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

fYear

2014

fDate

1-6 June 2014

Firstpage

1

Lastpage

4

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;

fLanguage

English

Publisher

ieee

Conference_Titel

Microwave Symposium (IMS), 2014 IEEE MTT-S International

Conference_Location

Tampa, FL

Type

conf

DOI

10.1109/MWSYM.2014.6848512

Filename

6848512