The effect of field cooling and field orientation on the martensitic phase transformation in a Ni2MnGa single crystal

被引:29
作者
Chu, SY [1 ]
Cramb, A [1 ]
De Graef, M [1 ]
Laughlin, D [1 ]
McHenry, ME [1 ]
机构
[1] Carnegie Mellon Univ, Dept Mat Sci & Engn, Pittsburgh, PA 15213 USA
关键词
D O I
10.1063/1.372519
中图分类号
O59 [应用物理学];
学科分类号
摘要
The temperature and field dependence of the magnetization in a Ni2MnGa single crystal was measured using a magnetometer with an applied field oriented in the [001] and [011] directions, respectively, of the parent cubic phase. It was found that the magnetic field magnitude and direction could be used to determine the magnetization of the sample during a thermal transformation from the austenitic phase to the martensite phase. This is explained in terms of a magnetic field induced growth of the twin variant having a favorable orientation to the external magnetic field. A model to interpret the magnetic response in terms of aligned twin variants in the shape memory material is discussed. (C) 2000 American Institute of Physics. [S0021-8979(00)93208-0].
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页码:5777 / 5779
页数:3
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