US 2004/0166279 A1 · Magnetic recording medium, process for producing same and magnetic disc apparatus

Abstract

An object of the present invention is to provide a magnetic recording medium which has a sufficient impact resistance to withstand its accidental collision with a magnetic head and is neither worn away nor fractured in the CSS area by contact or friction between the magnetic recording medium and the magnetic head even if the thickness of a protective filmy layer is reduced in the data area. In order to achieve this object, a magnetic film and a protective film are formed on a substrate, and for example, the other portion of said protective film than a portion where said protective film comes into contact with a magnetic head is made of not only carbon and nitrogen but also hydrogen for increasing the hardness of said protective film.

Claims1

Dependent claims

A magnetic recording medium comprising:

a magnetic disk having a data zone and a CSS zone and including:
a substrate, and
a magnetic film formed on said substrate and
a protective film formed thereon for the protection of said magnetic film and composed mainly of carbon, said protective film including a first portion overlying said CSS zone, and a second portion overlying said data zone,
said first portion of said protective film being composed mainly of carbon and nitrogen, and
said second portion of said protective film being composed mainly of not only carbon and nitrogen but also hydrogen for increasing the hardness of the protective film.

3 more elements

Dependencies are inferred from the claim text.

Facts

Application

10/055,996Filed 28 Jan 2002

Priority

JP 10-2499503 Sep 1998

Published

26 Aug 2004

Term ends

Not estimatedThe source records don’t support an estimate.

Classification10 codes

G11B 5/727
Protective coatings, e.g. anti-static or antifriction: inorganic carbon protective coating, e.g. graphite, diamond like carbon or doped carbon
G11B 31/003
Arrangements for the associated working of recording or reproducing apparatus with related apparatus: with radio receiver
G11B 31/006
Arrangements for the associated working of recording or reproducing apparatus with related apparatus: with video camera or receiver
Y10S 428/90
Stock material or miscellaneous articles: magnetic feature

Magnetic recording medium, process for producing same and magnetic disc apparatus

Life of this patent

Magnetic recording medium, process for producing same and magnetic disc apparatus

Life of this patent

Abstract

Claims1