Modern Magnetic Systems: Theory and Experiment in Concert

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

Deadline for manuscript submissions: closed (31 December 2021) | Viewed by 7927

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Guest Editor
University of Lodz, Faculty of Physics and Applied Informatics, Department of Solid State Physics, PL90-236 Łódź, Poland
Interests: theory/models of magnetism; thermodynamics and statistical physics; theoretical description of modern low-dimensional materials
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Special Issue Information

Dear Colleagues,

Technological development relies on novel magnetic materials, the design and characterization of which constitutes a highly challenging task for the contemporary magnetochemistry community and, more generally, for condensed matter scientists. In particular, the needs of nanotechnology stimulate the progress in magnetochemistry and prove that the most promising materials may include molecule-based systems (incorporating, for example, single-molecule magnets and metal–organic frameworks), various classes of magnetic nanostructures, and a plethora of related systems. Their existing and future applications can be as diverse as quantum information processing and magnetocaloric cooling. Maintaining the progress requires the development of novel theoretical models to describe the existing materials and optimize their properties as well as emergence of new theoretical ideas to invent and design innovative magnetic systems with unique attributes. On the other hand, their characterization stimulates mastering the relevant experimental techniques. The broad and interdisciplinary field of magnetism calls for concerted efforts of theoreticians and experimentalists focused on achieving a complete understanding of the highly promising materials.

The aim of this Special Issue of Magnetochemistry entitled “Modern Magnetic Systems: Theory and Experiment in Concert” is to collect works deepening our knowledge on modern magnetic materials. The scope of this issue includes but is not limited to the following theoretical and experimental topics: the theory of modern magnetic systems; contemporary models useful for their description, understanding, and prediction of the properties; relevant computational methods in the field of magnetism; and experimental approaches and techniques for characterization of modern magnetic materials. Papers focused on either theoretical or experimental results are welcome, whereas studies combining both approaches would be especially valuable.

It is my great pleasure to invite you to submit your manuscripts presenting recent original results to this Special Issue of Magnetochemistry.

You may choose our Joint Special Issue in Applied Sciences.

Dr. Karol Szałowski
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. Magnetochemistry 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 2700 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

  • Theory of magnetic systems
  • Thermodynamics of magnets
  • Models of magnetism
  • Experimental methods in magnetism
  • Molecular magnetism
  • Single-molecule magnets
  • Metal–organic frameworks
  • Magnetic nanostructures

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Published Papers (3 papers)

