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:
Aug. 24, 2010
Filed:
Oct. 09, 2007
Ryo Kurita, Kawasaki, JP;
Ryo Kurita, Kawasaki, JP;
Showa Denko K.K., Tokyo, JP;
Abstract
A perpendicular magnetic recording medium includes a substrate, a soft magnetic lining layer formed on the substrate, and a recording layer. The recording layer includes a first recording layer, an auxiliary recording layer, and a second recording layer that are laminated in this sequence. The first and the second recording layers are ferromagnetic layers that have a magnetization easy axis perpendicular to the layers. The auxiliary recording layer includes two or more magnetic particles mutually separated by non-magnetism members, wherein the magnetic particles are arranged approximately perpendicular to the layer and have the magnetization easy axis in a direction slanted with reference to the layer. The auxiliary recording layer is exchange-coupled with the adjoining first recording layer and second recording layer. The perpendicular magnetic recording medium may include an exchange-coupling-strength control layer between the first recording layer and the auxiliary recording layer, or alternatively, between the auxiliary recording layer and the second recording layer.