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21. 发明授权

US07457064B2 Perpendicular magnetic recording medium, method of evaluating magnetic properties of the same 失效
标题翻译：垂直磁记录介质，磁性能评价方法
公开(公告)号：US07457064B2
公开(公告)日：2008-11-25
申请号：US11715132
申请日：2007-03-06
申请人： Hiroaki Nemoto , Ikuko Takekuma , Yuzuru Hosoe
发明人： Hiroaki Nemoto , Ikuko Takekuma , Yuzuru Hosoe
IPC分类号： G11B5/667
CPC分类号： G11B5/82 , G11B5/1278 , G11B5/65
摘要： Embodiments in accordance with the present invention provide a perpendicular magnetic recording medium which is easy to record, offers superior thermal stability of recording magnetization, and allows high-density recording. In one embodiment, a perpendicular magnetic layer with controlled magnetic properties is used as a magnetic storage layer of a perpendicular magnetic recording medium, the magnetic properties having been controlled such that an indicator σhsw [%] of the dispersion of magnetization switching fields in the perpendicular magnetic layer and an indicator Dn [nm] of the intensity of exchange interactions, in film surface directions, in the perpendicular magnetic layer satisfy inequalities σhsw/27+Dn/90 20. The indicators can be measured using a magnetometer.
摘要翻译：根据本发明的实施例提供了易于记录的垂直磁记录介质，提供了优异的记录磁化的热稳定性，并允许高密度记录。在一个实施例中，使用具有受控磁特性的垂直磁性层作为垂直磁记录介质的磁存储层，其磁特性已经被控制，使得该磁性能的指标σ< 垂直磁性层中的磁化开关场的分散和膜的表面方向上的交换相互作用强度的指示器D N n [nm]满足不等式sigmah < / SUB + / 27 + D / 90 <1和D 20。指标可以用磁力计测量。

22. 发明申请

US20070087226A1 Perpendicular magnetic recording medium with high medium S/N 有权
标题翻译：具有高介质S / N的垂直磁记录介质
公开(公告)号：US20070087226A1
公开(公告)日：2007-04-19
申请号：US11582878
申请日：2006-10-17
申请人： Hiroyuki Matsumoto , Mitsuhiro Shoda , Reiko Arai , Yuzuru Hosoe , Katsumi Mabuchi
发明人： Hiroyuki Matsumoto , Mitsuhiro Shoda , Reiko Arai , Yuzuru Hosoe , Katsumi Mabuchi
IPC分类号： G11B5/66
CPC分类号： G11B5/667
摘要： A medium having high medium S/N and excellent corrosion resistance is achieved. In one embodiment, an adhesion layer, a soft magnetic layer, an intermediate layer, a magnetic recording layer, and a protective layer are deposited, in order, on a substrate. The soft magnetic underlayer consists at least of two soft magnetic layers, the first soft magnetic layer formed on the recording layer side being composed of an amorphous alloy containing 85 at. % or less of Co, and the second soft magnetic layer formed on the substrate side being composed of an alloy containing more than 85 at. % of Co.
摘要翻译：实现了具有高介质S / N和优异耐腐蚀性的介质。在一个实施例中，依次将粘合层，软磁层，中间层，磁记录层和保护层沉积在基板上。软磁性底层至少由两个软磁性层构成，记录层侧形成的第一软磁性层由含有85μm的非晶态合金构成。 Co以下的合金，由基板侧形成的第二软磁性层由含有85个以上的合金构成。有限公司

23. 发明授权

US07182974B2 Magnetic recording medium and its manufacturing method and magnetic recording system using such a magnetic recording medium 失效
标题翻译：磁记录介质及其制造方法以及使用这种磁记录介质的磁记录系统
公开(公告)号：US07182974B2
公开(公告)日：2007-02-27
申请号：US10774371
申请日：2004-02-10
申请人： Yoshio Takahashi , Kiwamu Tanahashi , Yuzuru Hosoe , Ichiro Tamai
发明人： Yoshio Takahashi , Kiwamu Tanahashi , Yuzuru Hosoe , Ichiro Tamai
IPC分类号： B05D5/12
CPC分类号： G11B5/64 , G11B5/66 , G11B5/84 , Y10T428/12465 , Y10T428/12875 , Y10T428/31
摘要： A magnetic recording medium having a high coercive force and being capable of high-density writing/reading has a substrate, a soft magnetic layer, a non-magnetic intermediate layer, a magnetic layer, a protective layer, and a lubricating layer. The magnetic layer is characterized by stacking fault density and dispersion of particle diameters. The stacking fault density should preferably be no larger than 0.05, and the dispersion of particle diameters should preferably be no larger than 0.4. The magnetic recording medium has a coercive force larger than 4000 Oe, is highly stable to thermal decay, and has a recording density in excess of 50 Gbit/in2.
摘要翻译：具有高矫顽磁力并且能够进行高密度写入/读取的磁记录介质具有基板，软磁层，非磁性中间层，磁性层，保护层和润滑层。磁性层的特征在于堆垛层错密度和粒径分散。堆垛层错密度优选为0.05以下，粒径分布优选为0.4以下。磁记录介质具有大于4000Oe的矫顽力，对热衰减高度稳定，并且具有超过50Gbit / in 2的记录密度。

