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
Advanced Magnetic Materials
share announcement

Advanced Magnetic Materials

A special issue of Metals (ISSN 2075-4701).

Deadline for manuscript submissions: closed (30 November 2020) | Viewed by 20360

Special Issue Editor

Prof. Dr. Jiro Kitagawa

E-Mail Website
Guest Editor
Department of Electrical Engineering, Faculty of Engineering, Fukuoka Institute of Technology, 3–30-1 Wajiro-higashi, Higashi-ku, Fukuoka 811–0295, Japan
Interests: high-entropy alloys; magnetic materials; alloys; rare metals; superconducting materials; recycle
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The research area of magnetic materials is still increasing. Ferromagnets have recently played important roles in magnetic refrigeration, thermoelectricity, and so on. Antiferromagnets are expected to be the next-generation spintronics materials due to the lack of a stray magnetic field. One of the hot topics is the relation between magnetic property and microstructure, especially in the research field of permanent magnets.

The control of the magnetic state is essential in engineering. The magnetic state can be often tuned by a chemical method using an interstitial site or atomic substitution. High-entropy alloys are state-of-the-art hard materials. A control of the magnetic state following the high-entropy alloy concept might lead to a multifunctional material. The control of the magnetic state by external fields such as the optical wave and the electric field is also interesting. Associated with the development of nanotechnology, the fields of spintronics and nanostructured magnetic materials are offering many new fascinating magnetic phenomena. Magnetic materials are also well investigated in fundamental works, with some examples of the latest topics including the multichannel Kondo effect, multipolar effect, and quantum spin liquid.

The goal of this Special Issue is to collect articles mainly concerning the frontiers of research in magnetic materials. Both experimental and theoretical approaches are encouraged, and review articles are also welcome. Furthermore, research articles of the development of measurement and analysis methods to assess, for example, spin current, the magnetization of a tiny sample or under extreme conditions, and accurate crystal structure are welcome.

Topics of interest include but are not limited to:

  • Ferromagnetic and antiferromagnetic materials;
  • Relation between magnetic property and microstructure;
  • Control of magnetic state;
  • High-entropy alloy;
  • Spintronics;
  • Nanostructure;
  • Physics, chemistry, and metallurgy;
  • Measurement;
  • Analysis method.

Prof. Dr. Jiro Kitagawa
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

  • Ferromagnetic and antiferromagnetic materials
  • Microstructure
  • Control of magnetic state
  • High-entropy alloy
  • Spintronics
  • Bulk and nanomaterials
  • Development of measurement and analysis methods

Published Papers (6 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

Jump to: Review

7 pages, 2137 KiB  
Article
Uniaxial-Pressure-Induced Release of Magnetic Frustration in a Triangular Lattice Antiferromagnet YbCuGe
by Kazunori Umeo, Daichi Watanabe, Koji Araki, Kenichi Katoh and Toshiro Takabatake
Metals 2021, 11(1), 30; https://doi.org/10.3390/met11010030 - 25 Dec 2020
Cited by 3 | Viewed by 1961
Abstract
We have studied the effect of geometrical frustration on the antiferromagnetic order in the Yb-based triangular lattice compound YbCuGe below TN = 4.2 K by the measurements of magnetization and specific heat under hydrostatic and uniaxial pressures. By applying hydrostatic pressure P [...] Read more.
We have studied the effect of geometrical frustration on the antiferromagnetic order in the Yb-based triangular lattice compound YbCuGe below TN = 4.2 K by the measurements of magnetization and specific heat under hydrostatic and uniaxial pressures. By applying hydrostatic pressure P up to 1.34 GPa, TN hardly changes. By contrast, TN increases as P is applied along the hexagonal a axis, while TN decreases by the application of P along the c axis. The increase of TN only for P‖a suggests the release of the frustration inherent in the triangular lattice of Yb ions of this compound. Full article
(This article belongs to the Special Issue Advanced Magnetic Materials)
►▼ Show Figures

