Special Issue "Ferromagnetism"

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

Deadline for manuscript submissions: closed (1 September 2021) | Viewed by 3815

Special Issue Editors

Dr. Masami Tsubota
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Guest Editor
Physonit Inc., Hiroshima, Japan
Interests: functional materials; alloys; oxides; nitrides; recycle; crystal structure
Prof. Dr. Jiro Kitagawa
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Guest Editor
Department of Electrical Engineering, Faculty of Engineering, Fukuoka Institute of Technology, 3–30-1 Wajiro-higashi, Higashi-ku, Fukuoka 811–0295, Japan
Interests: high-entropy alloys; magnetic materials; alloys; rare metals; superconducting materials; recycle
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Special Issue Information

Dear Colleagues,

Magnetic materials are essential to achieving a sustainable society. For instance, the development of batteries is required for electric vehicles (EVs), but magnetic materials are absolutely needed for the motor on EVs. At the same time, magnetic materials are used for storage, and their value to smart society has been growing, as they save energy. However, most permanent magnets are made from alloys of rare earth elements (REEs), and mining and processing of the elements produces toxic by-products, leading to ecological challenges around mines and refineries. With these in mind, further studies from fundamental to applicational are indispensable.

The aim of the Special Issue of the open-access journal Magnetochemistry is to collect excellent works of the most recent discoveries in the field of magnetic field. Review articles are very welcome. Topics to be covered include but are not limited to:

  • Ferromagnets and antiferromagnets;
  • REEs;
  • Spintronics;
  • Films;
  • Recycling;
  • Physics, chemistry, and metallurgy;
  • Measurement;
  • Analysis methods.

Dr. Masami Tsubota
Prof. Dr. Jiro Kitagawa
Guest Editors

Manuscript Submission Information

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Published Papers (4 papers)

