PMR write with flux choking area

Dynamic magnetic information storage or retrieval – Head – Core

Reexamination Certificate

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Reexamination Certificate

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08085498

ABSTRACT:
A PMR writer having a trailing shield structure is disclosed in which a flux choking layer (FCL) formed adjacent to the ABS provides a means to limit the amount of flux flowing from the trailing shield to a first write shield (WS1) near the write pole tip thereby significantly reducing adjacent track erasure. The FCL has a substantially smaller thickness than a top section of the trailing shield to which it is attached along a side opposite the ABS. As a result, pole tip protrusion is reduced compared to prior art PMR writers. The FCL contacts a trailing side of WS1at the ABS and one or both of the trailing sides of the WS1and FCL may be tapered or perpendicular with respect to the ABS. The top trailing shield section, FCL, and WS1may be comprised of NiFe, CoFe, CoFeNi, or alloys thereof.

REFERENCES:
patent: 4858048 (1989-08-01), Hayakawa et al.
patent: 7538976 (2009-05-01), Hsiao et al.
patent: 2005/0259356 (2005-11-01), Han et al.
patent: 2009/0091862 (2009-04-01), Han et al.
patent: 2010/0061016 (2010-03-01), Han et al.
patent: 2011/0086182 (2011-04-01), Matono et al.
“Return Field-Induced Partial Erasure in Perpendicular Recording Using Trailing-Edge Shielded Writers,” by Daniel Z. Bai et al., IEEE Transactions on Magnetics, vol. 43, No. 2, Feb. 2007, pp. 600-604.
Co-pending US Patent HT07-064, U.S. Appl. No. 12/157,683, filed Jun. 12, 2008, “Composite Writer Shield for Improving Writer Performance,” assigned to the same assignee as the present invention.

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