Search for Articles:
Title / Keyword
Author / Affiliation / Email
Journal
Article Type
 
 
Advanced Search
 
Section
Special Issue
Volume
Issue
Number
Page
 
4.2
2.4
Journals
Crystals
Special Issues
Superconductors and Magnetic Materials
share announcement

Superconductors and Magnetic Materials

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Inorganic Crystalline Materials".

Deadline for manuscript submissions: 31 May 2025 | Viewed by 7227

Special Issue Editors

Dr. António José Arsénio Costa

E-Mail Website
Guest Editor
Laboratório Associado de Energia Transportes e Aeronáutica (LAETA), Instituto de Engenharia Mecânica (IDMEC), Lisbon, Portugal
Interests: magnetization of superconductor bulks; superconducting magnets; superconducting magnetic energy storage; passive and active maglev bearings; electromagnetic actuators; coupled electromagnetic–thermal finite element analysis
Prof. Dr. Elkin Ferney Rodriguez Velandia

E-Mail Website
Guest Editor
Departamento de Engenharia Elétrica (DEE/Poli), Universidade Federal do Rio de Janeiro (UFRJ), Rio de Janeiro, Brazil
Interests: superconducting MagLev applications; implementation of high-flux-density permanent magnet arrangements; static and dynamic magnetic field measurement; conception and design of cryostats; electromagnetic compensation systems
Dr. João Filipe Pereira Fernandes

E-Mail Website
Guest Editor
Instituto de Engenharia Mecânica (IDMEC), Instituto Superior Técnico (IST), Universidade Lisboa (UL), Lisbon, Portugal
Interests: electrical machines design and optimization; core and coreless superconducting machines; alternative for rare-earth electrical machines; special materials to reduce saturation in the magnetic circuit core; electrical machines for aircraft and automotive applications
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The expanding interest in decreasing the size and weight of electromagnetic devices and machinery implies the development of high-electromagnetic-power-density materials. This Special Issue focuses on the development and application of improved superconductor compounds, permanent magnets, and high-magnetic-permeability materials for power applications. Also, superconductor nanomaterials for high-sensing magnetic-field detection and quantum computing applications.

Superconductors are typically utilized as bulks and wires or tapes. Superconductor bulks are typically employed due to their ability to store or shield high magnetic field values. Superconductor wires or tapes are used to generate high magnetic fields due to their high current loading capabilities. Therefore, superconductors have been utilized in many applications, such as electrical machines and transformers, magnetic levitation or propulsion, magnetic shielding, electromagnets, superconducting magnetic energy storage and in strong magnets used in magnetic resonance, particle acceleration or collision, and confinement fusion. Also, quantum interference devices for high-sensing magnetic-field detection.

Permanent magnets are employed in electrical machines, and magnetic levitation or propulsion. High-magnetic-permeability materials enable the magnetic flux density in electrical machines, transformers, and electromagnets to be enhanced.

This Special Issue welcomes the submission of studies on the development of material crystals consisting of novel and doped compounds for superconductor bulks, wires and tapes, permanent magnets and high-magnetic-permeability materials. These include superconducting compounds, such as niobium–tin and niobium–titanium, magnesium diboride, cuprates, nickelates, carbon and iron alloys. High-magnetic-permeability materials include soft and hard ferrites, silicon–iron and cobalt–iron alloys. Permanent magnets include alnico, neodymium–iron–boron and samarium–cobalt alloys.

This Special Issue welcomes the contribution of original research papers that address the latest findings in the development and application of superconducting materials and advanced magnetic materials. In addition, we welcome the submission of studies on the variation in the electromagnetic characteristics of new and existing superconducting and magnetic materials in different pressure and temperature operating conditions, the identification of innovative and improved power or magnetic-field sensing applications using existing or novel materials of these types, and the assessment of the utilization of rare-earth-free magnetic materials.

