Special Issue "Magnetic Materials, Thin Film and Nanostructures"

A special issue of Magnetochemistry (ISSN 2312-7481). This special issue belongs to the section "Magnetic Materials".

Deadline for manuscript submissions: 1 April 2023 | Viewed by 6253

Special Issue Editors

Dr. Cătălin-Daniel Constantinescu
E-Mail Website
Guest Editor
LP3/UMR, CNRS 7341, Marseille, France
Interests: magnetic materials; materials chemistry & physics; laser & plasma processing; thin films and nanostructures; planar transformers
Special Issues, Collections and Topics in MDPI journals
Dr. Lucian Petrescu
E-Mail Website
Guest Editor
Department of Electrotehnics, Faculty of Electrical Engineering, “Politehnica” University of Bucharest, RO-061071 Bucharest, Romania
Interests: magnetic materials; magnetic hysteresis; electromagnetic field computation; planar transformers; power transformers.

Special Issue Information

Dear Colleagues,

In this Special Issue, the aim is to cover all relevant aspects of chemical and physical processes of the production and characterization of magnetic materials in bulk, thin films, nanostructures and/or nanocomposites, as well as modeling aspects involving such structures.

Accordingly, this Special Issue welcomes original research and review manuscripts on the challenges and trends covering fundamental and experimental research—with special focus on the design, synthesis, and characterization of any type of magnetic material and the study of its structure/property relationships. We also welcome manuscripts on the development of new experimental concepts, to the transfer, chemical transformation, high-resolution patterning of advanced thin films and nanomaterials, to the design and fabrication of devices.

Dr. Cǎtǎlin Constantinescu
Dr. Lucian Petrescu
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. Magnetochemistry 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 1800 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

  • engineering/processing of magnetic materials, nanomaterials/nanostructures and thin films
  • characterization of magnetic materials, nanomaterials/nanostructures and thin films
  • theoretical models and calculations of magnetic materials
  • applications of magnetic materials

Published Papers (7 papers)

