Stock material or miscellaneous articles – Magnetic recording component or stock – Thin film media
Reexamination Certificate
2005-10-06
2010-02-23
Rickman, Holly (Department: 1794)
Stock material or miscellaneous articles
Magnetic recording component or stock
Thin film media
Reexamination Certificate
active
07666530
ABSTRACT:
Embodiments of the invention relate to easily achieving a perpendicular magnetic recording medium with high reliability and a magnetic recording apparatus with high recording density by improving the magnetic properties and surface smoothness of the soft magnetic underlayer and, moreover, enhancing adhesion with the substrate. In one embodiment, a perpendicular magnetic recording media composing a substrate, an adhesion layer formed on the substrate in which a second underlayer is laminated on a first underlayer, a soft magnetic underlayer formed on the second underlayer, an intermediate layer formed on the soft magnetic underlayer, a perpendicular recording layer formed on the intermediate layer, wherein the aforementioned first underlayer consists of an alloy composed of at least two elements selected from the group of Ni, Al, Ti, Ta, Cr, and Co, and the aforementioned second underlayer consists of Ta or a Ta-based amorphous structured alloy containing at least one element selected from the group of Ni, Al, Ti, Cr, and Zr.
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Arai Reiko
Honda Yoshinori
Matsumoto Hiroyuki
Gold Darren
Hitachi Global Storage Technologies - Netherlands B.V.
Rickman Holly
Townsend and Townsend / and Crew LLP
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