Possible origin for the bamboo domain structure in Co-rich amorphous wire

It is shown that the bamboo domain structure in the outer shell of the Co-rich amorphous wire may arise due to small disturbances in the axial symmetry of the wire. As an example, an elliptical deformation of the wire cross-section is considered. If the anisotropy constant has sufficient value near the wire surface, even small elliptical deformation may lead to a finite period of the domain structure of the order of wire radius.