Special Issue "Novel RE-free Nanocomposite Magnets"

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Nanocomposite Materials".

Deadline for manuscript submissions: 31 December 2022 | Viewed by 996

Special Issue Editors

Dr. Alina Daniela Crişan
E-Mail Website
Guest Editor
National Institute for Materials Physics, 077125 Magurele, Romania
Interests: RE-free nanocomposite magnets; L10 magnets; structural phase stability
Dr. Ovidiu Crisan
E-Mail Website
Guest Editor
National Institute for Materials Physics, 077125 Magurele, Romania
Interests: magnetic nanomaterials; surface-functionalized nanoparticles; nanomagnetism; nanoelectronics
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The present Special Issue invites the submission of research papers on theoretical as well as experimental approaches toward conceiving and developing RE-free nanocomposite magnets. The motivation for editing this Special Issue is linked to the current needs for alternative solutions to the commonly employed magnetic materials.

Magnets and especially permanent magnets are widely used in most industrial technologies today—from domestic household to magnetic recording media, from the automotive to the aircraft industry, for renewable energy generation for wind turbine components. Industry demand for magnets is continuously growing with the increased emergence of autonomous and hybrid electric vehicles and wind turbines, new developments in the automation and robotics industry, new smartphones and telecom, as well as the potential use in a wide range of medical devices, for imaging, diagnostics, and therapy. This is why the research community has embarked on a quest for magnetic materials based on abundant elements which are less costly and easy to process, without trading off too much of the magnetic performances of rare earth magnets.

The present Special Issue will address all the challenges encountered in developing novel RE-free nanocomposite magnets, including but not limited to:

  • Theory and modeling of novel magnetic alloys compositions;
  • Synthesis challenges and microstructure optimization for novel nanocomposite magnets;
  • Magnetic phase coexistence and phase stability with temperature;
  • Hard–soft exchange coupling in multiphase magnetic nanocomposites;
  • Optimization of magnetic performances in RE-free nanocomposite magnets;
  • Trade-off between lowering costs and holding high enough magnetic performances;
  • Magnetic performances in extreme conditions of operation.

Dr. Alina Daniela Crişan
Dr. Ovidiu Crisan
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. Nanomaterials 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 2400 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

  • RE-free nanocomposite magnets
  • hard-soft exchange coupling
  • magnetic stability
  • structural phase transformation

Published Papers (2 papers)

Order results
Result details
Select all
Export citation of selected articles as:

Research

Article
Reverse Magnetization Behavior Investigation of Mn-Al-C-(α-Fe) Nanocomposite Alloys with Different α-Fe Content Using First-Order Reversal Curves Analysis
Nanomaterials 2022, 12(19), 3303; https://doi.org/10.3390/nano12193303 - 22 Sep 2022
Viewed by 268
Abstract
The reverse magnetization behavior for bulk composite alloys containing Mn-Al-C and α-Fe nanoparticles (NPs) has been investigated by hysteresis loops, recoil, and first-order reversal curves (FORC) analysis. The effect of adding different percentages of α-Fe (5, 10, 15, and 20 wt. %) on [...] Read more.
The reverse magnetization behavior for bulk composite alloys containing Mn-Al-C and α-Fe nanoparticles (NPs) has been investigated by hysteresis loops, recoil, and first-order reversal curves (FORC) analysis. The effect of adding different percentages of α-Fe (5, 10, 15, and 20 wt. %) on the magnetic properties and demagnetization behavior of Mn-Al-C nanostructured bulk magnets was investigated. The fabricated nanocomposites were characterized by XRD and VSM for structural analysis and magnetic behavior investigations, respectively. The demagnetization curve of the sample Mn-Al-C-5wt. % α-Fe showed a single hard magnetic behavior and showed the highest increase in remanence magnetization compared to the sample without α-Fe, and therefore this combination was selected as the optimal composition for FORC analysis. Magnetic properties for Mn-Al-C-5 wt. % α-Fe nanocomposite were obtained as Ms = 75 emu/g, Mr = 46 emu/g, Hc = 3.3 kOe, and (BH)max = 1.6 MGOe, indicating a much higher (BH)max than the sample with no α-Fe. FORC analysis was performed to identify exchange coupling for the Mn-Al-C-0.05α-Fe nanocomposite sample. The results of this analysis showed the presence of two soft and hard ferromagnetic components. Further, it showed that the reverse magnetization process in the composite sample containing 5 wt. % α-Fe is the domain rotation model. Full article
(This article belongs to the Special Issue Novel RE-free Nanocomposite Magnets)
Show Figures

