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31. 发明申请

US20080180843A1 Perpendicular magnetic recording medium and hard disk drive using the same 有权
标题翻译：垂直磁记录介质和硬盘驱动器使用相同
公开(公告)号：US20080180843A1
公开(公告)日：2008-07-31
申请号：US12009415
申请日：2008-01-17
申请人： Zhengang Zhang , Ikuko Takekuma , Kiwamu Tanahashi
发明人： Zhengang Zhang , Ikuko Takekuma , Kiwamu Tanahashi
IPC分类号： G11B5/82 , G11B5/66 , G11B5/667
CPC分类号： G11B5/1278 , B82Y10/00 , G11B5/743 , G11B5/855
摘要： Embodiments of the present invention provide a perpendicular magnetic recording medium having an improved writing property due to the exchange spring effect and capable of stable production. According to one embodiment, a perpendicular magnetic recording medium includes a non-magnetic substrate; an adhesion layer; a soft magnetic underlayer; a seed layer; and intermediate layer; a magnetic recording layer at least including a perpendicular recording layer, a writing assist layer, and a magnetic coupling layer disposed between the perpendicular recording layer and the writing assist layer; a protective layer, and a lubrication layer, in which the saturation magnetization of the magnetic coupling layer is lower than the saturation magnetization of the writing assist layer, the saturation magnetization of the magnetic coupling layer is 300 kA/m (300 emu/cc) or lower, and the thickness of the magnetic coupling layer is 1 nm or more and 3 nm or lower.
摘要翻译：本发明的实施例提供一种垂直磁记录介质，由于交换弹簧效应而具有改进的书写特性并且能够稳定地生产。根据一个实施例，垂直磁记录介质包括非磁性基板; 粘合层; 软磁底层; 种子层; 和中间层; 至少包括垂直记录层的磁记录层，书写辅助层和设置在垂直记录层和书写辅助层之间的磁耦合层; 保护层和润滑层，其中磁耦合层的饱和磁化强度低于写入辅助层的饱和磁化强度，磁耦合层的饱和磁化强度为300kA / m（300emu / cc）或更低，并且磁耦合层的厚度为1nm以上且3nm以下。

32. 发明申请

US20060088737A1 Perpendicular magnetic recording medium with granular structured magnetic recording layer, method for producing the same, and magnetic recording apparatus 审中-公开
标题翻译：具有粒状结构磁记录层的垂直磁记录介质，其制造方法和磁记录装置
公开(公告)号：US20060088737A1
公开(公告)日：2006-04-27
申请号：US11258532
申请日：2005-10-24
申请人： Yoshiyuki Hirayama , Ikuko Takekuma , Ichiro Tamai
发明人： Yoshiyuki Hirayama , Ikuko Takekuma , Ichiro Tamai
IPC分类号： G11B5/65 , C23C14/00
CPC分类号： G11B5/7325 , C23C14/06 , C23C14/3492 , G11B5/65 , G11B5/851 , Y02T50/67
摘要： Embodiments of the invention provide a perpendicular magnetic recording medium having a granular structured magnetic recording layer including many columnar grains, and grain boundary layers containing oxide, wherein a high medium S/N ratio is obtained while securing head flyability and durability. In an embodiment, the perpendicular magnetic recording medium includes a granular structured magnetic recording layer having many columnar grains, as well as grain boundary layers including oxide respectively. Assuming that the columnar grains are divided equally in the film thickness direction into a protective layer side portion and an intermediate layer side portion, and the diameter of the protective layer side portion is larger than that of the intermediate layer side portion.
摘要翻译：本发明的实施例提供一种垂直磁记录介质，其具有包括许多柱状颗粒的粒状结构磁记录层和含有氧化物的晶界层，其中在确保磁头可飞行性和耐久性的同时获得高介质S / N比。在一个实施例中，垂直磁记录介质包括具有许多柱状晶粒的颗粒结构磁记录层以及分别包括氧化物的晶界层。假设柱状晶粒在膜厚度方向上被均等地分割成保护层侧部分和中间层侧部分，并且保护层侧部分的直径大于中间层侧部分的直径。

