Submit to Magnetochemistry Review for Magnetochemistry

Journal Menu

Journal Browser

Magnetochemistry, Volume 11, Issue 1 (January 2025) – 5 articles

Cover Story (view full-size image): Single-molecule magnets (SMMs) could be major components in future revolutionary micro-electronic devices. Here, a theoretical study, based on ab initio electronic structure calculations, is performed in a group of 16 pentacoordinate Dy-SMMs. Theoretical results provide a reasonable explanation for the observed SMM performance based on a concise criterion, i.e., the co-existence of long τ_QTM and high U_eff. Better SMM performance generally locates at a position closer to the lower right corner of the plane defined by τ_QTM and U_eff. To have a desired electronic structure, favoring good SMM performance, the contribution from the equatorial coordinating atoms might be even more important than that from the axial coordinating atoms. View this paper

Issues are regarded as officially published after their release is announced to the table of contents alert mailing list.
You may sign up for e-mail alerts to receive table of contents of newly released issues.
PDF is the official format for papers published in both, html and pdf forms. To view the papers in pdf format, click on the "PDF Full-text" link, and use the free Adobe Reader to open them.

Order results

Result details

Section

Show export options Show export options

Select all

Export citation of selected articles as:

23 pages, 3584 KiB

Open AccessReview

Recent Advances of Colossal Magnetoresistance in Versatile La-Ca-Mn-O Material-Based Films

by Navjyoti Boora, Rafiq Ahmad, Shafaque Rahman, Nguyen Quoc Dung, Akil Ahmad, Mohammed B. Alshammari and Byeong-Il Lee

Magnetochemistry 2025, 11(1), 5; https://doi.org/10.3390/magnetochemistry11010005 - 16 Jan 2025

Viewed by 580

Abstract

Hole-doped manganese oxides exhibit a gigantic negative magnetoresistance, referred to as colossal magnetoresistance (CMR), owing to the interplay between double-exchange (DE) ferromagnetic metal and charge-ordered antiferromagnetic insulator/semiconductor phases. Magnetoresistive manganites display a sharp resistivity drop at the metal–insulator transition temperature (T^MI). CMR effects in perovskite manganites, specifically La_0.67Ca_0.33MnO₃ (La-Ca-Mn-O or LCMO), have been extensively investigated. This review paper provides a comprehensive introduction to the crystallographic structure, as well as the electronic and magnetic properties, of LCMO films. Furthermore, we delve into a detailed discussion of the effects of epitaxial strain induced by different substrates on LCMO films. Additionally, we review the early findings and diverse applications of LCMO thin films. Finally, we outline potential challenges and prospects for achieving superior LCMO film properties. Full article

(This article belongs to the Special Issue Magnetic Materials, Thin Films and Nanostructures—2nd Edition)

► Show Figures

Figure 1

15 pages, 3973 KiB

Open AccessArticle

Exploring the Potential of Oxalyldihydrazide-Derived Schiff Bases as Versatile Ligands: Synthesis, Structural Characterization, and Magnetic Properties

by Ernesto Costa-Villén, Marina Ortiz, Pedro Sitjar, Cristina Puigjaner and Mohamed Salah El Fallah

Magnetochemistry 2025, 11(1), 4; https://doi.org/10.3390/magnetochemistry11010004 - 13 Jan 2025

Viewed by 468

Abstract

Schiff bases constitute a broad and well-established class of ligands widely utilized in coordination chemistry. To further enrich this family and assess the potential impact of oxalyldihydrazide-derived Schiff bases in the realms of coordination chemistry and molecular magnetism, three novel ligands have been synthesized and investigated. i.e., N′1,N′2-bis((E)-pyridin-2-ylmethylene)oxalohydrazide (H₂L1), N′1-((E)-(3-methylpyridin-2-yl)methylene)-N′2-((E)-(6-methylpyridin-2-yl)methylene)oxalohydrazide (H₂L2) and N′1,N′2-bis((E)-phenyl(pyridin-2-yl)methylene)oxalohydrazide (H₂L3) were synthesized and then combined with various 3d metals, resulting in the formation of five new complexes with formula [Cu₅(L1)₂(H₂O)₈(MeOH)₂(NO₃)₂](NO₃)₄ (1), [Mn₂(HL2)₂(BzO)₂(MeOH)₂]·2MeOH (2), [Ni(HL2)₂]·2MeOH (3), [Ni₄(L2)₄]·4MeOH (4), [Ni₈(L3)₄(AcO)₄(H₂O)₁₂](OAc)₄ (5). These compounds were structurally and magnetically characterized, revealing the various coordination modes exhibited by the ligands and a distinct antiferromagnetic behavior. Alternating current (AC) susceptibility measurements were conducted on complex 1, showing no evidence of Single Molecule Magnet (SMM) behavior. Full article

(This article belongs to the Special Issue Latest Research on the Magnetic Properties of Coordination Compounds)

