Abstract
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, Z11, and off-diagonal, Z21, 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 Z11 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°.
Highlights
Giant Magneto-Impedance (GMI) is a significant change of the impedance of some soft magnetic materials when they are subjected to an external magnetic field
The GMI effect is investigated for the realization of magnetic sensors
This concerns the use of GMI to realize a toroidal current clamp, which is mechanically flexible and which allows for both DC and AC measurements with the same sensitive element
Summary
Giant Magneto-Impedance (GMI) is a significant change of the impedance of some soft magnetic materials when they are subjected to an external magnetic field. The work presented in this paper, which deals with the torsion stress effect, was conducted in the context of a specific application This concerns the use of GMI to realize a toroidal current clamp (probe), which is mechanically flexible (not rigid) and which allows for both DC and AC measurements with the same sensitive element. By far, satisfying these features could not be achieved using the magnetic sensor technologies available. It depends on how the user manipulates the sensor to perform the measurement Both bending and torsion stresses could be combined, resulting in a global change of the GMI response.
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