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|Title:||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.
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.|
|Citation:||Materials Chemistry And Physics. Elsevier Science Sa, v. 174, p. 23 - 27, 2016.|
|Appears in Collections:||IFGW - Artigos e Outros Documentos|
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