Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

2007-06-12

2007-06-12

Rickman, Holly (Department: 1773)

Stock material or miscellaneous articles

Magnetic recording component or stock

Thin film media

Reexamination Certificate

active

10444962

ABSTRACT:
A magnetic recording medium including a magnetic recording layer and a substrate that supports the magnetic recording layer is provided. At least two underlayers including a nonmetallic underlayer are placed between the magnetic recording layer and the substrate. The perpendicular magnetic recording medium uses a double-layered or tri-layered underlayer. Accordingly, a perpendicular magnetic recording layer can have a high perpendicular magnetic anisotropic energy constant Ku due to a third underlayer and have small crystal grains and a small exchange coupling due to a second underlayer below the third underlayer. Thus, the perpendicular magnetic recording layer can have a good thermal stability, high-density recording characteristics, and excellent SNR characteristics.

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patent: 2002-197636 (2002-07-01), None
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Saito et al., “Magnetic properties and microstructure of CoCrPtB perpendicular thin-film media with a Co60Cr40 layer and a very thin C layer”, Jan. 2002, Acad. J. Soc. Appl. Magn., vol. 26, No. 4, pp. 210-214.
Machine translation of JP 2001-283428, Oikawa Soichi et al., Oct. 2001.
Machine translation of JP 08-030951, Yoshino Ryoetsu et al., Feb. 1996.
Machine translation of JP 2000-276727, Shimizu, Kenji et al., Oct. 2000.
Machine translation of JP 2002-197636, Aisaka Tetsuya, Jul. 2002.
Notice to Submit Response issued by the Korean Patent Office on May 17, 2004 in corresponding application 10-2002-0059780.
Japanese Office Action dated Apr. 12, 2006.

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