Magnetic recording medium comprising a ferromagnetic metal film

Details Magnetic recording medium comprising a ferromagnetic metal film Magnetic recording medium comprising a ferromagnetic metal film

1992-10-22

1994-11-15

Resan, Stevan A.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

428216, 428217, 428336, 428408, 428694TC, 428900, G11B 500

Patent

active

053646908

ABSTRACT:
A magnetic recording medium comprising: a non-magnetic substrate; a ferromagnetic metal thin film provided on the non-magnetic substrate; a filmlike first carbon layer provided on the ferromagnetic metal thin film; and a hard and amorphous second carbon layer provided on the first carbon layer; the first and second carbon layers having first and second Raman spectra based on Raman spectrophotometry, respectively; assuming that when each of the first and second Raman spectra is decomposed into a first band of Gaussian function having a peak in the vicinity of 1380 cm.sup.-1 and a second band of Gaussian function having a peak in the vicinity of 1550 cm.sup.-1 in X-Y rectangular coordinates with an X-axis expressed in cm.sup.-1 and a Y-axis indicative of spectral intensity, a ratio of an area enclosed by the first band and the X-axis to an area enclosed by the second band and the X-axis represents "relative intensity", the first carbon layer has a relative intensity of 2 to 20, while the second carbon layer has a relative intensity of 0.8 to 3, a Vickers hardness of not less than 1,000 kg/mm.sup.2 and a thickness of 50 to 300 .ANG..

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patent: 5045165 (1991-09-01), Yamashita
patent: 5069967 (1991-12-01), Yokoyama et al.
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Abstract: JP-A-3-130919 (Jun. 4, 1991).
Abstract: JP-A-62-183022 (Aug. 11, 1987).
Abstract: JP-A-62-159331 (Jul. 15, 1987).

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