Dr. António José Arsénio Costa
Prof. Dr. Elkin Ferney Rodriguez Velandia
Dr. João Filipe Pereira Fernandes
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. 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

  • high-electromagnetic-power density materials
  • superconductor compounds and nanomaterials
  • permanent magnets
  • high magnetic permeability materials
  • strong magnets
  • magnetic levitation or propulsion
  • magnetic shielding 
  • magnetic resonance
  • magnetic particle acceleration or collision
  • magnetic confinement fusion
  • superconducting magnetic energy storage
  • rare-earth free magnetic materials
  • superconducting quantum interference devices
  • high-sensing magnetic-field detection

Benefits of Publishing in a Special Issue

  • Ease of navigation: Grouping papers by topic helps scholars navigate broad scope journals more efficiently.
  • Greater discoverability: Special Issues support the reach and impact of scientific research. Articles in Special Issues are more discoverable and cited more frequently.
  • Expansion of research network: Special Issues facilitate connections among authors, fostering scientific collaborations.
  • External promotion: Articles in Special Issues are often promoted through the journal's social media, increasing their visibility.
  • e-Book format: Special Issues with more than 10 articles can be published as dedicated e-books, ensuring wide and rapid dissemination.

Further information on MDPI's Special Issue policies can be found here.

Published Papers (5 papers)

Download All Papers
Order results
Result details
Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:

Research

13 pages, 7509 KiB  
Article
Study on AC Loss of REBCO Tape Encapsulated with Magnetic Materials
by Wei Chen, Rong Jin, Yang Bai, Fei Chi, Jiaqing Xu, Xinsheng Yang and Yunpeng Zhu
Crystals 2025, 15(5), 407; https://doi.org/10.3390/cryst15050407 - 26 Apr 2025
Viewed by 188
Abstract
REBCO coated conductors have a multi-layer structure, and the outer encapsulation layer is generally made of non-magnetic copper material. This paper proposes a new structure of REBCO tape, which replaces the copper layer with magnetic material to explore its transport loss and magnetization [...] Read more.
REBCO coated conductors have a multi-layer structure, and the outer encapsulation layer is generally made of non-magnetic copper material. This paper proposes a new structure of REBCO tape, which replaces the copper layer with magnetic material to explore its transport loss and magnetization loss. The results indicate that copper-encapsulated REBCO tapes have lower transport losses at low currents, while tapes encapsulated with strong magnetic nickel alloy materials have the highest transport losses. At high transport currents, the transport losses of REBCO tapes encapsulated with different materials are almost equal. At low fields, the magnetization loss of the tape encapsulated with strong magnetic nickel alloy is lower, while the magnetization loss of the tape encapsulated with copper is the highest, due to the magnetic shielding effect of the magnetic material. Under high-field conditions, the difference in magnetization loss between magnetic material-encapsulated tapes and copper-encapsulated tapes decreases. Full article
(This article belongs to the Special Issue Superconductors and Magnetic Materials)
►▼ Show Figures

Figure 1

10 pages, 3191 KiB  
Article
Magnetic Flux Concentration Technology Based on Soft Magnets and Superconductors
by Yue Wu, Liye Xiao, Siyuan Han and Jiamin Chen
Crystals 2024, 14(8), 747; https://doi.org/10.3390/cryst14080747 - 22 Aug 2024
Cited by 1 | Viewed by 1423
Abstract
High-sensitivity magnetic sensors are fundamental components in fields such as biomedicine and non-destructive testing. Flux concentration technology enhances the sensitivity of magnetic sensors by amplifying the magnetic field to be measured, making it the most effective method to improve the magnetic field resolution [...] Read more.
High-sensitivity magnetic sensors are fundamental components in fields such as biomedicine and non-destructive testing. Flux concentration technology enhances the sensitivity of magnetic sensors by amplifying the magnetic field to be measured, making it the most effective method to improve the magnetic field resolution of magnetic sensors. Superconductors and high-permeability soft magnetic materials exhibit completely different magnetic effects. The former possesses complete diamagnetism, while the latter has extremely high magnetic permeability. Both types of materials can be used to fabricate flux concentrators. This paper compares superconducting and soft magnetic flux concentration technologies through theoretical simulations and experiments, investigating the impact of different structural parameters on the magnetic field amplification performance of superconducting and soft magnetic concentrators. This research is significant for the development of magnetic focusing technology and its applications in weak magnetic detection and other fields. Full article
(This article belongs to the Special Issue Superconductors and Magnetic Materials)
►▼ Show Figures

