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| Giant Stress-Impedance Effect in Co71.8Fe4.9Nb0.8Si7.5B15 Amorphous Glass-Covered Wires |
| CHEN Zheng 1, 2, LI De-ren 1, 2, LU Zhi-chao 1, 2, ZHOU Shao-xiong 1, 2 |
| 1. Central Iron and Steel Research Institute, Beijing 100081, China; 2. Advanced Technology and Materials Co Ltd, Beijing 100081, China |
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Abstract The giant stress-impedance (GSI) effect in as-cast and DC current annealed Co71.8Fe4.9Nb0.8Si7.5B15 amorphous glass-covered wires is presented. The SI ratio of the as-cast sample exhibits negative GSI effect. For the sample annealed by 60 mA DC current, the SI ratio first increases with applied tensile stress, then decreases with the applied tensile stress. The maximum ��Z/Z ratio of 304% is obtained. Frequency dependence in the range from 1 to 110 MHz of the GSI effect is investigated. Experimental results show that the real part R and the imaginary part X of impedance play an important role at high frequency and low frequency, respectively. At 1 MHz, the maximum ��X/X of 1 448% is obtained. At 110 MHz, the maximum ��R/R ratio of 648% is obtained.
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Received: 01 January 1900
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2006, Vol. 1 