A new highly stable magneto-impedance (MI) micro magnetic sensor with a pai
r of zero-magnetostrictive amorphous wires is presented picking up a first
pulse in an induced oscillatory pulse voltage at a wire coil using an analo
g switch. A high temperature stability in the MI sensor is established in w
hich a zero drift for temperature variation from 20 degrees C to 80 degrees
C is 0.6 % / FS (0.01 % / FS degrees C). The highly stable MI sensor will
be useful for application to automobile controls (ITS).