发明授权
- 专利标题: Magnetic recording medium comprising a ferromagnetic metal film and two carbon protective layers
- 专利标题(中): 磁记录介质包括强磁性金属膜和两个碳保护层
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申请号: US964861申请日: 1992-10-22
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公开(公告)号: US5364690A公开(公告)日: 1994-11-15
- 发明人: Kiyoshi Takahashi , Mikio Murai , Masaru Odagiri , Hideyuki Ueda , Yukikazu Ohchi , Tatsuya Hiwatashi
- 申请人: Kiyoshi Takahashi , Mikio Murai , Masaru Odagiri , Hideyuki Ueda , Yukikazu Ohchi , Tatsuya Hiwatashi
- 申请人地址: JPX Osaka
- 专利权人: Matsushita Electric Industrial Co., Ltd.
- 当前专利权人: Matsushita Electric Industrial Co., Ltd.
- 当前专利权人地址: JPX Osaka
- 优先权: JPX3-279198 19911025
- 主分类号: G11B5/64
- IPC分类号: G11B5/64 ; G11B5/72 ; G11B5/73 ; G11B5/00
摘要:
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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