Figure 1

14 pages, 17665 KiB  
Article
Enhancing the Predictive Modeling of n-Value Surfaces in Various High Temperature Superconducting Materials Using a Feed-Forward Deep Neural Network Technique
by Shahin Alipour Bonab, Wenjuan Song and Mohammad Yazdani-Asrami
Crystals 2024, 14(7), 619; https://doi.org/10.3390/cryst14070619 - 5 Jul 2024
Cited by 1 | Viewed by 1167
Abstract
In this study, the prediction of n-value (index-value) surfaces—a key indicator of the field and temperature dependence of critical current density in superconductors—across various high-temperature superconducting materials is addressed using a deep learning modeling approach. As superconductors play a crucial role in [...] Read more.
In this study, the prediction of n-value (index-value) surfaces—a key indicator of the field and temperature dependence of critical current density in superconductors—across various high-temperature superconducting materials is addressed using a deep learning modeling approach. As superconductors play a crucial role in advanced technological applications in aerospace and fusion energy sectors, improving their performance model is essential for both practical and academic research purposes. The feed-forward deep learning network technique is employed for the predictive modeling of n-value surfaces, utilizing a comprehensive dataset that includes experimental data on material properties and operational conditions affecting superconductors’ behavior. The model demonstrates enhanced accuracy in predicting n-value surfaces when compared to traditional regression methods by a 99.62% goodness of fit to the experimental data for unseen data points. In this paper, we have demonstrated both the interpolation and extrapolation capabilities of our proposed DFFNN technique. This research advances intelligent modeling in the field of superconductivity and provides a foundation for further exploration into deep learning predictive models for different superconducting devices. Full article
(This article belongs to the Special Issue Superconductors and Magnetic Materials)
►▼ Show Figures

Figure 1

9 pages, 326 KiB  
Communication
Numerical Study on Monopole Production and Deconfinement Transition in Two-Condensate Charged Systems
by Kai Kang, Jie Li, Guo Wang, Jiangning Zhang, Jiantao Che, Tianyi Han and Hai Huang
Crystals 2024, 14(5), 397; https://doi.org/10.3390/cryst14050397 - 25 Apr 2024
Viewed by 1098
Abstract
The condensed matter Bose system may contain effective monopole quasiparticles in its excitation spectrum. In this paper, we first accomplish the mapping of the two-band Ginzburg–Landau theory to the extended CP1 model, and then perform the Monte Carlo simulations on the [...] Read more.
The condensed matter Bose system may contain effective monopole quasiparticles in its excitation spectrum. In this paper, we first accomplish the mapping of the two-band Ginzburg–Landau theory to the extended CP1 model, and then perform the Monte Carlo simulations on the 50×50×50 cubic lattice with periodic boundary conditions. With the numerical data of monopole density and magnetic susceptibility, we indicate that there exists a monopole–antimonopole deconfinement transition for the two-band superconducting system with the critical temperature above 70 K. We also suggest the possible detection of this new monopole plasma phase in high-Tc iron-based superconductors. Full article
(This article belongs to the Special Issue Superconductors and Magnetic Materials)
►▼ Show Figures

Figure 1

15 pages, 2052 KiB  
Article
The Study on the Critical Temperature and Gap-to-Tc Ratio of Yttrium Hydride Superconductors
by Pongkan Tongkhonburi, Pongkaew Udomsamuthirun, Arpapong Changjan, Suppanyou Meakniti and Thitipong Kruaehong
Crystals 2024, 14(2), 158; https://doi.org/10.3390/cryst14020158 - 1 Feb 2024
Cited by 1 | Viewed by 1797
Abstract
This study investigates the gap-to-Tc ratio (R) of yttrium hydride superconductors within the weak coupling limit. We derived an analytical formula for the gap-to-Tc ratio. The ratio of the gap-to-Tc is dependent on the pressure [...] Read more.
This study investigates the gap-to-Tc ratio (R) of yttrium hydride superconductors within the weak coupling limit. We derived an analytical formula for the gap-to-Tc ratio. The ratio of the gap-to-Tc is dependent on the pressure applied to each superconductor. The maximum ratio, approximately 3.85, is observed in one superconductor, while the lowest ratio, roughly 3.21, is found in another superconductor. Based on the findings of our study, it can be deduced that yttrium hydride superconductors exhibit attributes commonly associated with weak-coupling superconductors. The influence of the Coulomb potential is more pronounced at a critical temperature compared to the ratio of the gap to the critical temperature. Full article
(This article belongs to the Special Issue Superconductors and Magnetic Materials)
►▼ Show Figures

Figure 1

Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:
 
Displaying articles 1-5
Back to TopTop