33. 发明申请

US20060057431A1 Perpendicular magnetic recording medium and manufacturing of the same 失效
标题翻译：垂直磁记录介质和制造相同
公开(公告)号：US20060057431A1
公开(公告)日：2006-03-16
申请号：US11227675
申请日：2005-09-14
申请人： Ichiro Tamai , Ikuko Takekuma , Yoshiyuki Hirayama , Yuzuru Hosoe , Yoshinori Honda
发明人： Ichiro Tamai , Ikuko Takekuma , Yoshiyuki Hirayama , Yuzuru Hosoe , Yoshinori Honda
IPC分类号： G11B5/66 , C23C14/00
CPC分类号： G11B5/7325 , G11B5/65 , G11B5/656
摘要： Embodiments of the embodiment are directed to reducing the inter-granular exchange coupling of an oxide granular medium and obtaining a high media S/N value, resulting in an areal recording density greater than 23 gigabits per square centimeter or more being achieved. In one embodiment, a magnetic recording medium comprises a structure laminating a soft-magnetic underlayer, a lower intermediate layer including Ru, an upper intermediate layer consisting of Ru crystal grains and oxide crystal grain boundaries, a magnetic recording layer consisting of crystal grains and oxide crystal grain boundaries, in order, on a substrate, growing crystal grains of the magnetic recording layer epitaxially on the Ru crystal grains of the upper intermediate layer, and growing the crystal grain boundaries of the magnetic recording layer on the crystal grain boundaries of the upper intermediate layer.
摘要翻译：实施例的实施例涉及减少氧化物颗粒介质的颗粒间交换耦合并获得高介质S / N值，导致实现大于23千兆比特/平方厘米或更大的面积记录密度。在一个实施例中，磁记录介质包括层压软磁性底层，包含Ru的下中间层，由Ru晶粒和氧化物晶界组成的上中间层的结构，由晶粒和氧化物组成的磁记录层晶粒边界依次在衬底上，外延地在上层中间层的Ru晶粒上生长磁记录层的晶粒，并且使上述记录层的晶界上的磁记录层的晶界生长中间层。

34. 发明申请

US20050058854A1 Perpendicular magnetic recording medium and manufacturing of the same 审中-公开
标题翻译：垂直磁记录介质和制造相同
公开(公告)号：US20050058854A1
公开(公告)日：2005-03-17
申请号：US10875601
申请日：2004-06-25
申请人： Ikuko Takekuma , Hiroyuki Nakagawa , Ichiro Tamai , Yoshiyuki Hirayama , Yuzuru Hosoe
发明人： Ikuko Takekuma , Hiroyuki Nakagawa , Ichiro Tamai , Yoshiyuki Hirayama , Yuzuru Hosoe
IPC分类号： G11B5/738 , G11B5/64 , G11B5/65 , G11B5/667 , G11B5/73 , G11B5/84 , G11B5/851 , G11B7/26
CPC分类号： G11B5/667 , G11B5/656
摘要： Disclosed here is a perpendicular magnetic recording medium for realizing a high media S/N value without degrading the magnetic isolation of crystal grains from each another. The perpendicular magnetic recording medium comprises a substrate, a soft magnetic underlayer formed on the substrate, an intermediate layer formed on the soft magnetic underlayer, and a magnetic recording layer formed on the intermediate layer. The intermediate layer consists of at least two or more layers and contains Ru or an Ru alloy and the magnetic recording layer is made of a material containing a CoCrPt alloy and oxygen. The crystallo graphic orientation of the recording layer can be improved enough without increasing the crystal grain size if a full width at half-maximum Δθ50 of the Rocking curves of the Ru (0002) diffraction peak measured by an X-ray diffraction method is 5° and under.
摘要翻译：这里公开的是用于实现高介质S / N值而不降低晶粒的磁隔离的垂直磁记录介质。垂直磁记录介质包括基板，形成在基板上的软磁性底层，形成在软磁性底层上的中间层和形成在中间层上的磁记录层。中间层由至少两层或更多层组成，并含有Ru或Ru合金，磁记录层由含有CoCrPt合金和氧的材料制成。如果通过X射线衍射法测量的Ru（0002）衍射峰的摇摆曲线的半最大值Deltatheta50的全宽为5°，则记录层的结晶图形取向可以足够改善，而不增加晶粒尺寸和下。

