Martensitic transformations in Ni-Mn-Ga sputtered films

被引：8
作者：
Dubowik, J.
Goscianska, I.
机构：
[1] Polish Acad Sci, Inst Mol Phys, PL-60179 Poznan, Poland
[2] Adam Mickiewicz Univ, Dept Phys, PL-61614 Poznan, Poland
来源：
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2007年 / 316卷 / 02期
关键词：
shape memory alloy; martensitic transformation; magnetic film;
D O I：
10.1016/j.jmmm.2007.03.033
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
We have investigated structure, magnetic and electrical properties, and thermal shape memory effect in Ni-Mn-Ga films. The Ni49Mn29.6Ga21.4 and Ni56.4Mn21.8Ga21.8 films have been chosen for further characterization since they had revealed the presence of martensitic transformations (MT) with the martensitic start (M-s) and finish (M-f) temperatures below (M-s=310 K, M-f=260 K) and above (M-s=420 K, M-f=330 K) the Curie temperature 365 and 350 K, respectively. The Ni49Mn29.6Ga21.4 and Ni56.4Mn21.8Ga21.8 films at room temperature have cubic and mixed tetragonal-cubic structures, respectively. An anomalous behavior of the ferromagnetic resonance due to an increase in the magnetic anisotropy in the martensitic phase has been observed. MT in both films has been manifested as a considerable jump (of similar to 10%) in electrical resistance and decrease in effective magnetization. For Ni56.4Mn21.8Ga21.8 films, the shape memory effect has been evaluated from observations of shape recovery of the curled films portions separated from the mica substrates. (c) 2007 Elsevier B.V. All rights reserved.
引用
收藏
页码：E599 / E602
页数：4
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