Invention Grant
- Patent Title: Magnetic recording medium and magnetic storage apparatus
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Application No.: US15850226Application Date: 2017-12-21
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Publication No.: US10706884B2Publication Date: 2020-07-07
- Inventor: Takayuki Fukushima , Haruhisa Ohashi , Lei Zhang , Yuji Murakami , Hisato Shibata , Takehiro Yamaguchi , Tetsuya Kanbe
- 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@614cdd78
- Main IPC: G11B5/73
- IPC: G11B5/73 ; G11B5/65 ; C22C19/07 ; C22C27/06

Abstract:
A magnetic recording medium includes: a substrate; a first underlayer; a second underlayer; and a magnetic layer including an alloy having a L10 type crystal structure with a (001) orientation. The substrate, the first underlayer the second underlayer, and the magnetic layer are stacked in this order. The first underlayer is a crystalline layer that includes W as a main component. The second underlayer is a crystalline layer that includes a material containing W as a main component and that includes an oxide. The content of the oxide in the second underlayer is in a range of from 2 mol % to 30 mol %. The oxide is an oxide of one or more kinds of elements selected from a group consisting of Cr, Mo, Nb, Ta, V, and W.
Public/Granted literature
- US20180204591A1 MAGNETIC RECORDING MEDIUM AND MAGNETIC STORAGE APPARATUS Public/Granted day:2018-07-19
Information query
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