Characterization of stress-annealed amorphous CoFeBSi ribbons by GMI and inductance spectroscopy

The effect of tension annealing on Co66Fe4Si12B18 amorphous alloys was studied by means of magnetoinductance measurements. Samples annealed under stress manifested a strong decrease in transverse permeability and relaxation frequency, as compared with their as-cast alloy counterpart. Samples subsequently subjected to a further relaxation regime showed moderate improvements on both parameters. These results are interpreted on the basis of the axial anisotropy induced by the stress-annealing conditions and its influence on the low-frequency magnetization processes of the alloys.