Invention Grant
- Patent Title: Magnetic recording medium and magnetic recording and reproducing apparatus
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Application No.: US15361658Application Date: 2016-11-28
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Publication No.: US10283155B2Publication Date: 2019-05-07
- Inventor: Ken Inoue , Kota Hasegawa
- 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: JP2016-015486 20160129
- Main IPC: G11B5/66
- IPC: G11B5/66

Abstract:
A magnetic recording medium includes a non-magnetic substrate on which at least a soft magnetic underlayer, an orientation control layer, a perpendicular magnetic layer, and a protective layer are disposed. The perpendicular magnetic layer includes first to fourth magnetic layers. A first exchange coupling control layer is disposed between the first magnetic layer and the second magnetic layer. A second exchange coupling control layer is disposed between the second magnetic layer and the third magnetic layer. Following relations are satisfied where Kui is a magnetic anisotropic constant of an i-th magnetic layer, Msi is a saturation magnetization of the i-th magnetic layer, and ti is a film thickness of the i-th magnetic layer, Ku1>Ku2, Ku2>Ku3, Ms1×t1>Ms2×t2, Ms2×t2>Ms3×t3, Ku3
Public/Granted literature
- US20170221515A1 MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING AND REPRODUCING APPARATUS Public/Granted day:2017-08-03
Information query
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