Invention Grant
- Patent Title: Perpendicular magnetic recording medium
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Application No.: US14560708Application Date: 2014-12-04
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Publication No.: US09672855B2Publication Date: 2017-06-06
- Inventor: Hiroyasu Kataoka , Hiroto Kikuchi , Akira Furuta , Shinji Uchida , Takehito Shimatsu
- Applicant: FUJI ELECTRIC CO., LTD.
- Applicant Address: JP Kawasaki-Shi
- Assignee: FUJI ELECTRIC CO., LTD.
- Current Assignee: FUJI ELECTRIC CO., LTD.
- Current Assignee Address: JP Kawasaki-Shi
- Agency: Rabin & Berdo, P.C.
- Priority: JP2012-267588 20121206
- Main IPC: G11B5/66
- IPC: G11B5/66 ; G11B5/65

Abstract:
A perpendicular magnetic recording medium includes at least a nonmagnetic substrate and a magnetic recording layer. The magnetic recording layer is constituted by a plurality of layers that includes at least a first magnetic recording layer and a second magnetic recording layer. The first magnetic recording layer has a granular structure that includes first magnetic crystal grains and first nonmagnetic crystal grain boundaries surrounding the first magnetic crystal grains. The first magnetic crystal grains include an ordered alloy, and the first nonmagnetic crystal grain boundaries are constituted by carbon. The second magnetic recording layer has a granular structure that includes second magnetic crystal grains and a second nonmagnetic crystal grain boundaries that surround the second magnetic crystal grains. The second magnetic crystal grains include an ordered alloy, and the second nonmagnetic crystal grain boundaries are constituted by a carbon-containing nonmagnetic material.
Public/Granted literature
- US20150132608A1 PERPENDICULAR MAGNETIC RECORDING MEDIUM Public/Granted day:2015-05-14
Information query
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