Stock material or miscellaneous articles – Composite – Of inorganic material
Reexamination Certificate
2005-04-19
2005-04-19
Rickman, Holly (Department: 1773)
Stock material or miscellaneous articles
Composite
Of inorganic material
C428S690000, C428S336000, C428S611000, C428S900000
Reexamination Certificate
active
06881504
ABSTRACT:
A large-capacity magnetic storage apparatus is disclosed, capable of performing ultra-high density magnetic recording of 50 gigabits or more per 1 square inch. In a perpendicular magnetic recording medium having a non-magnetic intermediate layer and a magnetic recording layer sequentially formed, the non-magnetic intermediate layer is composed of a layer having a face-centered cubic structure and containing a non-magnetic elements excluding Pt. Specifically, the intermediate layer mainly contains at least one selected from the group of elements constituted of Al, Cu, Rh, Pd, Ag, Ir and Au, and is composed of a film having a face-centered cubic (f. c. c.) structure. The magnetic recording layer contains at least Co, Cr and Pt, and is composed of a film having a hexagonal close-packed (h. c. p.) structure. More preferably, a non-magnetic h. c. p. intermediate layer is provided between the non-magnetic intermediate layer and the magnetic recording layer.
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Machine translation of JP 2000-099934, Akimoto et al., published Apr. 2000.
Y. Hirayama, K. Ito, Y. Honda, N. Inaba, M. Futamoto, “Thermal Stability of CoCr-alloy Perpendicular Magnetic Recording Media”, Jornal of Magnetism and Magnetic Materials 193 (1999) pp. 253-257.
A. Sato, S. Nagagawa and M. Naoe, “Optimization of the Substrate Temperature for a Paramagnetic Seed Layer in a Co-Cr Perpendicular Recording Medium”, Dept. of Physical Electronics, Tokyo Institute of Technology, (Oct. 27, 1999 and Jan. 25, 2000), vol. 24, No. 4-2, pp. 267-270.
Ishikawa Akira
Tamai Ichiro
Yamamoto Tomoo
A. Marquez, Esq. Juan Carlos
Fisher Esq. Stanley P.
Hitachi Global Storage Technologies Japan Ltd.
Reed Smith LLP
Rickman Holly
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