Temperature effect on GMI sensor: comparison between diagonal and off-diagonal response

Publication date: Available online 21 February 2019Source: Sensors and Actuators A: PhysicalAuthor(s): Julie Nabias, Aktham Asfour, Jean-Paul YonnetAbstractIn this paper, the effect of temperature on Giant Magneto-Impedance (GMI) sensors is studied in amorphous wire Co-Fe-Si-B from Unitika. Both diagonal, Z11, and the off-diagonal, Z21, components of the impedance tensor are considered, with a primary focus on the changes of intrinsic sensitivity and offset, which are the most crucial relevant quantities for practical sensor implementation. Experiments are conducted in the almost industrial temperature range of [-20 °C, 120 °C]. For the component Z11, the results show a maximum change of the offset of -0.13 (A/m)/°C (170 nT/°C), at a 33 A/m bias field. The sensitivity at this field increases for temperatures between -20 °C and + 40 °C, and then it decreases (a maximum change of -0.5 %/°C). For the off-diagonal component, Z21, the change of the offset near the zero-field is smaller (-0.015 (A/m)/°C or −19 nT/°C), whereas the sensitivity increases with temperature by about +0.4 %/°C.Graphical abstract

Source: Sensors and Actuators A: Physical - February 22, 2019 Category: Physics Source Type: research