Invention Grant
- Patent Title: Magnetic recording medium with nitride segregant, method for manufacturing same and magnetic recording and reproducing apparatus
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Application No.: US15831579Application Date: 2017-12-05
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Publication No.: US10832720B2Publication Date: 2020-11-10
- Inventor: Kota Hasegawa , Haruhisa Ohashi
- 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: com.zzzhc.datahub.patent.etl.us.BibliographicData$PriorityClaim@1c1c33d8
- Main IPC: G11B5/667
- IPC: G11B5/667 ; G11B5/73 ; G11B5/851 ; G11B5/65 ; G11B5/66

Abstract:
A magnetic recording medium includes a non-magnetic substrate, a soft magnetic underlayer, an orientation control layer, a perpendicular magnetic layer, and a protective layer arranged in this order. The perpendicular magnetic layer includes a first magnetic layer and a second magnetic layer from the non-magnetic substrate side in this order. The second magnetic layer contains a magnetic grain and provided farthest from the non-magnetic substrate. The first magnetic layer has a granular structure that contains an oxide in a grain boundary. The second magnetic layer has a granular structure that contains a nitride of an element contained in the magnetic grain in a grain boundary.
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