Analysis for Domain Dynamics in Amorphous Magnetostrictive Wires of the Composition (Fe77.5Si7.5B15)

Domain wall processes (domain wall configuration, propagatation and collapse) in magnetostrictive amorphous wires of the composition (Fe77.5Si7.5B15) were investigated. The wires were held under tensile stress (up to 1700 MPa in the case of asquenched). The domain wall length and normal mobility (or damping) as functions of applied stress were found experimentally and theoretically from an ellipsoidal domain model. This alloys the losses to be separated into eddy current and spin relaxation contributions. It was demonstrated that the process of domain collapse affected by internal magnetic field generated a very sharp voltage pulse. The change in the voltage pulse shape with increase of tension was investigated as well.