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1. 发明授权

US08000060B2 Perpendicular magnetic recording medium and system having a magnetic recording layer with a perpendicular recording layer, a magnetic coupling layer, and a writing assist layer 有权
标题翻译：垂直磁记录介质和具有垂直记录层的磁记录层，磁耦合层和书写辅助层的系统
公开(公告)号：US08000060B2
公开(公告)日：2011-08-16
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
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 a substrate, a magnetic recording layer and a protective layer. The magnetic recording layer includes a perpendicular recording layer, a magnetic coupling layer and a writing assist layer. The perpendicular recording layer is a Co alloy layer containing an oxide disposed between the magnetic coupling layer and the substrate. The magnetic coupling layer is a ferromagnetic layer disposed between the perpendicular recording layer and the writing assist layer. The writing assist layer is a ferromagnetic layer disposed between the magnetic coupling layer and the protective layer. The saturation magnetization of the magnetic coupling layer is lower than the saturation magnetization of the perpendicular recording layer or the writing assist layer. The thickness of the magnetic coupling layer is 1 nm or more and 3 nm or less.
摘要翻译：本发明的实施例提供一种具有基板，磁记录层和保护层的垂直磁记录介质。磁记录层包括垂直记录层，磁耦合层和书写辅助层。垂直记录层是包含设置在磁耦合层和基板之间的氧化物的Co合金层。磁耦合层是设置在垂直记录层和书写辅助层之间的铁磁层。写辅助层是设置在磁耦合层和保护层之间的铁磁层。磁耦合层的饱和磁化强度低于垂直记录层或书写辅助层的饱和磁化强度。磁耦合层的厚度为1nm以上3nm以下。

2. 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。

3. 发明申请

US20090073599A1 Perpendicular magnetic recording medium and magnetic recording and reproducing apparatus using the same 审中-公开
标题翻译：垂直磁记录介质和使用其的磁记录和再现设备
公开(公告)号：US20090073599A1
公开(公告)日：2009-03-19
申请号：US12231513
申请日：2008-09-02
申请人： Hiroaki Nemoto , Ikuko Takekuma , Zhengang Zhang
发明人： Hiroaki Nemoto , Ikuko Takekuma , Zhengang Zhang
IPC分类号： G11B5/596 , G11B5/62
CPC分类号： G11B5/66 , G11B5/65 , G11B5/82
摘要： Embodiments of the present invention provide a perpendicular magnetic recording medium suitable for high density recording. According to one embodiment, a magnetic recording layer comprises four layers in which a first magnetic layer, a magnetic coupling layer, a second magnetic layer, and a third magnetic layer are formed above a substrate. The first magnetic layer and the second magnetic layer are perpendicular magnetization films containing an oxide, and ferromagnetically coupled with each other by way of the magnetic coupling layer, and they are, more preferably, a Co alloy layer containing an oxide. The third magnetic layer is ferromagnetically coupled with the second magnetic layer. The concentration of the oxide contained in the third magnetic layer is lower than the concentration of the oxide in the second recording layer, or the third magnetic layer does not contain the oxide. In this case, magnetic property is set for the anisotropic magnetic field Hk1 of the first magnetic layer and the anisotropic magnetic field Hk2 of the second magnetic layer, so as to satisfy: Hk1>Hk2.
摘要翻译：本发明的实施例提供适用于高密度记录的垂直磁记录介质。根据一个实施例，磁记录层包括四个层，其中在衬底上形成第一磁性层，磁耦合层，第二磁性层和第三磁性层。第一磁性层和第二磁性层是含有氧化物的垂直磁化膜，并且通过磁耦合层铁磁耦合，更优选是含有氧化物的Co合金层。第三磁性层与第二磁性层铁磁耦合。包含在第三磁性层中的氧化物的浓度低于第二记录层中的氧化物的浓度，或者第三磁性层不含氧化物。在这种情况下，对于第一磁性层的各向异性磁场Hk1和第二磁性层的各向异性磁场Hk2设定磁特性，以满足：Hk1> Hk2。

