Invention Grant
- Patent Title: Perpendicular magnetic recording medium
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Application No.: US14627720Application Date: 2015-02-20
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Publication No.: US09697858B2Publication Date: 2017-07-04
- Inventor: Hirohisa Oyama , Kenichiro Soma , Isamu Sugai
- Applicant: FUJI ELECTRIC (MALAYSIA) SDN, BHD.
- Applicant Address: MY Kulim, Kedah Darul Aman
- Assignee: FUJI ELECTRIC (MALAYSIA) SDN, BHD.
- Current Assignee: FUJI ELECTRIC (MALAYSIA) SDN, BHD.
- Current Assignee Address: MY Kulim, Kedah Darul Aman
- Agency: Rossi, Kimms & McDowell LLP
- Main IPC: G11B5/66
- IPC: G11B5/66 ; G11B5/667 ; G11B5/73 ; G11B5/65 ; G11B5/738

Abstract:
A perpendicular magnetic recording medium is disclosed in which crystal axis orientation dispersion, crystal grain diameter, and crystal grain diameter dispersion in a magnetic recording layer are reduced. The perpendicular magnetic recording medium has a structure having, stacked sequentially on a non-magnetic substrate, at least an amorphous underlayer, a lower orientation control layer made of Ru or Ru alloy of an hcp structure, an upper orientation control layer that is made of alloy containing an element selected from the group consisting of Co and Ni and an element selected from the group consisting of Cr, W, and Mo and that has an fcc or hcp structure, an intermediate layer, and a magnetic recording layer.
Public/Granted literature
- US20150162043A1 PERPENDICULAR MAGNETIC RECORDING MEDIUM Public/Granted day:2015-06-11
Information query
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