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Materials
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Nanosized and Nanostructured Magnetic Materials: Experimental, Theoretical, and Computational Investigations
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Nanosized and Nanostructured Magnetic Materials: Experimental, Theoretical, and Computational Investigations

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Advanced Nanomaterials and Nanotechnology".

Deadline for manuscript submissions: 30 November 2024 | Viewed by 1946

Special Issue Editors

Dr. Tibor-Adrian Óvári

E-Mail Website
Guest Editor
National Institute of R&D for Technical Physics, 700050 Iași, Romania
Interests: amorphous and nanocrystalline ferromagnets; amorphous magnetic nan-owires; amorphous microwires; magnetic domain walls; magnetic nano- and microwires; magnetic sensors; magnetization dynamics; magnetization pro-cesses; nanocrystalline magnetic materials; soft magnetic materials
Dr. Nicoleta Lupu

E-Mail Website
Guest Editor
National Institute of R&D for Technical Physics, 700050 Iași, Romania
Interests: amorphous and nanocrystalline magnetic materials; bulk magnetic glasses; ferromagnetic microwires and nanowires; hard magnetic materials; magnetic nano- and microparticles; magnetic ribbons; magnetic sensors and devices; magnetic wires; medical applications of magnetic materials; soft magnetic materials

Special Issue Information

Dear Colleagues,

In this Special Issue, we aim to emphasize the most recent and most significant advances in the topics related to nanosized and nanostructured magnetic materials, e.g., nanoparticles, nanowires, nanotubes, nanostrips, various nanostructured magnetic materials, including nanocrystalline ones, having different shapes and sizes, and targeted for multiple applications. The focus on experimental methods and techniques, e.g., preparation (rapid solidification processes, different deposition procedures, atomization, milling, etc.), characterization (magnetic, structural, etc.), post-production enhancement of properties (annealing, mechanical processing, applied stresses, etc.), as well as on their application possibilities, will be complemented by novel theoretical and computational approaches in the investigation of these materials, such as modeling of their magnetic behavior and properties by means of analytical and numerical methods, simulation of the magnetic hysteresis, and other phenomena, including application-related ones. Applications will have a very important place in this Special Issue, given the diverse opportunities offered by the outstanding properties of the investigated nanosized and nanostructured magnetic materials, which range from micro- and nanosensing to engineering, biomedical, computing, and telecommunications, energy, and automotive applications, just to name a few.

This Special Issue will be an excellent guide and bibliographic resource for both scientists and industrial specialists with a thorough interest in the development, study, and application of such novel magnetic materials.

Dr. Tibor-Adrian Óvári
Dr. Nicoleta Lupu
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. Materials is an international peer-reviewed open access semimonthly 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

  • magnetic nanoparticles
  • magnetic nanostrips
  • magnetic nanotubes
  • magnetic nanowires
  • magnetic phenomena
  • magnetic properties
  • magnetic sensors
  • nanocrystalline magnets
  • nanosized magnetic materials
  • nanostructured magnetic materials

Published Papers (3 papers)

