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1. 发明授权

US07205020B2 Magnetic recording medium and method for manufacturing same 有权
标题翻译：磁记录介质及其制造方法
公开(公告)号：US07205020B2
公开(公告)日：2007-04-17
申请号：US10757901
申请日：2004-01-14
申请人： Tadaaki Oikawa , Hiroyuki Uwazumi , Takahiro Shimizu , Naoki Takizawa
发明人： Tadaaki Oikawa , Hiroyuki Uwazumi , Takahiro Shimizu , Naoki Takizawa
IPC分类号： B05D5/12
CPC分类号： G11B5/66 , G11B5/84 , Y10T428/1259 , Y10T428/12611 , Y10T428/12861 , Y10T428/12868
摘要： A magnetic recording medium has a non-magnetic under-layer, a magnetic layer, a protective film and a liquid lubricant layer sequentially laminated on a non-magnetic substrate. The magnetic layer has a multi-layer structure laminated with two or more magnetic layer components, each of the magnetic layer components having ferromagnetic grains and non-magnetic grain boundaries surrounding the grain. The resulting magnetic recording medium has a granular magnetic layer exhibiting very high Hc accompanying high density of magnetic recording, while decreasing the amount of platinum needed for attaining the high Hc, and reducing media noise accompanying the high recording density.
摘要翻译：磁记录介质具有顺序层叠在非磁性基板上的非磁性底层，磁性层，保护膜和液体润滑剂层。磁性层具有层叠有两层以上的磁性层成分的多层结构，所述磁性层成分各自具有铁磁性粒子和包围该粒子的非磁性晶界。所得磁记录介质具有伴随高记录密度显示出非常高的Hc的颗粒磁性层，同时减少获得高Hc所需的铂量，并且降低伴随高记录密度的介质噪声。

2. 发明授权

US07183013B2 Magnetic recording medium and manufacturing method thereof 有权
标题翻译：磁记录介质及其制造方法
公开(公告)号：US07183013B2
公开(公告)日：2007-02-27
申请号：US10764813
申请日：2004-01-26
申请人： Tadaaki Oikawa , Takahiro Shimizu , Hiroyuki Uwazumi , Naoki Takizawa
发明人： Tadaaki Oikawa , Takahiro Shimizu , Hiroyuki Uwazumi , Naoki Takizawa
IPC分类号： G11B5/66 , G11B5/70
CPC分类号： G11B5/7325 , G11B5/65 , G11B5/656 , G11B5/8404
摘要： A nonmagnetic foundation layer is made to have a body-centered cubic crystal structure with a preferred crystal orientation plane being the bcc (110) plane. A nonmagnetic intermediate layer, provided between the foundation layer and a granular magnetic layer, has a hexagonal close-packed structure with the hcp (100) plane or the hcp (200) plane being the preferred orientation plane. Furthermore, the crystal lattice misfit amount between the nonmagnetic intermediate layer 3 and the granular magnetic layer is made to be not more than 10% for each of an a-axis and a c-axis. As a result, epitaxial growth of ferromagnetic crystals in the granular magnetic layer, which has an hcp structure, is promoted, and hence the crystallinity of the magnetic layer is increased, and thus it becomes possible to simultaneously realize an increase in coercivity and a reduction in noise. Depositing the layers on an unheated substrate yields reduces manufacturing costs.
摘要翻译：将非磁性基础层制成具有体心立方晶体结构，其中优选的晶体取向平面是bcc（110）面。设置在基础层和粒状磁性层之间的非磁性中间层具有hcp（100）面或hcp（200）面为优选取向面的六方密堆积结构。此外，非磁性中间层3和粒状磁性层之间的晶格失配量对于a轴和c轴分别为10％以下。结果，促进了具有hcp结构的粒状磁性层中的铁磁晶体的外延生长，因此磁性层的结晶度增加，因此可以同时实现矫顽力的提高和还原在噪音将层沉积在未加热的基底上会降低制造成本。

