Title :
Optimization of Autonomous Magnetic Field Sensor Consisting of Giant Magnetoimpedance Sensor and Surface Acoustic Wave Transducer
Author :
Li, Bodong ; Morsy, Ahmed Mohamed ; Kosel, Jürgen
Author_Institution :
Phys. Sci. & Eng. Div., King Abdullah Univ. of Sci. & Technol., Thuwal, Saudi Arabia
Abstract :
This paper presents a novel autonomous thin film magnetic field sensor consisting of a tri-layer giant magnetoimpedance sensor and a surface acoustic wave transponder. Double and single electrode interdigital transducer (IDT) designs are employed and compared. The integrated sensor is fabricated using standard microfabrication technology. The results show the double electrode IDT has an advantage in terms of the sensitivity. In order to optimize the matching component, a simulation based on P-matrix is carried out. A maximum change of 2.4 dB of the reflection amplitude and a sensitivity of 0.34 dB/Oe are obtained experimentally.
Keywords :
electromagnetic wave reflection; giant magnetoresistance; interdigital transducers; magnetic field measurement; magnetic sensors; magnetic thin films; matrix algebra; microfabrication; surface acoustic wave transducers; IDT design; P-matrix; autonomous thin film magnetic field sensor; double electrode IDT; electrode interdigital transducer; integrated sensor; optimization; reflection amplitude; sensitivity; standard microfabrication technology; surface acoustic wave transducer; surface acoustic wave transponder; trilayer giant magnetoimpedance sensor; Magnetic multilayers; Magnetoacoustic effects; Sensitivity; Surface acoustic wave devices; Surface acoustic waves; Transponders; GMI; Giant magnetoimpedance; SAW; autonomous sensor; surface acoustic wave;
Journal_Title :
Magnetics, IEEE Transactions on
DOI :
10.1109/TMAG.2012.2202278
