Invention Grant
- Patent Title: Method of producing a perpendicular magnetic recording medium and perpendicular magnetic recording medium
- Patent Title (中): 制造垂直磁记录介质和垂直磁记录介质的方法
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Application No.: US12935215Application Date: 2009-03-24
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Publication No.: US08623529B2Publication Date: 2014-01-07
- Inventor: Kouta Suzuki
- Applicant: Kouta Suzuki
- Applicant Address: SG Singapore
- Assignee: WD Media (Singapore) Pte. Ltd.
- Current Assignee: WD Media (Singapore) Pte. Ltd.
- Current Assignee Address: SG Singapore
- Priority: JP2008-088875 20080329
- International Application: PCT/JP2009/055794 WO 20090324
- International Announcement: WO2009/122963 WO 20091008
- Main IPC: G11B5/66
- IPC: G11B5/66

Abstract:
An object of the present invention is to provide a perpendicular magnetic recording medium including a suitable lubricating layer with sufficient durability, moisture resistance, and contamination resistance and also maintaining an R/W characteristic. In a typical structure of the present invention, a method of manufacturing a perpendicular magnetic recording medium 100 including a magnetic recording layer 122, a medium protective layer 126, and a lubricating layer 128 in this order on a base 110 includes: a CF bond density measuring step of measuring a CF bond density of a lubricant; and a lubricating layer forming step of forming a lubricating layer with the lubricant when the measured CF bond density is 2.0×1022 to 2.7×1022 atoms/cm3.
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