Invention Grant
- Patent Title: Magnetic recording medium having magnetic layer with nitride of carbon or hydride of carbon, and magnetic storage apparatus
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Application No.: US16953894Application Date: 2020-11-20
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Publication No.: US11295775B2Publication Date: 2022-04-05
- Inventor: Kota Hasegawa , Katsuaki To
- 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: JPJP2018-055741 20180323
- Main IPC: G11B5/667
- IPC: G11B5/667 ; G11B5/65 ; G11B5/66

Abstract:
A magnetic recording medium includes a nonmagnetic substrate, a soft magnetic underlayer, an orientation control layer, a perpendicular magnetic layer, and a protection layer that are arranged in this order. The perpendicular magnetic layer includes a first magnetic layer and a second magnetic layer that are arranged in this order on the orientation control layer. The first magnetic layer has a granular structure including an oxide at grain boundary parts of magnetic grains, and the second magnetic layer is closest to the protection layer among layers within the perpendicular magnetic layer, and includes magnetic grains made of a CoCrPt alloy, and a nitride of carbon or a hydride of carbon.
Public/Granted literature
- US20210098017A1 MAGNETIC RECORDING MEDIUM AND MAGNETIC STORAGE APPARATUS Public/Granted day:2021-04-01
Information query
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