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Nanomaterials
Special Issues
Magnetism of Metal and Metal-Oxide Nanoparticles
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Magnetism of Metal and Metal-Oxide Nanoparticles

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

Deadline for manuscript submissions: closed (31 January 2021) | Viewed by 6426

Special Issue Editors

Prof. Dr. Maria Luisa Fdez-Gubieda

E-Mail Website
Guest Editor
Universidad del País Vasco, Leioa, Spain
Interests: nanomagnetism; magnetic materials; magnetic nanostructures; synchrotron radiation techniques; magnetotactic bacteria; biomagnetism
Dr. Ana García Prieto

E-Mail Website
Guest Editor
Universidad del País Vasco, Leioa, Spain
Interests: nanomagnetism; magnetotactic bacteria; biomedical applications of magnetic nanostructures; x-ray absorption spectroscopy

Special Issue Information

Dear Colleagues,

Magnetic properties of materials change drastically as the size decreases to the nanoscale. Understanding the new magnetic phenomena arising at the nanoscale constitutes not only an exciting field of fundamental research, but also an essential step towards the potential applications of these nanoparticles in diverse fields, such as life sciences, data storage or energy applications.

This Special Issue of Nanomaterials is devoted to covering the recent advances on magnetic nanoparticles of metals and metal–oxide nanoparticles focused on potential biomedical applications. In this way, this issue will concern topics spanning from new preparation methods and characterization of magnetic nanoparticulate systems (e.g., magnetic fluids, nanoparticle-based architectures, bioinspired and biosynthesized magnetic nanoparticles, matrix-embedded nanoparticles) and the study of their associated magnetic phenomena (e.g., collective phenomena, relaxation processes, magnetic anisotropy), focused towards an understanding and optimized performance of the systems in biomedical uses (e.g., magnetic drug delivery, magnetic hyperthermia, magnetic particle imaging).

Prof. Dr. Maria Luisa Fdez-Gubieda
Dr. Ana García Prieto
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 2900 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

  • Characterization of magnetic nanoparticles
  • Nanoscale magnetism
  • Finite-size effects
  • Biomedical applications
  • Magnetic hyperthermia
  • Magnetic drug delivery
  • Magnetic particle imaging

Published Papers (2 papers)

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Research

16 pages, 2121 KiB  
Article
Investigating the Size and Microstrain Influence in the Magnetic Order/Disorder State of GdCu2 Nanoparticles
by E. M. Jefremovas, J. Alonso, M. de la Fuente Rodríguez, J. Rodríguez Fernández, J. I. Espeso, D. P. Rojas, A. García-Prieto, M. L. Fernández-Gubieda and L. Fernández Barquín
Nanomaterials 2020, 10(6), 1117; https://doi.org/10.3390/nano10061117 - 5 Jun 2020
Cited by 11 | Viewed by 2739
Abstract
A series of GdCu 2 nanoparticles with controlled sizes ranging from 7 nm to 40 nm has been produced via high-energy inert-gas ball milling. Rietveld refinements on the X-ray diffraction measurements ensure that the bulk crystalline I m m a structure is retained [...] Read more.
A series of GdCu 2 nanoparticles with controlled sizes ranging from 7 nm to 40 nm has been produced via high-energy inert-gas ball milling. Rietveld refinements on the X-ray diffraction measurements ensure that the bulk crystalline I m m a structure is retained within the nanoparticles, thanks to the employed low milling times ranging from t = 0.5 to t = 5 h. The analysis of the magnetic measurements shows a crossover from Superantiferromagnetism (SAF) to a Super Spin Glass state as the size decreases at NP size of ⟨ D ⟩ ≈ 18 nm. The microstrain contribution, which is always kept below 1%, together with the increasing surface-to-core ratio of the magnetic moments, trigger the magnetic disorder. Additionally, an extra contribution to the magnetic disorder is revealed within the SAF state, as the oscillating RKKY indirect exchange achieves to couple with the aforementioned contribution that emerges from the size reduction. The combination of both sources of disorder leads to a maximised frustration for ⟨ D ⟩ ≈ 25 nm sized NPs. Full article
(This article belongs to the Special Issue Magnetism of Metal and Metal-Oxide Nanoparticles)
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Graphical abstract

13 pages, 4502 KiB  
Article
Micromagnetic Simulations of Chaotic Ferromagnetic Nanofiber Networks
by Tomasz Blachowicz, Christoph Döpke and Andrea Ehrmann
Nanomaterials 2020, 10(4), 738; https://doi.org/10.3390/nano10040738 - 12 Apr 2020
Cited by 11 | Viewed by 3230
Abstract
Electrospinning can be used to create nanofibers with diameters of typically a few tens to a few hundred nanometers. While pure polymers are often electrospun, it is also possible to use polymer blends or to include nanoparticles. In this way, e.g., magnetic nanofiber [...] Read more.
Electrospinning can be used to create nanofibers with diameters of typically a few tens to a few hundred nanometers. While pure polymers are often electrospun, it is also possible to use polymer blends or to include nanoparticles. In this way, e.g., magnetic nanofiber networks can be created with a certain diameter distribution, random fiber orientations, and random crossing positions and angles. Here we present for the first time micromagnetic simulations of small parts of stochastically oriented nanofiber networks. Magnetization reversal mechanisms are investigated for different local spatial distributions; mutual influences of neighboring magnetic fibers due to dipolar interactions are depicted. This study serves as a base for the possible use of such stochastic nanofiber networks in the research area of neuro-inspired materials. Full article
(This article belongs to the Special Issue Magnetism of Metal and Metal-Oxide Nanoparticles)
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