4. 发明授权

US08709618B2 Magnetic storage apparatus 有权
标题翻译：磁存储装置
公开(公告)号：US08709618B2
公开(公告)日：2014-04-29
申请号：US11726099
申请日：2007-03-20
申请人： Ikuko Takekuma , Hiroyuki Nakagawa , Hiroaki Nemoto , Yoshiyuki Hirayama
发明人： Ikuko Takekuma , Hiroyuki Nakagawa , Hiroaki Nemoto , Yoshiyuki Hirayama
IPC分类号： G11B5/66
CPC分类号： G11B5/66 , G11B5/11 , G11B5/1278 , G11B5/3116 , G11B5/3146 , G11B5/315 , G11B5/3967 , G11B5/656
摘要： According to embodiments of the present invention, a shielded pole writer and a perpendicular magnetic recording medium suitable thereto are combined to provide high medium SNR and excellent OW characteristic simultaneously. A perpendicular magnetic recording medium of a magnetic storage apparatus mounting a shielded pole writer, including a perpendicular magnetic recording medium having a recording layer of a three layered structure is used. A first recording layer has a granular structure consisting of grain boundaries containing an oxide and columnar grains comprising a CoCrPt alloy, in which a second recording layer and a third recording layer formed thereabove comprise Co as a main ingredient, contain Cr and do not contain an oxide, and the Cr concentration in the second recording layer is lower than the Cr concentration in the third recording layer.
摘要翻译：根据本发明的实施例，组合屏蔽极写入器和适合于其的垂直磁记录介质，以同时提供高中等信噪比和优异的OW特性。使用安装屏蔽极写入器的磁存储装置的垂直磁记录介质，其包括具有三层结构的记录层的垂直磁记录介质。第一记录层具有由包含氧化物的晶界和包含CoCrPt合金的柱状晶粒构成的粒状结构，其中形成在其上的第二记录层和第三记录层包含Co作为主要成分，并且不含有并且第二记录层中的Cr浓度低于第三记录层中的Cr浓度。

5. 发明授权

US07701667B2 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：US07701667B2
公开(公告)日：2010-04-20
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： G11B5/66
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Ms1（emu /立方厘米）时，第二记录层的饱和磁化强度设定为Ms2（emu /立方厘米），第一记录层膜厚设定为t1（nm）那么（Ms2-Ms1）×t1将大于0（每平方厘米的记忆），小于0.15（每平方厘米的记忆）。

6. 发明授权

US07368185B2 Perpendicular magnetic recording media 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：US07368185B2
公开(公告)日：2008-05-06
申请号：US10977552
申请日：2004-10-29
申请人： Yoshiyuki Hirayama , Yuzuru Hosoe , Hiroyuki Nakagawa , Ikuko Takekuma
发明人： Yoshiyuki Hirayama , Yuzuru Hosoe , Hiroyuki Nakagawa , Ikuko Takekuma
IPC分类号： G11B5/66 , G11B5/70
CPC分类号： G11B5/7325 , G11B5/65 , G11B5/656
摘要： Embodiments of the invention provide a perpendicular magnetic recording medium that not only attains the magnetic isolation of crystal grains in a magnetic recording layer from one another in a region of the medium in which the thickness of an intermediate layer is equal to or smaller than about 20 nm but also exhibits excellent crystallographic texture and that exhibits small medium noise, excellent thermal stability, and high write-ability. In one embodiment, a perpendicular magnetic recording medium has at least a soft-magnetic underlayer, a first intermediate layer, a second intermediate layer, a third intermediate layer, and a magnetic recording layer successively formed on a substrate. The magnetic recording layer is composed of ferromagnetic crystal grains and oxides or nitrides, the third intermediate layer is composed of Ru or an Ru alloy, the second intermediate layer is composed of a metal or an alloy having the face-centered cubic lattice structure, and the first intermediate layer is composed of a metal or an alloy having the hexagonal close-packed structure.
摘要翻译：本发明的实施例提供了一种垂直磁记录介质，其不仅在中间层的厚度等于或小于约20的介质的区域中彼此之间实现磁记录层中的晶粒的磁隔离 nm，但也具有优异的晶体学结构，表现出中等的中等噪声，优异的热稳定性和高的写入能力。在一个实施例中，垂直磁记录介质至少具有在基板上依次形成的软磁性底层，第一中间层，第二中间层，第三中间层和磁记录层。磁记录层由铁磁性晶粒和氧化物或氮化物构成，第三中间层由Ru或Ru合金构成，第二中间层由具有面心立方晶格结构的金属或合金构成，第一中间层由具有六方密堆积结构的金属或合金构成。

