United States Patent 5,447,796

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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

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

Other References

Curl et al. "Fullerenes" Scientific American Oct. 1991 p. 54+.

Edelson, Eward "Buckyball the magic molecule" Popular Science Aug. 1991 p. 52+.

Kroto, Harold "Space, Stars, C(60), and Sect" Science Nov. 1988 p. 1139+.

H. W. Kroto et al., "C(60) : Buckminsterfullerene", Nature, vol. 318, Nov. 14, 1985, pp. 162-163.

H. W. Kroto et al., "The formation of quasi-icosahedral spiral shell carbon particles", Nature, vol. 331, Jan. 28, 1988, pp. 328-331.

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

Abstract

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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