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Magnetochemistry
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Phase Change Material and Magnetic Research
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Phase Change Material and Magnetic Research

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

Deadline for manuscript submissions: closed (15 December 2023) | Viewed by 10970

Special Issue Editor

Prof. Dr. Shengcan Ma

E-Mail Website
Guest Editor
College of Materials, Metallurgy and Chemistry, Jiangxi University of Science and Technology, No. 1958 Hakka Avenue, Ganzhou 341000, China
Interests: magnetic phase transition; magnetocaloric effect; elasto-caloric effect; baro-caloric effect; magnetostriction; magnetoresistance; magnetic shape memory; martensitic transformation; ferromagnetic shape memory alloys; magnetic field-induced transition; spin reorientation transition; premartensitic transformation; magnetic topological properties; skyrmions

Special Issue Information

Dear Colleagues,

Magnetic phase transitions cover a broad range of research in magnetism and magnetic materials, such as alloys and compounds. Based on the magnetic-field-induced transition, an abundance of physical effects are obtained in the vicinity of magnetic phase transitions, such as magnetocaloric, magnetostriction and magnetoresistance, which have the most potential for practical applications. Even for the stress-induced phase transformation, the elasto- and baro-caloric effects have been intensively investigated. The solid-state refrigeration technology based on the caloric effects, including magneto-, elasto- and baro-caloric effects, is honored as the most probable alternative to today's gas compression refrigeration technology. In addition, based on the spin reorientation and premartensitic transitions, the exchange bias effect, magnetic topological properties and skyrmions are produced in the materials undergoing magnetic phase transitions. In the world, magnetic phase transition and magnetic transition materials are active and pioneering fields. As for the types of magnetic transition materials, one-dimensional, two-dimensional, and three-dimensional materials, e.g., powder, ribbons, films, alloys and so on, can be fabricated, which would produce unprecedented magnetic properties.

Prof. Dr. Shengcan Ma
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

  • magnetic phase transition
  • alloys and compounds
  • magnetic films and ribbons
  • solid-state caloric effect
  • magnetostriction
  • magnetic shape memory
  • magnetoresistance
  • magnetic shape memory
  • martensitic transformation and premartensitic transformation
  • ferromagnetic shape memory alloys
  • magnetic field-induced transition
  • spin reorientation transition
  • magnetic topological properties
  • skyrmions

Published Papers (8 papers)

