Please use this identifier to cite or link to this item: http://repositorio.unicamp.br/jspui/handle/REPOSIP/77504
Type: Artigo
Title: Anisotropic magnetocaloric effect in ErGa2 and HoGa2 single-crystals
Author: Reis, R. D. dos
Silva, L. M. da
Santos, A. O. dos
Medina, A. M. N.
Cardoso, L. P.
Gandra, F. C. G.
Abstract: In this work we study the anisotropic magnetocaloric properties of ErGa2 and HoGa2 single-crystals. Both compounds present antiferromagnetic ordering below 10 K but with different easy axis as a result of the crystal field anisotropy. The single-crystal conventional MCE values are similar or in certain circumstances even larger than the results for the polycrystalline material. The anisotropic MCE was calculated by taking the difference of the entropy change of the easy and hard magnetization directions. For both compounds, the anisotropic variation of entropy is as large as the conventional entropy change obtained by sweeping the magnetic field up to 5 T. Particularly for ErGa2 an inverse MCE for a 3 T field oriented along the easy axis is obtained with similar magnitude of the 5 T MCE found for polycrystalline samples. The results show that by exploring anisotropic properties of the materials it is possible to obtain a significant MCE. From a technological point of view this can be an interesting alternative because the MCE is produced just by rotating the magnetic material under a constant magnetic field. (c) 2013 Elsevier B.V. All rights reserved.
In this work we study the anisotropic magnetocaloric properties of ErGa2 and HoGa2 single-crystals. Both compounds present antiferromagnetic ordering below 10 K but with different easy axis as a result of the crystal field anisotropy. The single-crystal conventional MCE values are similar or in certain circumstances even larger than the results for the polycrystalline material. The anisotropic MCE was calculated by taking the difference of the entropy change of the easy and hard magnetization directions. For both compounds, the anisotropic variation of entropy is as large as the conventional entropy change obtained by sweeping the magnetic field up to 5 T. Particularly for ErGa2 an inverse MCE for a 3 T field oriented along the easy axis is obtained with similar magnitude of the 5 T MCE found for polycrystalline samples. The results show that by exploring anisotropic properties of the materials it is possible to obtain a significant MCE. From a technological point of view this can be an interesting alternative because the MCE is produced just by rotating the magnetic material under a constant magnetic field.
Subject: Anisotropia
Efeito magnetocalórico
Compostos intermetálicos
Materiais magnéticos
Country: Holanda
Editor: Elsevier
Citation: Journal Of Alloys And Compounds. Elsevier Science Sa, v. 582, n. 461, n. 465, 2014.
Rights: fechado
Identifier DOI: 10.1016/j.jallcom.2013.08.023
Address: https://www.sciencedirect.com/science/article/pii/S0925838813018690
Date Issue: 2014
Appears in Collections:IFGW - Artigos e Outros Documentos

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