Method to make an integrated side shield PMR head with non...

Dynamic magnetic information storage or retrieval – Head – Core

Reexamination Certificate

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C360S125040, C360S125110, C360S125150

Reexamination Certificate

active

08031433

ABSTRACT:
A non-conformal integrated side shield structure is disclosed for a PMR write head wherein the sidewalls of the side shield are not parallel to the pole tip sidewalls. Thus, the side gap distance between the leading pole tip edge and side shield is different than the side gap distance between the trailing pole tip edge and side shield. As a result, there is a reduced side fringing field and improved overwrite performance. The side gap distance is constant with increasing distance from the ABS along the main pole layer. A fabrication method is provided where the trailing shield and side shield are formed in the same step to afford a self-aligned shield structure. Adjacent track erasure induced by flux choking at the side shield and trailing shield interface can be eliminated by this design. The invention encompasses a tapered main pole layer in a narrow pole tip section.

REFERENCES:
patent: 2007/0253107 (2007-11-01), Mochizuki et al.
patent: 2008/0100959 (2008-05-01), Feldbaum et al.
“One Terabit per Square Inch Perpendicular Recording Conceptual Design,” by M. Mallary et al., IEEE Transactions on Magnetics, vol. 38, No. 4, Jul. 2002, pp. 1719-1724.
Co-pending US Patent HT06-036, U.S. Appl. No. 11/787,015, filed Apr. 13, 2007, “Optimized Write Pole Flare Angle for Side Shield or Semi Side Shield PMR Writer Application,” assigned to the same assignee as the present invention.
Co-pending US Patent HT07-050, U.S. Appl. No. 12/072,272, filed Feb. 25, 2008, “A Method to Make PMR Head with Integrated Side Shield (ISS),” assigned to the same assignee as the present invention.

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