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Research

10 pages, 2107 KiB  
Article
Magnetic Dilution as a Direct Method for Detecting and Evaluation of Exchange Interactions between Rare Earth Elements in Oxide Systems
by Natalia Chezhina and Anna Fedorova
Magnetochemistry 2023, 9(5), 137; https://doi.org/10.3390/magnetochemistry9050137 - 20 May 2023
Viewed by 1094
Abstract
This work is devoted to the study of exchange interactions between rare earth atoms in the LaAlO3 matrix. Using the magnetic dilution method, the study of concentration and temperature dependences of magnetic susceptibility and effective magnetic moments of diluted solid solutions the [...] Read more.
This work is devoted to the study of exchange interactions between rare earth atoms in the LaAlO3 matrix. Using the magnetic dilution method, the study of concentration and temperature dependences of magnetic susceptibility and effective magnetic moments of diluted solid solutions the magnetic characteristics of single rare earth atoms and the character of superexchange between them are described—antiferromagnetic at low concentrations, and for samarium, predominantly ferromagnetic within greater clusters as the concentration increases. The development of superexchange is similar to the exchange between d-elements in the same matrix. Full article
(This article belongs to the Special Issue Phase Change Material and Magnetic Research)
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13 pages, 3645 KiB  
Article
Unusual Compositions of Fe-Nb Alloy Precipitates in Iron-Implanted LiNbO3
by Almaz L. Zinnatullin, Andrei V. Petrov, Roman V. Yusupov, Valerii F. Valeev, Rustam I. Khaibullin and Farit G. Vagizov
Magnetochemistry 2023, 9(5), 121; https://doi.org/10.3390/magnetochemistry9050121 - 06 May 2023
Viewed by 1045
Abstract
The results of a study of heavy implantation of a LiNbO3 crystal with iron ions are reported for the first time. The X-cut LiNbO3 substrate was implanted with 40-keV Fe+ ions to the fluence of 1.5·1017 ions/cm2. [...] Read more.
The results of a study of heavy implantation of a LiNbO3 crystal with iron ions are reported for the first time. The X-cut LiNbO3 substrate was implanted with 40-keV Fe+ ions to the fluence of 1.5·1017 ions/cm2. The sample reveals pronounced ferromagnetic properties at room temperature. However, the ferromagnetic response observed in the iron-implanted LiNbO3 differs from the magnetic behavior of other oxides implanted with iron ions under the same conditions. This difference occurs from the unusual magnetic phase composition of the implanted surface layer of the LiNbO3 in which the iron implant precipitates in the form of the nanoscale alloy of metallic iron with niobium. Based on Mössbauer spectroscopy data, we estimated the Nb content in the ion-synthesized nanosized alloy as ~12 at.%, which is much higher than the solid solubility limit of Nb in bulk Fe. Full article
(This article belongs to the Special Issue Phase Change Material and Magnetic Research)
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14 pages, 1831 KiB  
Article
Robustness of the Skyrmion Phase in a Frustrated Heisenberg Antiferromagnetic Layer against Lattice Imperfections and Nanometric Domain Sizes
by Mariia Mohylna and Milan Žukovič
Magnetochemistry 2023, 9(4), 101; https://doi.org/10.3390/magnetochemistry9040101 - 06 Apr 2023
Viewed by 1383
Abstract
By employing GPU-implemented hybrid Monte Carlo simulations, we study the robustness of the skyrmion lattice phase (SkX) in a frustrated Heisenberg antiferromagnetic (AFM) layer on a triangular lattice with a Dzyaloshinskii–Moriya interaction in the external magnetic field against the presence of lattice imperfections [...] Read more.
By employing GPU-implemented hybrid Monte Carlo simulations, we study the robustness of the skyrmion lattice phase (SkX) in a frustrated Heisenberg antiferromagnetic (AFM) layer on a triangular lattice with a Dzyaloshinskii–Moriya interaction in the external magnetic field against the presence of lattice imperfections (nonmagnetic impurities) and lattice finiteness. Both features are typical of experimentally accessible magnetic materials and require theoretical investigation. In the pure model of infinite size, SkX is known to be stabilized in a quite wide temperature-field window. We first study the effects of such imperfections on the SkX stability and compare them with those in the nonfrustrated ferromagnetic counterpart. The partial results of this part appeared in the conference proceedings [M. Mohylnaand M. Žukovič, Proceedings of the 36th International ECMS International Conference on Modelling and Simulation, ECMS, 2022]. We further look into whether SkX can also persist in finite clusters, i.e., zero-dimensional systems of nanometric sizes. In general, both the presence of magnetic vacancies as well as the finiteness of the system tend to destabilize any ordering. We show that in the present model, SkX can survive, albeit in a somewhat distorted form, in the impure infinite system up to a fairly large concentration of impurities, and, in the pure finite systems, down to sizes comprising merely tens of particles. Distortion of the SkX phase due to the formation of bimerons, reported in the ferromagnetic model, was not observed in the present frustrated AFM case. Full article