35. 发明申请

US20070254189A1 Magnetic storage device 审中-公开
标题翻译：磁存储装置
公开(公告)号：US20070254189A1
公开(公告)日：2007-11-01
申请号：US11726691
申请日：2007-03-21
申请人： Hiroyuki Nakagawa , Ikuko Takekuma
发明人： Hiroyuki Nakagawa , Ikuko Takekuma
IPC分类号： G11B5/66 , G11B5/65
CPC分类号： G11B5/66 , G11B5/11 , G11B5/1278 , G11B5/3146 , G11B5/315 , G11B5/656 , G11B2005/0029
摘要： Embodiments in accordance with the present invention achieve a higher recording than that of the prior art by using a perpendicular magnetic recording medium showing good recording reproduction characteristics in combination with a shielded pole head. A perpendicular magnetic recording medium and a shielded pole head are used. The shielded pole head comprises a single pole type writer having a main pole and an auxiliary pole, and a magnetic shield is provided via a non-magnetic gap layer so as to cover at least the down-track direction of trailing side of the main pole. The perpendicular magnetic recording medium has two recording layers. The first recording layer comprises ferromagnetic crystal grains having Co as principal component and containing at least Cr and Pt, and grain boundaries containing an oxide. The second recording layer comprises an alloy having Co as principal component, containing at least Cr, and not containing an oxide. The saturation magnetization Ms1 (kA/m) of the first recording layer, the saturation magnetization Ms2 (kA/m) of the second recording layer and the film thickness ts (nm) of the soft-magnetic underlayer satisfy the following relation: 20+0.033*ts2+2.3*ts≦4/3*Ms1−Ms2≦329−0.024*ts2+1.9*ts
摘要翻译：根据本发明的实施例通过使用显示良好记录再现特性的垂直磁记录介质与屏蔽极头组合，实现了比现有技术更高的记录。使用垂直磁记录介质和屏蔽极头。屏蔽极头包括具有主极和辅助极的单极型写入器，并且经由非磁隙层提供磁屏蔽，以便至少覆盖主极的后侧的向下轨道方向。垂直磁记录介质具有两个记录层。第一记录层包括具有Co作为主要成分并且至少含有Cr和Pt以及含有氧化物的晶界的铁磁性晶粒。第二记录层包括具有Co作为主要成分的至少包含Cr并且不含有氧化物的合金。第一记录层的饱和磁化强度Ms 1（kA / m），第二记录层的饱和磁化强度Ms 2（kA / m）和软磁性底层的膜厚度ts（nm）满足以下关系： <？in-line-formula description =“In-line Formulas”end =“lead”？> 20 + 0.033 * ts <2> + 2.3 * ts <= 4/3 * Ms1-Ms2 < 329-0.024 * ts <2> + 1.9 * ts <？in-line-formula description =“In-line Formulas”end =“tail”？>

36. 发明申请

US20060127703A1 Perpendicular magnetic recording medium for high density recording and manufacturing of the same 失效
标题翻译：用于高密度记录和制造的垂直磁记录介质
公开(公告)号：US20060127703A1
公开(公告)日：2006-06-15
申请号：US11295005
申请日：2005-12-05
申请人： Ikuko Takekuma , Reiko Arai , Yoko Ogawa , Yoshiyuki Hirayama , Yuzuru Hosoe , Tomio Iwasaki
发明人： Ikuko Takekuma , Reiko Arai , Yoko Ogawa , Yoshiyuki Hirayama , Yuzuru Hosoe , Tomio Iwasaki
IPC分类号： G11B5/66 , C23C14/00
CPC分类号： C23C14/568 , C23C14/025 , C23C14/0658 , C23C14/0688 , C23C14/584 , G11B5/65 , G11B5/732
摘要： Embodiments of the invention provide a medium which provides high media S/N and good corrosion resistance. According to one embodiment, in a perpendicular magnetic recording medium at least comprising a soft-magnetic underlayer, a seed layer, an intermediate layer, a magnetic recording layer and an overcoat layer which are stacked over a substrate in order, the magnetic recording layer has a granular structure which consists of many columnar grains of CoCrPt alloy and a grain boundary layer containing an oxide, the seed layer is made of TaNi alloy or TaTi alloy and the intermediate layer is made of Ru or Ru alloy which contains about 80 at. % Ru or more.
摘要翻译：本发明的实施方案提供了提供高介质S / N和良好耐腐蚀性的介质。根据一个实施例，在依次层叠在基板上的至少包括软磁性底层，种子层，中间层，磁记录层和覆盖层的垂直磁记录介质中，磁记录层具有由CoCrPt合金的许多柱状晶粒和含有氧化物的晶界层组成的粒状结构，种子层由TaNi合金或TaTi合金制成，中间层由含有约80at的Ru或Ru合金制成。％Ru或更多。

37. 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.

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