Invention Grant
- Patent Title: Patterned-media perpendicular magnetic recording disk with servo regions having magnetized servo pillars and oppositely-magnetized servo trenches
- Patent Title (中): 具有磁化伺服柱和相对磁化的伺服沟槽的伺服区域的图案化介质垂直磁记录盘
-
Application No.: US12412548Application Date: 2009-03-27
-
Publication No.: US07960044B2Publication Date: 2011-06-14
- Inventor: Thomas R Albrecht , Zvonimir Z. Bandic , Olav Hellwig , Gabriel Zeltzer
- Applicant: Thomas R Albrecht , Zvonimir Z. Bandic , Olav Hellwig , Gabriel Zeltzer
- Applicant Address: NL Amsterdam
- Assignee: Hitachi Global Storage Technologies Netherlands B.V.
- Current Assignee: Hitachi Global Storage Technologies Netherlands B.V.
- Current Assignee Address: NL Amsterdam
- Agent Thomas R. Berthold
- Main IPC: G11B5/66
- IPC: G11B5/66

Abstract:
A patterned perpendicular magnetic recording disk has a pre-patterned disk substrate with pillars and trenches arranged in data regions and servo regions. In the data regions, the height of the data pillars is equal to or greater than the spacing between the data pillars, while in the servo regions the height of the servo pillars is less than the spacing between the servo pillars. A magnetic recording material with perpendicular magnetic anisotropy is deposited over the entire disk substrate, which results in magnetic material on the tops of the data pillars and servo pillars and in the servo trenches. The material in the data trenches is either nonmagnetic or discontinuous. After the application of a high DC magnetic field in one perpendicular direction and a low DC magnetic field in the opposite direction, the resulting disk has patterned servo sectors with servo pillars all magnetized in the same perpendicular direction and servo trenches magnetized in the opposite perpendicular direction.
Public/Granted literature
Information query
IPC分类: