Magnetic disk for loading and unloading system, magnetic disk evaluation method for the preparation and loading and unloading method of magnetic disk for loading and unloading system

摘要

PROBLEM TO BE SOLVED: To improve the durability of a protective layer, especially LUL resistance characteristics even when the film thickness of the protective layer is set equal to/less than 5 nm in a magnetic disk having a magnetic layer on a nonmagnetic substrate and a protective layer on the magnetic layer.;SOLUTION: A protective layer is formed by a plasma CVD method using carbon as a main component. In this protective layer, when a D peak appearing near 1350 cm^-1 and a G peak appearing near 1520 cm^-1 are waveform-separated from each other by a gauss function in a spectrum removing a fluorescent light from Raman spectrum at a frequency 900^-1 to a frequency 1800 cm^-1 obtained based on exciting by the argon ion laser beam of a wavelength 514.5 nm, a ratio Dw/Gw between the half value width Dw of the D peak and the half value width Gw of the G peak exceeds 0, but equal to or less than 2.7.;COPYRIGHT: (C)2005,JPO&NCIPI