FLUX PROPAGATION OF SINGLE-LAYERED AND 6-LAYERED THIN-FILM MAGNETIC HEADS

The magnetization response of single-layered and 6-layered thin film h eads in the high frequency region was studied using a scanning Kerr ef fect microscope. For the 6-layered head which has a single domain stru cture, the regions where the magnetization rotation is large converge at the center of the core. The width of these regions does not change so much as the excitation frequency becomes higher, but the regions be come wider and the magnetization rotation becomes larger as the drivin g current increases. On the other hand, for the single-layered head as the excitation frequency becomes higher, the regions where the magnet ization rotation is large become smaller and the domain structure chan ges. Comparison of the magnetization response behavior of single-layer ed and 6-layered heads shows flux conducts transversely along the 180- degrees walls and motion of these walls widens the convergence region where the magnetization rotation is large.