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Research

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Article
Size and Ion-Doping Effects on Magnetic, Optical, and Phonon Properties of CuAlO2 Nanoparticles
Magnetochemistry 2022, 8(12), 169; https://doi.org/10.3390/magnetochemistry8120169 - 25 Nov 2022
Viewed by 176
Abstract
The magnetic, optical, and phonon properties of ion-doped CuAlO2 nanoparticles on the Cu or Al site are theoretically investigated. The room temperature ferromagnetism in CuAlO2 nanoparticles can be due to the surface, size, and doping effects. The magnetization increases with the [...] Read more.
The magnetic, optical, and phonon properties of ion-doped CuAlO2 nanoparticles on the Cu or Al site are theoretically investigated. The room temperature ferromagnetism in CuAlO2 nanoparticles can be due to the surface, size, and doping effects. The magnetization increases with the decreasing nanoparticle size. The different radii of the transition metal ion and the host Cu ion lead to compressive strain, to the enhancment of the exchange interaction constants, and to increased magnetization Ms and Curie temperature TC. By substitution with Mn or Cr on the Al site, tensile strain, a decrease in Ms, and an increase in dopants are observed. The size and ion-doping influence on the band-gap energy is also discussed. The phonon energy ω decreases, whereas the phonon damping γ increases with increasing temperature and decreasing NP size. They show a kink around TC ∼ 400 K. The behavior of ω and γ for different ion dopings is observed. Full article
(This article belongs to the Special Issue Magnetic Materials, Thin Film and Nanostructures)
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Article
Mesostructure and Magnetic Properties of SiO2-Co Granular Film on Silicon Substrate
Magnetochemistry 2022, 8(12), 167; https://doi.org/10.3390/magnetochemistry8120167 - 24 Nov 2022
Viewed by 131
Abstract
Granular films SiO2(Co) exhibit unusual magnetic and magnetotransport properties which are strongly dependent on the composition of the film and material of a substrate. For example, the injection magnetoresistance (IMR) coefficient reaches a giant (GIMR) value of 105% at [...] Read more.
Granular films SiO2(Co) exhibit unusual magnetic and magnetotransport properties which are strongly dependent on the composition of the film and material of a substrate. For example, the injection magnetoresistance (IMR) coefficient reaches a giant (GIMR) value of 105% at room temperature in SiO2(Co) films on an n-GaAs substrate. However, the IMR effect is negligible in the case of a similar granular film deposited on the n-Si substrate. In this report, the structural and magnetic properties of granular film SiO2(Co) on Si substrate are studied with the aim to understand the cause of the difference in IMR coefficients for SiO2(Co) thin film deposited on n-GaAs and on n-Si substrates. Investigations were carried out using complementary methods of Polarized Neutron Reflectometry, Grazing Incidence Small-Angle X-ray Scattering, X-ray Reflectometry, Scanning Electron Microscope, and SQUID magnetometry. It is shown that the interface layer between the granular film and Si substrate exhibits metallic rather than magnetic properties and eliminates the GIMR effect. This interface layer is associated with the Si diffusion to Co nanoparticles and the formation of the metallic cobalt silicides. Full article
(This article belongs to the Special Issue Magnetic Materials, Thin Film and Nanostructures)
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Article
Role of Disordered Precursor in L10 Phase Formation in FePt-Based Nanocomposite Magnet
Magnetochemistry 2021, 7(11), 149; https://doi.org/10.3390/magnetochemistry7110149 - 14 Nov 2021
Viewed by 885
Abstract
In order to prove the usefulness of having a structurally disordered precursor to the formation of FePt L10 phase and to facilitate the co-existence of exchange coupled hard and soft magnetic phases with optimized magnetic properties in various conditions of annealing, a [...] Read more.
In order to prove the usefulness of having a structurally disordered precursor to the formation of FePt L10 phase and to facilitate the co-existence of exchange coupled hard and soft magnetic phases with optimized magnetic properties in various conditions of annealing, a Fe-Pt-Zr-B melt spun alloy has been synthesized and detailed structural and magnetic investigations have been undertaken to probe its phase evolution during annealing. The dynamics of formation of the hard magnetic L10 phase during the gradual disorder–order phase transformation has been monitored by using a complex combination of X-ray diffraction methods and 57Fe Mössbauer spectroscopy methods, over a wide range of annealing temperatures. Multiple phases co-existing in the annealed sample microstructures, observed in XRD, have been reconfirmed by the Mössbauer spectra analysis and, moreover, accurate quantitative data have been acquired in what concerns the relative abundance of each of the observed crystalline phases in every stage of annealing. It is shown that the formation of the hard magnetic phase, emerging from the chemically disordered precursor, is gradual and occurs via complex mechanisms, involving the presence of a disordered Fe-Zr-B-rich intergranular region which contributes to an increase in the abundance of the L10 phase for higher annealing temperatures. Magnetic measurements have confirmed the good performances of these alloys in terms of coercivity and remanence. These results contribute to the development of these alloys as the next generation of rare earth, free permanent magnets. Full article
(This article belongs to the Special Issue Magnetic Materials, Thin Film and Nanostructures)
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Article
Feasibility Study of Cooling a Bulk Acoustic Wave Resonator by Nanoparticle Enhanced Phase Change Material
Magnetochemistry 2021, 7(11), 144; https://doi.org/10.3390/magnetochemistry7110144 - 28 Oct 2021
Viewed by 927
Abstract
In the current study, the coupling of a cooling problem with the electromagnetic resonance of a bulk acoustic wave (BAW) material is investigated. As well, a new cooling method by the addition of nanoparticles to a phase change material surrounding the BAW resonator [...] Read more.
In the current study, the coupling of a cooling problem with the electromagnetic resonance of a bulk acoustic wave (BAW) material is investigated. As well, a new cooling method by the addition of nanoparticles to a phase change material surrounding the BAW resonator is presented. To solve the governing equations of piezoelectric charge and momentum balance, thermal balance, and fluid flow a code with the method of finite element is introduced. After validation of various features of the code with melting profile, heat generation, charge curve, and dispersion curve with benchmarks, the eigenfrequency analysis of the system is done. The thermal behavior of the system at first mode and various boundary conditions are studied. As well, the effect of nanoparticles in fastening the cooling of the BAW resonator is demonstrated. Full article
(This article belongs to the Special Issue Magnetic Materials, Thin Film and Nanostructures)
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Article
AC Susceptibility Studies of Magnetic Relaxation in Mn12-Stearate SMMs on the Spherical Silica Surface
Magnetochemistry 2021, 7(9), 122; https://doi.org/10.3390/magnetochemistry7090122 - 08 Sep 2021
Cited by 1 | Viewed by 761
Abstract
The study of magnetic relaxations in Mn12-stearate single-molecule magnets deposited on the surface of spherical silica nanoparticles was performed. For such a purpose, the investigation of AC magnetic susceptibility dependence on the frequency and temperature was performed. Based on the Argand [...] Read more.
The study of magnetic relaxations in Mn12-stearate single-molecule magnets deposited on the surface of spherical silica nanoparticles was performed. For such a purpose, the investigation of AC magnetic susceptibility dependence on the frequency and temperature was performed. Based on the Argand plots obtained for different temperatures and temperature dependencies of susceptibility, obtained for different frequencies of AC field, the corresponding relaxation times were derived. Fitting to the Arrhenius law revealed the values of an effective energy barrier and a mean relaxation time, which were consistent for both measuring techniques (Ueff/kB 50 K and τ0 107 s) and similar to the corresponding values for the analogous bulk compounds. Additionally, the obtained relaxation parameters for the Mn12-stearate molecules on the spherical silica surface were compared with corresponding values for the Mn12-based single-molecule magnets deposited upon other types of nanostructured silica surface. Full article
(This article belongs to the Special Issue Magnetic Materials, Thin Film and Nanostructures)
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Article
Electric Field Control of Magnetic Properties by Means of Li+ Migration in FeRh Thin Film
Magnetochemistry 2021, 7(4), 45; https://doi.org/10.3390/magnetochemistry7040045 - 26 Mar 2021
Viewed by 840
Abstract
Recently, the electric control of magnetism by means of ion migration has been proven to be effective with nonvolatility and low energy consumption. In this work, we investigated the control of the magnetic properties of FeRh films by means of Li+ migration [...] Read more.
Recently, the electric control of magnetism by means of ion migration has been proven to be effective with nonvolatility and low energy consumption. In this work, we investigated the control of the magnetic properties of FeRh films by means of Li+ migration in FeRh/MgO heterostructures. We found that the migration of Li+ could reduce the phase transition temperature by 2 K with an applied voltage of 1 V. Meanwhile, the voltage-dependent saturated magnetization exhibited a repetitive switching behavior from high to low magnetization values while the voltage was switched from 4 to −4 V, indicating that the migration of Li+ in the FeRh film can be reversible. This provides a means to control the magnetic properties of FeRh films. Full article
(This article belongs to the Special Issue Magnetic Materials, Thin Film and Nanostructures)
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Review

