Influence of the atomic order on the magnetic characteristics of a Ni-Mn-Ga ferromagnetic shape memory alloy

被引：24
|
作者：
Sanchez-Alarcos, V. [1 ]
Perez-Landazabal, J. I. [1 ]
Gomez-Polo, C. [1 ]
Recarte, V. [1 ]
机构：
[1] Univ Publ Navarra, Dept Fis, Pamplona 31006, Spain
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2008年 / 320卷 / 14期
关键词：
Ni-Mn-Ga ferromagnetic shape memory alloy; atomic order; martensitic transformation; magnetic characteristics;
D O I：
10.1016/j.jmmm.2008.02.039
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The influence of the atomic order on the magnetic properties has been analyzed in a polycrystalline Ni49.5Mn28.5Ga22 ferromagnetic shape memory alloy prepared by arc melting under Ar atmosphere. Different thermal treatments have been performed to modify the order degree of the alloy. The effect of the different thermal treatments on the magnetic and structural characteristics has been analyzed by superconducting quantum interference device (SQUID) and differential scanning calorimetry (DSC) measurements. The magnetic and structural properties of the alloys are modified as a consequence of the atomic order change. The martensitic transformation temperatures increase as long as the order degree increases. On the other side, the Curie temperature and magnetization saturation also reflect the order degree of the alloy but seems to be linked to the particular order of the Mn sub-lattice. (c) 2008 Elsevier B.V. All rights reserved.
引用
收藏
页码：E160 / E163
页数：4
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