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Research

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Article
Simple Realistic Model of Spin Reorientation in 4f-3d Compounds
Magnetochemistry 2022, 8(4), 45; https://doi.org/10.3390/magnetochemistry8040045 - 14 Apr 2022
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Abstract
This is a simple but realistic microscopic theory of spontaneous spin reorientation in rare-earth perovskites, orthoferrites RFeO3 and orthochromites RCrO3, induced by the 4f-3d interaction, namely, the interaction of the well-isolated ground-state Kramers doublet or non-Kramers quasi-doublet of [...] Read more.
This is a simple but realistic microscopic theory of spontaneous spin reorientation in rare-earth perovskites, orthoferrites RFeO3 and orthochromites RCrO3, induced by the 4f-3d interaction, namely, the interaction of the well-isolated ground-state Kramers doublet or non-Kramers quasi-doublet of the 4f ion with an effective magnetic field induced by 3d sublattice. Both the temperature and the nature of the spin-reorientation transition are the result of competition between the second- and fourth-order spin anisotropy of the 3d sublattice, the crystal field for 4f ions, and 4f-3d interaction. Full article
(This article belongs to the Special Issue Ferromagnetism)
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Article
Magnetic Behaviour of Perovskite Compositions Derived from BiFeO3
Magnetochemistry 2021, 7(11), 151; https://doi.org/10.3390/magnetochemistry7110151 - 16 Nov 2021
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Abstract
The phase content and sequence, the crystal structure, and the magnetic properties of perovskite solid solutions of the (1−y)BiFeO3yBiZn0.5Ti0.5O3 series (0.05 ≤ y ≤ 0.90) synthesized under high pressure have been studied. [...] Read more.
The phase content and sequence, the crystal structure, and the magnetic properties of perovskite solid solutions of the (1−y)BiFeO3yBiZn0.5Ti0.5O3 series (0.05 ≤ y ≤ 0.90) synthesized under high pressure have been studied. Two perovskite phases, namely the rhombohedral R3c and the tetragonal P4mm, which correspond to the structural types of the end members, BiFeO3 and BiZn0.5Ti0.5O3, respectively, were revealed in the as-synthesized samples. The rhombohedral and the tetragonal phases were found to coexist in the compositional range of 0.30 ≤ y ≤ 0.90. Magnetic properties of the BiFe1−y[Zn0.5Ti0.5]yO3 ceramics with y < 0.30 were measured as a function of temperature. The obtained compositional variations of the normalized unit-cell volume and the Néel temperature of the BiFe1−y[Zn0.5Ti0.5]yO3 perovskites in the range of their rhombohedral phase were compared with the respective dependences for the BiFe1−yB3+yO3 perovskites (where B3+ = Ga, Co, Mn, Cr, and Sc). The role of the high-pressure synthesis in the formation of the antiferromagnetic states different from the modulated cycloidal one characteristic of the parent BiFeO3 is discussed. Full article
(This article belongs to the Special Issue Ferromagnetism)
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Article
A Quantum-Mechanical Study of Antiphase Boundaries in Ferromagnetic B2-Phase Fe2CoAl Alloy
Magnetochemistry 2021, 7(10), 137; https://doi.org/10.3390/magnetochemistry7100137 - 09 Oct 2021
Cited by 1 | Viewed by 737
Abstract
In this study, we performed a quantum mechanical examination of thermodynamic, structural, elastic, and magnetic properties of single-phase ferromagnetic Fe2CoAl with a chemically disordered B2-type lattice with and without antiphase boundaries (APBs) with (001) crystallographic orientation. Fe2CoAl was modeled [...] Read more.
In this study, we performed a quantum mechanical examination of thermodynamic, structural, elastic, and magnetic properties of single-phase ferromagnetic Fe2CoAl with a chemically disordered B2-type lattice with and without antiphase boundaries (APBs) with (001) crystallographic orientation. Fe2CoAl was modeled using two different 54-atom supercells with atoms on the two B2 sublattices distributed according to the special quasi-random structure (SQS) concept. Both computational models exhibited very similar formation energies (−0.243 and −0.244 eV/atom), B2 structure lattice parameters (2.849 and 2.850 Å), magnetic moments (1.266 and 1.274 μB/atom), practically identical single-crystal elastic constants (C11 = 245 GPa, C12 = 141 GPa, and similar C44 = 132 GPa) and auxetic properties (the lowest Poisson ratio close to −0.1). The averaged APB interface energies were observed to be 199 and 310 mJ/m2 for the two models. The studied APBs increased the total magnetic moment by 6 and 8% due to a volumetric increase as well as local changes in the coordination of Fe atoms (their magnetic moments are reduced for increasing number of Al neighbors but increased by the presence of Co). The APBs also enhanced the auxetic properties. Full article
(This article belongs to the Special Issue Ferromagnetism)
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Review

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Review
Structure–Property Relationships for Weak Ferromagnetic Perovskites
Magnetochemistry 2021, 7(8), 111; https://doi.org/10.3390/magnetochemistry7080111 - 03 Aug 2021
Cited by 3 | Viewed by 577
Abstract
Despite several decades of active experimental and theoretical studies of rare-earth orthoferrites, the mechanism of the formation of their specific magnetic, magnetoelastic, optical, and magneto-optical properties remains a subject of discussion. This paper provides an overview of simple theoretical model approaches to quantitatively [...] Read more.
Despite several decades of active experimental and theoretical studies of rare-earth orthoferrites, the mechanism of the formation of their specific magnetic, magnetoelastic, optical, and magneto-optical properties remains a subject of discussion. This paper provides an overview of simple theoretical model approaches to quantitatively describing the structure–property relationships—in particular, the interplay between FeO6 octahedral deformations/rotations and the main magnetic and optic characteristics, such as Néel temperature, overt and hidden canting of magnetic sublattices, magnetic and magnetoelastic anisotropy, and optic and photoelastic anisotropy. Full article
(This article belongs to the Special Issue Ferromagnetism)
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