发明授权
- 专利标题: Disk having an underlayer that includes a plurality of nonmagnetic layers interleaved with magnetic layers
- 专利标题(中): 具有包括与磁性层交错的多个非磁性层的底层的磁盘
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申请号: US13118218申请日: 2011-05-27
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公开(公告)号: US08455119B1公开(公告)日: 2013-06-04
- 发明人: Hai Jiang , Kyusik Sin , Yingjian Chen
- 申请人: Hai Jiang , Kyusik Sin , Yingjian Chen
- 申请人地址: US CA Fremont
- 专利权人: Western Digital (Fremont), LLC
- 当前专利权人: Western Digital (Fremont), LLC
- 当前专利权人地址: US CA Fremont
- 主分类号: G11B5/66
- IPC分类号: G11B5/66
摘要:
A magnetic disk includes a substrate, a soft magnetic underlayer disposed over the substrate, and a media layer disposed over the underlayer. The underlayer includes a plurality of magnetic layers each containing FeCoN having an atomic concentration of iron that is greater than an atomic concentration of cobalt, and has an atomic concentration of nitrogen that is less than the atomic concentration of cobalt. The atomic concentration of nitrogen is less than eight percent. The underlayer includes a plurality of nonmagnetic layers that are interleaved with the magnetic layers. Each of the nonmagnetic layers has a thickness that is less than one-tenth that of an adjoining layer of the magnetic layers. The media layer contains a magnetically hard material having an easy axis of magnetization oriented substantially perpendicular to both the media layer and the underlayer.