3. 发明授权

US07183011B2 Magnetic recording medium 有权
标题翻译：磁记录介质
公开(公告)号：US07183011B2
公开(公告)日：2007-02-27
申请号：US10346838
申请日：2003-01-17
申请人： Miyabi Nakamura , Takahiro Shimizu , Hiroyuki Uwazumi , Naoki Takizawa , Tadaaki Oikawa
发明人： Miyabi Nakamura , Takahiro Shimizu , Hiroyuki Uwazumi , Naoki Takizawa , Tadaaki Oikawa
IPC分类号： G11B5/64
CPC分类号： G11B5/732 , G11B5/7325
摘要： A magnetic recording medium for perpendicular magnetic recording system includes a nonmagnetic substrate and layers sequentially laminated on the substrate. The layers include a seed layer comprised of a metal or an alloy with a face centered cubic crystal structure, a nonmagnetic underlayer of a metal or an alloy with a hexagonal closest packed crystal structure, a magnetic layer having a granular structure including ferromagnetic crystalline grains with a hexagonal closest packed structure and nonmagnetic grain boundary region of mainly oxide surrounding the crystalline grains, a protective layer, and a liquid lubricant layer.
摘要翻译：用于垂直磁记录系统的磁记录介质包括非磁性衬底和顺序层压在衬底上的层。这些层包括由金属或具有面心立方晶体结构的合金构成的种子层，金属的非磁性底层或具有六方最接近的堆积晶体结构的合金，具有包含铁磁性晶粒的粒状结构的磁性层，主要包围晶粒的氧化物的六方最密堆积结构和非磁性晶界区域，保护层和液体润滑剂层。

4. 发明授权

US06673475B2 Magnetic recording medium and manufacturing method therefore 失效
标题翻译：磁记录介质及其制造方法
公开(公告)号：US06673475B2
公开(公告)日：2004-01-06
申请号：US09976248
申请日：2001-10-11
申请人： Tadaaki Oikawa , Hiroyuki Uwazumi , Takahiro Shimizu , Naoki Takizawa
发明人： Tadaaki Oikawa , Hiroyuki Uwazumi , Takahiro Shimizu , Naoki Takizawa
IPC分类号： G11B566
CPC分类号： G11B5/732 , G11B5/66 , G11B5/7325 , Y10S428/90 , Y10T428/265
摘要： A magnetic recording medium achieves excellent noise reduction by controlling the crystal orientation of a magnetic layer without thermal processing. The magnetic recording medium includes multiple layers laminated to a substrate. These layers include at least the magnetic layer and a non-magnetic under layer. The magnetic layer has a granular structure consisting of ferromagnetic grains with a hexagonal close-packed structure and non-magnetic grain boundaries composed mainly oxide or a nitride. The non-magnetic under-layer is a material having a body centered cubic crystal structure with a preferential orientation along a (200) plane parallel to a film surface of the under-layer.
摘要翻译：通过控制磁性层的晶体取向而不进行热处理，磁记录介质实现了优异的降噪。磁记录介质包括层压到基板上的多层。这些层至少包括磁性层和非磁性底层。磁性层具有由六方密堆积结构的铁磁性晶粒和主要由氧化物或氮化物构成的非磁性晶界组成的粒状结构。非磁性底层是具有体心立方晶体结构的材料，其沿着平行于底层的膜表面的（200）平面具有优先取向。

5. 发明授权

US06994924B2 Magnetic recording medium and manufacture method therefor 失效
公开(公告)号：US06994924B2
公开(公告)日：2006-02-07
申请号：US10273364
申请日：2002-10-18
申请人： Tadaaki Oikawa , Takahiro Shimizu , Hiroyuki Uwazumi , Naoki Takizawa , Myabi Nakamura
发明人： Tadaaki Oikawa , Takahiro Shimizu , Hiroyuki Uwazumi , Naoki Takizawa , Myabi Nakamura
IPC分类号： G11B5/66 , G11B5/70
CPC分类号： G11B5/732 , G11B5/65 , G11B5/7325
摘要： A magnetic recording medium and a manufacturing method therefore includes a protective film, a nonmagnetic substrate, a nonmagnetic base layer, a nonmagnetic intermediate layer, a magnetic layer, and a liquid lubricant layer. The nonmagnetic base layer has a body-centered cubic structure and a (200) plane including a crystal-orientation parallel with a surface of the protective film. The nonmagnetic intermediate layer has a hexagonal close-packed structure and a (110) plane including a crystal-orientation parallel with the surface of the protective film. The magnetic layer has a granular structure including hexagonal close-packed ferromagnetic crystal grains and oxide-based nonmagnetic grain boundaries surrounding the ferromagnetic crystal grains. The nonmagnetic base layer, the nonmagnetic intermediate layer, the magnetic layer, the protective film, and the liquid lubricant layer are sequentially stacked on the nonmagnetic substrate.

