Invention Grant
- Patent Title: Perpendicular magnetic recording medium and magnetic storage apparatus
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Application No.: US14935529Application Date: 2015-11-09
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Publication No.: US09640213B2Publication Date: 2017-05-02
- Inventor: Kota Hasegawa , Takahiro Ukai , Eishin Yamakawa , Shiro Entani , Seiji Sakai
- Applicant: SHOWA DENKO K.K. , JAPAN ATOMIC ENERGY AGENCY
- Applicant Address: JP Tokyo JP Ibaraki
- Assignee: SHOWA DENKO K.K.,JAPAN ATOMIC ENERGY AGENCY
- Current Assignee: SHOWA DENKO K.K.,JAPAN ATOMIC ENERGY AGENCY
- Current Assignee Address: JP Tokyo JP Ibaraki
- Agency: IPUSA, PLLC
- Priority: JP2014-238394 20141126
- Main IPC: G11B5/66
- IPC: G11B5/66 ; G11B5/72 ; G11B5/82

Abstract:
A perpendicular magnetic recording medium includes a perpendicular magnetic layer provided above a nonmagnetic substrate, and a protection layer provided on the perpendicular magnetic layer. The perpendicular magnetic layer has an hcp structure, and includes stacked layers having a (0002) crystal plane oriented parallel to a surface of the nonmagnetic substrate. An uppermost layer amongst the stacked layers includes polycrystal grains selected from a CoCr-base alloy, a CoPt-base alloy, a CoCrPt-base alloy, and a CoPtCr-base alloy. The protection layer makes contact with the uppermost layer of the perpendicular magnetic layer, and includes a single graphene layer or a graphene stack, and an amorphous carbon layer. The single graphene layer or the graphene stack is bonded in parallel to a (0002) crystal plane of the polycrystal grains.
Public/Granted literature
- US20160148633A1 PERPENDICULAR MAGNETIC RECORDING MEDIUM AND MAGNETIC STORAGE APPARATUS Public/Granted day:2016-05-26
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