Stress dependence of large Barkhausen and Matteucci effects in amorphous magnetostrictive wires.

Abstract

Magnetic properties of amorphous magnetostrictive FeCoSiB-alloy wires, made by the inwater quenching technique, were studied. Domain pattern observation on the wire surface was made as a function of alloy composition and of applied magnetic field and tensile stress along the wire axis. The domain pattern was found to disapper at an axial field of 40 Oe and a tensile stress of about 12 kg/mm2. The residual stress is estimated to be 4-10 kg/mm2. Large Barkhausen and Matteucci voltage pulses and domain nucleation field in Fe77.5Si7.5B15 wires were found to decrease to zero at a compressive stress of 5 kg/mm2.