The mechanism for loss minimization at medium and high frequencies in field annealed amorphous alloys

Energy loss and initial permeability behavior at medium and high frequencies are optimized in transversally field annealed amorphous ribbons when the magnetization process is accomplished by a mix of domain wall displacements and moment rotations. A reason for this is found in the selective damping mechanism for the motion of the domain walls, whose contribution to the total magnetization reversal is progressively reduced in favor of rotations with increasing the magnetizing frequency.