Reducing the Temperature Coefficient of the Magnetic Sensor With FeCoSiB Amorphous Wire

Big offset drift with the change of the temperature was found for the magnetic sensor with (Fe
_0.06
Co
_0.94
)
_72.5
Si
_2.5
B
₁₅
amorphous wire. To reduce the temperature coefficient of the magnetic sensor, a bias reversal technology was developed. Instead of the static dc bias current, a square wave current, which was switched between +I
_B
and -I
_B
, was used to bias the magnetic sensor with amorphous wire. The switching frequency of the square wave was about 1 kHz. Using the bias reversal technology, the temperature coefficient of the magnetic sensor was significantly reduced. This magnetic sensor with bias reversal technology will be suitable for wide temperature operation and longtime magnetic field measurement.