Abrégé

To provide a magnetic recording medium that achieves further thinning of a lubricating layer and is more suited to the requirement for abrasion resistance, without impairing reliability of a magnetic recording medium such as corrosion resistance and durability, a method is provided for manufacturing a magnetic recording medium, comprising the steps of: (1) forming a protective layer containing carbon on a stacked layer, the stacked layer comprising a substrate and a metal film layer formed on the substrate; (2) forming a lubricating layer on the protective layer; and (3) subjecting the lubricating layer to a fluorine plasma treatment.

Classes IPC  ?

• G11B 5/84 - Procédés ou appareils spécialement adaptés à la fabrication de supports d'enregistrement
• G11B 5/72 - Revêtements protecteurs, p. ex. antistatiques
• G11B 5/725 - Revêtements protecteurs, p. ex. antistatiques contenant un lubrifiant

Abrégé

A perpendicular magnetic recording medium is disclosed in which crystal axis orientation dispersion, crystal grain diameter, and crystal grain diameter dispersion in a magnetic recording layer are reduced. The perpendicular magnetic recording medium has a structure having, stacked sequentially on a non-magnetic substrate, at least an amorphous underlayer, a lower orientation control layer made of Ru or Ru alloy of an hcp structure, an upper orientation control layer that is made of alloy containing an element selected from the group consisting of Co and Ni and an element selected from the group consisting of Cr, W, and Mo and that has an fcc or hcp structure, an intermediate layer, and a magnetic recording layer.

Classes IPC  ?

• G11B 5/66 - Supports d'enregistrement caractérisés par l'emploi d'un matériau spécifié comportant uniquement le matériau magnétique, sans produit de liaison les supports d'enregistrement étant constitués par plusieurs couches magnétiques
• G11B 5/667 - Supports d'enregistrement caractérisés par l'emploi d'un matériau spécifié comportant uniquement le matériau magnétique, sans produit de liaison les supports d'enregistrement étant constitués par plusieurs couches magnétiques comprenant une couche magnétique douce
• G11B 5/73 - Couches de base
• G11B 5/65 - Supports d'enregistrement caractérisés par l'emploi d'un matériau spécifié comportant uniquement le matériau magnétique, sans produit de liaison caractérisé par sa composition
• G11B 5/738 - Couches de base caractérisées par la couche intermédiaire

Abrégé

The object of the invention is to provide a method for manufacturing a protective film of a smaller thickness that makes it possible to prevent the protective film from degradation and maintain corrosion resistance at the same time. The method for manufacturing a carbon-containing protective film in accordance with the present invention includes: (a) a step of forming a carbon material film on a substrate by a plasma CVD method using a starting material gas containing a hydrocarbon gas; and (b) a step of nitriding the carbon material film by using plasma generated from a nitrogen-containing starting material gas in a plasma CVD device having an anode and a cathode, and forming a carbon-containing protective film. In step (b), an anode potential is equal to or greater than 20 V, an ion acceleration potential difference is within a range of 20 V to 120 V, and a substrate current density is within a range of 4 x 10-6 A/mm2 to 8 x 10-6 A/mm2.

Classes IPC  ?

• G11B 5/84 - Procédés ou appareils spécialement adaptés à la fabrication de supports d'enregistrement

Abrégé

The present invention provides a method for producing a protective film, which can be used for producing a magnetic recording medium, the method comprising the steps of: (a) providing a magnetic layer formed on a substrate; and (b) forming a protective film on the magnetic layer by means of a plasma CVD method using mixed gas of specific lower saturated hydrocarbon gas and specific lower unsaturated hydrocarbon gas as source gas, wherein the step (b) includes a step (b-1) of forming a first protective film on the magnetic layer and a step (b-2) of forming' a second protective film on the first protective film, the step (b-1) being performed by the plasma CVD method using a source gas in which a gas mixture ratio is adjusted such that the average number of hydrogen atoms per carbon atom in the source gas becomes greater than 2.5 but less than 3.0, and the step (b-2) being performed by the plasma CVD method using a source gas in which a gas mixture ratio is adjusted such that the- average number of hydrogen atoms per carbon atom in the source gas becomes greater than 2.0 but less than 2.5.

Classes IPC  ?

• G11B 5/84 - Procédés ou appareils spécialement adaptés à la fabrication de supports d'enregistrement

Abrégé

An object of the present invention is to provide a perpendicular magnetic recording medium in which crystal axis orientation dispersion, crystal grain diameter, and crystal grain diameter dispersion in a magnetic recording layer are reduced. The perpendicular magnetic recording medium of the present invention has a structure having, stacked sequentially on a non-magnetic substrate, at least an amorphous underlayer, a lower orientation control layer made of Ru or Ru alloy of an hep structure, an upper orientation control layer that is made of alloy containing an element selected from the group consisting of Co and Ni and an element selected from the group consisting of Cr, W, and Mo and that has an fee or hep structure, an intermediate layer, and a magnetic recording layer.

Classes IPC  ?

• G11B 5/667 - Supports d'enregistrement caractérisés par l'emploi d'un matériau spécifié comportant uniquement le matériau magnétique, sans produit de liaison les supports d'enregistrement étant constitués par plusieurs couches magnétiques comprenant une couche magnétique douce
• G11B 5/73 - Couches de base