Temperature dependence of the magnetic-field-induced strain of NiMnGa in the presence of an acoustic drive

被引:11
|
作者
Peterson, Bradley W. [1 ]
Allen, Samuel M. [1 ]
O'Handley, Robert C. [1 ]
机构
[1] MIT, Dept Mat Sci & Engn, Cambridge, MA 02139 USA
关键词
Acoustic signals - Field-induced strain - Magnetic field-induced strain - Small amplitude - Start temperature - Strain response - Temperature dependence - Twin boundaries;
D O I
10.1063/1.2824895
中图分类号
O59 [应用物理学];
学科分类号
摘要
A small amplitude acoustic signal was applied to a Ni-Mn-Ga single crystal. The effect of the acoustic signal in enhancing the magnetic-field-induced strain was measured as a function of temperature over the range of 1-35 degrees C below the austenite-start temperature. Strain output was found to decrease with decreasing temperature as a result of lowered twin-boundary mobility. The combination of a piezoelectric drive with the magnetic drive yields an improvement in strain response for all temperatures investigated; however, the piezoenhanced, field-induced strain is maximized at 12.5 degrees C, where partial derivative epsilon/partial derivative T is maximum. (c) 2008 American Institute of Physics.
引用
收藏
页数:4
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