One-dimensional AGMI sensor with Co < inf > 66 < /inf > Fe < inf > 4 < /inf > Si < inf > 15 < /inf > B < inf > 15 < /inf > ribbon as sensing element

Abstract

A novel asymmetric giant magneto impedance (AGMI) sensor was developed and the performance of the sensor was carefully studied. This one dimensional sensor can be further developed as a two-dimensional compass that can be used for navigational purposes. We used commercial Metglas 2714A ribbon. The sensor uses Co66Fe4Si15B15 ribbon as a sensing element. The results showed for high sensitivity and resolution. The GMI sensor consists of a crystal oscillator voltage to current converter for providing the current to the sample, a differential amplifier, successive amplifier stages, multiplier, and cascaded low-pass filters. The observed sensitivity was 25 V/Oe. Angle sensitivity was found to be 2 mV/degree. Our sensor showed excellent linearity when compared with previous sensors [13, 14]. These sensors require dc bias coils and two sensor elements to attain good linearity. © 2007 Springer-Verlag.