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Magnetochemistry
Special Issues
Emerging Applications and Developments in Spin Crossover Systems
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Emerging Applications and Developments in Spin Crossover Systems

A special issue of Magnetochemistry (ISSN 2312-7481). This special issue belongs to the section "Spin Crossover and Spintronics".

Deadline for manuscript submissions: closed (20 November 2022) | Viewed by 9366
Related Special Issue: https://www.mdpi.com/journal/applsci/special_issues/sco_sys

Special Issue Editor

Prof. Dr. Greg A. Brewer

E-Mail Website
Guest Editor
Department of Chemistry, Catholic University of America, Washington, DC 20064, USA
Interests: supramolecular; homochirality; structure; magnetic properties; magnetostructural
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear colleagues,

There are potential applications of Spin Crossover (SCO) complexes that rely on their bistability, two electronic ground states in the field of electronic devices (switches and memory device), sensors and the incorporation of SCO molecules into larger materials. Manuscripts dealing with these topics are invited to a forthcoming Special Issue on spin crossover (SCO) in magnetochemistry.

For potential applications in electronics, the existence of an abrupt SCO itself suggests applications as a switch, on or off. To use a molecule as a memory device it needs the SCO, but there also needs to be hysteresis, a difference in T½ between heating and cooling curves, so that the molecule retains a memory of its past in terms of temperature cycling. Investigation of the parameters that may alter T½ and the existence of hysteresis such as particle size, the effect of counterions and solvates, and chemical modification of the ligand system are critical in that this gives the experimentalist the ability to finetune these characteristics. Work showing the incorporation of these molecules into a device or prototype is highly significant. Theoretical/computational methods, based on the structure of the ligand or complex, that could explain or predict T½ or the presence of hysteresis would be of great value to the experimentalist. In addition to electronics, there are potential applications of a spin state change as a chemical sensor. A complex may undergo a spin state change in response to an environmental change.  The thermochromic nature of SCO complexes may allow for easy incorporation into sensing devices. Functionalization of the SCO complex so that it could easily react with other substrates of technical importance is another area of interest. An additional way to modify or finetune the SCO phenomena is to make bi- or polynuclear SCO complexes. These species have magnetic coupling or cooperativity in addition to SCO.  

You may choose our Joint Special Issue in Applied Sciences.

Prof. Dr. Greg A. Brewer
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.

Published Papers (3 papers)

