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1. 发明授权

US07556871B2 Magnetic recording medium containing first and second recording layers, each layer containing a columnar structure 有权
标题翻译：含有第一和第二记录层的磁记录介质，每层包含柱状结构
公开(公告)号：US07556871B2
公开(公告)日：2009-07-07
申请号：US11105045
申请日：2005-04-12
申请人： Takayuki Ichihara , Atsushi Nakamura , Ichiro Tamai , Yuzuru Hosoe
发明人： Takayuki Ichihara , Atsushi Nakamura , Ichiro Tamai , Yuzuru Hosoe
IPC分类号： G11B5/66
CPC分类号： G11B5/667 , G11B5/66 , G11B5/7325
摘要： Embodiments of the invention provide a perpendicular magnetic recording medium capable of reconciling a high recording density with high thermal stability, and having a high write-ability while maintaining high magnetic anisotropy energy. In one embodiment, a perpendicular magnetic recording medium has a soft-magnetic underlayer, and magnetic recording layers, and the magnetic recording layers comprises a first recording layer containing magnetic grains oriented in a direction normal to a medium plane, and a second recording layer containing magnetic grains tilted in a cross-track direction. There can be provided a perpendicular magnetic recording medium resistant to thermal fluctuation, small in medium noise, and excellent in write-ability.
摘要翻译：本发明的实施方案提供了一种垂直磁记录介质，其能够调和高记录密度和高热稳定性，并且具有高的写入能力，同时保持高的磁各向异性能量。在一个实施例中，垂直磁记录介质具有软磁性底层和磁记录层，并且磁记录层包括含有沿垂直于介质平面的方向取向的磁性颗粒的第一记录层和含有磁性晶粒沿横向方向倾斜。可以提供耐热波动，中等噪声小，写入性优异的垂直磁记录介质。

2. 发明申请

US20050227120A1 Magnetic recording medium and magnetic recording apparatus 有权
标题翻译：磁记录介质和磁记录装置
公开(公告)号：US20050227120A1
公开(公告)日：2005-10-13
申请号：US11105045
申请日：2005-04-12
申请人： Takayuki Ichihara , Atsushi Nakamura , Ichiro Tamai , Yuzuru Hosoe
发明人： Takayuki Ichihara , Atsushi Nakamura , Ichiro Tamai , Yuzuru Hosoe
IPC分类号： G11B5/64 , G11B5/65 , G11B5/66 , G11B5/667 , G11B5/73 , G11B5/738 , H01F10/16 , H01F10/30
CPC分类号： G11B5/667 , G11B5/66 , G11B5/7325
摘要： Embodiments of the invention provide a perpendicular magnetic recording medium capable of reconciling a high recording density with high thermal stability, and having a high write-ability while maintaining high magnetic anisotropy energy. In one embodiment, a perpendicular magnetic recording medium has a soft-magnetic underlayer, and magnetic recording layers, and the magnetic recording layers comprises a first recording layer containing magnetic grains oriented in a direction normal to a medium plane, and a second recording layer containing magnetic grains tilted in a cross-track direction. There can be provided a perpendicular magnetic recording medium resistant to thermal fluctuation, small in medium noise, and excellent in write-ability.
摘要翻译：本发明的实施方案提供了一种垂直磁记录介质，其能够调和高记录密度和高热稳定性，并且具有高的写入能力，同时保持高的磁各向异性能量。在一个实施例中，垂直磁记录介质具有软磁性底层和磁记录层，并且磁记录层包括含有沿垂直于介质平面的方向取向的磁性颗粒的第一记录层和含有磁性晶粒沿横向方向倾斜。可以提供耐热波动，中等噪声小，写入性优异的垂直磁记录介质。

