Anisotropic magnetocaloric effect in ErGa2 and HoGa2 single-crystals

被引：21
作者：
dos Reis, R. D. [1 ]
da Silva, L. M. [2 ]
dos Santos, A. O. [2 ]
Medina, A. M. N. [3 ]
Cardoso, L. P. [1 ]
Gandra, F. C. G. [1 ]
机构：
[1] Univ Estadual Campinas UNICAMP, Inst Fis Gleb Wataghin, BR-13083859 Campinas, SP, Brazil
[2] Univ Fed Maranhao UFMA, CCSST, BR-65900000 Imperatriz, MA, Brazil
[3] Univ Estadual Maringa, Dept Fis, BR-87020900 Maringa, PR, Brazil
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2014年 / 582卷
基金：
巴西圣保罗研究基金会;
关键词：
Anisotropic; Magnetocaloric; Intermetallics; Magnetic materials; ROOM-TEMPERATURE; MAGNETIC REFRIGERATION;
D O I：
10.1016/j.jallcom.2013.08.023
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
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.
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收藏
页码：461 / 465
页数：5
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