Magnetoinductance and permeability in Co-based amorphous and nanocrystalline ribbons

Abstract Co-based amorphous ribbons are subjected to a thermal treatment which gives rise to the formation of a nanocrystalline phase. The inductance of the ribbons is measured and an increase of axial permeability, associated to the AC current flowing through the probe, is observed. An increase of magnetoinductance also occur when an AC axial field is applied. The results, which are more remarkable in nanostructured samples, are ascribed to an increase of the domain wall “mobility” under the action of the transversal and/or axial AC field.