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51. 发明申请

US20090023016A1 Perpendicular magnetic recording medium 审中-公开
标题翻译：垂直磁记录介质
公开(公告)号：US20090023016A1
公开(公告)日：2009-01-22
申请号：US12218683
申请日：2008-07-16
申请人： Kiwamu Tanahashi , Ichiro Tamai
发明人： Kiwamu Tanahashi , Ichiro Tamai
IPC分类号： G11B5/66 , B32B37/00
CPC分类号： G11B5/7325 , G11B5/65 , G11B5/66 , G11B5/667 , G11B5/72 , G11B5/725 , G11B5/7379
摘要： Embodiments of the present invention help to provide a perpendicular magnetic recording medium in which a perpendicular magnetic recording layer is formed via a soft magnetic under-layer on a disk substrate, whereby the error rate is reduced and high density recording is enabled. According to one embodiment, the disk substrate is textured so that the center line average height (Ra) is from 0.05 nm to 0.2 nm, in which the soft magnetic under-layer is amorphous and has a film thickness from 2.5 nm to 10 nm, and the magnetic field for saturation (Hs) of the perpendicular magnetic recording layer is 7 kOe or less.
摘要翻译：本发明的实施例有助于提供一种垂直磁记录介质，其中通过盘基底上的软磁底层形成垂直磁记录层，从而降低误差率并实现高密度记录。根据一个实施例，盘基片被纹理化，使得中心线平均高度（Ra）为0.05nm至0.2nm，其中软磁底层为无定形且膜厚为2.5nm至10nm，并且垂直磁记录层的饱和磁场（Hs）为7kOe以下。

52. 发明申请

US20080113221A1 Perpendicular magnetic recording medium and magnetic storage apparatus using the same 有权
标题翻译：垂直磁记录介质及使用其的磁存储装置
公开(公告)号：US20080113221A1
公开(公告)日：2008-05-15
申请号：US11985310
申请日：2007-11-13
申请人： Yoshiyuki Hirayama , Ichiro Tamai , Reiko Arai
发明人： Yoshiyuki Hirayama , Ichiro Tamai , Reiko Arai
IPC分类号： G11B5/33
CPC分类号： G11B5/65 , G11B5/7325 , G11B5/851 , Y10T428/11
摘要： Embodiments in accordance with the present invention help to obtain a perpendicular magnetic recording medium having a granular structure, excellent recording/reproducing properties, and excellent durability. According to one embodiment, a recording layer includes a layer which has crystal grains mainly composed of cobalt and crystal grain boundaries mainly composed of the oxide; the oxygen content of the recoding layer is changed in the film thickness direction; the oxygen content in the area in the vicinity of the interface between the recording layer and the intermediate layer is made lower than the oxygen content in the area in the vicinity of the center of the recording layer; and the oxygen content in the area in the vicinity of the interface between the recording layer and the protective layer is made lower than the oxygen content in the area in the vicinity of the center of the recording layer.
摘要翻译：根据本发明的实施例有助于获得具有颗粒结构的良好的记录/再现性能和优异的耐久性的垂直磁记录介质。根据一个实施例，记录层包括主要由钴构成的晶粒和主要由氧化物构成的晶界的层; 记录层的氧含量在膜厚方向上变化; 记录层和中间层之间的界面附近的区域中的氧含量低于记录层中心附近的区域中的氧含量; 并且将记录层和保护层之间的界面附近的区域中的氧含量设定得低于记录层中心附近的区域中的氧含量。

53. 发明申请

US20070188924A1 Perpendicular magnetic recording medium and magnetic storage apparatus using the same 有权
标题翻译：垂直磁记录介质及使用其的磁存储装置
公开(公告)号：US20070188924A1
公开(公告)日：2007-08-16
申请号：US11651922
申请日：2007-01-09
申请人： Ichiro Tamai , Ikuko Takekuma , Hiroaki Nemoto , Yoshiyuki Hirayama
发明人： Ichiro Tamai , Ikuko Takekuma , Hiroaki Nemoto , Yoshiyuki Hirayama
IPC分类号： G11B5/82
CPC分类号： G11B5/66 , G11B5/656 , G11B5/667
摘要： Embodiments in accordance with the present invention provide a perpendicular recording medium with low noise and high recording density by reducing the effects from noise generated from the vicinity of the interface with the intermediate layer of the recording layer, in a perpendicular recording medium utilizing a granular recording layer containing oxygen or oxide additive in a cobalt-chromium alloy formed on an intermediate layer with a ruthenium or ruthenium alloy layer. A first recording layer and a second recording layer are formed in order on an intermediate layer of ruthenium or ruthenium alloy. The first recording layer and the second recording layer are comprised of cobalt as the main material in a granular structure containing chromium and oxygen. The saturation magnetization of the first recording layer is lower than the saturation magnetization of the second recording layer. When a first recording layer saturation magnetization is set as Ms1 (emu per cubic centimeter), a second recording layer saturation magnetization is set as Ms2 (emu per cubic centimeter), and the first recording layer film thickness is set to t1 (nm), then (Ms2−Ms1)×t1 will be larger than 0 (memu per square centimeter) and smaller than 0.15 (memu per square centimeter).
摘要翻译：根据本发明的实施例通过减少在与记录层的中间层的界面附近产生的噪声的影响，在使用粒状记录的垂直记录介质中提供具有低噪声和高记录密度的垂直记录介质在含有钌或钌合金层的中间层上形成的钴 - 铬合金中含有氧或氧化物添加剂的层。在钌或钌合金的中间层上依次形成第一记录层和第二记录层。第一记录层和第二记录层由包含铬和氧的颗粒结构中的钴作为主要材料组成。第一记录层的饱和磁化强度低于第二记录层的饱和磁化强度。当第一记录层的饱和磁化强度设定为Ms 1（emu /立方厘米）时，第二记录层的饱和磁化强度设定为Ms 2（emu每立方厘米），第一记录层膜厚设定为t 1（ nm），则（Ms 2 -Ms 1）xt 1将大于0（每平方厘米的记忆）并小于0.15（每平方厘米的记忆）。

