Writer performance improvement in MR head with over-sized trailing poles technique

A new inductive writer design for MR head with a trimmed and planarized top shield and an over-sized trailing pole is presented. The normal P2 pole is located right above the trimmed top shield. Modeling has been conducted on the write field fringing for this new design. It shows that the field distribution pattern is just a reverse image of the traditional MR write head. With this new design, the straight fringe pattern is located at the trailing side and a better written track is expected due to the elimination of the curved write field fringing in a traditional head. The actual samples were fabricated and their performance was evaluated by MFM image. The result shows the written track is straight with nearly zero erase band. The track width is independent of the bit density as expected.