3. 发明授权

US06924048B2 Magnetic recording medium and a magnetic storage apparatus 失效
标题翻译：磁记录介质和磁存储装置
公开(公告)号：US06924048B2
公开(公告)日：2005-08-02
申请号：US10413481
申请日：2003-04-15
申请人： Tetsuya Kanbe , Yuzuru Hosoe , Ichiro Tamai , Yoshio Takahashi , Kiwamu Tanahashi , Satoshi Matsunuma , Yoshihiro Shiroishi
发明人： Tetsuya Kanbe , Yuzuru Hosoe , Ichiro Tamai , Yoshio Takahashi , Kiwamu Tanahashi , Satoshi Matsunuma , Yoshihiro Shiroishi
IPC分类号： G11B5/66 , G11B5/39 , G11B5/64 , G11B5/65 , G11B5/70 , G11B5/714 , G11B5/738
CPC分类号： G11B5/70 , G11B5/714 , Y10S428/90
摘要： A magnetic storage device has a magnetic layer, the magnetic crystal grains of which are separated by a nonmagnetic phase. The typical crystal grain is in the approximate shape of a sphere or an ellipsoid. The thickness of the magnetic crystal grains, which is in the direction perpendicular to the surface or the film, is smaller than that of the thickness of the magnetic film. The ratio of the coercive force, which is measured in the circumferential direction, to the coercive force, which is measured in the radial direction, (the orientation ratio of the coercive force), is larger than 1.0, but preferably nor greater than 3.0. Further, the area fraction of the magnetic grains having an extended axis within 30° from the circumferential direction is equal to or more than 45%.
摘要翻译：磁存储装置具有磁性层，其磁性晶粒由非磁性相分离。典型的晶粒呈球体或椭圆体的近似形状。磁性晶粒的与表面或膜垂直的方向的厚度小于磁性膜的厚度。在圆周方向上测量的矫顽力与径向测定的矫顽力（矫顽力的取向比）的比例大于1.0，优选为3.0以下。此外，具有从圆周方向的30°以内的延伸轴的磁性颗粒的面积分数等于或大于45％。

4. 发明授权

US06605374B2 Magnetic recording medium and magnetic recording system using such a magnetic recording medium 失效
公开(公告)号：US06605374B2
公开(公告)日：2003-08-12
申请号：US10137398
申请日：2002-05-03
申请人： Tetsuya Kanbe , Yoshio Takahashi , Akira Ishikawa , Ichiro Tamai , Yuzuru Hosoe , Yoshifumi Matsuda , Kiwamu Tanahashi , Tomoo Yamamoto
发明人： Tetsuya Kanbe , Yoshio Takahashi , Akira Ishikawa , Ichiro Tamai , Yuzuru Hosoe , Yoshifumi Matsuda , Kiwamu Tanahashi , Tomoo Yamamoto
IPC分类号： G11B566
CPC分类号： G11B5/65 , G11B5/64 , G11B5/653 , Y10S428/90 , Y10T428/12465 , Y10T428/12854 , Y10T428/26 , Y10T428/265
摘要： The present invention provides a magnetic recording medium having a magnetic layer deposited on a substrate through a single-layer underlayer or a multilayer-underlayer, the magnetic layer includes magnetic crystal grains having an acicular structure or amorphous magnetic particles, an average grain size of the magnetic grain and a grain-size dispersion normalized by the average grain size are less than 16 nm and less than 0.5, respectively, a value Ku·v/kT which results from dividing a product of a magnetic anisotropy constant Ku and a volume v of the magnetic grain by a product of a Boltzmann constant k and an absolute temperature T is selected to be greater than 60, and a film thickness of the magnetic layer falls within twice of the average grain size. Thus, there can be realized a magnetic recording system in which a media noise can be reduced, a high S/N and a low bit error rate can be obtained and which has a high recording density of 2 gigabits per one square inches and an MTBF (mean time between failure) of higher than 300000 hours.

5. 发明授权

US06569545B1 Magnetic recording medium and a magnetic storage apparatus 失效
标题翻译：磁记录介质和磁存储装置
公开(公告)号：US06569545B1
公开(公告)日：2003-05-27
申请号：US09343721
申请日：1999-06-30
申请人： Tetsuya Kanbe , Yuzuru Hosoe , Ichiro Tamai , Yoshio Takahashi , Kiwamu Tanahashi , Satoshi Matsunuma , Yoshihiro Shiroishi
发明人： Tetsuya Kanbe , Yuzuru Hosoe , Ichiro Tamai , Yoshio Takahashi , Kiwamu Tanahashi , Satoshi Matsunuma , Yoshihiro Shiroishi
IPC分类号： G11B566
CPC分类号： G11B5/70 , G11B5/714 , Y10S428/90
摘要： A magnetic storage device has a recording density of over 5 gigabits per square inch. In the magnetic layer, the magnetic crystal grains of the granular structure are separated by a nonmagnetic phase. The typical crystal grain is in the approximate shape of a sphere or an ellipsoid. The thickness of the magnetic crystal grains, which is in the direction perpendicular to the surface of the film, is smaller than that of the thickness of the magnetic film. The ratio of the coercive force which is measured in the circumferential direction to the coercive force which is measured in the radial direction, which is the orientation ratio of the coercive force, is larger than 1.0, but preferably not greater than 3.0. Further, the area fraction of the magnetic grains having an extended axis within 30° from the circumferential direction is equal to or more than 45%.
摘要翻译：磁存储装置具有超过5千兆比特每平方英寸的记录密度。在磁性层中，粒状结构的磁性晶粒被非磁性相分离。典型的晶粒呈球体或椭圆体的近似形状。在与膜表面垂直的方向上的磁性晶粒的厚度小于磁性膜的厚度。在圆周方向上测量的矫顽力与作为矫顽力的取向比的径向测定的矫顽力的比例大于1.0，优选为3.0以下。此外，具有从圆周方向的30°以内的延伸轴的磁性颗粒的面积分数等于或大于45％。

