Magnetic recording medium comprising a ferromagnetic metal film and two carbon protective layers

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United States of America Patent

PATENT NO 5364690
SERIAL NO

07964861

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Abstract

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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 Owner(s)

Patent OwnerAddress
MATSUSHITA ELECTRIC INDUSTRIAL CO LTDOSAKA JAPAN

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Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Hiwatashi, Tatsuya Kumamoto, JP 10 124
Murai, Mikio Hirakata, JP 23 621
Odagiri, Masaru Kawanishi, JP 109 1056
Ohchi, Yukikazu Kadoma, JP 20 387
Takahashi, Kiyoshi Ibaraki, JP 177 1902
Ueda, Hideyuki Takatsuki, JP 63 669

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