Unrecorded Areas on Tracks Recorded by Laminated Heads

The influence of insulating layers in laminated heads on the head recording pattern was investigated, using the Bitter method and computer simulations. Some unrecorded areas exist on recorded tracks, and these correspond to the positions of insulating areas on the trailing side. An unrecorded area becomes wider as the magnetomotive force is increased. The size of an unrecorded area depends on the insulator thickness and the media coercive force. These results were confirmed by simulations using the finite element method.