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Magnetochemistry
Special Issues
Advance of Magnetocaloric Effect and Materials
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Advance of Magnetocaloric Effect and Materials

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

Deadline for manuscript submissions: 31 March 2025 | Viewed by 1534

Special Issue Editor

Prof. Dr. Lotfi Bessais

E-Mail Website
Guest Editor
Institut de Chimie et des Matériaux Paris-Est, ICMPE–CNRS, 94320 Thiais, France
Interests: solid state physics; magnetic nanomatrials; magnetocaloric materials; multifunctional magnetic materials; permanent magnets; intermetallic compounds; superparamagnetism
Special Issues, Collections and Topics in MDPI journals

Special Issue Information

Dear Colleagues,

The aim of this Special Issue is to give the opportunity to researchers working in fields related to the advancement of magnetocaloric effects and materials to submit review papers, full articles, and short communications.

In last recent years, magnetic refrigeration at room temperature has seen renewed interest thanks to the development of new materials with enhanced magnetocaloric effects and new thermal engineering techniques. High potential efficiency and environmental compatibility make magnetic refrigeration competitive as an alternative to conventional technologies based on the compression–evaporation cycle. New magnetocaloric materials for solid-state caloric refrigeration are emerging, and their various applications demonstrate that they are essential in our everyday lives. Thus, these magnetocaloric materials play important roles in addressing today's challenges, particularly those concerning fossil fuel consumption and climate change.

This Issue represents the state of the art in the field of new magnetocaloric materials and new cooling techniques. The aim is to highlight the latest developments in the shaping of magnetocaloric materials. Researchers are therefore invited to present all their original scientific and technical articles of experimental and theoretical studies on a wide range of materials and processes. Topics should include magnetocaloric materials, systems and applications in heating, cooling, and energy conversion.

Prof. Dr. Lotfi Bessais
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 2200 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

  • magnetocaloric effect
  • theoretical prediction
  • magnetocaloric materials
  • magnetic refrigeration
  • energy conversion
  • heat pumps

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Published Papers (2 papers)

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Research

16 pages, 6066 KiB  
Article
Ni50Mn37.5Sn12.5 Heusler Alloy: Influence of Co Addition on the Structure, Martensitic Transition, and Magnetic Properties
by Ahlem Bekhouche, Safia Alleg, Karima Dadda, Benilde F. O. Costa, Asma Wederni and Joan-Josep Suñol
Magnetochemistry 2024, 10(8), 59; https://doi.org/10.3390/magnetochemistry10080059 - 15 Aug 2024
Viewed by 397
Abstract
The impact of Co-addition (x = 0, 2, 4, and 6 at. %) in the as-cast and annealed Ni50Mn37.5Sn12.5 Heusler alloy at 900 °C for 24 h on the microstructure, magnetic properties, and the martensitic transition was studied [...] Read more.
The impact of Co-addition (x = 0, 2, 4, and 6 at. %) in the as-cast and annealed Ni50Mn37.5Sn12.5 Heusler alloy at 900 °C for 24 h on the microstructure, magnetic properties, and the martensitic transition was studied using X-ray diffraction (XRD), scanning electron microscopy, vibrating sample magnetometry, and differential scanning calorimetry. The crystal structure of as-cast samples consists of a 14M modulated martensite structure, a face-centered (FCC) γ phase, and a face-centered tetragonal (FCT) MnNi-type phase L10. The as-cast samples show a dendritic microstructure with different contrasts and non-uniform distribution. The annealed samples exhibit dual 14M and γ phases for the Co0 and Co2, but 14M + γ + MnNi for the Co4 and Co6. The appearance of the martensitic transformation in the annealed Co0 and Co2 samples can be due to the disappearance of the dendritic microstructure. The characteristic temperatures (martensite start, Ms; martensite finish, Mf; austenite start, As; and austenite finish, Af) decrease with Co addition. A ferromagnetic-like order exists at a lower temperature of 1.8 K for the as-cast and annealed samples and decreases at 300 K. The annealing increases the fraction of the AFM contributions at 300 K. The exchange bias values of the Co0, An-Co2, and An-Co6 are 146.7 Oe, 24 O2, and 32.6 Oe, respectively, at 300 K. Full article
(This article belongs to the Special Issue Advance of Magnetocaloric Effect and Materials)
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21 pages, 5494 KiB  
Article
Band Structure Calculations, Magnetic Properties and Magnetocaloric Effect of GdCo1.8M0.2 Compounds with M = Fe, Mn, Cu, Al
by Gabriela Souca, Roxana Dudric, Karsten Küpper, Coriolan Tiusan and Romulus Tetean
Magnetochemistry 2024, 10(8), 53; https://doi.org/10.3390/magnetochemistry10080053 - 24 Jul 2024
Viewed by 676
Abstract
The magnetic properties, band structure results, and magnetocaloric effect of GdCo1.8M0.2 with M = Fe, Mn, Cu, and Al are reported. The band structure calculations demonstrate that all the samples have a ferrimagnetically ordered ground state, in perfect agreement with [...] Read more.
The magnetic properties, band structure results, and magnetocaloric effect of GdCo1.8M0.2 with M = Fe, Mn, Cu, and Al are reported. The band structure calculations demonstrate that all the samples have a ferrimagnetically ordered ground state, in perfect agreement with the magnetic measurements. Calculated magnetic moments and variation with the alloy composition are strongly influenced by hybridisation mechanisms as sustained by an analysis of the orbital projected local density of states. The XPS measurements reveal no significant shift in the binding energy of the investigated Co core levels with a change in the dopant element. The Co 3s core-level spectra gave us direct evidence of the local magnetic moments on Co sites and an average magnetic moment of 1.3 µB/atom was found, being in good agreement with the theoretical estimation and magnetic measurements. From the Mn 3s core-level spectra, a value of 2.1 µB/Mn was obtained. The symmetric shapes of magnetic entropy changes, the Arrott plots, and the temperature dependence of Landau coefficients clearly indicate a second-order phase transition. The relative cooling power, RCP(S), normalized relative cooling power, RCP(∆S)/∆B, and temperature-averaged entropy change values indicate that these compounds could be promising candidates for applications in magnetic refrigeration devices. Full article
(This article belongs to the Special Issue Advance of Magnetocaloric Effect and Materials)
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