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Type: Artigo de periódico
Title: Experimental Evidences Of Enhanced Magnetocaloric Properties At Room Temperature And Half-metallicity On Fe2mnsi-based Heusler Alloys
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 (Nv). The present work focuses on the magnetocaloric potentials of half-metals, exploring the effect of Nv 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 |ΔS|max=ΔH0.8(α+βNv), i.e., the maximum magnetic entropy change depends in a linear fashion on Nv, weighted by a power law on the magnetic field change ΔH (α and β 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. © 2016 Elsevier B.V. All rights reserved.
Editor: Elsevier Ltd
Citation: Materials Chemistry And Physics. Elsevier Ltd, v. 174, p. 23 - 27, 2016.
Rights: fechado
Identifier DOI: 10.1016/j.matchemphys.2016.02.045
Date Issue: 2016
Appears in Collections:Unicamp - Artigos e Outros Documentos

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