7. 发明申请

US20060076233A1 Magnetic recording medium and method for production thereof 审中-公开
标题翻译：磁记录介质及其制造方法
公开(公告)号：US20060076233A1
公开(公告)日：2006-04-13
申请号：US11246344
申请日：2005-10-06
申请人： Yoshinori Honda , Ikuko Takekuma , Ichiro Tamai
发明人： Yoshinori Honda , Ikuko Takekuma , Ichiro Tamai
IPC分类号： C23C14/00
CPC分类号： G11B5/851 , C23C14/0057 , C23C14/568 , G11B5/667
摘要： A reactive sputtering method is provided for producing a magnetic layer in a stable manner with good reproducibility. One aspect of the invention is to form a magnetic layer for a magnetic recording medium without adversely affecting magnetic properties. Carbon oxide gas is added at the time of reactive sputtering. In one embodiment, a method for producing a magnetic recording medium includes forming at least a soft magnetic layer and a magnetic layer above a substrate, wherein forming said magnetic layer includes sputtering with argon gas and carbon oxide gas.
摘要翻译：提供了以良好的再现性稳定地制造磁性层的反应性溅射方法。本发明的一个方面是形成用于磁记录介质的磁性层，而不会不利地影响磁特性。在反应溅射时加入碳氧化物气体。在一个实施例中，制造磁记录介质的方法包括至少在基板上形成软磁性层和磁性层，其中形成所述磁性层包括用氩气和碳氧化物气体溅射。

8. 发明申请

US20050142388A1 Perpendicular magnetic recording media 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：US20050142388A1
公开(公告)日：2005-06-30
申请号：US10977552
申请日：2004-10-29
申请人： Yoshiyuki Hirayama , Yuzuru Hosoe , Hiroyuki Nakagawa , Ikuko Takekuma
发明人： Yoshiyuki Hirayama , Yuzuru Hosoe , Hiroyuki Nakagawa , Ikuko Takekuma
IPC分类号： G11B5/738 , G11B5/64 , G11B5/65 , G11B5/667 , G11B5/673 , G11B5/73 , G11B5/68
CPC分类号： G11B5/7325 , G11B5/65 , G11B5/656
摘要： Embodiments of the invention provide a perpendicular magnetic recording medium that not only attains the magnetic isolation of crystal grains in a magnetic recording layer from one another in a region of the medium in which the thickness of an intermediate layer is equal to or smaller than about 20 nm but also exhibits excellent crystallographic texture and that exhibits small medium noise, excellent thermal stability, and high write-ability. In one embodiment, a perpendicular magnetic recording medium has at least a soft-magnetic underlayer, a first intermediate layer, a second intermediate layer, a third intermediate layer, and a magnetic recording layer successively formed on a substrate. The magnetic recording layer is composed of ferromagnetic crystal grains and oxides or nitrides, the third intermediate layer is composed of Ru or an Ru alloy, the second intermediate layer is composed of a metal or an alloy having the face-centered cubic lattice structure, and the first intermediate layer is composed of a metal or an alloy having the hexagonal close-packed structure.
摘要翻译：本发明的实施例提供了一种垂直磁记录介质，其不仅在中间层的厚度等于或小于约20的介质的区域中彼此之间实现磁记录层中的晶粒的磁隔离 nm，但也具有优异的晶体学结构，表现出中等的中等噪声，优异的热稳定性和高的写入能力。在一个实施例中，垂直磁记录介质至少具有在基板上依次形成的软磁性底层，第一中间层，第二中间层，第三中间层和磁记录层。磁记录层由铁磁性晶粒和氧化物或氮化物构成，第三中间层由Ru或Ru合金构成，第二中间层由具有面心立方晶格结构的金属或合金构成，第一中间层由具有六方密堆积结构的金属或合金构成。

9. 发明申请

US20120214021A1 MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING APPARATUS 审中-公开
标题翻译：磁记录介质和磁记录装置
公开(公告)号：US20120214021A1
公开(公告)日：2012-08-23
申请号：US13364682
申请日：2012-02-02
申请人： Junichi Sayama , Ikuko Takekuma , Hiroaki Nemoto
发明人： Junichi Sayama , Ikuko Takekuma , Hiroaki Nemoto
IPC分类号： G11B5/65
CPC分类号： G11B5/65 , G11B5/7325
摘要： There is provided a magnetic recording medium including an MgO underlayer that can be formed by a mass production process and has a thickness of 3 nm or less as well as including a magnetic recording layer made of an L10-type FePt ordered alloy having excellent magnetic properties. A conductive compound having a crystal structure belonging to a cubic system is used as a material of an underlayer provided at the bottom of the MgO underlayer. The thickness of the MgO layer is 1 nm or more and 3 nm or less.
摘要翻译：提供了一种包括MgO底层的磁记录介质，其可以通过批量生产工艺形成并具有3nm或更小的厚度，并且包括由具有优异磁性的L10型FePt有序合金制成的磁记录层。使用具有属于立方体系的晶体结构的导电化合物作为设置在MgO底层底部的底层的材料。 MgO层的厚度为1nm以上3nm以下。

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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