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Advances in Molecular Magnetic Materials

A special issue of Materials (ISSN 1996-1944). This special issue belongs to the section "Materials Chemistry".

Deadline for manuscript submissions: closed (15 December 2020) | Viewed by 7746

Special Issue Editor


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Guest Editor
Institute of Nuclear Physics, Polish Academy of Sciences, 31-342 Kraków, Poland
Interests: functional materials, molecular magnetism, molecular thin films, magnetocaloric effect
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

Molecular magnetism is a young, interdisciplinary, and intensively developed research area. Among molecular magnets, one can find an extensive collection of materials combining unique magnetic properties and other features, such as low density, transparency, and biocompatibility. Furthermore, molecular magnets can be treated as functional materials, which denotes that their properties can change under the application of external stimuli, such as magnetic or electric fields, temperature, and light or water content. Photomagnetism, spin crossover transition, magnetic sponge-like behavior or sorption capacity are only some of the examples of molecular magnets’ functionalities. In the last few years, there has also been significant interest in the investigation of low-dimensional magnets motivated by their potential applicability in qubits, molecular spintronics, high-density magnetic storage or nanoscale devices.

This Special Issue will cover recent progress and novel trends in the field of molecular magnetism. Its aim is to collect several high-quality papers (full papers, communications or reviews) presenting the advances in synthesis, physicochemical characterization, as well as applications of magnetic molecular materials. In particular, the topics of interest include but are not limited to:
  • Novel functionalities of molecular magnets: photomagnetism, magnetization-induced second-harmonic generation, humidity-sensitive magnetism;
  • Spin switching molecular compounds: spin–crossover (SCO);
  • Slow relaxation in molecular materials: single-molecule magnets (SMM) and single-chain magnets (SCM);
  • Synthesis and characterization of molecular materials of reduced dimensionality: thin films and nanoparticles;
  • Design and properties of molecule-based magnetic coolers;
  • Molecular nanomagnets for future applications: molecular spintronics, quantum information processing and information technologies.

Dr. Magdalena Fitta
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. Materials 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 2600 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

  • molecule-based magnets
  • thin films of molecular magnets
  • molecular spintronics
  • multifunctional/hybrid molecular magnets
  • molecular coolers
  • magnetic MOFs
  • materials engineering

Published Papers (3 papers)

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Research

10 pages, 5964 KiB  
Article
Magnetic, Structural and Spectroscopic Properties of Iron(II)-Octacyanoniobate(IV) Crystalline Film Obtained by Ion-Exchange Synthesis
by Wojciech Sas, Dawid Pinkowicz, Marcin Perzanowski and Magdalena Fitta
Materials 2020, 13(13), 3029; https://doi.org/10.3390/ma13133029 - 07 Jul 2020
Cited by 3 | Viewed by 1836
Abstract
Over recent years, investigations of coordination polymer thin films have been initiated due to their unique properties, which are expected to be strongly enhanced in the thin film form. In this work, a crystalline [FeII(H2O)2]2[Nb [...] Read more.
Over recent years, investigations of coordination polymer thin films have been initiated due to their unique properties, which are expected to be strongly enhanced in the thin film form. In this work, a crystalline [FeII(H2O)2]2[NbIV(CN)8]∙4H2O (1) film on a transparent Nafion membrane was obtained, for the first time, via ion-exchange synthesis. The proper film formation and its composition was confirmed with the use of energy dispersive X-ray spectroscopy and infrared spectroscopy, as well as in situ Ultraviolet-Visible (UV-Vis) spectroscopy. The obtained film were also characterized by scanning electron microscopy, X-ray diffraction, and magnetic measurements. The [FeII(H2O)2]2[NbIV(CN)8]∙4H2O film shows a sharp phase transition to a long-range magnetically ordered state at Tc = 40 K. The 1 film is a soft ferromagnet with the coercive field Hc = 1.2 kOe. Compared to the bulk counterpart, a decrease in critical temperature and a significant increase in the coercive field were observed in the films indicating a distinct size effect. The decrease in Tc could also have been related to the possible partial oxidation of FeII ions to FeIII, which could be efficient, due to the large surface of the thin film sample. Full article
(This article belongs to the Special Issue Advances in Molecular Magnetic Materials)
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16 pages, 4023 KiB  
Article
Magnetocaloric Effect in Cu5-NIPA Molecular Magnet: A Theoretical Study
by Karol Szałowski and Pamela Kowalewska
Materials 2020, 13(2), 485; https://doi.org/10.3390/ma13020485 - 19 Jan 2020
Cited by 13 | Viewed by 3204
Abstract
We calculated the magnetocaloric properties of the molecular nanomagnet Cu5-NIPA, consisting of five spins S = 1 / 2 arranged in two corner-sharing triangles (hourglass-like structure without magnetic frustration). The thermodynamics of the system in question was described using the quantum Heisenberg model [...] Read more.
We calculated the magnetocaloric properties of the molecular nanomagnet Cu5-NIPA, consisting of five spins S = 1 / 2 arranged in two corner-sharing triangles (hourglass-like structure without magnetic frustration). The thermodynamics of the system in question was described using the quantum Heisenberg model solved within the field ensemble (canonical ensemble) using exact numerical diagonalization. The dependence of the magnetic entropy and magnetic specific heat on the temperature and the external magnetic field was investigated. The isothermal entropy change for a wide range of initial and final magnetic fields was discussed. Due to plateau-like behavior of the isothermal entropy change as a function of the temperature, a high degree of tunability of magnetocaloric effect with the initial and final magnetic field was demonstrated. Full article
(This article belongs to the Special Issue Advances in Molecular Magnetic Materials)
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10 pages, 1692 KiB  
Article
Theoretical Basis for Switching a Kramers Single Molecular Magnet by Circularly-Polarized Radiation
by Alexander G. Maryasov, Michael K. Bowman, Matvey V. Fedin and Sergey L. Veber
Materials 2019, 12(23), 3865; https://doi.org/10.3390/ma12233865 - 22 Nov 2019
Cited by 5 | Viewed by 2024
Abstract
The d-group Kramers ions, having strong zero field splitting (ZFS) with axial symmetry and a negative D value for the ZFS Hamiltonian, are widely considered as candidates for use as single molecular magnets (SMMs). An important need is the means to switch [...] Read more.
The d-group Kramers ions, having strong zero field splitting (ZFS) with axial symmetry and a negative D value for the ZFS Hamiltonian, are widely considered as candidates for use as single molecular magnets (SMMs). An important need is the means to switch the SMM between its states in a reasonably short and predictable period of time, which is generally not available. We propose an approach, Zeeman–far infrared (ZeFIR) double resonance, in which circularly polarized alternating magnetic fields in the far infrared (FIR) range induce selective magnetic dipole transitions between different Kramers doublets of the SMM and polarized microwave (mw) pulses transfer excitation inside the upper Kramers doublet. A combination of FIR and mw pulses allows unidirectional switching between +S and −S states of the ion. The proposed approach is considered for a model quartet system with total spin S = 3/2, which seems to be the most promising object for selective resonance manipulations of its states by circularly polarized radiation. Full article
(This article belongs to the Special Issue Advances in Molecular Magnetic Materials)
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