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Nanomaterials
Special Issues
Synthesis and Properties of Nanocrystalline Magnetic Materials
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Synthesis and Properties of Nanocrystalline Magnetic Materials

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Synthesis, Interfaces and Nanostructures".

Deadline for manuscript submissions: closed (31 May 2021) | Viewed by 9429

Special Issue Editors

Dr. Chul-Jin Choi

E-Mail Website
Guest Editor
Powder Materials Division, Korea Institute of Materials Science, Changwon 51508, Republic of Korea
Interests: magnetic materials (hard, soft magnets, etc.); nano powder materials; synthesis of nanostructured materials
Prof. Dr. Zhidong Zhang

E-Mail Website
Guest Editor
Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, China
Interests: magnetic nanocomposite multilayers; magnetic nanoparticles and nanocapsules; 2D magnetic materials and devices; topological materials and heterostructures; magnetic and magneto-transport properties; exact solution and computational complexity of 3D Ising models
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Nanocrystalline magnetic materials have attracted a great deal of attention for several decades due to their unique size-dependent physical properties. Nanoparticles with unique magnetic properties can be synthesized by a number of methods and be used in many fields. Nanocapsules with a shell/core structure have also been studied extensively. The control of nanostructures is crucial for obtaining high-performance magnetic materials. Magnetic heterostructures are important for developing electric devices. A number of thin films and nanowires with various properties have also been reported.

This Special Issue of Nanomaterials will attempt to cover the recent advancements in nanocrystalline magnetic materials, including but not limited to nanoparticles, nanocapsules, nanocrystalline bulk magnetic materials, nanowires, thin films, etc.

Dr. Chul-Jin Choi
Prof. Dr. Zhidong Zhang
Guest Editor

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 2400 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

  • nanocrystalline/nanocrystals bulk magnetic materials
  • magnetic nanoparticles
  • nanocapsules
  • shell/core structure
  • magnetic heterostructures
  • nanowires
  • thin films

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Published Papers (2 papers)

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19 pages, 4943 KiB  
Article
Solvothermal Synthesis Combined with Design of Experiments—Optimization Approach for Magnetite Nanocrystal Clusters
by Joelle Medinger, Miroslava Nedyalkova and Marco Lattuada
Nanomaterials 2021, 11(2), 360; https://doi.org/10.3390/nano11020360 - 1 Feb 2021
Cited by 19 | Viewed by 5295
Abstract
Magnetite nanocrystal clusters are being investigated for their potential applications in catalysis, magnetic separation, and drug delivery. Controlling their size and size distribution is of paramount importance and often requires tedious trial-and-error experimentation to determine the optimal conditions necessary to synthesize clusters with [...] Read more.
Magnetite nanocrystal clusters are being investigated for their potential applications in catalysis, magnetic separation, and drug delivery. Controlling their size and size distribution is of paramount importance and often requires tedious trial-and-error experimentation to determine the optimal conditions necessary to synthesize clusters with the desired properties. In this work, magnetite nanocrystal clusters were prepared via a one-pot solvothermal reaction, starting from an available protocol. In order to optimize the experimental factors controlling their synthesis, response surface methodology (RSM) was used. The size of nanocrystal clusters can be varied by changing the amount of stabilizer (tribasic sodium citrate) and the solvent ratio (diethylene glycol/ethylene glycol). Tuning the experimental conditions during the optimization process is often limited to changing one factor at a time, while the experimental design allows for variation of the factors’ levels simultaneously. The efficiency of the design to achieve maximum refinement for the independent variables (stabilizer amount, diethylene glycol/ethylene glycol (DEG/EG) ratio) towards the best conditions for spherical magnetite nanocrystal clusters with desirable size (measured by scanning electron microscopy and dynamic light scattering) and narrow size distribution as responses were proven and tested. The optimization procedure based on the RSM was then used in reverse mode to determine the factors from the knowledge of the response to predict the optimal synthesis conditions required to obtain a good size and size distribution. The RSM model was validated using a plethora of statistical methods. The design can facilitate the optimization procedure by overcoming the trial-and-error process with a systematic model-guided approach. Full article
(This article belongs to the Special Issue Synthesis and Properties of Nanocrystalline Magnetic Materials)
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12 pages, 3421 KiB  
Article
Effects of Mg and Sb Substitution on the Magnetic Properties of Magnetic Field Annealed MnBi Alloys
by Hui-Dong Qian, Yang Yang, Jung Tae Lim, Jong-Woo Kim, Chul-Jin Choi and Jihoon Park
Nanomaterials 2020, 10(11), 2265; https://doi.org/10.3390/nano10112265 - 16 Nov 2020
Cited by 10 | Viewed by 3262
Abstract
Rare-earth-free permanent magnets have attracted considerable attention due to their favorable properties and applicability for cost-effective, high-efficiency, and sustainable energy devices. However, the magnetic field annealing process, which enhances the performance of permanent magnets, needs to be optimized for different magnetic fields and [...] Read more.
Rare-earth-free permanent magnets have attracted considerable attention due to their favorable properties and applicability for cost-effective, high-efficiency, and sustainable energy devices. However, the magnetic field annealing process, which enhances the performance of permanent magnets, needs to be optimized for different magnetic fields and phases. Therefore, we investigated the effect of composition on the crystallization of amorphous MnBi to the ferromagnetic low-temperature phase (LTP). The optimal compositions and conditions were applied to magnetic field annealing under 2.5 T for elemental Mg- and Sb/Mg pair-substituted MnBi. The optimum MnBi composition for the highest purity LTP was determined to be Mn56Bi44, and its maximum energy product, (BH)max, was 5.62 MGOe. The Mg-substituted MnBi exhibited enhanced squareness (Mr/Ms), coercivity (Hc), and (BH)max values up to 0.8, 9659 Oe, and 5.64 MGOe, respectively, whereas the same values for the Sb/Mg pair-substituted MnBi were 0.76, 7038 Oe, and 5.60 MGOe, respectively. The substitution effects were also investigated using first-principles calculations. The density of states and total magnetic moments of Mn16Bi15Mg and Mn16Bi15Sb were similar to those of pure Mn16Bi16. Conversely, the Sb-substituted MnBi resulted in a dramatic enhancement in the anisotropy constant (K) from a small negative value (−0.85 MJ/m3) to a large positive value (6.042 MJ/m3). Full article
(This article belongs to the Special Issue Synthesis and Properties of Nanocrystalline Magnetic Materials)
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