Process of producing a magnetic recording medium
AssigneeShowa Denko K.K.
InventorsAkira Sakawaki, Masato Kokubu, Ryuji Sakaguchi, Hiroshi Sakai
Life of this patent
Estimating the term…
Abstract
An object of the present invention is to provide a process for easily producing a magnetic recording medium exhibiting excellent magnetic characteristics. In the present invention, an orientation-determining film is formed on a non-metallic substrate which has undergone texturing, the orientation-determining film is subjected to oxidation or nitridation, and a non-magnetic undercoat film and a magnetic film are formed on the film.
Claims14
A process for producing a magnetic recording medium, comprising forming an orientation-determining film, which determines the crystal orientation of a film provided directly on the orientation-determining film, on a non-metallic substrate having a surface which has undergone texturing;
- subjecting the surface of the orientation-determining film to oxidation;
- and successively forming a non-magnetic undercoat film and a magnetic film on the orientation-determining film.
A process for producing a magnetic recording medium, comprising forming an orientation-determining film, which determines the crystal orientation of a film provided directly on the orientation-determining film, on a non-metallic substrate having a surface which has undergone texturing;
- subjecting the surface of the orientation-determining film to nitridation;
- and successively forming a non-magnetic undercoat film and a magnetic film on the orientation-determining film.
A process for producing a magnetic recording medium, comprising forming an orientation-determining film, which determines the crystal orientation of a film provided directly on the orientation-determining film, on a non-metallic substrate having a surface which has undergone texturing;
- and successively forming a non-magnetic undercoat film and a magnetic film on the orientation-determining film, wherein that the orientation-determining film is formed by sputtering using a sputtering gas containing nitrogen.
A process for producing a magnetic recording medium, comprising forming an orientation-determining film, which determines the crystal orientation of a film provided directly on the orientation-determining film, on a non-metallic substrate having a surface which has undergone texturing;
- and successively forming a non-magnetic undercoat film and a magnetic film on the orientation-determining film, wherein that the orientation-determining film is formed by sputtering using a sputtering gas containing oxygen.
Dependencies are inferred from the claim text.