Magnetic recording medium exhibiting low noise and high...

Details Magnetic recording medium exhibiting low noise and high... Magnetic recording medium exhibiting low noise and high...

2007-07-24

2007-07-24

Rickman, Holly (Department: 1773)

Stock material or miscellaneous articles

Magnetic recording component or stock

Thin film media

Reexamination Certificate

active

10319842

ABSTRACT:
A magnetic recording medium exhibiting low noise and having a sufficiently high coercive force includes a magnetic layer having a granular structure including ferromagnetic crystal grains with a hexagonal closed packed structure and a nonmagnetic grain boundary region of mainly an oxide intervening between the crystal grains. An underlayer has a body-centered cubic lattice structure. A nonmagnetic intermediate layer with the hexagonal closest packed structure includes Ru, Os, and/or Re, which are provided between the magnetic layer and the underlayer. A degree of mismatching Δ=|d1−d2|/d1is at most 10%, for instance, in a range from 2.5% to 7.0%, where d1is a spacing of lattice planes of the crystal grains in the magnetic layer and d2is a spacing of the lattice planes of the crystal grains in the intermediate layer. A proportion of the crystal grains with a grain size of equal or greater than 8 nm are at most 10% of the crystal grains included in the intermediate layer and a standard deviation of the grain size is at most 1.4 nm. The layers are deposited without preheating the substrate.

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Search Report and Witten Opinion issued by Singapore/Danish Patent and Trademark Office issued Aug. 30, 2004.

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