Invention Grant
- Patent Title: Magnetic recording medium and magnetic storage apparatus
- Patent Title (中): 磁记录介质和磁存储装置
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Application No.: US13901905Application Date: 2013-05-24
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Publication No.: US08830630B2Publication Date: 2014-09-09
- Inventor: Hideaki Takahoshi , Daisuke Amiya , Hiroshi Sakai
- Applicant: Showa Denko K.K.
- Applicant Address: JP Tokyo
- Assignee: Showa Denko K.K.
- Current Assignee: Showa Denko K.K.
- Current Assignee Address: JP Tokyo
- Agency: IPUSA, PLLC
- Priority: JP2012-145640 20120628
- Main IPC: G11B5/66
- IPC: G11B5/66 ; G11B5/65 ; G11B20/12 ; G11B20/10 ; G11B5/82

Abstract:
A magnetic recording medium may include a stacked structure of orientation control, lower recording, intermediate, and upper recording layers. The lower recording layer has a coercivity higher than that of the upper recording layer. The lower recording layer includes a first layer with a granular structure that includes magnetic particles including Co, Cr, and Pt, and an oxide covering a periphery of the magnetic particles, and a second layer with a non-granular structure that includes magnetic particles including Co, Cr, and Pt. The lower recording layer includes columnar crystals continuous with crystal particles forming the orientation control layer in a stacking direction of the stacked structure.
Public/Granted literature
- US20140002919A1 MAGNETIC RECORDING MEDIUM AND MAGNETIC STORAGE APPARATUS Public/Granted day:2014-01-02
Information query
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