Univ. Grenoble Alpes, CNRS, Grenoble INP, G2ELab, 38000 Grenoble, France.
Sensors (Basel). 2018 Nov 24;18(12):4121. doi: 10.3390/s18124121.
In this paper, the torsional stress effect on Giant Magneto-Impedance (GMI) was studied in Co-rich amorphous wires. The study, which was conducted in the context of the development of a current clamp based on GMI, considered torsion as a parameter of the influence of this sensor. Both diagonal, Z, and off-diagonal, Z, components of the impedance tensor were investigated. The samples were Co-rich wires with a 100 µ diameter. The wires were twisted positive and negative angles with respect to a reference position. For each component of the impedance, the intrinsic sensitivity and offset were measured as a function of the rotation angle. The results showed that the sensitivity of the diagonal component at a given working point slightly increased for angles between -90° to +90°, whereas the sensitivity was almost constant for the off-diagonal component at zero-field. The intrinsic offset in the diagonal configuration was almost unchanged for the rotation angles considered, whereas this offset increased in the off-diagonal configuration. Furthermore, the GMI ratio of Z was also measured as a function of the rotation angle for comparison purposes with known data. The maximum of this ratio was obtained for a rotation angle of about 50°.
本文研究了富钴非晶丝中扭转应力对巨磁阻抗（GMI）的影响。该研究是在基于 GMI 的电流钳的开发背景下进行的，将扭转作为影响该传感器的一个参数进行了考虑。对角分量 Z 和非对角分量 Z'的阻抗张量都进行了研究。样品是直径为 100µm 的富钴丝。这些丝相对于参考位置正向和负向扭转一定角度。对于每个阻抗分量，作为旋转角度的函数测量了固有灵敏度和偏移。结果表明，在给定工作点处对角分量的灵敏度在-90°到+90°之间略有增加，而在零场时非对角分量的灵敏度几乎保持不变。在考虑的旋转角度范围内，对角配置中的固有偏移几乎保持不变，而在非对角配置中，偏移增加。此外，还测量了 Z 的 GMI 比作为旋转角度的函数，以便与已知数据进行比较。该比值的最大值是在旋转角度约为 50°时获得的。
