Invention Grant
- Patent Title: Heat-assisted magnetic recording medium and magnetic storage apparatus
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Application No.: US16445801Application Date: 2019-06-19
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Publication No.: US10553242B2Publication Date: 2020-02-04
- Inventor: Lei Zhang , Takayuki Fukushima , Chen Xu , Kazuya Niwa , Hisato Shibata , Takehiro Yamaguchi , Tetsuya Kanbe , Tomoo Shige
- 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: JP2018-124049 20180629
- Main IPC: G11B5/65
- IPC: G11B5/65 ; G11B5/00

Abstract:
A heat-assisted magnetic recording medium includes: a substrate; an underlayer; and a magnetic layer that is (001)-oriented. In the magnetic layer, a first magnetic layer and a second magnetic layer are stacked in this order from the underlayer side. The first magnetic layer and the second magnetic layer include an alloy having an L10 structure. The second magnetic layer includes a ferrite at grain boundaries of magnetic grains. The ferrite is one or more kinds selected from the group consisting of NiFe2O4, MgFe2O4, MnFe2O4, CuFe2O4, ZnFe2O3, CoFe2O4, BaFe2O4, SrFe2O4, and Fe3O4. A Curie temperature of the magnetic grains is lower than a Curie temperature of the ferrite.
Public/Granted literature
- US20200005821A1 HEAT-ASSISTED MAGNETIC RECORDING MEDIUM AND MAGNETIC STORAGE APPARATUS Public/Granted day:2020-01-02
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