Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/329658
Type: Artigo
Title: Experimental Evidences Of Enhanced Magnetocaloric Properties At Room Temperature And Half-metallicity On Fe2mnsi-based Heusler Alloys
Experimental evidences of enhanced magnetocaloric properties at room temperature and half-metallicity on Fe2MnSi-based Heusler alloys
Author: Caraballo Vivas, R. J.
Pedro, S. S.
Cruz, C.
Tedesco, J. C. G.
Coelho, A. A.
Carvalho, A. Magnus G.
Rocco, D. L.
Reis, M. S.
Abstract: Heusler alloys are widely studied due to their interesting structural and magnetic properties, like magnetic shape memory ability, coupled magneto-structural phase transitions and half-metallicity; ruled, for many cases, by the valence electrons number (N-v). The present work focuses on the magnetocaloric potentials of half-metals, exploring the effect of N-v on the magnetic entropy change, preserving half-metallicity. The test bench is the Si-rich side of the half-metallic series Fe2MnSi1-xGax. From the obtained experimental results it was possible to propose vertical bar Delta S vertical bar(max) = Delta H-0.8 (alpha + beta N-v), i.e., the maximum magnetic entropy change depends in a linear fashion on N-v, weighted by a power law on the magnetic field change Delta H (alpha and beta are constants experimentally determined). This phenomenological model opens doors for further theoretical investigations. In addition, it was also possible to predict a new multifunctional Heusler alloy, with enhanced magnetocaloric effect, Curie temperature close to 300 K and half-metallicity. (C) 2016 Elsevier B.V. All rights reserved.
Heusler alloys are widely studied due to their interesting structural and magnetic properties, like magnetic shape memory ability, coupled magneto-structural phase transitions and half-metallicity, ruled, for many cases, by the valence electrons number (N-v). The present work focuses on the magnetocaloric potentials of half-metals, exploring the effect of N-v on the magnetic entropy change, preserving half-metallicity. The test bench is the Si-rich side of the half-metallic series Fe2MnSi1-xGax. From the obtained experimental results it was possible to propose vertical bar Delta S vertical bar(max) = Delta H-0.8 (alpha + beta N-v), i.e., the maximum magnetic entropy change depends in a linear fashion on N-v, weighted by a power law on the magnetic field change Delta H (alpha and beta are constants experimentally determined). This phenomenological model opens doors for further theoretical investigations. In addition, it was also possible to predict a new multifunctional Heusler alloy, with enhanced magnetocaloric effect, Curie temperature close to 300 K and half-metallicity.
Subject: Alloys
Intermetallic Compounds
Magnetic Materials
Magnetometer
Magnetic Properties
Thermodynamic Properties
Ligas (Metalurgia), Compostos intermetálicos, Materiais magnéticos, Magnetômetros, Propriedades magnéticas
Country: Holanda
Editor: Elsevier
Citation: Materials Chemistry And Physics. Elsevier Science Sa, v. 174, p. 23 - 27, 2016.
Rights: fechado
Identifier DOI: 10.1016/j.matchemphys.2016.02.045
Address: https://www.sciencedirect.com/science/article/pii/S025405841630116X
Date Issue: 2016
Appears in Collections:IFGW - Artigos e Outros Documentos

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