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United States Patent 5,447,796
Tsukamoto, et. al.Sept. 5, 1995

Magnetic recording medium comprising a solid lubrication layer of fullerene carbon having an alkyl or allyl chain

Inventors: Tsukamoto; Yuji (Tokyo, JP); Fukuchi; Takashi (Tokyo, JP).
Assignee: NEC Corporation (Tokyo, JP).
Appl. No.: 261,212
Filed: Jun. 15, 1994

Related U.S. Application Data
Continuation of (including streamline cont.) Ser. No.35,154, Mar. 22, 1993, abandoned.

Foreign Application Priority Data
Mar. 25, 1992 [JP]4-66634
Intl. Cl.:G11B 5/00
U.S. Cl.:428/408; 428/694.TC; 428/900
Field of Search:428/694 TC, 408, 900

References Cited

U.S. Patent Documents
4,503,125Mar., 1985Nelson et al. 428/408
4,774,147Sept., 1988Kuse et al. 428/323
4,804,590Feb., 1989Nakamura et al. 428/408
4,891,114Jan., 1990Hitzfeld et al. 204/192.15
5,045,165Sept., 1991Yamashita 204/192.16

Other References

Primary Examiner: Resan; Stevan A.
Attorney, Agent or Firm: Sughrue, Mion, Zinn, Macpeak & Seas


A magnetic disk has a magnetic medium or a protection film, and a solid lubrication film formed on the medium or the protection film and consisting of a fullerene C60, C 70 or C84 and an alkyl or allyl-chained fullerene. The lubrication film provides the disk with high mechanical durability and high linear recording density.

4 Claims, 4 Drawing Figures

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