| abstract |
(57) [Abstract] [Purpose] To obtain a high recording density compatible magnetic disk with improved durability by using an amorphous carbon film having excellent wear resistance and electrical insulation as a protective layer. [Structure] When the Raman spectrum waveform of the carbon-based protective layer 5 is separated into two Gaussian function type waveforms, the peak position of one waveform (A) is 1545 cm to 1 or less, and the peak position of the other waveform (B) is It is 1320 to 1360 cm to 1 , and the sliding resistance is improved by using an amorphous hydrogenated carbon layer having an area ratio (B / A) in the half width of these waveforms of 0.3 to 0.7. . [Effect] The durability of the magnetic disk is increased and the life is extended. Further, as a result, it becomes possible to operate with a low flying height or in a contact state, and the recording density is improved. |