Invention Grant
- Patent Title: Magnetic recording medium with a plurality of pinning portions in the magnetic layer
- Patent Title (中): 在磁性层中具有多个钉扎部分的磁记录介质
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Application No.: US13303479Application Date: 2011-11-23
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Publication No.: US08877360B2Publication Date: 2014-11-04
- Inventor: Soichi Oikawa
- Applicant: Soichi Oikawa
- Applicant Address: JP Tokyo
- Assignee: Kabushiki Kaisha Toshiba
- Current Assignee: Kabushiki Kaisha Toshiba
- Current Assignee Address: JP Tokyo
- Agency: Patterson & Sheridan, LLP
- Priority: JP2011-091446 20110415
- Main IPC: G11B5/673
- IPC: G11B5/673 ; G11B5/73 ; G11B5/65 ; G11B5/66

Abstract:
According to one embodiment, a perpendicular magnetic recording medium includes a substrate, and a multilayered magnetic recording layer formed on the substrate by alternately stacking two or more magnetic layers and two or more nonmagnetic layers. The magnetic layers and nonmagnetic layers of the multilayered magnetic recording layer are continuous layers. The magnetic layer includes a magnetic material portion, and a plurality of pinning sites dispersed in the magnetic material portion and made of a nonmagnetic metal different from a nonmagnetic material as a main component of the nonmagnetic layer. This perpendicular magnetic recording medium has magnetic characteristics by which a gradient α of a magnetization curve near the coercive force is 5 or more.
Public/Granted literature
- US20120263975A1 MAGNETIC RECORDING MEDIUM Public/Granted day:2012-10-18
Information query
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