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Crystals
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Exploring the Magnetic World: Advances in Synthesis, Characterization, and Revolutionary...
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Exploring the Magnetic World: Advances in Synthesis, Characterization, and Revolutionary Applications of Magnetic Nanoparticles

A special issue of Crystals (ISSN 2073-4352). This special issue belongs to the section "Inorganic Crystalline Materials".

Deadline for manuscript submissions: closed (20 April 2025) | Viewed by 4424

Special Issue Editors

Dr. Rajni Verma

E-Mail Website
Guest Editor
Nanospinic Laboratory, Research Institute of Advanced Materials, Department of Materials Science and Engineering, Seoul National University, Seoul 151-744, Republic of Korea
Interests: nanomaterials; biomaterials such as protein and peptides; optical imaging; nano-biointerface; fluorescence; microscopy
Special Issues, Collections and Topics in MDPI journals
Dr. Saurabh Pathak

E-Mail Website
Guest Editor
Department of Materials Science and Engineering, Seoul National University, Seoul, Republic of Korea
Interests: magnetic nanoparticles; energy; mechanical engineering; structural modeling; sensors; spin dynamics
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The Special Issue aims to showcase the latest research and developments in the field of nanomagnetism. This multidisciplinary field encompasses the synthesis, characterization, and utilization of magnetic nanoparticles with diverse applications spanning medicine, electronics, energy, and more. The Special Issue will provide a platform for researchers to share their cutting-edge work, foster collaborations, and promote further advancements in this exciting area of study.

In recent years, the field of nanomagnetism has witnessed remarkable progress, driven by advances in materials science, nanotechnology, and characterization techniques. Magnetic nanoparticles, with their unique properties at the nanoscale, have garnered significant attention due to their potential for revolutionizing various fields. These nanoparticles exhibit magnetic behavior that differs from their bulk counterparts, enabling them to exhibit enhanced magnetic properties, tunability, and diverse functionalities. They offer immense potential for applications such as targeted drug delivery, magnetic data storage, biosensors, catalysis, and spintronics.

This Special Issue will encompass a wide range of topics, including innovative synthesis methods, cutting-edge characterization techniques, and emerging applications of magnetic nanoparticles. We welcome various types of contributions, including original research articles, insightful review articles, and forward-thinking perspective pieces. This Special Issue intends to foster collaboration and knowledge exchange among researchers working in different disciplines to further propel the field of nanomagnetism and unlock its tremendous potential in various scientific and technological domains.

Dr. Rajni Verma
Dr. Saurabh Pathak
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. Crystals 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 2100 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

  • nanomagnetism
  • magnetic nanoparticles
  • synthesis methods
  • characterization techniques
  • magnetic properties
  • biomedical applications
  • electronics
  • spintronics
  • energy applications
  • functionalization

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Published Papers (2 papers)

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Research

12 pages, 3883 KiB  
Article
Tuning the Superspin Dynamics in Inverse Spinel Ferrite Nanoparticle Ensembles via Indirect Cation Substitution
by Cristian E. Botez and Alex D. Price
Crystals 2024, 14(7), 580; https://doi.org/10.3390/cryst14070580 - 22 Jun 2024
Viewed by 1186
Abstract
We used magnetic and synchrotron X-ray diffraction measurements to investigate the possibility of tuning the strength of magnetic interparticle interactions in nanoparticle ensembles via chemical manipulation. Our main result comes from temperature-resolved in-phase ac-susceptibility data collected on 8 nm average-diameter Ni0.25Zn [...] Read more.
We used magnetic and synchrotron X-ray diffraction measurements to investigate the possibility of tuning the strength of magnetic interparticle interactions in nanoparticle ensembles via chemical manipulation. Our main result comes from temperature-resolved in-phase ac-susceptibility data collected on 8 nm average-diameter Ni0.25Zn0.75Fe2O4 (Ni25) and Ni0.5Zn0.5Fe2O4 (Ni50) nanoparticles at different frequencies, χ′ vs. T|f. We found that the relative peak temperature variation per frequency decade, ϕ=∆TT·∆log(f)—a known measure of interparticle interaction strength—exhibits a four-fold increase, from ϕ = 0.04 in Ni50 to ϕ = 0.16 in Ni25. This corresponds to a fundamental change in the nanoparticles’ superspin dynamics, as proven by the fit of phenomenological models to magnetic relaxation data. Indeed, the Ni25 ensemble exhibits superparamagnetic behavior, where the temperature dependence of the superspin relaxation time, τ, is described in the Dorman–Bessais–Fiorani (DBF) model: τT=τrexp⁡EB+EadkBT,  with parameters τr = 4 × 10−12 s, and (EB + Ead)/kB = 1473 K. On the other hand, the nanoparticles in the Ni50 ensemble freeze collectively upon cooling in a spin-glass fashion according to a critical dynamics law: τ(T)=τ0TTg−1zν, with τ0 = 4 × 10−8 s, Tg = 145 K, and zν = 7.2. Rietveld refinements against powder X-ray diffraction data reveal the structural details that underlie the observed magnetic behavior: an indirect cation replacement mechanism by which non-magnetic Zn ions are incorporated in the tetrahedral sites of the inverse spinel. Full article
(This article belongs to the Special Issue Exploring the Magnetic World: Advances in Synthesis, Characterization, and Revolutionary Applications of Magnetic Nanoparticles)
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8 pages, 2227 KiB  
Article
Innovative Method for the Mass Preparation of α″-Fe16N2 Powders via Gas Atomization
by Marian Grigoras, Mihaela Lostun, Marieta Porcescu, George Stoian, Gabriel Ababei and Nicoleta Lupu
Crystals 2023, 13(11), 1578; https://doi.org/10.3390/cryst13111578 - 9 Nov 2023
Cited by 3 | Viewed by 2489
Abstract
The iron nitride materials, especially α″-Fe16N2, are considered one of the most promising candidates for future rare-earth-free magnets. However, the mass production of α″-Fe16N2 powders as a raw material for permanent magnets is still challenging. In [...] Read more.
The iron nitride materials, especially α″-Fe16N2, are considered one of the most promising candidates for future rare-earth-free magnets. However, the mass production of α″-Fe16N2 powders as a raw material for permanent magnets is still challenging. In this work, starting from iron lumps as a raw material, we have managed to prepare the α″-Fe16N2 powders via the gas atomization method, followed by subsequent nitriding in an ammonia–hydrogen gas mixture stream. The particle size was controlled by changing the gas atomization preparation conditions. X-ray diffractograms (XRD) analyses show that the prepared powders are composed of α″-Fe16N2 and α-Fe phases. The α″-Fe16N2 volume ratio increases with decreasing powder size and increasing nitriding time, reaching a maximum of 57% α″-Fe16N2 phase in powders with size below 32 ± 3 μm after 96 h nitridation. The saturation magnetization reaches the value of 237 emu/g and a reasonable coercivity value of 884 Oe. Compared to the saturation magnetization values of α-Fe powders, the α″-Fe16N2 powders prepared through our proposed approach show an increase of up to 10% in saturation and demonstrate the possibility of mass production of α″-Fe16N2 powders as precursors of permanent magnets without rare earths. Full article
(This article belongs to the Special Issue Exploring the Magnetic World: Advances in Synthesis, Characterization, and Revolutionary Applications of Magnetic Nanoparticles)
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