Influence of insulators on R/W process in laminated film heads

The influence of insulators on read/write (R/W) process in laminated film heads was investigated by the Bitter method and computer simulations. Some unrecorded areas exist in a recording track, and the areas correspond to the position of insulators at the trailing side. The effective recording width depends on not only the recording current but also the relative positions of insulators at the leading and trailing edges. These results were confirmed by the simulation. In the reproducing process, the loss caused by the insulator is smaller than the ratio of the track width by the insulator´s thickness. In both R/W characteristics, the laminated film head with inline insulators at both sides of the gap is superior to that with the staggered insulators