Title :
Optimized 425MHz passive wireless magnetic field sensor
Author :
Bodong Li ; Kosel, Jurgen
Author_Institution :
Comput. Electr. & Math. Sci. & Eng. Div., King Abdullah Univ. of Sci. & Technol., Thuwal, Saudi Arabia
Abstract :
A passive, magnetic field sensor consisting of a 425 MHz surface acoustic wave device loaded with a giant magnetoimpedance element is developed. The GMI element with a multilayer structure composed of Ni80Fe20/Cu/Ni80Fe20, is fabricated on a 128° Y-X cut LiNbO3 LiNbO3 substrate. The integrated sensor is characterized with a network analyzer through an S-parameter measurement. Upon the application of a magnetic field, a maximum magnitude change and phase shift of 7.8 dB and 27 degree, respectively, are observed. Within the linear region, the magnetic sensitivity is 1.6 dB/Oe and 5 deg/Oe.
Keywords :
copper; giant magnetoresistance; magnetic field measurement; magnetic multilayers; magnetic sensors; magnetoresistive devices; nickel compounds; submillimetre wave detectors; surface acoustic wave sensors; terahertz wave detectors; wireless sensor networks; GM! element; LiNbO3; Ni80Fe20-Cu-Ni80Fe20; S-parameter measurement; frequency 425 MHz; gain 7.8 dB; giant magnetoimpedance element; multilayer structure; network analyzer; passive wireless magnetic field sensor; surface acoustic wave device; Anisotropic magnetoresistance; Delays; Perpendicular magnetic anisotropy; Resonant frequency; Sensitivity; Surface acoustic waves; GMI; Magnetoimpedance; Passive Sensor; SAW; Surface Acoustic Wave; Wireless Magnetic Sensor;
Conference_Titel :
Microwave Symposium (IMS), 2014 IEEE MTT-S International
Conference_Location :
Tampa, FL
DOI :
10.1109/MWSYM.2014.6848512
