Thin SUL media with shielded pole head

Details Thin SUL media with shielded pole head Thin SUL media with shielded pole head

2005-06-09

2010-06-08

Ruthkosky, Mark (Department: 1794)

Stock material or miscellaneous articles

Magnetic recording component or stock

Thin film media

C428S827000, C428S832000, C428S832100, C360S327110

Reexamination Certificate

active

07732069

ABSTRACT:
A disk drive system having a shielded pole write head and media that includes a disk having a soft underlayer (SUL) that is relatively thin in order to save on cost for producing the SUL. The SUL is thin enough that it will become magnetically saturated in the vicinity of the write pole. The thickness of the SUL that will achieve this saturation may be stated as being less than a geometric factor times the ratio of the write pole saturation magnetization divided by the saturation magnetization of the SUL. The geometric factor is the ratio of the write pole area at the ABS to the write pole perimeter at the ABS.

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Schabes et al., “Micromagnetic Modeling of Soft Underlayer Magnetization Processes and Fields in Perpendicular Magnetic Recording”,IEEE Transactions on Magnetics, vol. 38, No. 4, Jul. 2002.
Abarra, et al., “Preconditioning, Write, Width, and Recording Properties of Co-Cr-Pt-O Perpendicular Media with Various Underlayer Designs”,IEEE Transactions on Magnetics, vol. 41, No. 2, Feb. 2005.

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