Coating processes – Magnetic base or coating – Magnetic coating
Patent
1993-03-24
1994-12-20
Pianalto, Bernard
Coating processes
Magnetic base or coating
Magnetic coating
427131, 427132, H01F 1002
Patent
active
053744500
ABSTRACT:
An object of the present invention is to obtain a magnetic disk which has a high coercive force. It has a constitution in which, at first, a Cr under layer, a magnetic layer of a Co alloy, and a protective layer, a Zr layer for example, are formed in order on a substrate, and it is heat-processed at a temperature of higher than 250.degree. C. The Zr layer is changed to an oxide layer, etc. by the heating process and becomes a layer which functions as a protective layer, and on the other hand, a chemical compound of Zr and a non-magnetic element in the magnetic layer of a Co alloy, Cr for example, is not generated, so that the segregation of Cr into the crystalline grain boundaries of the magnetic layer of a Co alloy is more effectively expedited. Because of this, since magnetic interactions between the crystalline grains in the magnetic layer of a Co alloy are weakened, the disks having high coercive force can be obtained.
REFERENCES:
patent: 4390562 (1983-06-01), Yanagisawa
patent: 4824539 (1989-04-01), Komoda
Japanese Patent, Laid-Open No., HER 2-73924; Preliminary Lecture Notes for Spring Meeting of Applied Physical Society, 29a-Y-8, p. 60, 1990 (Mo. not available).
German Official Letter Dated Jun. 28, 1993 W/English Translation.
Onishi Yoshihiko
Sato Motoharu
Kabushiki Kaisha Kobe Seiko Sho
Pianalto Bernard
LandOfFree
Manufacturing method of magnetic disk does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Manufacturing method of magnetic disk, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Manufacturing method of magnetic disk will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2385339