Figure 1

Article
Change in Magnetic Anisotropy at the Surface and in the Bulk of FINEMET Induced by Swift Heavy Ion Irradiation
Nanomaterials 2022, 12(12), 1962; https://doi.org/10.3390/nano12121962 - 08 Jun 2022
Viewed by 487
Abstract
57Fe transmission and conversion electron Mössbauer spectroscopy as well as XRD were used to study the effect of swift heavy ion irradiation on stress-annealed FINEMET samples with a composition of Fe73.5Si13.5Nb3B9Cu1. The [...] Read more.
57Fe transmission and conversion electron Mössbauer spectroscopy as well as XRD were used to study the effect of swift heavy ion irradiation on stress-annealed FINEMET samples with a composition of Fe73.5Si13.5Nb3B9Cu1. The XRD of the samples indicated changes neither in the crystal structure nor in the texture of irradiated ribbons as compared to those of non-irradiated ones. However, changes in the magnetic anisotropy both in the bulk as well as at the surface of the FINEMET alloy ribbons irradiated by 160 MeV 132Xe ions with a fluence of 1013 ion cm−2 were revealed via the decrease in relative areas of the second and fifth lines of the magnetic sextets in the corresponding Mössbauer spectra. The irradiation-induced change in the magnetic anisotropy in the bulk was found to be similar or somewhat higher than that at the surface. The results are discussed in terms of the defects produced by irradiation and corresponding changes in the orientation of spins depending on the direction of the stress generated around these defects. Full article
(This article belongs to the Special Issue Novel RE-free Nanocomposite Magnets)
Show Figures

Graphical abstract

Planned Papers

The below list represents only planned manuscripts. Some of these manuscripts have not been received by the Editorial Office yet. Papers submitted to MDPI journals are subject to peer-review.

Title: Change in Magnetic Anisotropy at the Surface and in the Bulk of FINEMET induced by Swift Heavy Ion Irradiation
Authors: Ernő Kuzmann; Sándor Stichleutner; Libor Machala; Jiri Pechousek; Rene Vondrasek; David Smrcka; Lukas Kouril; Zoltán Homonnay; Michael I. Oshtrakh; András Mozzolai; Vladimir A. Skuratov; Mátyás Kudor; Bence Herczeg; Lajos Károly Varga
Affiliation: 1. Institute of Chemistry, Eötvös Loránd University, 1117, Budapest, Pázmány Péter sétány 1/A, Hungary 2. Centre for Energy Research, 1121 Budapest, Konkoly-Thege Miklós út 29-33, Hungary 3. Department of Experimental Physics, Faculty of Science, Palacký University Olomouc, 17.listopadu 1192/12, 771 46 Olomouc, Czech Republic 4. Department of Experimental Physics, Institute of Physics and Technology, Ural Federal University, Ekaterin-burg, 620002, Russian Federation 5. Flerov Laboratory of Nuclear Reactions, Joint Institute for Nuclear Research, JINR, Joliot-Curie 6, 141980, Dub-na, Moscow region, Russian Federation 6. National Research Nuclear University MEPhI, Kashirskoye sh., 31, 115409, Moscow, Russian Federation 7. Dubna State University, Universitetskaya 19, 141980, Dubna, Moscow Region, Russian Federation 8. Wigner Research Centre for Physics, 1121 Budapest, Konkoly Thege Miklós út 29-33, Hungary
Abstract: 57Fe transmission and conversion electron Mössbauer spectroscopy as well as XRD were used to study the effect of swift heavy ion irradiation on stress annealed FINEMET samples with compo-sition of Fe73.5Si13.5Nb3B9Cu1. XRD of the samples indicated no changes either in the crystal struc-ture or in the texture of irradiated ribbons compared to those of non-irradiated ones. However, changes in the magnetic anisotropy both in the bulk as well as at the surface of the FINEMET al-loy ribbons irradiated by 160 MeV 132Xe ions with a fluence of 1013 ion per cm–2 were revealed via the decrease in relative areas of the 2nd and the 5th lines of the magnetic sextets in the correspond-ing Mössbauer spectra. The change in the magnetic anisotropy in the bulk, which was induced by the irradiation, was found to be consistent with, but somewhat higher than that at the surface. The results are discussed in terms of the defects produced by irradiation and corresponding changes in the orientation of spins depending on the direction of stresses occurring around these defects. Highlights: - The swift heavy ion irradiation induces considerable changes in the orientation of magnetization, both in the bulk and at the surface of the FINEMET ribbons; - The orientation of magnetization after irradiation is significantly different in the bulk and at the surface;

Back to TopTop