Perpendicular magnetic recording media

Details Perpendicular magnetic recording media Perpendicular magnetic recording media

2006-09-05

2006-09-05

Rickman, Holly (Department: 1773)

Stock material or miscellaneous articles

Magnetic recording component or stock

Thin film media

Reexamination Certificate

active

07101634

ABSTRACT:
A perpendicular magnetic recording medium including a perpendicular magnetic recording layer placed over a substrate, and a multi-layered perpendicular orientation underlayer placed between the substrate and the perpendicular magnetic recording layer and having first and third underlayers each made of Pt or an alloy thereof. Due to the use of a three-layered perpendicular orientation underlayer, an excellent perpendicular orientation and a consistent crystal lattice of a Pt underlayer are obtained. Also, the perpendicular orientation underlayer has small crystal grains. Thus, the perpendicular orientation underlayer having excellent perpendicular orientation and small crystal grains enables a perpendicular magnetic recording layer to have a good thermal stability, a high recording density, and a high SNR.

REFERENCES:
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patent: 2003/0108776 (2003-06-01), Chang et al.
patent: 2004/0247945 (2004-12-01), Chen et al.
Sato et al., “Co—CrPt—Ta perpenducular magnetic recording media using Pt seed layer”, Sep. 2000, IEEE Trans Magn, vol. 36, No. 5, pp. 2387-2389.
Text of the First Office Action issued by the Chinese Patent Office on Nov. 5, 2004 in corresponding application.

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