The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 05, 2013
Filed:
Jan. 26, 2010
Atsushi Hashimoto, Chiba, JP;
Yuzo Sasaki, Ichihara, JP;
Gohei Kurokawa, Ichihara, JP;
Showa Denko K.K., Tokyo, JP;
Abstract
There is provided a manufacturing method of a magnetic recording medium that maintains a high level of perpendicular orientation of a perpendicular magnetic layer and enables to further increase high recording density, prepared such that at least on a non-magnetic substrate, there are laminated a soft magnetic base layer, an orientation control layerthat controls the orientation of the layer immediately thereabove, and a perpendicular magnetic layer with a magnetization easy axis thereof primarily oriented perpendicular to the non-magnetic substrate. The manufacturing method is characterized in that when configuring the perpendicular magnetic layer with two or more magnetic layerstoand crystal-growing each layer so that the crystal grains that constitute the respective magnetic layersto, together with the crystal grains that constitute the orientation control layer, form column-shaped crystals Sto Sin a consecutive manner in the thickness direction, lamination of the orientation control layeris performed while the substrate is being cooled or immediately after the substrate has been cooled.