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Review
Review of Magnetic Shape Memory Polymers and Magnetic Soft Materials
Magnetochemistry 2021, 7(9), 123; https://doi.org/10.3390/magnetochemistry7090123 - 09 Sep 2021
Cited by 3 | Viewed by 1624
Abstract
Magnetic soft materials (MSMs) and magnetic shape memory polymers (MSMPs) have been some of the most intensely investigated newly developed material types in the last decade, thanks to the great and versatile potential of their innovative characteristic behaviors such as remote and nearly [...] Read more.
Magnetic soft materials (MSMs) and magnetic shape memory polymers (MSMPs) have been some of the most intensely investigated newly developed material types in the last decade, thanks to the great and versatile potential of their innovative characteristic behaviors such as remote and nearly heatless shape transformation in the case of MSMs. With regard to a number of properties such as shape recovery ratio, manufacturability, cost or programming potential, MSMs and MSMPs may exceed conventional shape memory materials such as shape memory alloys or shape memory polymers. Nevertheless, MSMs and MSMPs have not yet fully touched their scientific-industrial potential, basically due to the lack of detailed knowledge on various aspects of their constitutive response. Therefore, MSMs and MSMPs have been developed slowly but their importance will undoubtedly increase in the near future. This review emphasizes the development of MSMs and MSMPs with a specific focus on the role of the magnetic particles which affect the shape memory recovery and programming behavior of these materials. In addition, the synthesis and application of these materials are addressed. Full article
(This article belongs to the Special Issue Magnetic Materials, Thin Film and Nanostructures)
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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: Application of external magnetic field as a useful tool for tailoring the properties of electrodeposited materials
Authors: Dawid Kutyla
Affiliation: UST AGH University of Science and Technology in Krakow Faculty of Non-Ferrous Metals
Abstract: Application of external magnetic field as a useful tool for tailoring the properties of electrodeposited materials

Title: Electrodeposition of Co-Pd alloys under different flux intensity and orientation of the applied magnetic field
Authors: Dawid Kutyła; Sylwia Banbur-Pawłowska; Piotr Żabiński
Affiliation: UST AGH University of Science and Technology in Krakow Faculty of Non-Ferrous Metals

Title: Magneto-Structural Transition State Searching in Antiferromagnets
Authors: Robert Lawrence; Matt Probert
Affiliation: University of York, UK

Title: Magnetic properties of polycrystalline BaM materials with different magnetic texturing grades manufactured by controled topotactical reaction
Authors: A. Hoez, J.-L. Mattei; A. Chevalier
Affiliation: Lab-STICC, UMR CNRS 6285, 6 av. Le Gorgeu, 29238 Brest, France

Title: Electrically Detected Magnetic Resonance on a Chip (EDMRoC) for operando defect analysis in silicon solar cell devices
Authors: Michele Segantini; Denis Djekic; Gianluca Marcozzi; Anh Chu; Joseph E. McPeak; Jens Anders; Boris Naydenov; Klaus Lips
Affiliation: Berlin Joint EPR laboratory and EPR4Energy, Department Spins in Energy Conversion and Quantum Information Science (ASPIN), Helmholtz-Zentrum Berlin für Materialien un Energie GmbH, Hahn-Meitner-Platz 1, 14109 Berlin, Germany; Institute of Smart Sensors, Universität Stuttgart, 70569 Stuttgart, Germany; Center for Integrated Quantum Science and Technology (IQST), Stuttgart and Ulm, Germany; Institute for Microelectronic Stuttgart, IMS CHIPS, Stuttgart, Germany; Berlin Joint EPR Laboratory, Fachbereich Physik, Freie Universität Berlin, 14195 Berlin, Germany

Title: Measurement Method of the Shielding effectiveness of Planar nanomaterial Samples up to 18 GHz
Authors: Andrea Amaro Perez; Adrian Suarez; Jose Torres; Pedro A. Martinez; Roberto Herraiz; Victor Solera; Abraham Menendez; Jorge Victoria; Begoña Galindo; Rocio Ruiz
Affiliation: Universitat de Valènciadisabled, Valencia, Spain .etc

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