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Research

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10 pages, 3313 KiB  
Article
Non-Volatile Regulation of Magnetism via Electric Fields in Polycrystal FeSi/(011) PMN-0.32PT Heterostructures
by Xiaobin Guo, Fengchao Su, Xiaoling Lu, Xingui Tang, Zhenhua Tang, Wenhua Li, Yanping Jiang, Qiuxiang Liu, Yalu Zuo and Li Xi
Magnetochemistry 2020, 6(4), 57; https://doi.org/10.3390/magnetochemistry6040057 - 10 Nov 2020
Cited by 1 | Viewed by 1922
Abstract
The choice and configuration of the ferroelectric (FE) substrate and the ferromagnetic (FM) layer in FM/FE heterostructures play an important role in magnetism modification with regard to amplitude and efficiency. In this study, we fabricated FeSi films on low crystalline (011) [Pb(Mg1/3 [...] Read more.
The choice and configuration of the ferroelectric (FE) substrate and the ferromagnetic (FM) layer in FM/FE heterostructures play an important role in magnetism modification with regard to amplitude and efficiency. In this study, we fabricated FeSi films on low crystalline (011) [Pb(Mg1/3Nb2/3)O3]0.7-[PbTiO3]0.3 (PMN-0.32PT) using radio frequency magnetron sputtering. In the annealed FeSi/(011) PMN-0.32PT heterostructures, the FeSi film presented with a (011) preferred orientated polycrystalline structure and low magnetocrystalline anisotropy. Both loop-like and butterfly-like magnetism modifications were observed by applying bipolar electric fields, and the weak and abnormal electrically mediated magnetism behaviors were significantly different from the prominent magnetic anisotropy transition in FeSi/(011) PMN-0.3PT. The comparative analyses suggest that the resulting high-quality single-crystalline PMN-xPT and FM films with low coercivity are of great significance for exploring giant, reversible, and non-volatile magnetism regulation. Full article
(This article belongs to the Special Issue Emerging Applications and Developments in Spin Crossover Systems)
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12 pages, 6321 KiB  
Article
Exploring the Effects of Synthetic and Postsynthetic Grinding on the Properties of the Spin Crossover Material [Fe(atrz)3](BF4)2 (atrz = 4-Amino-4H-1,2,4-Triazole)
by Jed H. Askew, David M. Pickup, Gareth O. Lloyd, Alan V. Chadwick and Helena J. Shepherd
Magnetochemistry 2020, 6(3), 44; https://doi.org/10.3390/magnetochemistry6030044 - 15 Sep 2020
Cited by 4 | Viewed by 2215
Abstract
The effects of mechanochemical synthesis and postsynthetic grinding on the spin crossover material [Fe(atrz)3](BF4)2 was examined in detail using a combination of X-ray diffraction, magnetometry, EXAFS and TEM. Mechanochemical synthesis yielded a different polymorph (β-phase) to the solution [...] Read more.
The effects of mechanochemical synthesis and postsynthetic grinding on the spin crossover material [Fe(atrz)3](BF4)2 was examined in detail using a combination of X-ray diffraction, magnetometry, EXAFS and TEM. Mechanochemical synthesis yielded a different polymorph (β-phase) to the solution synthesised sample (α-phase), with a lower temperature spin crossover. Milling duration did not significantly affect this temperature but did result in the production of smaller nanoparticles with a narrower size distribution. It is also possible to convert from α- to the β-phase via postsynthetic grinding. Full article
(This article belongs to the Special Issue Emerging Applications and Developments in Spin Crossover Systems)
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Review

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26 pages, 2932 KiB  
Review
Spin-Crossover Complexes in Direct Contact with Surfaces
by Manuel Gruber and Richard Berndt
Magnetochemistry 2020, 6(3), 35; https://doi.org/10.3390/magnetochemistry6030035 - 27 Aug 2020
Cited by 40 | Viewed by 4479
Abstract
The transfer of the inherent bistability of spin crossover compounds to surfaces has attracted considerable interest in recent years. The deposition of the complexes on surfaces allows investigating them individually and to further understand the microscopic mechanisms at play. Moreover, it offers the [...] Read more.
The transfer of the inherent bistability of spin crossover compounds to surfaces has attracted considerable interest in recent years. The deposition of the complexes on surfaces allows investigating them individually and to further understand the microscopic mechanisms at play. Moreover, it offers the prospect of engineering switchable functional surfaces. We review recent progress in the field with a particular focus on the challenges and limits associated with the dominant experimental techniques used, namely near-edge X-ray absorption fine structure (NEXAFS) spectroscopy and scanning tunneling microscopy (STM). One of the main difficulties in NEXAFS-based experiments is to ascertain that the complexes are in direct contact with the surfaces. We show that molecular coverage determination based on the amplitude of the edge-jump of interest is challenging because the latter quantity depends on the substrate. Furthermore, NEXAFS averages the signals of a large number of molecules, which may be in different states. In particular, we highlight that the signal of fragmented molecules is difficult to distinguish from that of intact and functional ones. In contrast, STM allows investigating individual complexes, but the identification of the spin states is at best done indirectly. As quite some of the limits of the techniques are becoming apparent as the field is gaining maturity, their detailed descriptions will be useful for future investigations and for taking a fresh look at earlier reports. Full article
(This article belongs to the Special Issue Emerging Applications and Developments in Spin Crossover Systems)
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