24. 发明申请

US20060088734A1 Perpendicular magnetic recording medium for high density magnetic recording and manufacturing of the same 有权
公开(公告)号：US20060088734A1
公开(公告)日：2006-04-27
申请号：US11243012
申请日：2005-10-03
申请人： Reiko Arai , Yoshiyuki Hirayama , Yuzuru Hosoe , Tomio Iwasaki , Yoko Ogawa , Ikuko Takekuma
发明人： Reiko Arai , Yoshiyuki Hirayama , Yuzuru Hosoe , Tomio Iwasaki , Yoko Ogawa , Ikuko Takekuma
IPC分类号： G11B5/66 , B05D5/12
CPC分类号： G11B5/732 , G11B5/656 , G11B5/851
摘要： Embodiments of the invention are directed to 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 includes 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 80 at. % Ru or more.

25. 发明申请

US20060088733A1 Perpendicular magnetic recording medium having grain boundary layer containing ferromagnetic element 有权
标题翻译：具有含有铁磁性元素的晶界层的垂直磁记录介质
公开(公告)号：US20060088733A1
公开(公告)日：2006-04-27
申请号：US11258642
申请日：2005-10-25
申请人： Yuzuru Hosoe , Atsushi Nakamura , Yoshio Takahashi
发明人： Yuzuru Hosoe , Atsushi Nakamura , Yoshio Takahashi
IPC分类号： G11B5/66
CPC分类号： G11B5/65
摘要： Embodiments of the invention ensure that a perpendicular magnetic recording medium having a granular magnetic recording layer made of CoCrPt alloy and Si oxide provides both high SNR and thermal stability. In one embodiment, a substantially amorphous grain boundary layer of a magnetic recording layer made of CoCrPt alloy and Si oxide contains a ferromagnetic element in a concentration from about 30 at. % to 50 at. % or more preferably from about 35 at. % to 47 at. %, so that intergrain exchange interaction takes place moderately. As a consequence, SNR of 18 dB or more and thermal stability of 3%/decade or less are achieved.
摘要翻译：本发明的实施例确保具有由CoCrPt合金和Si氧化物制成的粒状磁记录层的垂直磁记录介质提供高SNR和热稳定性。在一个实施例中，由CoCrPt合金和Si氧化物制成的磁记录层的基本无定形晶界层含有浓度为约30英寸的铁磁性元素。％至50 at。％或更优选约35at。％至47在。％，这样就能适度地进行格局互动交流。因此，实现了18dB以上的SNR和3％/ 10以下的热稳定性。

26. 发明申请

US20050042367A1 Perpendicular magnetic recording medium and process of production thereof 审中-公开
标题翻译：垂直磁记录介质及其生产工艺
公开(公告)号：US20050042367A1
公开(公告)日：2005-02-24
申请号：US10952735
申请日：2004-09-30
申请人： Hiroaki Nemoto , Hiroyuki Nakagawa , Yuzuru Hosoe
发明人： Hiroaki Nemoto , Hiroyuki Nakagawa , Yuzuru Hosoe
IPC分类号： G11B5/00 , G11B5/64 , G11B5/66 , G11B5/673 , G11B5/738 , G11B5/84 , H01F10/16 , H01F41/32 , B05D3/00
CPC分类号： G11B5/84 , G11B5/656 , G11B5/66 , G11B2005/0029 , Y10T428/12646 , Y10T428/12875 , Y10T428/12931 , Y10T428/24975 , Y10T428/265
摘要： A perpendicular magnetic recording medium, which has a low level of recording noise and sufficiently large perpendicular magnetic anisotropy energy relative to demagnetizing field energy, includes a substrate and a multi-layered magnetic film. The multi-layered magnetic film is composed of ferromagnetic metal layers of Co alloy containing at least Cr and non-magnetic metal layers of Pd alloy, each one layer of which are laminated alternately on top of one layer of the other. The ferromagnetic metal layers and the non-magnetic metal layers have a thickness of d1 and d2, respectively, with the ratio of d1/d2 being in the range of 1.5 to 4.0. This specific layer structure reduces the magnetic exchange interaction between magnetic particles in the multi-layered magnetic film. Therefore, the perpendicular magnetic recording medium is stable against thermal disturbance and has a low level of recording noise.
摘要翻译：相对于去磁场能量，具有低水平的记录噪声和足够大的垂直磁各向异性能的垂直磁记录介质包括基底和多层磁性膜。多层磁性膜由至少含有Cr的Co合金的铁磁性金属层和Pd合金的非磁性金属层构成，其中的每一层交替层叠在另一层之上。强磁性金属层和非磁性金属层的厚度分别为d1和d2，d1 / d2的比例在1.5至4.0的范围内。该特定的层结构减少了多层磁性膜中磁性颗粒之间的磁交换相互作用。因此，垂直磁记录介质对于热干扰是稳定的并且具有低水平的记录噪声。