Figure 1

16 pages, 10115 KiB  
Article
Magnetic and Magnetocaloric Effect of Laves Phase Compounds Er(Fe0.8−xMn0.2−yCox+y)2 with x, y = 0.0 or 0.1
by Safa Othmani, Ichrak Chaaba, Sonia Haj-Khlifa, Patricia de Rango and Daniel Fruchart
Metals 2020, 10(9), 1247; https://doi.org/10.3390/met10091247 - 16 Sep 2020
Cited by 2 | Viewed by 2375
Abstract
Magnetic and magnetocaloric effect (MCE) of the Er(Fe0.8−xMn0.2−yCox+y)2 Laves phase-type compounds have been investigated. X-ray diffraction (XRD) analysis has revealed that these compounds crystallize with the C15 type Laves phase structure (Space [...] Read more.
Magnetic and magnetocaloric effect (MCE) of the Er(Fe0.8−xMn0.2−yCox+y)2 Laves phase-type compounds have been investigated. X-ray diffraction (XRD) analysis has revealed that these compounds crystallize with the C15 type Laves phase structure (Space Group Fd-3m). The magnetization curves indicate a ferri-magnetic-ordering resulting of the antiparallel coupling between the moments of the heavy rare earth Er and the transition metal (TM). The partial substitution of Fe/Mn by Co increases the Curie temperature from 355 K for Er(Fe0.8Mn0.2)2 to 475, 550, and 555 K for Er(Fe0.7Mn0.2Co0.1)2, Er(Fe0.8Mn0.1Co0.1)2, and Er(Fe0.7Mn0.1Co0.2)2, respectively. According to the nature of the TM elements, arguments were presented forwards either Molecular Field or Spin Fluctuation Theory, even Stoner type pictures should be considered for. MCE was calculated according to the Maxwell relation based on isotherm magnetization measurements. The magnetic entropy change (−∆SM) observed on a 300–400 K temperature range can be understood in terms of a Spin Fluctuation Theory picture supported by both the different magnetic polarization levels that were shared by the TM elements and the related interatomic exchange forces. Full article
(This article belongs to the Special Issue Advanced Magnetic Materials)
►▼ Show Figures

Figure 1

11 pages, 2520 KiB  
Article
Effect of the Sputtering Power on the Structure, Morphology and Magnetic Properties of Fe Films
by Chunxia Zhou, Tongkui Li, Xianshun Wei and Biao Yan
Metals 2020, 10(7), 896; https://doi.org/10.3390/met10070896 - 05 Jul 2020
Cited by 24 | Viewed by 4989
Abstract
In this paper, the radio frequency (RF) magnetron sputtering (MS) method was utilized to fabricate multiple sets of the iron film samples under different sputtering powers. With the help of X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM) and vibrating [...] Read more.
In this paper, the radio frequency (RF) magnetron sputtering (MS) method was utilized to fabricate multiple sets of the iron film samples under different sputtering powers. With the help of X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM) and vibrating sample magnetometer (VSM), how the sputtering power affected the structure, morphology and magnetic properties of the iron film was studied. XRD results showed that all Fe films have a polycrystalline bcc structure and (110) preferred orientation. According to the Bragg equation calculation, the larger the sputtering power, the larger the average grain size, which is consistent with the results of AFM particle size analysis. The main reason is that the sputtering power affects the grain growth mode. As the sputtering power increases, it gradually changes from a small island-like growth to a thick columnar growth. However, from the surface morphology and height profile, we saw that the iron film deposited under 230 W had the most uniform grain size distribution and the grain size was relatively small. This is why thin films deposited under this condition have the best soft magnetic properties. The saturation magnetization (Ms) reaches 1566 emu/cm3, coercivity (Hc) is 112 Oe, and squareness ratio (Mr/Ms) is 0.40. Therefore, iron film prepared under 230 W has good comprehensive properties (highest Ms, lower Hc and Mr/Ms) that provide an experimental basis for further thin film research work. Full article
(This article belongs to the Special Issue Advanced Magnetic Materials)
►▼ Show Figures