6. 发明授权

US06767651B2 Magnetic recording medium, method for manufacturing a magnetic recording medium and magnetic recording device 失效
标题翻译：磁记录介质，磁记录介质的制造方法和磁记录装置
公开(公告)号：US06767651B2
公开(公告)日：2004-07-27
申请号：US10037475
申请日：2002-01-03
申请人： Hiroyuki Uwazumi , Tadaaki Oikawa , Takahiro Shimizu , Naoki Takizawa
发明人： Hiroyuki Uwazumi , Tadaaki Oikawa , Takahiro Shimizu , Naoki Takizawa
IPC分类号： G11B5738
CPC分类号： G11B5/7325 , Y10T428/1259 , Y10T428/12611 , Y10T428/12847 , Y10T428/12854
摘要： In a magnetic recording medium, a plurality of non-magnetic metallic intermediate layers is laminated between an under-layer and a magnetic layer. One of the intermediate layers is composed of at least an element selected from the group consisting of Ru, Re and Os and contains oxygen, and another is composed of a CoCr alloy containing at least an element selected from the group consisting of Nb, Mo, Ru, Rh, Pd, Ta, W, Re Os, Ir and Pt. The resulting magnetic recording medium provides reduced costs and improved recording characteristics.
摘要翻译：在磁记录介质中，在下层和磁性层之间层叠多个非磁性金属中间层。中间层中的一个由至少一种选自Ru，Re和Os的元素组成并含有氧，另一个由含有至少一种选自Nb，Mo， Ru，Rh，Pd，Ta，W，Re Os，Ir和Pt。所得到的磁记录介质提供降低的成本和改进的记录特性。

7. 发明授权

US08039133B2 Magnetic recording medium and method for manufacturing the same 有权
标题翻译：磁记录介质及其制造方法
公开(公告)号：US08039133B2
公开(公告)日：2011-10-18
申请号：US11114578
申请日：2005-04-26
申请人： Miyabi Nakamura , Takahiro Shimizu , Hiroyuki Uwazumi , Naoki Takizawa , Tadaaki Oikawa
发明人： Miyabi Nakamura , Takahiro Shimizu , Hiroyuki Uwazumi , Naoki Takizawa , Tadaaki Oikawa
IPC分类号： G11B5/66
CPC分类号： G11B5/656 , G11B5/712 , G11B5/851 , Y10S428/90 , Y10T428/12465
摘要： A magnetic recording medium, and method of manufacturing the same, is provided with excellent recording performance by employing a granular magnetic layer having a specified composition. A magnetic recording medium according to the present invention comprises a nonmagnetic underlayer, a granular magnetic layer, a protective film, and a liquid lubrication layer sequentially laminated on a nonmagnetic substrate. The granular magnetic layer consists of ferromagnetic crystal grains containing cobalt and nonmagnetic grain boundary region surrounding the ferromagnetic crystal grains. The ferromagnetic crystal grains contain platinum in the range of 15 at % to 17 at %.
摘要翻译：磁记录介质及其制造方法通过采用具有特定组成的粒状磁性层而具有良好的记录性能。根据本发明的磁记录介质包括顺序层压在非磁性基底上的非磁性底层，粒状磁性层，保护膜和液体润滑层。颗粒状磁性层由铁磁性晶粒构成，包含铁磁性晶粒周围的钴和非磁性晶界。铁磁晶粒含有15原子％至17原子％的铂。

8. 发明授权

US07247395B2 Magnetic recording medium exhibiting low noise and high coercive force 有权
标题翻译：表现出低噪音，高矫顽力的磁记录介质
公开(公告)号：US07247395B2
公开(公告)日：2007-07-24
申请号：US10319842
申请日：2002-12-16
申请人： Miyabi Nakamura , Takahiro Shimizu , Hiroyuki Uwazumi , Naoki Takizawa , Tadaaki Oikawa
发明人： Miyabi Nakamura , Takahiro Shimizu , Hiroyuki Uwazumi , Naoki Takizawa , Tadaaki Oikawa
IPC分类号： G11B5/66 , G11B5/70
CPC分类号： G11B5/7325 , G11B5/65
摘要： A magnetic recording medium exhibiting low noise and having a sufficiently high coercive force includes a magnetic layer having a granular structure including ferromagnetic crystal grains with a hexagonal closed packed structure and a nonmagnetic grain boundary region of mainly an oxide intervening between the crystal grains. An underlayer has a body-centered cubic lattice structure. A nonmagnetic intermediate layer with the hexagonal closest packed structure includes Ru, Os, and/or Re, which are provided between the magnetic layer and the underlayer. A degree of mismatching Δ=|d1−d2|/d1 is at most 10%, for instance, in a range from 2.5% to 7.0%, where d1 is a spacing of lattice planes of the crystal grains in the magnetic layer and d2 is a spacing of the lattice planes of the crystal grains in the intermediate layer. A proportion of the crystal grains with a grain size of equal or greater than 8 nm are at most 10% of the crystal grains included in the intermediate layer and a standard deviation of the grain size is at most 1.4 nm. The layers are deposited without preheating the substrate.
摘要翻译：表现出低噪声并且具有足够高的矫顽力的磁记录介质包括具有包括具有六方密闭堆积结构的铁磁晶粒和主要是介于晶粒之间的氧化物的非磁性晶界区域的颗粒结构的磁性层。底层具有体心立方晶格结构。具有六方最密堆积结构的非磁性中间层包括设置在磁性层和底层之间的Ru，Os和/或Re。 Δ不一致的程度达到= 10％以下，例如在 2.5％至7.0％，其中d 1是磁性层中晶粒的晶格间距，d 2是晶体的晶格面间距中间层的晶粒。晶粒尺寸等于或大于8nm的晶粒的比例至多为包含在中间层中的晶粒的10％，并且晶粒尺寸的标准偏差为至多1.4nm。在不预热基底的情况下沉积这些层。

