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1. US20100221579 - Method for manufacturing magnetic recording layer having two or more layers

官庁 アメリカ合衆国
出願番号 12681270
出願日 02.10.2008
公開番号 20100221579
公開日 02.09.2010
特許番号 08529989
特許付与日 10.09.2013
公報種別 B2
IPC
G11B 5/66
G物理学
11情報記憶
B記録担体と変換器との間の相対運動に基づいた情報記録
5記録担体の磁化または減磁による記録;磁気的手段による再生;そのための記録担体
62材料の選択によって特徴づけられる記録担体
64結合材料をもたない磁性材料のみからなるもの
66記録層が多層よりなるもの
出願人 Kurokawa Gohei
Showa Denko K.K.
Sasaki Yuzo
発明者 Kurokawa Gohei
Sasaki Yuzo
代理人 Sughrue Mion, PLLC
優先権情報 P2007-259304 03.10.2007 JP
発明の名称
(EN) Method for manufacturing magnetic recording layer having two or more layers
要約
(EN)

The present invention relates to a method for manufacturing a perpendicular magnetic recording medium including a nonmagnetic substrate, and at least a soft magnetic under layer, an orientation control layer, a magnetic recording layer constituted of two or more layers and a protective layer formed on the nonmagnetic substrate, the method including a step of forming a first magnetic recording layer having a granular structure constituted of ferromagnetic crystal grains and crystal grain boundaries made of a nonmagnetic oxide or nitride on the nonmagnetic substrate side, a step of forming a second magnetic recording layer constituted only of ferromagnetic crystal grains, a step of forming a surface unevenness control layer for decreasing surface unevenness of the first magnetic recording layer located between the first magnetic recording layer and the second magnetic recording layer, and a step of heating the nonmagnetic substrate so as to decrease a surface roughness Ra of the second magnetic recording layer to less than 2 nm. The present invention also relates to a magnetic recording and reproducing apparatus using the magnetic recording medium.