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Research in Structural and Magnetic Properties of Ferromagnetic Materials
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Research in Structural and Magnetic Properties of Ferromagnetic Materials

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Materials Physics".

Deadline for manuscript submissions: closed (20 February 2022) | Viewed by 4686

Special Issue Editor

Dr. Tatyana Koutzarova

E-Mail Website
Guest Editor
Institute of Electronics Bulgarian Academy of Sciences, Sofia, Bulgaria
Interests: magnetic materials; nanosized ferrites; multiferoic materials; magnetic composites; microwave absorbers
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Ferromagnetic materials are among the most important classes of magnetic materials. Because of the wide field of their potential applications, they have been studied intensively for many years. With the advent of nanotechnologies, researchers’ interest in their specific magnetic properties as related to the nanodimensions has grown considerably in view of finding novel applications in nanoelectronics, spintronics, communication technologies, biomedicine, theranostics, sensorics, and catalysis, to name but a few. In recent years, a sizable part of studies have been focused on observing the magnetoelectric effect, particularly in some ferrites, and clarifying the phenomenon of multiferroism. This Special Issue aims to present recent advances in the synthesis and investigation of the structural and magnetic properties of ferromagnetic materials, especially in the large and important class of ferrite materials. Special attention will be given to novel trends in the techniques of synthesis and to revealing new properties and finding new applications. Reports are welcomed on new results concerning the structural and magnetic properties of different types of ferromagnetic materials in powder and bulk form, or as composites and thin or thick films. The Special Issue is open to articles (reviews or original manuscripts) dealing with experimental and theoretical research on ferromagnetic materials.

Dr. Tatyana Koutzarova
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. 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


  • Ferromagnetic materials
  • Ferrites
  • Powders, bulk, composites, thin and thick films
  • Structural analysis
  • Magnetic structure
  • Phase transitions in ferrites
  • Magnetoelectric effect
  • Magnetic properties
  • Microwave properties

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Published Papers (2 papers)

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Research

14 pages, 2129 KiB  
Article
Evolution of Structural and Magnetic Properties of Fe-Co Wire-like Nanochains Caused by Annealing Atmosphere
by Marcin Krajewski, Mateusz Tokarczyk, Sabina Lewińska, Katarzyna Brzózka, Kamil Bochenek and Anna Ślawska-Waniewska
Materials 2021, 14(16), 4748; https://doi.org/10.3390/ma14164748 - 23 Aug 2021
Cited by 1 | Viewed by 2100
Abstract
Thermal treatment is a post-synthesis treatment that aims to improve the crystallinity and interrelated physical properties of as-prepared materials. This process may also cause some unwanted changes in materials like their oxidation or contamination. In this work, we present the post-synthesis annealing treatments [...] Read more.
Thermal treatment is a post-synthesis treatment that aims to improve the crystallinity and interrelated physical properties of as-prepared materials. This process may also cause some unwanted changes in materials like their oxidation or contamination. In this work, we present the post-synthesis annealing treatments of the amorphous Fe1−xCox (x = 0.25; 0.50; 0.75) Wire-like nanochains performed at 400 °C in two different atmospheres, i.e., a mixture of 80% nitrogen and 20% hydrogen and argon. These processes caused significantly different changes of structural and magnetic properties of the initially-formed Fe-Co nanostructures. All of them crystallized and their cores were composed of body-centered cubic Fe-Co phase, whereas their oxide shells comprised of a mixture of CoFe2O4 and Fe3O4 phases. However, the annealing carried out in hydrogen-containing atmosphere caused a decomposition of the initial oxide shell layer, whereas a similar process in argon led to its slight thickening. Moreover, it was found that the cores of thermally-treated Fe0.25Co0.75 nanochains contained the hexagonal closest packed (hcp) Co phase and were covered by the nanosheet-like shell layer in the case of annealing performed in argon. Considering the evolution of magnetic properties induced by structural changes, it was observed that the coercivities of annealed Fe-Co nanochains increased in comparison with their non-annealed counterparts. The saturation magnetization (MS) of the Fe0.25Co0.75 nanomaterial annealed in both atmospheres was higher than that for the non-annealed sample. In turn, the MS of the Fe0.75Co0.25 and Fe0.50Co0.50 nanochains annealed in argon were lower than those recorded for non-annealed samples due to their partial oxidation during thermal processing. Full article
(This article belongs to the Special Issue Research in Structural and Magnetic Properties of Ferromagnetic Materials)
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14 pages, 24839 KiB  
Article
The Effect of the In-Situ Heat Treatment on the Martensitic Transformation and Specific Properties of the Fe-Mn-Si-Cr Shape Memory Alloys Processed by HSHPT Severe Plastic Deformation
by Carmela Gurau, Gheorghe Gurau, Felicia Tolea, Bogdan Popescu, Mihaela Banu and Leandru-Gheorghe Bujoreanu
Materials 2021, 14(16), 4621; https://doi.org/10.3390/ma14164621 - 17 Aug 2021
Cited by 5 | Viewed by 1851
Abstract
This work focuses on the temperature evolution of the martensitic phase ε (hexagonal close packed) induced by the severe plastic deformation via High Speed High Pressure Torsion method in Fe57Mn27Si11Cr5 (at %) alloy. The iron rich [...] Read more.
This work focuses on the temperature evolution of the martensitic phase ε (hexagonal close packed) induced by the severe plastic deformation via High Speed High Pressure Torsion method in Fe57Mn27Si11Cr5 (at %) alloy. The iron rich alloy crystalline structure, magnetic and transport properties were investigated on samples subjected to room temperature High Speed High Pressure Torsion incorporating 1.86 degree of deformation and also hot-compression. Thermo-resistivity as well as thermomagnetic measurements indicate an antiferromagnetic behavior with the Néel temperature (TN) around 244 K, directly related to the austenitic γ-phase. The sudden increase of the resistivity on cooling below the Néel temperature can be explained by an increased phonon-electron interaction. In-situ magnetic and electric transport measurements up to 900 K are equivalent to thermal treatments and lead to the appearance of the bcc-ferrite-like type phase, to the detriment of the ε(hcp) martensite and the γ (fcc) austenite phases. Full article
(This article belongs to the Special Issue Research in Structural and Magnetic Properties of Ferromagnetic Materials)
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