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10 pages, 37313 KiB  
Article
Magnetic Properties Study of Iron Oxide Nanoparticles-Loaded Poly(ε-caprolactone) Nanofibres
by Wojciech Sas, Małgorzata Jasiurkowska-Delaporte, Paweł Czaja, Piotr Maciej Zieliński and Magdalena Fitta
Magnetochemistry 2021, 7(5), 61; https://doi.org/10.3390/magnetochemistry7050061 - 5 May 2021
Cited by 5 | Viewed by 2452
Abstract
Magnetic nanofibres have attracted more and more attention recently due to their possible applications e.g., in spintronics and neuromorphic computing. This work presents the synthesis and physicochemical characterization of the electrospun nanofibres of poly(ε-caprolactone) (PCL) doped by iron oxide nanoparticles with diameters of [...] Read more.
Magnetic nanofibres have attracted more and more attention recently due to their possible applications e.g., in spintronics and neuromorphic computing. This work presents the synthesis and physicochemical characterization of the electrospun nanofibres of poly(ε-caprolactone) (PCL) doped by iron oxide nanoparticles with diameters of 5 nm. PCL is a semi-crystalline, hydrophilic polymer showing controllable biodegradation rates, biocompatibility, and flexible mechanical properties. In the composite material, two different concentrations of magnetic nanoparticles were used: 2 and 6 wt.%. PCL-based composites were investigated using scanning electron microscopy (SEM), Fourier transform infrared spectroscopy (FTIR), and thermogravimetry (TGA). Although in the literature one can find many studies on magnetic polymeric composites, the investigation of their magnetic properties is usually limited to measuring the magnetization curve. Detailed analysis of dynamic magnetic susceptibility is rather rare. In this report, special attention was paid to the detailed analysis of magnetic properties, where we followed the evolution of changes in the magnetic behavior of the material depending on the concentration of magnetic nanoparticles. Full article
(This article belongs to the Special Issue Modern Magnetic Systems: Theory and Experiment in Concert)
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21 pages, 2814 KiB  
Article
Insights into Nature of Magnetization Plateaus of a Nickel Complex [Ni4(μ-CO3)2(aetpy)8](ClO4)4 from a Spin-1 Heisenberg Diamond Cluster
by Katarína Karl’ová, Jozef Strečka, Jozef Haniš and Masayuki Hagiwara
Magnetochemistry 2020, 6(4), 59; https://doi.org/10.3390/magnetochemistry6040059 - 12 Nov 2020
Cited by 7 | Viewed by 2654
Abstract
Magnetic and magnetocaloric properties of a spin-1 Heisenberg diamond cluster with two different coupling constants are investigated with the help of an exact diagonalization based on the Kambe’s method, which employs a local conservation of composite spins formed by spin-1 entities located in [...] Read more.
Magnetic and magnetocaloric properties of a spin-1 Heisenberg diamond cluster with two different coupling constants are investigated with the help of an exact diagonalization based on the Kambe’s method, which employs a local conservation of composite spins formed by spin-1 entities located in opposite corners of a diamond spin cluster. It is shown that the spin-1 Heisenberg diamond cluster exhibits several intriguing quantum ground states, which are manifested in low-temperature magnetization curves as intermediate plateaus at 1/4, 1/2, and 3/4 of the saturation magnetization. In addition, the spin-1 Heisenberg diamond cluster may also exhibit an enhanced magnetocaloric effect, which may be relevant for a low-temperature refrigeration achieved through the adiabatic demagnetization. It is evidenced that the spin-1 Heisenberg diamond cluster with the antiferromagnetic coupling constants J1/kB = 41.4 K and J2/kB = 9.2 K satisfactorily reproduces a low-temperature magnetization curve recorded for the tetranuclear nickel complex [Ni4(μ-CO3)2(aetpy)8](ClO4)4 (aetpy = 2-aminoethyl-pyridine) including a size and position of intermediate plateaus detected at 1/2 and 3/4 of the saturation magnetization. A microscopic nature of fractional magnetization plateaus observed experimentally is clarified and interpreted in terms of valence-bond crystal with either a single or double valence bond. It is suggested that this frustrated magnetic molecule can provide a prospective cryogenic coolant with the maximal isothermal entropy change ΔSM=10.6 J·K1·kg1 in a temperature range below 2.3 K. Full article
(This article belongs to the Special Issue Modern Magnetic Systems: Theory and Experiment in Concert)
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16 pages, 7357 KiB  
Article
Effect of Single-Ion Anisotropy on Magnetocaloric Properties of Frustrated Spin-s Ising Nanoclusters
by Mariia Mohylna and Milan Žukovič
Magnetochemistry 2020, 6(4), 56; https://doi.org/10.3390/magnetochemistry6040056 - 1 Nov 2020
Cited by 5 | Viewed by 2156
Abstract
Effects of a single-ion anisotropy on magnetocaloric properties of selected spin-s1 antiferromagnetic Ising clusters with frustration-inducing triangular geometry are studied by exact enumeration. It is found that inclusion of the single-ion anisotropy parameter D can result in a much more [...] Read more.
Effects of a single-ion anisotropy on magnetocaloric properties of selected spin-s1 antiferromagnetic Ising clusters with frustration-inducing triangular geometry are studied by exact enumeration. It is found that inclusion of the single-ion anisotropy parameter D can result in a much more complex ground-state behavior, which is also reflected in a magnetocaloric effect (MCE) at finite temperatures. For negative D (easy-plane anisotropy) with increasing s, the ground-state magnetization as a function of the external field gradually shows increasing number of plateaus of various heights. Except for the cases of integer s with D<D00, the first magnetization plateau is of non-zero height. This property facilitates an enhanced MCE in the adiabatic demagnetization process in the form of an abrupt decrease in temperature as the magnetic field vanishes to zero. The cooling rate can be considerably enhanced in the systems with larger s and D>0 (easy-axis anisotropy), albeit its dependence on these parameters is strongly dependent on the cluster geometry. From the studied systems more favorable conditions for observing a giant MCE were found in the 2CS cluster, consisting of two corner-sharing tetrahedra, the experimental realization of which could be technologically used for efficient refrigeration to ultra-low temperatures. Full article
(This article belongs to the Special Issue Modern Magnetic Systems: Theory and Experiment in Concert)
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