Stock material or miscellaneous articles – All metal or with adjacent metals – Having magnetic properties – or preformed fiber orientation...
Reexamination Certificate
2005-04-26
2005-04-26
Bernatz, Kevin M. (Department: 1773)
Stock material or miscellaneous articles
All metal or with adjacent metals
Having magnetic properties, or preformed fiber orientation...
C428S660000, C428S666000, C428S675000, C428S678000, C428S323000, C428S690000, C427S131000, C427S132000
Reexamination Certificate
active
06884520
ABSTRACT:
A perpendicular magnetic recording medium has a nonmagnetic substrate, a nonmagnetic underlayer, a magnetic layer, a protective film, and a liquid lubrication layer sequentially laminated on the substrate. The nonmagnetic layer is composed of a metal or alloy having a hcp crystal structure. The magnetic recording layer consists of ferromagnetic crystal grains and a nonmagnetic grain boundary phase mainly composed of an oxide surrounding the grains. A seed layer of a metal or alloy having a fcc crystal structure can be provided under the nonmagnetic underlayer, and a nonmagnetic alignment control layer can be provided under the seed layer. The recording medium can provide high output and low noise by improving the alignment of the magnetic recording layer, reducing the initial growth layer in the magnetic recording layer, and minimizing the grain size of the magnetic recording layer.
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JPO Abstract of JP 2000-322726-A.*
“High Performance CoPtCrO Sigle Layered Perpendicular Media with No Recording Demagnetization”; Soichi Oikawa et al.; IEEE Transactions on Magnetics,, vol. 36, No. 5; Sep. 2000; pp. 2393-2395.
Nakamura Miyabi
Oikawa Tadaaki
Takenoiri Shunji
Uwazumi Hiroyuki
Bernatz Kevin M.
Fuji Electric Co., Ld.
Rossi, Kimms & McDowell
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