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Distance Sensors Utilizing Large Barkhausen Effect of Amorphous Wires

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4 Author(s)
Uchiyama, T. ; Nagoya University. ; Mohri, K. ; Konno, Y. ; Satoh, T.

New distance sensors are described which utilize the large Barkhausen effect of amorphous magnetostrictive wires. Only one domain wall propagates in the direction of the wire axis under a driving magnetic field H when the condition H* ≫ H ≫ H0 is satisfied throughout the length of the wire, where H* is the critical field for nucleation of reverse domains, and H0 is the critical field for domain wall displacement. A distance sensor with a nonlinearity of less than 0.7% full-scale throughout a length of 1000 mm was fabricated using a cold-drawn and then heat-treated Fe77.5Si7.5B15 amorphous wire of diameter 30 ¿m and length 1400 mm, in which the wall velocity vw = 2Ms(H-H0)/ß is controlled by increasing H*.

Published in:

Magnetics in Japan, IEEE Translation Journal on  (Volume:5 ,  Issue: 9 )