发明申请
- 专利标题: Perpendicular magnetic recording medium and magnetic recording/reproducing apparatus
- 专利标题(中): 垂直磁记录介质和磁记录/再现装置
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申请号: US11081937申请日: 2005-03-17
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公开(公告)号: US20050214588A1公开(公告)日: 2005-09-29
- 发明人: Takeshi Iwasaki , Akira Kikitsu , Soichi Oikawa , Tomoyuki Maeda
- 申请人: Takeshi Iwasaki , Akira Kikitsu , Soichi Oikawa , Tomoyuki Maeda
- 申请人地址: JP Tokyo
- 专利权人: KABUSHIKI KAISHA TOSHIBA
- 当前专利权人: KABUSHIKI KAISHA TOSHIBA
- 当前专利权人地址: JP Tokyo
- 优先权: JP2004-090673 20040325
- 主分类号: G11B5/738
- IPC分类号: G11B5/738 ; G11B5/64 ; G11B5/65 ; G11B5/66 ; G11B5/667 ; G11B5/73 ; H01F10/16
摘要:
Disclosed is a perpendicular magnetic recording medium including: a nonmagnetic substrate; a first underlayer formed on the nonmagnetic substrate, mainly composed of at least two kinds selected from a group consisting of Fe2O3, CO3O4, MgO, MoO3, Mn3O4, SiO2, Al2O3, TiO2, and ZrO2, and having crystal grains growing in a columnar shape and crystal grain boundaries surrounding the crystal grains; a nonmagnetic second underlayer formed on the first underlayer and having crystal grains with one of a face-centered cubic structure and a hexagonal close-packed structure growing on the crystal grains of the first underlayer; a magnetic layer formed on the second underlayer; and a protective film formed on the magnetic layer.
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