Figure 1

15 pages, 3248 KiB  
Article
Silicon Steel Strip Profile Control Technology for Six-High Cold Rolling Mill with Small Work Roll Radius
by Hainan He, Jian Shao, Xiaochen Wang, Quan Yang and Xiawei Feng
Metals 2020, 10(3), 401; https://doi.org/10.3390/met10030401 - 21 Mar 2020
Cited by 3 | Viewed by 4175
Abstract
Due to the requirement of magnetic properties of silicon steel sheets, producing high-precision size strips is the main aim of the cold rolling industry. The tapered work roll shifting technique of the six-high cold rolling mill is effective in reducing the difference in [...] Read more.
Due to the requirement of magnetic properties of silicon steel sheets, producing high-precision size strips is the main aim of the cold rolling industry. The tapered work roll shifting technique of the six-high cold rolling mill is effective in reducing the difference in transverse thickness of the strip edge, but the effective area is limited, especially for a high crown strip after the hot rolling process. The six-high mill with a small work roll size can produce a strip with higher strength and lower thickness under a smaller rolling load. At the same time, the profile of the strip can be substantially improved. By advancing a well-established analytical method, a series of simulation analyses are conducted to reveal the effectiveness of a small work roll radius for the strip profile in the six-high cold rolling process. Through the analysis of flattening deformation and deflection deformation on the load, the change rule of the strip profile produced by the work roll with a small roll diameter can be obtained. Combined with theoretical analysis and industrial experiments, it can be found that the improvement effect of the small work roll radius on the profile of the silicon strip is as significant. Full article
(This article belongs to the Special Issue Advanced Magnetic Materials)
►▼ Show Figures

Figure 1

14 pages, 4880 KiB  
Article
The Impact of the Composition Effect on Ferromagnetic Properties of Tb2Co2Ga
by Seiya Tanaka, Hirotaka Terada, Naoki Shirakawa, Masami Tsubota and Jiro Kitagawa
Metals 2019, 9(12), 1242; https://doi.org/10.3390/met9121242 - 20 Nov 2019
Cited by 3 | Viewed by 1932
Abstract
The ferromagnetic properties of Tb2Co2Ga, crystallizing into an orthorhombic W2CoB2-type structure, were investigated by preparing 11 polycrystalline samples with different starting atomic compositions. We found that Tb2Co2Ga possesses a homogeneity range [...] Read more.
The ferromagnetic properties of Tb2Co2Ga, crystallizing into an orthorhombic W2CoB2-type structure, were investigated by preparing 11 polycrystalline samples with different starting atomic compositions. We found that Tb2Co2Ga possesses a homogeneity range in the ternary phase diagram. The Curie temperature TC is sensitive to the atomic composition and ranges rather widely, i.e., from 75 to 145 K. For the samples with a TC above 90 K, the nearest Tb–Tb and the Tb–Co distances would be important factors deciding TC, considering the RKKY interaction through the hybridization between Tb and Co atoms. An anisotropic change of two kinds of Co–Tb–Co angles in the octahedron formed by two Tb and four Co atoms occurs in the samples with a TC lower than 90 K. Such a change of octahedral parameters seems to be related to a difference of shapes in the ac magnetization anomaly at TC between the samples in the lowest TC (~ 75 K) group and those in the other groups. Full article
(This article belongs to the Special Issue Advanced Magnetic Materials)
►▼ Show Figures

Figure 1

Review

Jump to: Research

24 pages, 4634 KiB  
Review
Interstitial Atom Engineering in Magnetic Materials
by Jiro Kitagawa, Kohei Sakaguchi, Tomohiro Hara, Fumiaki Hirano, Naoki Shirakawa and Masami Tsubota
Metals 2020, 10(12), 1644; https://doi.org/10.3390/met10121644 - 06 Dec 2020
Cited by 14 | Viewed by 4059
Abstract
Interstitial light elements play an important role in magnetic materials by improving the magnetic properties through changes of the unit cell volume or through orbital hybridization between the magnetic and interstitial atoms. In this review focusing on the effects of interstitial atoms in [...] Read more.
Interstitial light elements play an important role in magnetic materials by improving the magnetic properties through changes of the unit cell volume or through orbital hybridization between the magnetic and interstitial atoms. In this review focusing on the effects of interstitial atoms in Mn-based compounds, which are not well researched, the studies of interstitial atoms in three kinds of magnetic materials (rare-earth Fe-, Mn-, and rare-earth-based compounds) are surveyed. The prominent features of Mn-based compounds are interstitial-atom-induced changes or additional formation of magnetism—either a change from antiferromagnetism (paramagnetism) to ferromagnetism or an additional formation of ferromagnetism. It is noted that in some cases, ferromagnetic coupling can be abruptly caused by a small number of interstitial atoms, which has been overlooked in previous research on rare-earth Fe-based compounds. We also present candidates of Mn compounds, which enable changes of the magnetic state. The Mn-based compounds are particularly important for the easy fabrication of highly functional magnetic devices, as they allow on-demand control of magnetism without causing a large lattice mismatch, among other advantages. Full article
(This article belongs to the Special Issue Advanced 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 1-6
Back to TopTop