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Nanomaterials
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Ferromagnetic, Ferroelectric, and Multiferroic Oxide Nanopowders, Nanoceramics, and Thin Films
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Ferromagnetic, Ferroelectric, and Multiferroic Oxide Nanopowders, Nanoceramics, and Thin Films

A special issue of Nanomaterials (ISSN 2079-4991).

Deadline for manuscript submissions: closed (31 March 2023) | Viewed by 4486

Special Issue Editor

Prof. Dr. Sergei Trukhanov

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Guest Editor
Scientific Practical Materials Research Centre of National Academy of Sciences of Belarus, Minsk, Belarus
Interests: chemistry and physics of complex transition metal alloys and oxides in micro-, meso-, and nanoforms; crystal and magnetic structures; phase transitions; magnetic state; colossal magnetoresistance; magnetoelectric effect; multiferroics; microwave absorption; microwave magnetodielectric materials for 5G technology; functional composite materials for microwave absorption
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Multiferroics, i.e., compounds and composites based on them, combining at least two ferroic long-range orders at the same time, attract close attention due to their important fundamental and practical significance. Such materials expand their scope due to the versatility of order control. For example, the magnetic and dielectric properties can be changed using the strain field. The magnetic and elastic properties can vary in an applied electric field. Furthermore, the dielectric and elastic properties can be subject to the influence of a magnetic field. The close interconnection of various spontaneous orders is unique and creates great prospects for the practical use of such materials. The most demanded are materials with the simultaneous presence of ferromagnetic and ferroelectric orders. Oxide compounds of multiferroics are most in demand because of their chemical resistance during domestic use, as this is operation in an oxidizing air atmosphere. Ferrites, complex oxides of iron cations with various crystal structures such as the structure of perovskite, spinel, garnet and magnetoplumbite, are the basic class of compounds for the search for room temperature multiferroics, since they most often have spontaneous long-range magnetic and dielectric orders. The production of iron oxide compounds in nanoform, such as nanopowders, nanoceramics and thin films, very often leads to the desired results due to the appropriate distortion of the unit cell and the appearance of conditions for the occurrence of spontaneous polarization. The combination of intense values of spontaneous magnetization and polarization in nanoscale iron oxide compounds is very promising from a practical point of view.

Prof. Dr. Sergei Trukhanov
Guest Editor

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Keywords

  • ferromagnets, ferroelectrics, ferroelastics, multiferroics
  • complex oxides of transition elements
  • nanopowders
  • nanoceramics
  • thin films
  • magnetic and dielectric properties
  • microwave absorption

Published Papers (3 papers)

