Magnetocaloric and shape-memory effects in Ni-Mn-Ga ferro-magnetic alloys

被引：2
|
作者：
Marcos, J
Mañosa, L
Planes, A
Casanova, F
Batlle, X
Labarta, A
Matínez, B
机构：
[1] Univ Barcelona, Fac Fis, Dept Estructura & Constituents Mat, E-08028 Barcelona, Catalonia, Spain
[2] CSIC, Inst Ciencia Mat Barcelona, Bellaterra 080193, Spain
[3] Univ Barcelona, Fac Fis, Dept Fis Fonamental, E-08028 Barcelona, Spain
来源：
JOURNAL DE PHYSIQUE IV | 2004年 / 115卷
关键词：
D O I：
10.1051/jp4:2004115013
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
We show that an isothermal entropy change can be induced in Ni-Mn-Ga by the application of moderate magnetic fields. This magnetocaloric effect is originated by two different contributions: (i) the magnetostructural coupling which takes place at the length scale of martensitic variants and magnetic domains (mesoscopic coupling) and (ii) the microscopic spin-phonon coupling. The first contribution is intimately related to the magnetic shape-memory property and controls the magnetocaloric effect for small inducing fields. The latter contribution is dominant for high fields.
引用
收藏
页码：105 / 110
页数：6
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