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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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000373865700004.pdf | 1.56 MB | Adobe PDF | View/Open |
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