► Show Figures

Graphical abstract

13 pages, 2867 KiB

Open AccessArticle

Theoretical Study of Pentacoordinated Lanthanide Single-Ion Magnets via Ab Initio Electronic Structure Calculation

by Yu-Xi Wang, Yu-Fei Wang and Bing Yin

Magnetochemistry 2025, 11(1), 3; https://doi.org/10.3390/magnetochemistry11010003 - 7 Jan 2025

Viewed by 543

Abstract

A theoretical study, based on ab initio electronic structure calculation, is performed in a group of 16 pentacoordinate Dy-SIMs. Theoretical results provide a reasonable explanation of the observed SMM performance based on a concise criterion, i.e., the co-existence of long τ_QTM and high U_eff. To have the desired electronic structure favoring good SMM performance, the contribution from the equatorial coordinating atoms might be even more important than that from the axial coordinating atoms. Widening the axial ∠O–Dy–O might be a probable way to improve the SMM performance of pentacoordinated Dy-SIMs. Starting from existing systems, a rigid-scan type exploration indicates the possibility of U_eff higher than 1600 K. Full article

(This article belongs to the Special Issue Molecular Magnetism: A Themed Issue in Honor of Professor Dai-Zheng Liao on the Occasion of His 85th Birthday)

► Show Figures

Figure 1

13 pages, 4139 KiB

Open AccessArticle

Microstructural, Morphological, and Magnetic Effects of NiFe₂O₄ Shell Formation Around Nanospherical ZnFe₂O₄ Cores

by Marija Šuljagić, Vuk Uskoković, Lukasz Kilanski, Sabina Lewinska, Abdul Khaliq, Anna Ślawska-Waniewska, Aleksandar Kremenović, Vladimir Pavlović, Dejan A. Jeremić and Ljubica Andjelković

Magnetochemistry 2025, 11(1), 2; https://doi.org/10.3390/magnetochemistry11010002 - 5 Jan 2025

Viewed by 588

Abstract

First-row transition metal oxides have relatively modest magnetic properties compared to those of permanent magnets based on rare earth elements. However, there is a hope that this gap might be bridged via proper compositional and structural adjustments. Bi-magnetic nanostructures with homogeneous interfaces often exhibit a combination or synergy of properties of both phases, resulting in improved performance compared to their monophasic magnetic counterparts. To gain a deeper insight into these complex structures, a bi-magnetic nanostructured material composed of superparamagnetic nanoparticles comprising a zinc ferrite core and a nickel ferrite shell was synthesized using the seed-mediated growth approach. The resulting ZnFe₂O₄@NiFe₂O₄ core–shell nanoparticles were characterized using a series of experimental techniques and were compared to the ZnFe₂O₄ cores. Most importantly, the formation of the NiFe₂O₄ shell around the ZnFe₂O₄ core improved the net crystallinity of the material and altered the particle morphology by reducing the convexity of the surface. Simultaneously, the magnetic measurements demonstrated the coherence of the interface between the core and the shell. These effects combined led to improved spin coupling and stronger magnetism, as evidenced by higher saturation magnetization and the doubling of the blocking temperature for the ZnFe₂O₄@NiFe₂O₄ core–shell particles relative to the ZnFe₂O₄ cores. Full article

► Show Figures

Figure 1

14 pages, 2876 KiB

Open AccessArticle

Slow Relaxation of the Magnetisation in a Two-Dimensional Metal–Organic Framework with a Layered Square Lattice

by Samia Benmansour, Christian Cerezo-Navarrete and Carlos J. Gómez-García

Magnetochemistry 2025, 11(1), 1; https://doi.org/10.3390/magnetochemistry11010001 - 26 Dec 2024

Viewed by 584

Abstract

Herein, we present the synthesis and structural characterisation of two layered MOFs with the asymmetric ligand 3-chloro,6-cyano-2,5-dihydroxy-1,4-benzoquinone dianion (C₆O₄(CN)Cl²⁻ = chlorocyananilato). These compounds, formulated as (H₃O)[Eu(C₆O₄(CN)Cl)₂(H₂O)]·34H₂O (1) and (H₃O)[Dy(C₆O₄(CN)Cl)₂(H₂O)]·44H₂O (2), are isostructural and show a (4,4)-layered square structure with the crystallisation water molecules located between the layers. The lanthanoid ions are surrounded by four bis-bidentate chlorocyananilato ligands that connect each Ln^III centre with other four, giving rise to square cavities formed by Ln^III centres in the vertices and chlorocyananilato ligands as the sides. There is an additional coordinated water molecule that occupies the caped position of the capped square antiprismatic coordination geometry around the Ln^III centres. The magnetic properties show the presence of a field-induced slow relaxation of the magnetisation in the Dy^III derivative at low temperatures that follows Direct and Orbach relaxation mechanisms with an energy barrier of 36(3) K. Full article

(This article belongs to the Special Issue Magnetic Coordination Compounds and More... a Long and Successful Story: A Tribute to M. Julve and F. Lloret)

► Show Figures