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A distance sensor which uses the large Barkhausen effect in amorphous wires magnetized by a current is described. A helical anisotropy is created in an Fe77.5Si7.5B15 amorphous wire (cold-drawn and then tension-annealed) by applying torsion, and consequently the wire can be magnetized by the circumferential magnetic field created by the wire current. This type of distance sensor does not require a...
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