54. 发明申请

US20060134467A1 Perpendicular magnetic recording medium and method of manufacturing it 失效
公开(公告)号：US20060134467A1
公开(公告)日：2006-06-22
申请号：US11354085
申请日：2006-02-15
申请人： Yoshiyuki Hirayama , Ichiro Tamai , Takayuki Ichihara , Hiroyuki Nakagawa , Hiroaki Nemoto , Mineaki Kodama , Ikuko Takekuma
发明人： Yoshiyuki Hirayama , Ichiro Tamai , Takayuki Ichihara , Hiroyuki Nakagawa , Hiroaki Nemoto , Mineaki Kodama , Ikuko Takekuma
IPC分类号： G11B5/66 , C23C14/00
CPC分类号： G11B5/65 , G11B5/656 , G11B5/66 , G11B5/667 , G11B5/732 , G11B5/7325 , G11B5/84
摘要： Disclosed are a perpendicular magnetic recording medium with lower medium noise, insusceptible to thermal fluctuation and high recording resolution and a method of manufacturing it. As the step of forming a metal layer at the time of forming a recording layer on a non-magnetic substrate via a plurality of underlayers and the step of forming an oxide layer with an average thickness of 0.2 nm or less are repeated, the crystal grains are magnetically isolated without disturbing the orientation of the crystal grain of the recording layer of the perpendicular magnetic recording medium or without degrading the magnetic characteristic of the crystal grain of the recording layer.

55. 发明申请

US20060088736A1 Perpendicular magnetic recording medium and manufacturing of the same 失效
公开(公告)号：US20060088736A1
公开(公告)日：2006-04-27
申请号：US11257978
申请日：2005-10-24
申请人： Takayuki Ichihara , Hiroyuki Nakagawa , Ikuko Takekuma , Ichiro Tamai
发明人： Takayuki Ichihara , Hiroyuki Nakagawa , Ikuko Takekuma , Ichiro Tamai
IPC分类号： G11B5/65 , C23C14/00
CPC分类号： C23C14/34 , G11B5/656 , G11B5/667 , G11B5/851
摘要： In a granular magnetic recording layer of a perpendicular magnetic recording medium, media noises are reduced by separating adequately magnetic crystal grains and non-magnetic grain boundary and decreasing magnetic exchange interactions among the magnetic crystal grains without causing damage to magnetic anisotropy of the magnetic crystal grains. In one embodiment, the perpendicular magnetic recording medium, in which crystal alloy grains containing Co, Pt, and Cr, and non-magnetic grain boundary containing Si and O is included; the ratio of the number of O atom to that of Si atom in the magnetic recording layer is between about 2.5 and 5; the Si atomic composition in the magnetic recording layer is between about 3 and 6 atomic %; and the O atomic composition in the magnetic recording layer is between about 12 and 20 atomic %, is used. The in-plane distribution of perpendicular coercivity at any points of the medium of the magnetic recording layer is made at most about ±10% of an average value.

56. 发明申请

US20050227121A1 Perpendicular magnetic recording media 失效
标题翻译：垂直磁记录介质
公开(公告)号：US20050227121A1
公开(公告)日：2005-10-13
申请号：US11148164
申请日：2005-06-09
申请人： Yoshiyuki Hirayama , Hiroyuki Nakagawa , Hiroaki Nemoto , Ichiro Tamai , Ikuko Takekuma
发明人： Yoshiyuki Hirayama , Hiroyuki Nakagawa , Hiroaki Nemoto , Ichiro Tamai , Ikuko Takekuma
IPC分类号： G11B5/65 , B32B3/00 , G11B5/147 , G11B5/64 , G11B5/66 , G11B5/667 , G11B5/70 , G11B5/73 , G11B5/851
CPC分类号： B82Y10/00 , G11B5/656 , G11B5/66 , G11B5/7325 , G11B5/743 , Y10T428/24802
摘要： A perpendicular magnetic recording medium includes an intermediate film formed of a plurality of layers between a soft magnetic film and a perpendicular magnetization film. The intermediate film includes at least two layers, i.e., an oxygen-containing layer, or a nonmetallic element-containing layer containing nitrogen, silicon or carbon, and a metallic layer formed on a surface side of the oxygen-containing layer or the nonmetallic element-containing layer. The metallic layer includes a plurality of isolated island-shaped structures. Crystal grains of the perpendicular magnetization film are formed so as to correspond to the isolated island-shaped structures. As a result, a high recording density is obtained.
摘要翻译：垂直磁记录介质包括由软磁膜和垂直磁化膜之间的多层形成的中间膜。中间膜包括至少两层，即含氧层或含有氮，硅或碳的非金属元素层，以及在含氧层或非金属元素的表面侧上形成的金属层包含层。金属层包括多个孤立的岛状结构。垂直磁化膜的晶粒形成为对应于孤立的岛状结构。结果，获得高记录密度。

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