academy of Sciences, Guangdong 510650, China
Interests: magnetic materials and magnetism; rare earth (RE)-based permanent magnets; condensed matter physics; micromagnetic simulation
Dr. Jiasheng Zhang

E-Mail Website
Guest Editor
National Institute for Materials Science, Tsukuba 305-0047, Japan
Interests: permanent magnets; microstructure characterization; micromagnetic simulation; machine learning; soft magnetic materials

Special Issue Information

Dear Colleagues,

Magnetic materials are defined as materials with ferromagnetic or ferrimagnetic ordering. In a broad sense, they also include weak magnetic and antiferromagnetic materials which can provide magnetism and a magnetic effect. Emerging fields such as renewable energy, robotics, biomedicine and new generation communication provide further applications of magnetic materials. Magnetic materials including hard and soft magnets, magnetocaloric materials, magnetic shape memory alloys and magnetorheological fluids have attracted more attention in recent years and will undergo rapid development in the near future.

This Special Issue, entitled “The Synthesis and Prospects of Magnetic Materials”, focuses on the synthesis, preparation, microstructure and properties of various crystalline magnetic materials. We welcome reviews and research articles on crystalline magnetic materials, magnetic simulation and machine learning of these materials, as well as electromagnetic simulation of magnetic devices such as motors, inductors and sensors. We also encourage the submission of articles related to novel magnetism-related properties.

Dr. Jiayi He
Dr. Xuefeng Liao
Dr. Jiasheng Zhang
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at mdpi.longhoe.net 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. Crystals 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 2100 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

  • magnetism
  • magnetic material
  • magnetic device
  • micromagnetic simulation
  • electromagnetic simulation
  • machine learning

Published Papers (2 papers)

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Research

13 pages, 3371 KiB  
Article
Tuning Fe2Ti Distribution to Enhance Extrinsic Magnetic Properties of SmFe12-Based Magnets
by **bo Wei, Shuainan Xu, Chengyuan Xu, **aolian Liu, Yu Pan, Wei Wang, Yue Wu, ** Chen, Jun Liu, Lizhong Zhao and Xuefeng Zhang
Crystals 2024, 14(6), 572; https://doi.org/10.3390/cryst14060572 - 20 Jun 2024
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Abstract
The ThMn12-type SmFe12-based rare-earth permanent magnet has attracted widespread attention due to its excellent intrinsic magnetic properties and high-temperature stability. However, the challenge in realizing continuous non-magnetic or weakly magnetic grain boundary phases equilibrated with the SmFe12 main [...] Read more.
The ThMn12-type SmFe12-based rare-earth permanent magnet has attracted widespread attention due to its excellent intrinsic magnetic properties and high-temperature stability. However, the challenge in realizing continuous non-magnetic or weakly magnetic grain boundary phases equilibrated with the SmFe12 main phase hinders the enhancement in extrinsic magnetic properties of the SmFe12-based permanent magnet, especially for the coercivity. In this work, by controlling the cooling rate, the uniform distribution of paramagnetic Fe2Ti phases at grain boundaries is achieved in the SmFe12-based alloy ribbon, resulting in a high coercivity of 7.95 kOe. This improvement is attributed to the elimination of the impurity phase within the SmFe12 main phase and the magnetic isolation effect of the grain boundary phase composed of paramagnetic Fe2Ti, which is directly observed by transmission electron microscopy and further confirmed by micromagnetic simulation. Moreover, first-principles calculations show that the V element can dope into Fe2Ti and facilitate the transition of its paramagnetic state at room temperature. This study provides new insights into constructing weakly magnetic grain boundary phases for SmFe12-based permanent magnets, offering a novel approach to enhance coercivity. Full article
(This article belongs to the Special Issue The Synthesis and Prospects of Magnetic Materials)
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11 pages, 2872 KiB  
Article
First-Principles Study of Ti-Do** Effects on Hard Magnetic Properties of RFe11Ti Magnets
by Chengyuan Xu, Lin Wen, Anjian Pan, Lizhong Zhao, Yuansen Liu, Xuefeng Liao, Yu Pan and Xuefeng Zhang
Crystals 2024, 14(6), 507; https://doi.org/10.3390/cryst14060507 - 27 May 2024
Viewed by 438
Abstract
Due to the rare earth supply shortage, ThMn12-type RFe12-based (R is the rare earth element) magnets with lean rare earth content are gaining more concern. Most ThMn12-type RFe12 structures are thermodynamically metastable and require do** of [...] Read more.
Due to the rare earth supply shortage, ThMn12-type RFe12-based (R is the rare earth element) magnets with lean rare earth content are gaining more concern. Most ThMn12-type RFe12 structures are thermodynamically metastable and require do** of the stabilizing element Ti. However, the Ti-do** effects on the hard magnetic properties of RFe11Ti have not been thoroughly investigated. Herein, based on density functional theory calculations, we report the Ti-do** effects on the phase stability, intrinsic hard magnetic properties and electronic structures of RFe11Ti (R = La, Ce, Pr, Nd, Sm, Y, Zr). Our results indicate that Ti-do** not only increases their phase stability, but also enhances the magnetic hardness of ground-state RFe12 phases. Particularly, it leads to the transition of CeFe11Ti and PrFe11Ti from easy-plane to easy-axis anisotropy. Charge density distributions demonstrate that Ti-do** breaks the original symmetry of the R-site crystal field, which alters the magnetic anisotropy of RFe11Ti. Projected densities of states reveal that the addition of Ti results in the shift of occupied and unoccupied f-electron energy levels of rare earth elements, affecting their magnetic exchange. This study provides an insight into regulating the hard magnetic properties of RFe12-based magnets by Ti-do**. Full article
(This article belongs to the Special Issue The Synthesis and Prospects of Magnetic Materials)
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