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Entropy
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Thermodynamics and Phase Transitions in Magnetic Materials
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Thermodynamics and Phase Transitions in Magnetic Materials

A special issue of Entropy (ISSN 1099-4300). This special issue belongs to the section "Thermodynamics".

Deadline for manuscript submissions: closed (25 August 2021) | Viewed by 6580

Special Issue Editors

Prof. Dr. Luana Caron

E-Mail Website
Guest Editor
Faculty of Physics, Bielefeld University, 33615 Bielefeld, Germany
Interests: magnetism; magnetocaloric effect; transition metal based materials; phase transitions; high pressure
Dr. Francesco Cugini

E-Mail Website
Assistant Guest Editor
Department of Mathematical, Physical and Computer Sciences, University of Parma, 43124 Parma, Italy
Interests: magnetic materials; magnetocaloric effect; energy conversion; intermetallic compounds; ferroelectric materials
Dr. Xuefei Miao

E-Mail Website
Assistant Guest Editor
School of Materials Science and Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
Interests: magnetocaloric; calorics; phase transitions; neutron scattering; muon spectroscopy

Special Issue Information

Dear Colleagues,

Several interesting and useful phenomena take place around magnetic phase transitions. For example, magnetic shape memory due to magnetostructural coupling in martensites may be exploited in sensors and actuators, large entropy and temperature changes in magnetocaloric materials may be used for heat pumping and power conversion, permanent magnets and superconductors are extensively utilized in several applications, from generators to laboratory devices to MRIs, etc. Understanding the mechanisms behind different types of magnetic phase transitions is of great importance, not only from a scientific point of view but also for applications. Understanding the interplay between magnetic, structural, and electronic degrees of freedom is the first step toward designing better materials with optimized functional properties for applications.

In this issue, we would specially like to address the thermodynamic description of magnetic phase transitions which give rise to a variety of phenomena. Additionally, within the scope of this Special Issue are the design of novel thermomagnetic cycles and simulation of materials functional properties for, e.g., magnetic refrigeration.

Specific topics of interest include, amongst others:

  • Magnetocaloric and multicaloric effects;
  • Magnetic shape memory;
  • Permanent magnets;
  • Magnetostructural coupling;
  • Hall effects;
  • Superconductivity;
  • Magnetostriction;
  • Magnetic nanoparticles;
  • Negative thermal expansion.

Prof. Dr. Luana Caron
Dr. Francesco Cugini
Dr. Xuefei Miao
Guest Editors

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. Entropy 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 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

  • magnetic phase transitions
  • magnetocaloric effect
  • magnetic shape memory
  • magnetostructural coupling
  • Hall effects
  • superconductivity
  • permanent magnets
  • high pressure

Published Papers (3 papers)

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Research

12 pages, 13110 KiB  
Article
Magnetic Phase Diagram of the MnxFe2−xP1−ySiy System
by Xinmin You, Michael Maschek, Niels Harmen H. van Dijk and Ekkes Brück
Entropy 2022, 24(1), 2; https://doi.org/10.3390/e24010002 - 21 Dec 2021
Cited by 6 | Viewed by 2101
Abstract
The phase diagram of the magnetocaloric MnxFe2−xP1−ySiy quaternary compounds was established by characterising the structure, thermal and magnetic properties in a wide range of compositions (for a Mn fraction of 0.3 ≤ x < [...] Read more.
The phase diagram of the magnetocaloric MnxFe2−xP1−ySiy quaternary compounds was established by characterising the structure, thermal and magnetic properties in a wide range of compositions (for a Mn fraction of 0.3 ≤ x < 2.0 and a Si fraction of 0.33 ≤ y ≤ 0.60). The highest ferromagnetic transition temperature (Mn0.3Fe1.7P0.6Si0.4, TC = 470 K) is found for low Mn and high Si contents, while the lowest is found for low Fe and Si contents (Mn1.7Fe0.3P0.6Si0.4, TC = 65 K) in the MnxFe2−xP1−ySiy phase diagram. The largest hysteresis (91 K) was observed for a metal ratio close to Fe:Mn = 1:1 (corresponding to x = 0.9, y = 0.33). Both Mn-rich with high Si and Fe-rich samples with low Si concentration were found to show low hysteresis (≤2 K). These compositions with a low hysteresis form promising candidate materials for thermomagnetic applications. Full article
(This article belongs to the Special Issue Thermodynamics and Phase Transitions in Magnetic Materials)
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10 pages, 671 KiB  
Article
Direct and Indirect Determination of the Magnetocaloric Effect in the Heusler Compound Ni1.7Pt0.3MnGa
by Ricardo D. dos Reis, Luana Caron, Sanjay Singh, Claudia Felser and Michael Nicklas
Entropy 2021, 23(10), 1273; https://doi.org/10.3390/e23101273 - 29 Sep 2021
Cited by 4 | Viewed by 2021
Abstract
Magnetic shape-memory materials are potential magnetic refrigerants, due the caloric properties of their magnetic-field-induced martensitic transformation. The first-order nature of the martensitic transition may be the origin of hysteresis effects that can hinder practical applications. Moreover, the presence of latent heat in these [...] Read more.
Magnetic shape-memory materials are potential magnetic refrigerants, due the caloric properties of their magnetic-field-induced martensitic transformation. The first-order nature of the martensitic transition may be the origin of hysteresis effects that can hinder practical applications. Moreover, the presence of latent heat in these transitions requires direct methods to measure the entropy and to correctly analyze the magnetocaloric effect. Here, we investigated the magnetocaloric effect in the Heusler material Ni1.7Pt0.3MnGa by combining an indirect approach to determine the entropy change from isofield magnetization curves and direct heat-flow measurements using a Peltier calorimeter. Our results demonstrate that the magnetic entropy change ΔS in the vicinity of the first-order martensitic phase transition depends on the measuring method and is directly connected with the temperature and field history of the experimental processes. Full article
(This article belongs to the Special Issue Thermodynamics and Phase Transitions in Magnetic Materials)
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11 pages, 3130 KiB  
Article
The Influence of Martensitic Intercalations in Magnetic Shape Memory NiCoMnAl Multilayered Films
by Andreas Becker, Daniela Ramermann, Inga Ennen, Björn Büker, Tristan Matalla-Wagner, Martin Gottschalk and Andreas Hütten
Entropy 2021, 23(4), 462; https://doi.org/10.3390/e23040462 - 14 Apr 2021
Cited by 4 | Viewed by 1753
Abstract
Hysteresis and transformation behavior were studied in epitaxial NiCoMnAl magnetic shape memory alloy thin films with varying number martensitic intercalations (MIs) placed in between. MIs consists of a different NiCoMnAl composition with a martensitic transformation occurring at much higher temperature than the host [...] Read more.
Hysteresis and transformation behavior were studied in epitaxial NiCoMnAl magnetic shape memory alloy thin films with varying number martensitic intercalations (MIs) placed in between. MIs consists of a different NiCoMnAl composition with a martensitic transformation occurring at much higher temperature than the host composition. With increasing number of intercalations, we find a decrease in hysteresis width from 17 K to 10 K. For a large difference in the layers thicknesses this is accompanied by a larger amount of residual austenite. If the thicknesses become comparable, strain coupling between them dominates the transformation process, which manifests in a shift of the hysteresis to higher temperatures, splitting of the hysteresis in sub hysteresis and a decrease in residual austenite to almost 0%. A long-range ordering of martensite and austenite regions in the shape of a 3D checker board pattern is formed at almost equal thicknesses. Full article
(This article belongs to the Special Issue Thermodynamics and Phase Transitions in Magnetic Materials)
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