Dynamic information storage or retrieval – Storage or retrieval by simultaneous application of diverse... – Magnetic field and light beam
Reexamination Certificate
2007-04-20
2008-09-02
Neyzari, Ali (Department: 2627)
Dynamic information storage or retrieval
Storage or retrieval by simultaneous application of diverse...
Magnetic field and light beam
C360S324120, C428S831000
Reexamination Certificate
active
07420886
ABSTRACT:
There is disclosed a magnetic recording medium in which a seed layer, under layer, intermediate layer, first magnetic layer, nonmagnetic layer, second magnetic layer, protective layer, and lubricant layer are successively laminated on a glass substrate, the nonmagnetic layer is constituted of an alloy containing Cr and C, and the magnetic layer is constituted of an alloy containing Co and Pt. The under layer includes at least the seed layer for finely dividing the crystal particles of the magnetic layer, the seed layer includes at least two or more layers of nonmagnetic films, and the intermediate layer formed of the material different from that of the nonmagnetic film is interposed between the nonmagnetic films. In measurement of the thermal stability of the magnetic recording medium, a head is used, the head includes a read/write element, and a write track width is twice or more as large as a read track width in the head.
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Lee, L-L. et al, “Effects of Cr Intermediate Layers on CoCrPt Thin Film Media on NiAl Underlayers,” IEEE Transactions on Magnetics, vol. 31, No. 6, Nov. 1995, pp. 2728-2730.
Hata Genshichi
Kobayashi Masato
Morikawa Takashi
Suzuki Masashi
Tomiyasu Hiroshi
Cook Alex Ltd.
Hoya Corporation
Neyzari Ali
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