(This article belongs to the Special Issue Phase Change Material and Magnetic Research)
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10 pages, 2128 KiB  
Article
An Effect of Fe3+ Ion Substitution for Cr3+ in the Octahedral Sites of FeCr2O4 Multiferroic Spinel: Mössbauer Spectroscopy Study
by Almaz L. Zinnatullin, Mikhail A. Cherosov, Ruslan G. Batulin, Farit G. Vagizov and Roman V. Yusupov
Magnetochemistry 2023, 9(4), 98; https://doi.org/10.3390/magnetochemistry9040098 - 02 Apr 2023
Viewed by 1119
Abstract
We present the results of a successful synthesis and investigation of polycrystalline Fe2+(Cr3+, Fe3+)2O4 powder, where 1/8 part of the Cr3+ ions in the octahedral sites is substituted by the Fe3+ ones. [...] Read more.
We present the results of a successful synthesis and investigation of polycrystalline Fe2+(Cr3+, Fe3+)2O4 powder, where 1/8 part of the Cr3+ ions in the octahedral sites is substituted by the Fe3+ ones. It is shown that under such doping, the material retains the cubic spinel structure characteristic of the parent FeCr2O4 compound. However, the values of the critical temperatures have changed. Both the orbital and magnetic orderings occur at about 120 K, and magnetic structure rearrangement associated with an onset of spiral modulation takes place at 26 K. Mössbauer studies in a wide temperature range make it possible to accurately control the content of iron ions, their valence and magnetic states, and local environment, therefore, allowing a deeper understanding of the features of the revealed transformations. Full article
(This article belongs to the Special Issue Phase Change Material and Magnetic Research)
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10 pages, 2459 KiB  
Communication
Manipulation of the Martensitic Transformation and Exchange Bias Effect in the Ni45Co5Mn37In13 Ferromagnetic Shape Memory Alloy Films
by Jiahong Wen, Bochu Yang, Zhichao Dong, Yaxin Yan and Xiaoyu Zhao
Magnetochemistry 2023, 9(2), 51; https://doi.org/10.3390/magnetochemistry9020051 - 08 Feb 2023
Viewed by 1027
Abstract
The martensitic phase transition and exchange bias effect of the Ni-Mn-based ferromagnetic shape memory alloys (FSMAs) Ni45Co5Mn37In13 (Ni-Co-Mn-In) films are investigated in this paper. The martensitic transformation properties of the Ni-Co-Mn-In alloy target material are manipulated [...] Read more.
The martensitic phase transition and exchange bias effect of the Ni-Mn-based ferromagnetic shape memory alloys (FSMAs) Ni45Co5Mn37In13 (Ni-Co-Mn-In) films are investigated in this paper. The martensitic transformation properties of the Ni-Co-Mn-In alloy target material are manipulated by the process of electric arc melting, melt-fast quenching, and high-temperature thermal pressure. The Ni-Co-Mn-In alloy films with martensite phase transition characteristics are obtained by adjusting deposition parameters on the (001) MgO substrate, which shows a significant exchange bias (EB) effect at different temperatures. With increasing sputtering power and time, the film thickness increases, resulting in a gradual relaxation of the constraints at the interface between the film and the substrate (the interfacial strain decreases as the increase of thin film thickness), which promotes the martensite phase transition. Between zero-field cooling (ZFC) and field-cooled (FC) curve obvious division zone, the decrease of exchange bias field (HEB) and coercive force field (Hc) with an increase in test temperature is due to ferromagnetic (FM) interaction begins to dominate, resulting in a reduction of antiferromagnetic (AFM) anisotropy at the interface. The maximal HEB and Hc reach ~465.7 Oe and ~306.9 Oe at 5 K, respectively. The manipulation of the martensitic transformation and EB effect of the Ni-Co-Mn-In alloy films demonstrates potential application in the field of information and spintronics. Full article
(This article belongs to the Special Issue Phase Change Material and Magnetic Research)
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14 pages, 5430 KiB  
Article