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Research

21 pages, 5387 KiB  
Article
Impact of Nd3+ Substitutions on the Structure and Magnetic Properties of Nanostructured SrFe12O19 Hexaferrite
by Ashraf M. Semaida, Moustafa A. Darwish, Mohamed M. Salem, Di Zhou, Tatiana I. Zubar, Sergei V. Trukhanov, Alex V. Trukhanov, Vladimir P. Menushenkov and Alexander G. Savchenko
Nanomaterials 2022, 12(19), 3452; https://doi.org/10.3390/nano12193452 - 02 Oct 2022
Cited by 41 | Viewed by 2161
Abstract
In this study, SrFe12-xNdxO19, where x = 0, 0.1, 0.2, 0.3, 0.4, and 0.5, was prepared using high-energy ball milling. The prepared samples were characterized by X-ray diffraction (XRD). Using the XRD results, a comparative analysis of [...] Read more.
In this study, SrFe12-xNdxO19, where x = 0, 0.1, 0.2, 0.3, 0.4, and 0.5, was prepared using high-energy ball milling. The prepared samples were characterized by X-ray diffraction (XRD). Using the XRD results, a comparative analysis of crystallite sizes of the prepared powders was carried out by different methods (models) such as the Scherrer, Williamson–Hall (W–H), Halder–Wagner (H–W), and size-strain plot (SSP) method. All the studied methods prove that the average nanocrystallite size of the prepared samples increases by increasing the Nd concentration. The H–W and SSP methods are more accurate than the Scherer or W–H methods, suggesting that these methods are more suitable for analyzing the XRD spectra obtained in this study. The specific saturation magnetization (σs), the effective anisotropy constant (Keff), the field of magnetocrystalline anisotropy (Ha), and the field of shape anisotropy (Hd) for SrFe12-xNdxO19 (0 ≤ x ≤ 0.5) powders were calculated. The coercivity (Hc) increases (about 9% at x = 0.4) with an increasing degree of substitution of Fe3+ by Nd3+, which is one of the main parameters for manufacturing permanent magnets. Full article
(This article belongs to the Special Issue Ferromagnetic, Ferroelectric, and Multiferroic Oxide Nanopowders, Nanoceramics, and Thin Films)
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18 pages, 5127 KiB  
Article
Impact of Ga3+ Ions on the Structure, Magnetic, and Optical Features of Co-Ni Nanostructured Spinel Ferrite Microspheres
by Munirah A. Almessiere, Yassine Slimani, Sadaqat Ali, Abdulhadi Baykal, Rabindran Jermy Balasamy, Sadik Guner, İsmail A. Auwal, Alex V. Trukhanov, Sergei V. Trukhanov and Ayyar Manikandan
Nanomaterials 2022, 12(16), 2872; https://doi.org/10.3390/nano12162872 - 21 Aug 2022
Cited by 25 | Viewed by 1755
Abstract
Co-Ni ferrite is one of the crucial materials for the electronic industry. A partial substitution with a rare-earth metal brings about modification in crystal lattice and broadens knowledge in the discovery of new magnetic material. Current work reports a Ga3+ substitution in [...] Read more.
Co-Ni ferrite is one of the crucial materials for the electronic industry. A partial substitution with a rare-earth metal brings about modification in crystal lattice and broadens knowledge in the discovery of new magnetic material. Current work reports a Ga3+ substitution in the Co-Ni ferrite with composition Co0.5Ni0.5Fe2−xGaxO4 (where x = 0.0, 0.2, 0.4, 0.6, 0.8, and 1.0), herein referred to as spinel ferrite microspheres (CoNiGa-SFMCs). The samples were crystallized hydrothermally showing a hollow sphere morphology. The crystal phase, magnetic, morphology, and optical behaviour were examined using various microscopy and spectroscopic tools. While the XRD confirmed the phase of SFMCs, the crystallite size varied between 9 and 12 nm. The Tauc plot obtained from DRS (diffuse reflectance spectroscopy) shows the direct optical energy bandgap (Eg) of the products, with the pristine reading having the value of 1.41 eV Eg; the band gap increased almost linearly up to 1.62 eV along with rising the Ga3+ amount. The magnetic features, on the other hand, indicated the decrease in coercivity (Hc) as more Ga3+ is introduced. Moreover, there was a gradual increase in both saturation magnetization (Ms) and magnetic moment (nB) with increasing amount of Ga3+ till x = 0.6 and then a progressive decline with increases in the x content; this was ascribed to the spin-glass-like behavior at low temperatures. It was detected that magnetic properties correlate well with crystallite/particle size, cation distribution, and anisotropy. Full article
(This article belongs to the Special Issue Ferromagnetic, Ferroelectric, and Multiferroic Oxide Nanopowders, Nanoceramics, and Thin Films)
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18 pages, 9705 KiB  
Article
Combined Effect of Microstructure, Surface Energy, and Adhesion Force on the Friction of PVA/Ferrite Spinel Nanocomposites
by Moustafa A. Darwish, Tatiana I. Zubar, Oleg D. Kanafyev, Di Zhou, Ekaterina L. Trukhanova, Sergei V. Trukhanov, Alex V. Trukhanov and Ahmed Maher Henaish
Nanomaterials 2022, 12(12), 1998; https://doi.org/10.3390/nano12121998 - 10 Jun 2022
Cited by 44 | Viewed by 2000
Abstract
Nanocomposite films based on spinel ferrite (Mg0.8Zn0.2Fe1.5Al0.5O4) in a PVA matrix were obtained. An increase in the spinel concentration to 10 wt.% caused an avalanche-like rise in roughness due to the formation of [...] Read more.
Nanocomposite films based on spinel ferrite (Mg0.8Zn0.2Fe1.5Al0.5O4) in a PVA matrix were obtained. An increase in the spinel concentration to 10 wt.% caused an avalanche-like rise in roughness due to the formation of nanoparticle agglomerates. The lateral mode of atomic force microscopy (AFM) allowed us to trace the agglomeration dynamics. An unexpected result was that the composite with 6 wt.% of filler had a low friction coefficient in comparison with similar composites due to the successfully combined effects of low roughness and surface energy. The friction coefficient decreased to 0.07 when the friction coefficient of pure PVA was 0.72. A specially developed method for measuring nano-objects’ surface energy using AFM made it possible to explain the anomalous nature of the change in tribological characteristics. Full article
(This article belongs to the Special Issue Ferromagnetic, Ferroelectric, and Multiferroic Oxide Nanopowders, Nanoceramics, and Thin Films)
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