Magnetic-field induced shape memory effect in Ni2MnGa sputtered films

被引：32

作者：

Ohtsuka, M ^{[1
]}

Sanada, M ^{[1
]}

Matsumoto, M ^{[1
]}

Itagaki, K ^{[1
]}

机构：

[1] Tohoku Univ, Aoba Ku, Sendai, Miyagi 9808577, Japan

来源：

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING | 2004年 / 378卷 / 1-2期

关键词：

nickel-manganese-gallium; ferromagnetic shape memory alloy; sputtered film; shape memory effect; magnetic field; constraint-aging;

D O I：

10.1016/j.msea.2003.11.077

中图分类号：

TB3 [工程材料学];

学科分类号：

0805 ; 080502 ;

摘要：

The shape memory effect (SME) by magnetic field is interesting and important for physics and application. The Ni2MnGa films were deposited on a poly-vinyl alcohol (PVA) substrate with a radio-frequency (RF) magnetron sputtering apparatus using Ni52Mn24Ga24 or Ni52.5Mn22Ga25.5 target. After separating from the substrate, the films were heat-treated at 1073 K for 36 ks for homogenization and ordering. They were constrained in a silica tube and heated at 673 K for 14.4 and 57.6 ks. The two-way SME for each constraint-aged film was confirmed by thermal cycling. The shape change of film under magnetic field was observed at constant temperature between A(s)(*) and A(f)(*), or M-s(*) and M-f(*). Magnetic field was applied parallel to the film surface up to 5 T using a super-conductor magnet. These films showed the SME by magnetic field. The strain by magnetic field was dependent on the measurement temperature. At temperatures between M-s(*) and M-f(*), the strain increased with increasing magnetic field and slightly decreased with decreasing magnetic field. The martensitic transformation was induced by the magnetic field up to 5 T, which corresponds to that observed by cooling down to about 4 K. (C) 2004 Elsevier B.V. All rights reserved.

引用

页码：377 / 383

页数：7

共 13 条

[1] Shape memory effect of sputtered Ni-rich Ni2MnGa alloy films aged in constraint condition [J].