Comparison of Barkhausen noise power between soft ferrites and silicon steels

Barkhausen noise powers of Mn-Zn ferrites and 1% Si steels were measured. The experimental data are discussed in terms of the relevant quantities: saturation flux density B_s, conductivity _sigma , cross-sectional area of samples S₀ and grain diameter d. At low field velocities mod H mod , magnetization processes are dominated by independent displacements of 180 degrees walls. The peak noise power P_m in the vicinity of the coercive field is proportional to the field velocity mod H mod . These two simple results reflect nonoverlapping Barkhausen pulses.