Stock material or miscellaneous articles – Composite – Of inorganic material
Reexamination Certificate
2005-05-17
2005-05-17
Rickman, Holly (Department: 1773)
Stock material or miscellaneous articles
Composite
Of inorganic material
C428S690000, C428S212000, C428S336000, C428S900000, C427S130000, C427S131000
Reexamination Certificate
active
06893748
ABSTRACT:
A perpendicular magnetic recording disk having a soft magnetic film disposed between a substrate and a magnetic recording layer. The soft magnetic film includes a soft magnetic underlayer and one or more layer groups having a spacer layer and a soft magnetic layer disposed above the spacer layer in each layer group. The spacer layers induce anti-ferromagnetic coupling between the surrounding ferromagnetic layers. The spacer layers may be comprised of ruthenium. The soft magnetic layers may have a granular decoupled structured through the use of a segregate.
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Bertero Gerardo
Malhotra Sudhir
Velu Emur M.
Wachenschwanz David
Blakely , Sokoloff, Taylor & Zafman LLP
Komag, Inc.
Rickman Holly
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