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:
Jan. 26, 2016
Filed:
May. 14, 2012
Atsushi Hashimoto, Chiba, JP;
Atsushi Hashimoto, Chiba, JP;
SHOWA DENKO K.K., Tokyo, JP;
Abstract
Provided is a magnetic recording medium which maintains high vertical orientation of a vertical magnetic layer, and which is capable of realizing high recording densification. In the magnetic recording medium, at least a soft magnetic underlying layer (), seed layers (), an orientation control layer (), and a vertical magnetic layer are laminated in this order on the non-magnetic substrate. The soft magnetic underlying layer () has an amorphous or microcrystalline structure. The seed layers () include a first seed layer () formed from a metal oxide or a metal nitride, and a second seed layer () which is formed on the first seed layer and is formed from a metal formed with an island-shape or a net shape. In the orientation control layer () and the vertical magnetic layer, respective crystal grains constitute columnar crystals that are continuous in a thickness direction based on the second seed layer ().