Kinetics and the Effect of Thermal Treatments on the Martensitic Transformation and Magnetic Properties in Ni49Mn32Ga19 Ferromagnetic Shape Memory Ribbons
by Felicia Tolea, Bogdan Popescu, Cristina Bartha, Monica Enculescu, Mugurel Tolea and Mihaela Sofronie
Magnetochemistry 2023, 9(1), 7; https://doi.org/10.3390/magnetochemistry9010007 - 25 Dec 2022
Cited by 1 | Viewed by 1269
Abstract
In our work, the kinetics of martensitic transformations and the influence of thermal treatments on martensitic transformations, as well as the related magnetic properties of the Ni49Mn32Ga19 ferromagnetic shape memory melt-spun ribbons, have been investigated. Thermal treatments at [...] Read more.
In our work, the kinetics of martensitic transformations and the influence of thermal treatments on martensitic transformations, as well as the related magnetic properties of the Ni49Mn32Ga19 ferromagnetic shape memory melt-spun ribbons, have been investigated. Thermal treatments at 673 K for 1, 4 and 8 h can be considered an instrument for fine-tuning the performance parameters of alloys. One-hour thermal treatments promote an improvement in the crystallinity of these otherwise highly textured ribbons, reducing internal defects and stress induced by the melt-spinning technique. Longer thermal treatments induce an important magnetization rise concomitantly with a slight and continuous increase in martensitic temperatures and transformation enthalpy. The activation energy, evaluated from differential scanning calorimeter experimental data with a Friedman model, significantly increases after thermal treatments as a result of the multi-phase coexistence and stabilization of the non-modulated martensitic phase, which increases the reverse martensitic transformation hindrance. Full article
(This article belongs to the Special Issue Phase Change Material and Magnetic Research)
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8 pages, 756 KiB  
Article
Effect of Substrate on One-Dimensional Multiferroic Properties
by Ivan Maltsev and Igor Bychkov
Magnetochemistry 2022, 8(11), 158; https://doi.org/10.3390/magnetochemistry8110158 - 16 Nov 2022
Viewed by 1165
Abstract
We present a theoretical study of the substrate influence on the electrical and magnetic properties of a one-dimensional multiferroic. We used a one-dimensional axial next-nearest neighbor Ising model (1D ANNNI model). The effect of the substrate was modeled using the periodic Frenkel–Kontorova potential. [...] Read more.
We present a theoretical study of the substrate influence on the electrical and magnetic properties of a one-dimensional multiferroic. We used a one-dimensional axial next-nearest neighbor Ising model (1D ANNNI model). The effect of the substrate was modeled using the periodic Frenkel–Kontorova potential. It is shown that the periodic potential of the substrate reduces the polarization of the multiferroic at low temperatures. The substrate potential significantly affects the structural changes near the magnetic phase transition temperature. Full article
(This article belongs to the Special Issue Phase Change Material and Magnetic Research)
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8 pages, 2453 KiB  
Communication
Large Elastocaloric Effect Driven by Low Stress Induced in [001]-Oriented Polycrystalline Co51.6V31.4Ga17 Alloy
by Jian Liu, Jing He and Shengcan Ma
Magnetochemistry 2022, 8(8), 87; https://doi.org/10.3390/magnetochemistry8080087 - 09 Aug 2022
Cited by 3 | Viewed by 1641
Abstract
In this work, we have studied the elastocaloric effect in directionally solidified Co51.6V31.4Ga17 alloys with a strong [001] preferred orientation. The entropy change for thermal-induced martensitic transformation is determined as 19.6 J kg−1 K−1. The [...] Read more.
In this work, we have studied the elastocaloric effect in directionally solidified Co51.6V31.4Ga17 alloys with a strong [001] preferred orientation. The entropy change for thermal-induced martensitic transformation is determined as 19.6 J kg−1 K−1. The sample exhibits stress-induced martensitic transformation with a hysteresis of 46 MPa, and the superelasticity is also verified by the in situ X-ray diffraction method. According to the elastocaloric effect tests, a noticeable change in adiabatic temperature up to 12.2 K has been achieved at the strain of 6%. The specific temperature change upon the critical stress loading can be attained as 132 K MPa−1. In addition, the difference in the loading–unloading temperature change can be ascribed to the imperfect adiabatic environment. Full article
(This article belongs to the Special Issue Phase Change Material and Magnetic Research)
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