Propagation of reversible magnetization changes along ferromagnetic amorphous ribbons

Local reversible magnetization changes are produced in a region of a long ferromagnetic amorphous ribbon, and their amplitude decay versus the distance from this region is measured. The amplitude decay is analyzed as a function of the reversible permeability on as-cast and annealed ribbons of various widths and thickness at different points of the hysteresis loop. The results are discussed on the basis of the theoretical flux conduction of a magnetically homogeneous cylindrical sample. The results agree with the theoretical model of the magnetic flux conduction on homogeneous materials only for low values of the reversible permeability. The larger deviation, occurring at high values of permeability, are ascribed to both the sample shape and the nonhomogeneous magnetic structure due to magnetic domains.