9. 发明申请

US20050196642A1 Magnetic recording medium and method for manufacturing the same 有权
公开(公告)号：US20050196642A1
公开(公告)日：2005-09-08
申请号：US11114578
申请日：2005-04-26
申请人： Miyabi Nakamura , Takahiro Shimizu , Hiroyuki Uwazumi , Naoki Takizawa , Tadaaki Oikawa
发明人： Miyabi Nakamura , Takahiro Shimizu , Hiroyuki Uwazumi , Naoki Takizawa , Tadaaki Oikawa
IPC分类号： C23C14/14 , C23C14/34 , G11B5/64 , G11B5/65 , G11B5/712 , G11B5/73 , G11B5/738 , G11B5/851 , H01F10/16 , H01F10/28 , B32B5/16
CPC分类号： G11B5/656 , G11B5/712 , G11B5/851 , Y10S428/90 , Y10T428/12465
摘要： A magnetic recording medium, and method of manufacturing the same, is provided with excellent recording performance by employing a granular magnetic layer having a specified composition. A magnetic recording medium according to the present invention comprises a nonmagnetic underlayer, a granular magnetic layer, a protective film, and a liquid lubrication layer sequentially laminated on a nonmagnetic substrate. The granular magnetic layer consists of ferromagnetic crystal grains containing cobalt and nonmagnetic grain boundary region surrounding the ferromagnetic crystal grains. The ferromagnetic crystal grains contain platinum in the range of 15 at % to 17 at %.

10. 发明授权

US06899964B2 Magnetic recording medium and method for manufacturing the same 有权
标题翻译：磁记录介质及其制造方法
公开(公告)号：US06899964B2
公开(公告)日：2005-05-31
申请号：US10317017
申请日：2002-12-11
申请人： Miyabi Nakamura , Takahiro Shimizu , Hiroyuki Uwazumi , Naoki Takizawa , Tadaaki Oikawa
发明人： Miyabi Nakamura , Takahiro Shimizu , Hiroyuki Uwazumi , Naoki Takizawa , Tadaaki Oikawa
IPC分类号： C23C14/14 , C23C14/34 , G11B5/64 , G11B5/65 , G11B5/712 , G11B5/73 , G11B5/738 , G11B5/851 , H01F10/16 , H01F10/28 , G11B5/66 , G11B5/70 , H01J1/00
CPC分类号： G11B5/656 , G11B5/712 , G11B5/851 , Y10S428/90 , Y10T428/12465
摘要： A magnetic recording medium, and method of manufacturing the same, is provided with excellent recording performance by employing a granular magnetic layer having a specified composition. A magnetic recording medium according to the present invention comprises a nonmagnetic underlayer, a granular magnetic layer, a protective film, and a liquid lubrication layer sequentially laminated on a nonmagnetic substrate. The granular magnetic layer consists of ferromagnetic crystal grains containing cobalt and nonmagnetic grain boundary region surrounding the ferromagnetic crystal grains. The ferromagnetic crystal grains contain platinum in the range of 15 at % to 17 at %.
摘要翻译：磁记录介质及其制造方法通过采用具有特定组成的粒状磁性层而具有良好的记录性能。根据本发明的磁记录介质包括顺序层压在非磁性基底上的非磁性底层，粒状磁性层，保护膜和液体润滑层。颗粒状磁性层由铁磁性晶粒构成，包含铁磁性晶粒周围的钴和非磁性晶界。铁磁晶粒含有15原子％至17原子％的铂。

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