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Article

Magnetic and Magnetocaloric Effect of Laves Phase Compounds Er(Fe0.8−xMn0.2−yCox+y)2 with x, y = 0.0 or 0.1

by
Safa Othmani
1,
Ichrak Chaaba
2,
Sonia Haj-Khlifa
3,
Patricia de Rango
3 and
Daniel Fruchart
3,*
1
Unité de Recherche sur les Hétéro-Epitaxies et Applications, Faculté des Sciences de Monastir 5019, Université de Monastir, Monastir 5000, Tunisia
2
Laboratoire des Technologies des Systèmes Smart, C.R.I. Multimédia et Traitement Numérique des Données, Technopôle de Sfax, B.P 275, Sfax 3029, Tunisia
3
Institut Néel & Université Grenoble Alpes, B.P. 166, 38042 Grenoble CEDEX 9, France
*
Author to whom correspondence should be addressed.
Metals 2020, 10(9), 1247; https://doi.org/10.3390/met10091247
Submission received: 5 August 2020 / Revised: 5 September 2020 / Accepted: 7 September 2020 / Published: 16 September 2020
(This article belongs to the Special Issue Advanced Magnetic Materials)
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Abstract

Magnetic and magnetocaloric effect (MCE) of the Er(Fe0.8−xMn0.2−yCox+y)2 Laves phase-type compounds have been investigated. X-ray diffraction (XRD) analysis has revealed that these compounds crystallize with the C15 type Laves phase structure (Space Group Fd-3m). The magnetization curves indicate a ferri-magnetic-ordering resulting of the antiparallel coupling between the moments of the heavy rare earth Er and the transition metal (TM). The partial substitution of Fe/Mn by Co increases the Curie temperature from 355 K for Er(Fe0.8Mn0.2)2 to 475, 550, and 555 K for Er(Fe0.7Mn0.2Co0.1)2, Er(Fe0.8Mn0.1Co0.1)2, and Er(Fe0.7Mn0.1Co0.2)2, respectively. According to the nature of the TM elements, arguments were presented forwards either Molecular Field or Spin Fluctuation Theory, even Stoner type pictures should be considered for. MCE was calculated according to the Maxwell relation based on isotherm magnetization measurements. The magnetic entropy change (−∆SM) observed on a 300–400 K temperature range can be understood in terms of a Spin Fluctuation Theory picture supported by both the different magnetic polarization levels that were shared by the TM elements and the related interatomic exchange forces.
Keywords: R(TM)2 compounds; X-Ray diffraction; magnetic properties; magnetocaloric effect R(TM)2 compounds; X-Ray diffraction; magnetic properties; magnetocaloric effect

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MDPI and ACS Style

Othmani, S.; Chaaba, I.; Haj-Khlifa, S.; de Rango, P.; Fruchart, D. Magnetic and Magnetocaloric Effect of Laves Phase Compounds Er(Fe0.8−xMn0.2−yCox+y)2 with x, y = 0.0 or 0.1. Metals 2020, 10, 1247. https://doi.org/10.3390/met10091247

AMA Style

Othmani S, Chaaba I, Haj-Khlifa S, de Rango P, Fruchart D. Magnetic and Magnetocaloric Effect of Laves Phase Compounds Er(Fe0.8−xMn0.2−yCox+y)2 with x, y = 0.0 or 0.1. Metals. 2020; 10(9):1247. https://doi.org/10.3390/met10091247

Chicago/Turabian Style

Othmani, Safa, Ichrak Chaaba, Sonia Haj-Khlifa, Patricia de Rango, and Daniel Fruchart. 2020. "Magnetic and Magnetocaloric Effect of Laves Phase Compounds Er(Fe0.8−xMn0.2−yCox+y)2 with x, y = 0.0 or 0.1" Metals 10, no. 9: 1247. https://doi.org/10.3390/met10091247

APA Style

Othmani, S., Chaaba, I., Haj-Khlifa, S., de Rango, P., & Fruchart, D. (2020). Magnetic and Magnetocaloric Effect of Laves Phase Compounds Er(Fe0.8−xMn0.2−yCox+y)2 with x, y = 0.0 or 0.1. Metals, 10(9), 1247. https://doi.org/10.3390/met10091247

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