Accurate and quick response type magnetometers are presented using two amorphous core multivibrator bridge with a dc output. As-prepared zero-magnetostrictive amorphous ribbons of Fe4.7Co70.3B15Si10 with 1-mm width are used as straight form for field sensing. In these two core type magnetometers, sensitivity is about 8 times that of one core type magnetometers and temperature stability and flux change stability are high due to that the flux reversals occur in rotational magnetization regions. Minimum detectable field is about 10-5 Oe and the cut-off frequency for ac field detection is about 3 kHz. Analytical results are compared with the experimental results.
