Functional Magnetic Nanomaterials and Nanostructures: Properties and Applications

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

Deadline for manuscript submissions: 31 August 2024 | Viewed by 1672

Special Issue Editors


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Guest Editor
Kirensky Institute of Physics, FRC KSC SB RAS, 660036 Krasnoyarsk, Siberian Federal University, Krasnoyarsk 660041, Russia
Interests: magnetism; nanomaterials; SPIONs; mössbauer spectroscopy

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Guest Editor
Kirensky Institute of Physics, Federal Research Center KSC SB RAS, Krasnoyarsk, Russia
Interests: magnetic materials; interfacial magnetism; interplay between structure and magnetism; local structure; phase transitions; strong correlated electron systems; X-ray absorption fine structure; X-ray dichroism techniques
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Special Issue Information

Dear Colleagues,

The development of modern experimental techniques, especially synchrotron techniques (SAXS, X-ray imaging, XMCD), has allowed scientists to obtain new knowledge concerning the nanostructure and morphology of nano-objects, as well as their physico-chemical properties. The development of our understanding of the origin of properties of nanomaterials is significantly expanding the possible application of such materials. Currently, the use of magnetic nanomaterials has become vital due to, for instance, their high catalytic, sorption activities, and attractive magnetic characteristics. However, the precise investigation of prospective nanomaterials is strictly indispensable, as it may enable the precise tuning of the properties of nanomaterials for precise exploitation methods. This Special Issue welcomes submissions from researchers who study the fundamental origin of the properties of functional nanomaterials and studies exploring their wide area of application.

We hope that this Special Issue of the open access journal Magnetochemistry presents a platform to investigate modern synthesis methods, investigation tools, and new prospective applications of functional nanomaterials.

Dr. Yuriy V. Knyazev
Dr. Mikhail Platunov
Guest Editors

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Keywords

  • magnetic materials
  • interfacial magnetism
  • interplay between structure and magnetism
  • local structure
  • phase transitions
  • strong correlated electron systems
  • X-ray absorption fine structure
  • X-ray dichroism technique

Published Papers (1 paper)

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Research

16 pages, 2922 KiB  
Article
Experimental Investigations on the Ferromagnetic Resonance and Absorbing Properties of a Ferrofluid in the Microwave Range
by Iosif Malaescu, Catalin N. Marin and Paul C. Fannin
Magnetochemistry 2024, 10(2), 7; https://doi.org/10.3390/magnetochemistry10020007 - 26 Jan 2024
Viewed by 1454
Abstract
Measurements of complex magnetic permeability, μ(f,H) = μ′(f,H) − ″(f,H) and dielectric permittivity ε(f,H) = ε′(f,H) − [...] Read more.
Measurements of complex magnetic permeability, μ(f,H) = μ′(f,H) − ″(f,H) and dielectric permittivity ε(f,H) = ε′(f,H) − ″(f,H), in the frequency range, f of (0.4–7) GHz, and polarizing field, H of (0–135) kA/m, were performed, for a kerosene-based ferrofluid with magnetite nanoparticles. Based on these measurements, the phenomenon of ferromagnetic resonance was highlighted and some microwave propagation parameters of the ferrofluid were determined: the attenuation constant, α(f,H), and the reflection coefficient, R(f,H), at the air-material interface, at the normal incidence. Knowing these parameters we proposed a theoretical model establishing for the first time an equation that allows the calculation of the overall reflection coefficient, Rw(f,H), at the normal incidence of the wave, for a ferrofluid of thickness d, deposited on a totally reflective support, following multiple internal reflections of the electromagnetic wave in the material. The results show that by increasing both, H, and d, the parameter, Rw(f,H) presents a minimum that decreases from 0.90 (for d = 2 mm) to 0.64 (for d = 10 mm), at frequency f = 5 GHz, which indicates an increase in the absorption of the electromagnetic wave by the ferrofluid. The obtained results are useful in the study of some materials that could be used as electromagnetic absorbers in the microwave range, by the determination of the overall reflection coefficient, Rw(f,H), controlled both by the thickness, d, of the absorber and by the external applied field, H. Full article
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