6. 发明授权

US06403242B1 Magnetic recording medium and magnetic recording system using such a magnetic recording medium 有权
公开(公告)号：US06403242B1
公开(公告)日：2002-06-11
申请号：US09524914
申请日：2000-03-14
申请人： Tetsuya Kanbe , Yoshio Takahashi , Akira Ishikawa , Ichiro Tamai , Yuzuru Hosoe , Yoshifumi Matsuda , Kiwamu Tanahashi , Tomoo Yamamoto
发明人： Tetsuya Kanbe , Yoshio Takahashi , Akira Ishikawa , Ichiro Tamai , Yuzuru Hosoe , Yoshifumi Matsuda , Kiwamu Tanahashi , Tomoo Yamamoto
IPC分类号： G11B566
CPC分类号： G11B5/65 , G11B5/64 , G11B5/653 , Y10S428/90 , Y10T428/12465 , Y10T428/12854 , Y10T428/26 , Y10T428/265
摘要： The present invention provides a magnetic recording medium having a magnetic layer deposited on a substrate through a single-layer underlayer or a multilayer-underlayer, the magnetic layer includes magnetic crystal grains having an acicular structure or amorphous magnetic particles, an average grain size of the magnetic grain and a grain-size dispersion normalized by the average grain size are less than 16 nm and less than 0.5, respectively, a value Ku·v/kT which results from dividing a product of a magnetic anisotropy constant Ku and a volume v of the magnetic grain by a product of a Boltzmann constant k and an absolute temperature T is selected to be greater than 60, and a film thickness of the magnetic layer falls within twice of the average grain size. Thus, there can be realized a magnetic recording system in which a media noise can be reduced, a high S/N and a low bit error rate can be obtained and which has a high recording density of 2 gigabits per one square inches and an MTBF (mean time between failure) of higher than 300000 hours.

7. 发明授权

US5922456A Longitudal magnetic recording medium having a multi-layered underlayer and magnetic storage apparatus using such magnetic recording medium 失效
标题翻译：具有多层底层的纵向磁记录介质和使用这种磁记录介质的磁存储装置
公开(公告)号：US5922456A
公开(公告)日：1999-07-13
申请号：US922277
申请日：1997-09-03
申请人： Kiwamu Tanahashi , Yuzuru Hosoe , Ichiro Tamai , Tetsuya Kanbe , Tomoo Yamamoto
发明人： Kiwamu Tanahashi , Yuzuru Hosoe , Ichiro Tamai , Tetsuya Kanbe , Tomoo Yamamoto
IPC分类号： G11B5/66 , G11B5/012 , G11B5/39 , G11B5/64 , G11B5/667 , G11B5/73 , G11B5/738
CPC分类号： B82Y25/00 , B82Y10/00 , G11B5/012 , G11B5/3903 , G11B5/3967 , G11B5/7325 , G11B2005/3996 , Y10S428/90 , Y10T428/26 , Y10T428/265
摘要： A longitudinal magnetic recording medium and a magnetic storage apparatus using the longitudinal magnetic recording medium. The recording medium has a multi-layered underlayer and a magnetic layer formed on it. The underlayer has a first layer of a body-centered cubic structure, a second layer of a hexagonal-close packed structure formed on the first layer, and a third layer of a bcc structure formed on the second layer. The underlayer may further have a fourth layer of an hcp structure layer formed on the third layer.
摘要翻译：纵向磁记录介质和使用纵向磁记录介质的磁存储装置。记录介质具有形成在其上的多层底层和磁性层。底层具有体心立方结构的第一层，形成在第一层上的六方密堆积结构的第二层和形成在第二层上的bcc结构的第三层。底层可以进一步具有形成在第三层上的第四层hcp结构层。

