Title :
Magnetic field sensor by giant magneto-impedance
Author :
Hauser, H. ; Nicolics, J. ; Pohl, A.
Author_Institution :
Fac. of Electr. Eng., Tech. Univ. Wien, Austria
Abstract :
Following the demands of industrial and automotive electronics, a direction sensitive micro-magnetic field sensor is developed using the giant magneto-impedance (GMI) effect in a 30 μm diameter amorphous FeCoSiBNd wire. Consisting of a micro-sized zero-magnetostrictive amorphous wire of about 70 μm length, the GMI sensor was connected to a self oscillating Colpitts oscillator circuit by laser welding. It shows a high sensitivity with a resolution of 100 nT for dc fields, quick response, and a high temperature stability. Reproducible measurements of a surface-flux distribution of mechanically 100 μm structured magnetic barcodes were carried out. Finally, the outline of a surface acoustic wave device with GMI effect is discussed
Keywords :
amorphous magnetic materials; boron alloys; cobalt alloys; ferromagnetic materials; giant magnetoresistance; iron alloys; magnetic sensors; neodymium alloys; sensitivity; silicon alloys; thermal stability; direction sensitive micro-magnetic field sensor; giant magneto-impedance; magnetic barcodes; self oscillating Colpitts oscillator circuit; sensitivity; surface acoustic wave device; surface-flux distribution; temperature stability; zero-magnetostrictive amorphous wire; Amorphous magnetic materials; Amorphous materials; Automotive electronics; Circuits; Electronics industry; Magnetic sensors; Oscillators; Surface acoustic wave devices; Welding; Wire;
Conference_Titel :
Instrumentation and Measurement Technology Conference, 1999. IMTC/99. Proceedings of the 16th IEEE
Conference_Location :
Venice
Print_ISBN :
0-7803-5276-9
DOI :
10.1109/IMTC.1999.776760
