MR/Inductive head for perpendicular magnetic recording

Abstract

Magnetoresistive/Inductive head designs and recording characteristics were discussed in perpendicular magnetic recording. Recording by two sheets of shield showed good overwrite performance in a shielded type MR head. The head had high D50 of 100∼135kFRPI with the shield-to-shield gap of 0.5∼0.7μm. However when the recorded bit-length became shorter than the shield-to-shield gap, the shield had little effect on the medium stray field. In unshielded MR head, though large output was obtained in low density region, the output gradually decreased with increasing the recording density. However the decrease rate was much lower than that of the decrease reported in longitudinal recording. In result, the shielded type and even unshielded type MR heads offered high density recording characteristics in the contact state.