Domain collapse in amorphous magnetostrictive wires

In magnetostrictive amorphous wires of composition (Fe/sub 77.5/Si/sub 7.5/B/sub 15/) the process of domain collapse is an important ingredient of reentrant reversal. During collapse, a narrow and high voltage pulse is generated due to the formation of an unstable domain. Experimental results showing the influence of an external magnetic field and an applied longitudinal tensile stress on the voltage pulse shape agree well with those calculated on the basis of an ellipsoidal domain model for the collapsing domain. An experiment similar to the Sixtus-Tonks experiment on a long wire was used to model a short wire in a way that is more reproducible and controllable than the self-nucleation of a free wire. The shape of this pulse has been found to change with increase of applied magnetic field or tension.<
>