Temperature dependence of the magnetomechanical effect in metal-bonded cobalt ferrite composites under torsional strain

被引:39
作者
Chen, Y [1 ]
Snyder, JE
Dennis, KW
McCallum, RW
Jiles, DC
机构
[1] Iowa State Univ Sci & Technol, Ames Lab, Ames, IA 50011 USA
[2] Iowa State Univ Sci & Technol, Dept Mat Sci & Engn, Ames, IA 50011 USA
关键词
D O I
10.1063/1.372526
中图分类号
O59 [应用物理学];
学科分类号
摘要
Metal-bonded cobalt ferrite composites are promising candidates for torque sensors and other magnetostrictive sensing and actuating applications. In the present study, the temperature dependence of the magnetomechanical effect in a ring-shape cobalt ferrite composite under torsional strain has been investigated in the temperature range of -37 to 90 degrees C. The changes of external axial magnetic field were measured as a function of applied torque. Magnetomechanical sensitivity of Delta H-ext/Delta tau=65 A N-1 m(-2) was observed with a magnetomechanical hysteresis of Delta tau=+/- 0.62 N m at room temperature (22 degrees C). These were then measured as a function of temperature. Both decreased as the temperature increased throughout the entire range. The magnetomechanical hysteresis became negligible at temperatures higher than 60 degrees C, above which there was a linear change in external magnetic field with applied torque. These temperature dependences are explained by the changes of magnetostriction, anisotropy, spontaneous magnetization, and pinning of domain walls caused by the availability of increased thermal energy. (C) 2000 American Institute of Physics. [S0021- 8979(00)94408-6].
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页码:5798 / 5800
页数:3
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