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 /spl mu/m diameter amorphous FeCoSiBNd wire. Consisting of a micro-sized zero-magnetostrictive amorphous wire of about 70 /spl mu/m 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 /spl mu/m structured magnetic barcodes were carried out. Finally, the outline of a surface acoustic wave device with GMI effect is discussed.
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