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Amorphous wire MI micro magnetic sensor for gradient field detection

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5 Author(s)
Bushida, K. ; Dept. of Electr. Eng., Nagoya Univ., Japan ; Mohri, K. ; Kanno, T. ; Katoh, D.
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A sensitive and quick response micro magnetic sensor for detection of a very localized field (gradient field) cancelling background disturbance field is presented using a high frequency (20~40 MHz) multivibrator having a pair of amorphous wire MI heads each of 1~3 mm in length. The resolution of field detection is 10-6 Oe for an ac field and the cut-off frequency is about 200 kHz. Stable detection of the surface field of a densely magnetized ring magnet with 19 mm diameter and 2000 poles (30 μm in pole interval) for a high resolution rotary encoder was carried out with a sinusoidal waveform

Published in:

Magnetics, IEEE Transactions on  (Volume:32 ,  Issue: 5 )