Advanced Magnetoimpedance Sensors

Advanced Magnetoimpedance Sensors

Details

The Magnetoimpedance (MI) effect refers to a large impedance change of a ferromagnetic material upon the application of an external magnetic field.

MI sensors can provide outstanding sensitivity, but they require high freuqency measurements, making their operation more complex than magnetoresistive or Hall effect sensors.

On the other hand, MI sensors are very simple in structure, easy to fabricate and robust, and the high frequency operation can be exploited for wireless sensing.

The objective of this project is to explore the potential advantages of the MI effect to extend the scope of MI sensors to advanced applications such as flexible magnetic sensors, passive wireless magnetic sensors, multifunctional sensor. etc.

A flexible MI sensor and its impedance (Z) characteristic as a function of the bending radius (R).A passive wireless magnetic field sensor fabricated on a piezoelectric lithium niobate substrate. The device consists of a surface acoustic wave transponder with a receiver and reflector interdigital transducer (IDT). The reflector IDT is loades with an MI sensor.




A passive wireless multifunctional sensor for measuring temperature, humidity and magnetic field fabricated on a piezoelectric lithium niobate substrate. The device consists of a surface acoustic wave transponder with two receiver and several reflector interdigital transducers (IDT).





Collaborators


Publications

H. Al Rowais, B. Li, C. Liang, Y. Gianchandani, J. Kosel: Development of a Passive and Remote Magnetic Micro Sensor with Thin-film Giant Magnetoimpedance Element and Surface Acoustic Wave Transponder, J. Appl. Phys., 109, 07E524 (2011).​