Invention Grant
- Patent Title: Perpendicular magnetic recording medium, and perpendicular magnetic recording and reproducing apparatus
- Patent Title (中): 垂直磁记录介质和垂直磁记录和再现设备
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Application No.: US11886635Application Date: 2006-03-29
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Publication No.: US07879466B2Publication Date: 2011-02-01
- Inventor: Migaku Takahashi , Masahiro Oka , Akira Kikitsu
- Applicant: Migaku Takahashi , Masahiro Oka , Akira Kikitsu
- Applicant Address: JP Miyagi-ken JP Tokyo JP Tokyo
- Assignee: Tohoku University,Showa Denko K.K.,Kabushiki Kaisha Toshiba
- Current Assignee: Tohoku University,Showa Denko K.K.,Kabushiki Kaisha Toshiba
- Current Assignee Address: JP Miyagi-ken JP Tokyo JP Tokyo
- Agency: Sughrue Mion, PLLC
- Priority: JP2005-100020 20050330
- International Application: PCT/JP2006/307178 WO 20060329
- International Announcement: WO2006/107068 WO 20061012
- Main IPC: G11B5/65
- IPC: G11B5/65 ; G11B5/667
Abstract:
The invention provides a perpendicular recording medium with high recording density, and a magnetic recording and reproducing apparatus, by improving the function of magnetic anisotropy of a soft magnetic underlayer. The perpendicular recording medium has at least a soft magnetic underlayer and a perpendicular magnetic recording layer on a non-magnetic substrate, wherein when Ku⊥ (erg/cm3) is defined as a perpendicular magnetic anisotropic energy, and Ms (emu/cm 3) is defined as a saturation magnetization of the soft magnetic underlayer, Ku⊥ of the soft magnetic underlayer has a negative value and Ku⊥
Public/Granted literature
- US20090034119A1 Perpendicular Magnetic Recording Medium, and Perpendicular Magnetic Recording and Reproducing Apparatus Public/Granted day:2009-02-05
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