Patent ID: 8092931
Filing Date: 2012-01-10
Classification: C23C,G11B

Abstract:
1. A magnetic disk having a magnetic layer formed on a nonmagnetic glass substrate and a protection layer formed on the magnetic layer, wherein: the protection layer has a characteristic such that, when a spectrum is obtained by excluding photoluminescence from a Raman spectrum in a wavenumber band from 900 cm the protection layer contains carbon and hydrogen as essential elements and contains nitrogen as an additional element and is deposited by plasma CVD, wherein when the protection layer is made of carbon, nitrogen and hydrogen, a ratio Dw/Gw between a half width Dw of the D peak and a half width Gw of the G peak falls within a range between 2 and 2.7, when the protection layer is made of carbon and hydrogen, the ratio Dw/Gw exceeds 0 and is less than 2, wherein the protection layer has a film thickness within a range between 1 nm and 5 nm, and the magnetic disk is for use in a load unload system.