8. 发明授权

US07056604B2 Magnetic recording media and magnetic recording system using the same 失效
公开(公告)号：US07056604B2
公开(公告)日：2006-06-06
申请号：US10452723
申请日：2003-06-03
申请人： Tetsuya Kanbe , Akira Ishikawa , Ichiro Tamai , Yotsuo Yahisa , Yuzuru Hosoe , Kiwamu Tanahashi , Yoshibumi Matsuda , Hiroyuki Kataoka , Toshinori Ono , Shinji Fukaya , Kazuhiro Ura , Naoto Endo , Tomoo Yamamoto
发明人： Tetsuya Kanbe , Akira Ishikawa , Ichiro Tamai , Yotsuo Yahisa , Yuzuru Hosoe , Kiwamu Tanahashi , Yoshibumi Matsuda , Hiroyuki Kataoka , Toshinori Ono , Shinji Fukaya , Kazuhiro Ura , Naoto Endo , Tomoo Yamamoto
IPC分类号： G11B5/66 , G11B5/70
CPC分类号： G11B5/7325 , G11B5/012 , G11B5/39 , G11B5/66 , Y10S428/90 , Y10T428/12465 , Y10T428/12847 , Y10T428/12854 , Y10T428/26
摘要： A magnetic recording system includes an in-plane magnetic recording medium having a magnetic layer fabricated on a single underlayer or on a plurality of underlayers respectively fabricated on a substrate; a driver unit for driving the in-plane magnetic recording medium in a write direction; a magnetic head having a read unit and a write unit; a unit for moving the magnetic head relative to the in-plane magnetic recording medium; and a read/write signal processing unit for reading an output signal from the magnetic head and writing an input signal to the magnetic recording media, wherein the read unit of the magnetic head is a magnetoresistive head and the single underlayer or at least one of the plurality of underlayers is made of Co-containing amorphous material or fine crystal material, or is made of alloy material, the alloy material having as the main components at least one element selected from a group consisting of Cr, Mo, V and Ta and containing at least one element selected from a group consisting of B, C, P and Bi. The magnetic recording system can be realized which can read and write high density information and have high reliability.

9. 发明授权

US06574060B2 Magnetic storage apparatus 失效
标题翻译：磁存储装置
公开(公告)号：US06574060B2
公开(公告)日：2003-06-03
申请号：US09799073
申请日：2001-03-06
申请人： Tetsuya Kanbe , Ichiro Tamai , Yuzuru Hosoe , Kiwamu Tanahashi , Yoshio Takahashi , Fumiyoshi Kirino , Nagatugu Koiso , Satoshi Matsunuma
发明人： Tetsuya Kanbe , Ichiro Tamai , Yuzuru Hosoe , Kiwamu Tanahashi , Yoshio Takahashi , Fumiyoshi Kirino , Nagatugu Koiso , Satoshi Matsunuma
IPC分类号： G11B502
CPC分类号： G11B5/7325 , C23C14/185 , G11B5/00 , G11B5/012 , G11B2005/001 , G11B2005/0016 , Y10S428/90 , Y10S428/928 , Y10T428/1107 , Y10T428/1121 , Y10T428/12507 , Y10T428/1266 , Y10T428/12667 , Y10T428/12674 , Y10T428/12819 , Y10T428/12826 , Y10T428/12868 , Y10T428/12944 , Y10T428/265
摘要： In a magnetic storage apparatus having a magnetic recording medium, a drive unit for driving this medium in a prespecified recording direction, a magnetic head assembly including a recorder section and reproduction section, a way to cause the magnetic head to move relatively with respect to the magnetic record medium, and a record/playback signal processor for performing signal inputting to the magnetic head and for effecting reproduction of an output signal from the magnetic head, the reproduction section of said magnetic head is composed of a magnetic head of the magnetoresistance effect type, while said magnetic record medium is structured including a substrate and a magnetic layer formed thereover with one or several underlayers being sandwiched therebetween, wherein at least one of hte underlayers is a specific layer that is made of amorphous or microcrystalline materials containing therein Ni as the principal or main component thereof and further containing at least one kind of element as selected from the group consisting of Nb and Ta.
摘要翻译：在具有磁记录介质的磁存储装置中，用于以预先指定的记录方向驱动该介质的驱动单元，包括记录器部分和再现部分的磁头组件，使磁头相对于磁记录介质和记录/重放信号处理器，用于对磁头进行信号输入并用于实现来自磁头的输出信号的再现，所述磁头的再现部分由磁阻效应型磁头而所述磁记录介质被构造成包括衬底和形成在其上的一个或多个底层之间的磁性层，其中至少一个底层是由非晶或微晶材料制成的特定层，其中含有Ni作为其主要成分或主要成分，还含有至少一种e 选自Nb和Ta组成的组。

10. 发明授权

US07651795B2 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：US07651795B2
公开(公告)日：2010-01-26
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： G11B5/65
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。

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