Search for Articles:
Title / Keyword
Author / Affiliation / Email
Journal
Article Type
 
 
Advanced Search
 
Section
Special Issue
Volume
Issue
Number
Page
 
4.4
2.9
Journals
Metals
Special Issues
Phase Transition and Magnetic Effect of Magnetic Alloy
share announcement

Phase Transition and Magnetic Effect of Magnetic Alloy

A special issue of Metals (ISSN 2075-4701). This special issue belongs to the section "Entropic Alloys and Meta-Metals".

Deadline for manuscript submissions: 31 July 2024 | Viewed by 5768

Special Issue Editor

Dr. Jihoon Park

E-Mail Website
Guest Editor
Department of Magnetic Materials, Powder Materials Division, Korea Institute of Materials Science, Changwon, Gyeongsangnam-do 51508, Korea
Interests: magnetic properties; phase transformation; microstructure; hard magnetic materials; soft magnetic materials; rare-earth free materials; rare-earth materials

Special Issue Information

Dear Colleagues,

Since a couple hundred years ago, there has been a keen desire both to understand the magnetic phenomena and to use them in an effort to enrich human life, the beginnings of the development of magnetics being related to the development of metallurgy, which started some 150–200 years ago. This yielded hypotheses concerning a variety of magnetic effects of magnetic materials, possibly originating not only from their magnetic and/or crystal structures, but also external influences such as pressure, temperature, etc., usually accompanied by the phase transition of the alloys. Such phenomena include increasing the magnetization and coercivity, exchanging coupling, striction, optical effects, etc. Understanding the magnetic effects of magnetic materials is the key to expanding the usability of the materials, i.e., it is impossible to effectively utilize the magnetic material without its full understanding. Therefore, the Special Issue entitled “Phase Transition and Magnetic Effect of Magnetic Alloy” aims to deepen our understanding of the magnetic effects and their relations with the phase transition.

In this Special Issue, we hope to gather articles related to the magnetic effects and phase transitions of magnetic materials, with magnetic and physical properties supporting magnetic effects also being of interest as well as also welcoming theoretical and experimental in-depth analyses of already well-known magnetic effects.

Dr. Jihoon Park
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. Metals 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 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

  • ferromagnetism
  • ferrimagnetism
  • paramagnetism
  • diamagnetism
  • antiferromagnetism
  • superparamagnetism
  • Joule effect
  • Faraday effect
  • Einstein-de-Haas effect
  • Barkhausen effect
  • magnetoresistance effect
  • exchange bias effect
  • magnetocaloric effect
  • magneto-optical effect

Published Papers (4 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

14 pages, 3698 KiB  
Article
Optimizing Annealing Temperature Control for Enhanced Magnetic Properties in Fe-Si-B Amorphous Flake Powder Cores
by Hea-Ran Kim, Dongsup Lee, Sangsun Yang, Young-Tae Kwon, Jongryoul Kim, Yunseok Kim and Jae-Won Jeong
Metals 2023, 13(12), 2016; https://doi.org/10.3390/met13122016 - 15 Dec 2023
Cited by 1 | Viewed by 877
Abstract
In this study, we examined the optimal pre- and post-annealing conditions for soft magnetic composites (SMCs) using amorphous flake powders produced through ball milling of amorphous Fe-Si-B ribbons, leading to enhanced magnetic properties. The SMCs, which utilized flake powders created via melt spinning, [...] Read more.
In this study, we examined the optimal pre- and post-annealing conditions for soft magnetic composites (SMCs) using amorphous flake powders produced through ball milling of amorphous Fe-Si-B ribbons, leading to enhanced magnetic properties. The SMCs, which utilized flake powders created via melt spinning, displayed outstanding DC bias characteristics, as well as increased permeability, primarily due to high saturation magnetization and the flaky morphology of the powders. Pre-annealing was performed not only to remove residual stress formed during the melt spinning process but also to improve pulverizing efficiency, which ultimately affected the particle size of the flake powders. Core annealing was performed to reduce core losses and improve permeability by relieving the residual stress generated during the pressing process. As a result, pre-annealing and core annealing temperatures were identified as crucial factors influencing the magnetic properties of the SMCs. We meticulously analyzed the particle size, the morphology of the flake powder, and the magnetic properties of the SMCs in relation to the annealing temperatures. In conclusion, we demonstrated that flake powder SMCs achieved superior soft magnetic properties, including significantly reduced core loss and heightened permeability, through optimal pre- and core-annealing at 370 °C and 425 °C, respectively. Full article
(This article belongs to the Special Issue Phase Transition and Magnetic Effect of Magnetic Alloy)
►▼ Show Figures

