New Trends in Materials for Permanent Magnets

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

Deadline for manuscript submissions: 20 January 2025 | Viewed by 464

Special Issue Editors


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Guest Editor
National Institute of Research and Development for Technical Physics, Mangeron Av 47, 6600 Iaşi, Romania
Interests: magnetic materials; magnetic properties; permanent magnets; nanocomposite materials; physics of surfaces and interfaces; magnetic thin films
Special Issues, Collections and Topics in MDPI journals

E-Mail Website
Guest Editor
National Institute of Research and Development for Technical Physics, Mangeron Av 47, 6600 Iaşi, Romania
Interests: nanostructured materials; advanced materials; nanoparticle synthesis; surface characterization; magnetic materials
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Permanent magnets are one of the most important materials in modern technology, being widely used in industrial and military systems and everyday life. The fields of application of permanent magnets, such as the energy/electrical, information/communication technology, automotive/robotics, and biomedical engineering industries, are fully expanding, leading to an accelerated demand for high-performance permanent magnets. This, together with growing concerns about environmental degradation due to the exploitation of rare earths, rising costs, and availability problems of rare earths, has led to intense efforts worldwide to search for alternative materials with the potential to prepare new types of permanent magnets.

In this Special Issue, we would like to gather contributions that address the latest developments in the field of permanent magnets, such as improving magnetic properties, reasonable and balanced use of rare earth resources, recycling, and alternatives to rare-earth-based modeling.

Dr. Marian Grigoras
Dr. Mihaela Lostun
Guest Editors

Manuscript Submission Information

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Keywords

  • permanent magnet
  • magnetic materials
  • magnetic properties
  • maximum energy product
  • rare earth
  • nanocomposite
  • powders
  • melt-spun ribbons
  • recycling

Published Papers (1 paper)

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Research

13 pages, 851 KiB  
Article
Theoretical Study of the Magnetic Properties of the SmFe12−xMox (x = 1,2) and SmFe10Mo2H Compounds
by Diana Benea, Eduard Barna, Viorel Pop and Olivier Isnard
Crystals 2024, 14(7), 598; https://doi.org/10.3390/cryst14070598 - 27 Jun 2024
Viewed by 240
Abstract
We present theoretical investigations examining the electronic and magnetic properties of the SmFe12-xMox (x = 1,2) and SmFe10Mo2H compounds, including magneto-crystalline anisotropy, magnetic moments, exchange-coupling parameters, and Curie temperatures. The spin-polarized fully relativistic Korringa–Kohn–Rostoker (SPR-KKR) band [...] Read more.
We present theoretical investigations examining the electronic and magnetic properties of the SmFe12-xMox (x = 1,2) and SmFe10Mo2H compounds, including magneto-crystalline anisotropy, magnetic moments, exchange-coupling parameters, and Curie temperatures. The spin-polarized fully relativistic Korringa–Kohn–Rostoker (SPR-KKR) band structure method has been employed, using the coherent potential approximation (CPA) to deal with substitutional disorder. Hubbard-U correction was applied to the local spin density approximation (LSDA+U) in order to account for the significant correlation effects arising from the 4f electronic states of Sm. According to our calculations, the total magnetic moments increases with H addition, in agreement with experimental data. Adding one H atom in the near-neighbor environment of the Fe 8j site reduces the magnetic moments of Fe 8j and enhances the magnetic moment of Fe 8f. For every investigated alloy, the site-resolved spin magnetic moments of Fe on the 8i, 8j, and 8f sites exhibit the same magnitude sequence, with msFe (8i) > msFe (8j) > msFe (8f). While the addition of H has a positive impact on magneto-crystalline anisotropy energy (MAE), the increase in Mo concentration is detrimental to MAE. The computed exchange-coupling parameters reveal the highest values between the closest Fe 8i spins, followed by Fe 8i and Fe 8j spins, for all investigated alloys. The Curie temperature of the alloys under investigation is increased by decreasing the Mo concentration or by H addition, which is qualitatively consistent with experimental findings. Full article
(This article belongs to the Special Issue New Trends in Materials for Permanent Magnets)
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