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Research

9 pages, 2034 KiB  
Article
The Effect of Magnetoelastic Anisotropy on the Magnetization Processes in Rapidly Quenched Amorphous Nanowires
by Cristian Rotarescu, Sorin Corodeanu, Costică Hlenschi, George Stoian, Horia Chiriac, Nicoleta Lupu and Tibor-Adrian Óvári
Materials 2024, 17(5), 1141; https://doi.org/10.3390/ma17051141 - 29 Feb 2024
Viewed by 422
Abstract
In this paper, we report for the first time on the theoretical and experimental investigation of Fe77.5Si7.5B15 amorphous glass-coated nanowires by analyzing samples with the same diameters in both cases. The hysteresis curves, the dependence of the switching [...] Read more.
In this paper, we report for the first time on the theoretical and experimental investigation of Fe77.5Si7.5B15 amorphous glass-coated nanowires by analyzing samples with the same diameters in both cases. The hysteresis curves, the dependence of the switching field values on nanowire dimensions, and the effect of the magnetoelastic anisotropy on the magnetization processes were analyzed and interpreted to explain the magnetization reversal in highly magnetostrictive amorphous nanowires prepared in cylindrical shape by rapid quenching from the melt. All the measured samples were found to be magnetically bistable, being characterized by rectangular hysteresis loops. The most important feature of the study is the inclusion of the magnetoelastic anisotropy term that originates in the specific production process of these amorphous nanowires. The results show that the switching field decreases when the nanowire diameter increases and this effect is due to the reduction in anisotropy and in the intrinsic mechanical stresses. Moreover, the obtained results reveal the importance of factors such as geometry and magnetoelastic anisotropy for the experimental design of cylindrical amorphous nanowires for multiple applications in miniaturized devices, like micro and nanosensors. Full article
(This article belongs to the Special Issue Nanosized and Nanostructured Magnetic Materials: Experimental, Theoretical, and Computational Investigations)
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12 pages, 3430 KiB  
Article
Melting, Solidification, and Viscosity Properties of Multicomponent Fe-Cu-Nb-Mo-Si-B Alloys with Low Aluminum Addition
by Yuri N. Starodubtsev, Vladimir S. Tsepelev, Viktor V. Konashkov and Nadezhda P. Tsepeleva
Materials 2024, 17(2), 474; https://doi.org/10.3390/ma17020474 - 19 Jan 2024
Viewed by 446
Abstract
Melting, solidification, and viscosity properties of multicomponent Fe-Cu-Nb-Mo-Si-B alloys with low aluminum addition (up to 0.42 at.% Al) were studied using an oscillating cup viscometer. It is shown that melting and solidification are divided into two stages with a knee point at 1461 [...] Read more.
Melting, solidification, and viscosity properties of multicomponent Fe-Cu-Nb-Mo-Si-B alloys with low aluminum addition (up to 0.42 at.% Al) were studied using an oscillating cup viscometer. It is shown that melting and solidification are divided into two stages with a knee point at 1461 K. The temperature dependences of the liquid fraction between the liquidus and solidus temperatures during melting and solidification are calculated. It has been proven that aluminum accelerates the processes of melting and solidification and leads to an increase in liquidus and solidus temperatures. In the liquid state at temperatures above 1700 K in an alloy with a low aluminum content, the activation energy of viscous flow increases. This growth was associated with the liquid–liquid structure transition, caused by the formation of large clusters based on the metastable Fe23B6 phase. Aluminum atoms attract iron and boron atoms and contribute to the formation of clusters based on the Fe2AlB2 phase and metastable phases of a higher order. Full article
(This article belongs to the Special Issue Nanosized and Nanostructured Magnetic Materials: Experimental, Theoretical, and Computational Investigations)
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24 pages, 8535 KiB  
Article
Electrodeposited Heusler Alloys-Based Nanowires for Shape Memory and Magnetocaloric Applications
by Michal Varga, Ladislav Galdun, Marek Vronka, Pavel Diko, Oleg Heczko and Rastislav Varga
Materials 2024, 17(2), 407; https://doi.org/10.3390/ma17020407 - 13 Jan 2024
Viewed by 674
Abstract
In this article, the downsizing of functional Heusler alloys is discussed, focusing on the published results dealing with Heusler alloy nanowires. The theoretical information inspired the fabrication of novel nanowires that are presented in the results section of the article. Three novel nanowires [...] Read more.
In this article, the downsizing of functional Heusler alloys is discussed, focusing on the published results dealing with Heusler alloy nanowires. The theoretical information inspired the fabrication of novel nanowires that are presented in the results section of the article. Three novel nanowires were fabricated with the compositions of Ni66Fe21Ga13, Ni58Fe28In14, and Ni50Fe31Sn19. The Ni66Fe21Ga13 nanowires were fabricated, aiming to improve the stoichiometry of previous functional Ni-Fe-Ga Heusler nanomaterials with a functional behavior above room temperature. They exhibit a phase transition at the temperature of ≈375 K, which results in a magnetocaloric response of |ΔSM| ≈ 0.12 J·kg−1·K−1 at the magnetic field change of only μ0ΔH = 1 T. Novel Heusler alloy Ni58Fe28In14 nanowires, as well as Ni50Fe31Sn19 nanowires, are analyzed for the first time, and their magnetic properties are discussed, introducing a simple electrochemical approach for the fabrication of nanodimensional alloys from mutually immiscible metals. Full article
(This article belongs to the Special Issue Nanosized and Nanostructured Magnetic Materials: Experimental, Theoretical, and Computational Investigations)
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