Magnetic recording medium, and thermal stability measuring...

Details Magnetic recording medium, and thermal stability measuring... Magnetic recording medium, and thermal stability measuring...

2007-05-22

2007-05-22

Rickman, Holly (Department: 1773)

Stock material or miscellaneous articles

Magnetic recording component or stock

Thin film media

Reexamination Certificate

active

09540646

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.

REFERENCES:
patent: 6057021 (2000-05-01), Ishikawa et al.
patent: 6403240 (2002-06-01), Kanbe et al.
patent: 6562488 (2003-05-01), Chen et al.
Lee et al., “Effects of Cr Intermediate Layers on coCrPt Thin film Media on NiAl Underlayers”, IEEE Trans Magn., vol. 31, No. 6, Nov. 1995, pp. 2728-2730.

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