Theoretical investigations on magnetic entropy change in amorphous and crystalline systems: Applications to RAg (R=Tb, Dy, Ho) and GdCuAl

被引：7

作者：

von Ranke, P. J. ^{[1
]}

Nobrega, E. P. ^{[1
]}

Caldas, A. ^{[2
]}

Alho, B. P. ^{[3
]}

Ribeiro, P. O. ^{[1
]}

Alvarenga, T. S. T. ^{[1
]}

Lopes, P. H. O. ^{[1
]}

de Sousa, V. S. R. ^{[1
]}

Carvalho, A. Magnus G. ^{[4
]}

de Oliveira, N. A. ^{[1
]}

机构：

[1] Univ Estado Rio de Janeiro UERJ, Inst Fis, BR-20550013 Rio De Janeiro, Brazil

[2] Soc Unificada Ensino Super & Cultura, BR-20211351 Rio De Janeiro, RJ, Brazil

[3] Univ Estado Rio de Janeiro, Inst Aplicacao Fernando Rodrigues da Silveira, BR-20260232 Rio De Janeiro, RJ, Brazil

[4] CNPEM, Lab Nacl Luz Sincrotron, BR-13083970 Campinas, SP, Brazil

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2014年 / 369卷

基金：

巴西圣保罗研究基金会;

关键词：

Magnetocaloric effect; Rare earth transition metals amorphous; Crystaline electrical field anisotropy; PHASE-TRANSITION; ALLOYS;

D O I：

10.1016/j.jmmm.2014.06.026

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

We report theoretical investigations on the magnetic entropy changes in amorphous systems through two different assumptions. In the first assumption, the HPZ-anisotropic model is considered to deal with the random direction of magnetic moments, where the amorphous RAg (R=Tb, Dy and Ho) were used as prototypes systems. In the second assumption, the amorphisation is parameterized through the exchange interaction distribution and GdCuAl, in amorphous and crystalline structures, were considered as prototypes systems. Comparisons between the magnetic entropy changes under amorphisation and under the usual magnetic field variation were performed. The model reveals the dependence of refrigerant capacity on the amorphisation parameter, and an optimum amorphisation parameter was calculated. (C) 2014 Elsevier B.V. All rights reserved

引用

页码：34 / 39

页数：6

共 10 条

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