Figure 1

13 pages, 5526 KiB  
Article
Improved Soft Magnetic Properties in FeNi@MgO Composites by Sol-Gel-Based Surface Coating and High-Temperature Heat Treatment
by Jeong-Hyeon Park, Hea-Ran Kim, Jung-Woo Lee and Jae-Won Jeong
Metals 2023, 13(8), 1383; https://doi.org/10.3390/met13081383 - 01 Aug 2023
Cited by 1 | Viewed by 1360
Abstract
In this study, we utilized MgO as an insulating buffer layer to enhance the thermal stability and soft magnetic properties of Fe-Ni soft magnetic composites (SMCs) and investigated the effect of high-temperature heat treatment on those soft magnetic properties. By employing the sol-gel [...] Read more.
In this study, we utilized MgO as an insulating buffer layer to enhance the thermal stability and soft magnetic properties of Fe-Ni soft magnetic composites (SMCs) and investigated the effect of high-temperature heat treatment on those soft magnetic properties. By employing the sol-gel process, a uniform MgO insulating layer with a thickness of 600 nm was coated onto Fe-Ni magnetic powder. Subsequently, high-density SMCs were fabricated through high-pressure compaction molding. The MgO layer remained intact up to 800 °C, leading to the FeNi@MgO@MK SMCs exhibiting enhanced permeability and reduced hysteresis loss due to grain enlargement and elimination of defects, such as dislocation stacking. Notably, the dynamic loss increase after high-temperature heat treatment was significantly regulated compared to the case of the uncoated counterpart. The results underscore the potential to improve the thermal stability and soft magnetic properties of MgO-coated Fe-Ni SMCs, rendering them suitable for various electromagnetic applications. Full article
(This article belongs to the Special Issue Phase Transition and Magnetic Effect of Magnetic Alloy)
►▼ Show Figures

Figure 1

10 pages, 2389 KiB  
Article
Effect of Secondary Phases on Multi-Step Phase Transitions and Magnetocaloric Properties in MnFe-Based Alloys
by A-Young Lee, Min-Ha Lee, Song-Yi Kim, JunHee Han, Ki-Hoon Kang and Jong-Woo Kim
Metals 2022, 12(11), 1967; https://doi.org/10.3390/met12111967 - 17 Nov 2022
Viewed by 1320
Abstract
This study investigated the effect of the secondary phases on multi-step phase transitions and the magnetocaloric properties depending on the Ge content in the MnFeCoPSiGe alloys. Two-step phase transitions were observed by the variations of the Fe2P-type hexagonal structure (first-order) and [...] Read more.
This study investigated the effect of the secondary phases on multi-step phase transitions and the magnetocaloric properties depending on the Ge content in the MnFeCoPSiGe alloys. Two-step phase transitions were observed by the variations of the Fe2P-type hexagonal structure (first-order) and secondary phases (second-order). The Curie temperature alters with non-linear behavior consistent with change of the lattice parameters. In addition, the magnetic entropy change decreased with the increase of the Ge content and, subsequently, fractions of the secondary phases. However, the morphological variation of microstructure, distributed as a circular-type shape of the Fe2P-type hexagonal structure in the Ge-rich matrix, increased the magnetic entropy change. Therefore, the addition of Ge enables the control of the Curie temperature to be applicable for high temperature operating devices. The control of the secondary phases and morphology of the microstructure are crucial to improve the phase transition and magnetic entropy change. Full article
(This article belongs to the Special Issue Phase Transition and Magnetic Effect of Magnetic Alloy)
►▼ Show Figures

Figure 1

8 pages, 1726 KiB  
Article
Physical and Magnetic Properties of ThMn12-Type Sm(Fe0.8Co0.2)10Si2 Melt-Spun Ribbons
by Hui-Dong Qian, Jung Tae Lim, Jong-Woo Kim, Yang Yang, Tian Hong Zhou, Han Kook Jeon, Jihoon Park and Chul-Jin Choi
Metals 2022, 12(5), 753; https://doi.org/10.3390/met12050753 - 28 Apr 2022
Cited by 4 | Viewed by 1559
Abstract
The magnetic properties of ThMn12-type Fe-rich compounds were investigated by producing Sm(Fe0.8Co0.2)10Si2 ribbons. The produced ribbons, with different conditions by varying the melt-spinning conditions, were characterized to investigate physical and magnetic properties. Weight fraction [...] Read more.
The magnetic properties of ThMn12-type Fe-rich compounds were investigated by producing Sm(Fe0.8Co0.2)10Si2 ribbons. The produced ribbons, with different conditions by varying the melt-spinning conditions, were characterized to investigate physical and magnetic properties. Weight fraction of ThMn12-type phase decreased from 94.5 to 57.1 wt. % as the melt-spinning wheel speed increased from 6.5 to 39 m/s, and corresponding magnetizations and coercivities were substantially varied; the coercivity increased up to 0.175 T from 0.058 T by increasing the wheel speed from 6.5 to 26 m/s, and their magnetization also increased from 89.81 Am2/kg to 105.58 Am2/kg, even though the content of ThMn12-type phase decreased. Morphologies of the ribbons were also observed to verify the melt-spinning effects on the surface conditions and grain sizes. It was found that the particle and grain sizes in the ribbons became smaller and striped patterns appeared as the wheel speed increased. The grain size decreased from about 1 μm to 250 nm by increasing the wheel speed from 6.5 to 39 m/s. Full article
(This article belongs to the Special Issue Phase Transition and Magnetic Effect of Magnetic Alloy)
►▼ Show Figures

Figure 1

Show export options expand_more Show export options expand_less
Select all
Export citation of selected articles as:
 
Displaying articles 1-4
Back to TopTop