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US 2003/0199680 A1Published application
Magnetic recording medium, production process thereof, magnetic recording and reproducing apparatus, and sputtering target
AssigneeShowa Denko K.K.
InventorsAkira Sakawaki, Masato Kokubu, Ryuji Sakaguchi, Hiroshi Sakai
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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.
Claims10
A magnetic recording medium comprising a non-metallic substrate have a surface which has undergone texturing;
- an orientation-determining film which determines the crystal orientation of a film provided directly on the orientation-determining film, formed on the non-metallic substrate;
- and a non magnetic undercoat film and a magnetic film formed on the orientation-determining film, wherein the ratio of a coercive force in a radial direction of the medium (Hcr), Hcc/Hcr, is 1.1 or more.
Dependencies are inferred from the claim text.