27. 发明授权

US06846577B2 Magnetic recording medium possessing a fluctuation field of not less than 30 Oe 失效
标题翻译：磁记录介质具有不小于30 Oe的波动场
公开(公告)号：US06846577B2
公开(公告)日：2005-01-25
申请号：US10386456
申请日：2003-03-13
申请人： Kazusuke Yamanaka , Tomoo Yamamoto , Yuzuru Hosoe , Nobuyuki Inaba , Yasutaro Uesaka , Masaaki Futamoto , Yoshibumi Matsuda , Kenji Furusawa , Shinji Narishige
发明人： Kazusuke Yamanaka , Tomoo Yamamoto , Yuzuru Hosoe , Nobuyuki Inaba , Yasutaro Uesaka , Masaaki Futamoto , Yoshibumi Matsuda , Kenji Furusawa , Shinji Narishige
IPC分类号： G11B5/66 , G11B5/02 , G11B5/64 , G11B5/65 , G11B5/73
CPC分类号： G11B5/64 , Y10T428/12465 , Y10T428/12986 , Y10T428/265 , Y10T428/31
摘要： An ferromagnetic thin film is used to provide a magnetic recording medium whose noise is low and whose S/N value is high. The ferromagnetic thin film as the magnetic film of the magnetic recording medium is such that the fluctuation field of magnetic viscosity at 25° C. at the field strength equal to remanence coercivity or coercivity is not less than 15 oersteds and the coercivity is not less than 2000 oersteds.
摘要翻译：铁磁性薄膜用于提供噪声低且S / N值高的磁记录介质。作为磁记录介质的磁性膜的铁磁性薄膜使得在等于剩磁矫顽力或矫顽力的场强下，25℃下磁力粘度的波动范围不小于15奥斯特，矫顽力不小于 2000奥斯特。

28. 发明授权

US06815083B2 Perpendicular magnetic recording medium and process of production thereof 失效
标题翻译：垂直磁记录介质及其生产工艺
公开(公告)号：US06815083B2
公开(公告)日：2004-11-09
申请号：US10217478
申请日：2002-08-14
申请人： Hiroaki Nemoto , Hiroyuki Nakagawa , Yuzuru Hosoe
发明人： Hiroaki Nemoto , Hiroyuki Nakagawa , Yuzuru Hosoe
IPC分类号： G11B5673
CPC分类号： G11B5/84 , G11B5/656 , G11B5/66 , G11B2005/0029 , Y10T428/12646 , Y10T428/12875 , Y10T428/12931 , Y10T428/24975 , Y10T428/265
摘要： A perpendicular magnetic recording medium, which has a low level of recording noise and sufficiently large perpendicular magnetic anisotropy energy relative to demagnetizing field energy, includes a substrate and a multi-layered magnetic film. The multi-layered magnetic film is composed of ferromagnetic metal layers of Co alloy containing at least Cr and non-magnetic metal layers of Pd alloy, each one layer of which are laminated alternately on top of one layer of the other. The ferromagnetic metal layers and the non-magnetic metal layers have a thickness of d1 and d2, respectively, with the ratio of d1/d2 being in the range of 1.5 to 4.0. This specific layer structure reduces the magnetic exchange interaction between magnetic particles in the multi-layered magnetic film. Therefore, the perpendicular magnetic recording medium is stable against thermal disturbance and has a low level of recording noise.
摘要翻译：相对于去磁场能量，具有低水平的记录噪声和足够大的垂直磁各向异性能的垂直磁记录介质包括基底和多层磁性膜。多层磁性膜由至少含有Cr的Co合金的铁磁性金属层和Pd合金的非磁性金属层构成，其中的每一层交替层叠在另一层之上。强磁性金属层和非磁性金属层的厚度分别为d1和d2，d1 / d2的比例在1.5至4.0的范围内。该特定的层结构减少了多层磁性膜中磁性颗粒之间的磁交换相互作用。因此，垂直磁记录介质对于热干扰是稳定的并且具有低水平的记录噪声。

29. 发明授权

US06692843B2 Magnetic recording medium, method of fabricating magnetic recording medium, and magnetic storage 失效
标题翻译：磁记录介质，制造磁记录介质的方法和磁存储
公开(公告)号：US06692843B2
公开(公告)日：2004-02-17
申请号：US09784078
申请日：2001-02-16
申请人： Yoshibumi Matsuda , Akira Ishikawa , Yotsuo Yahisa , Yuzuru Hosoe , Tetsuya Kanbe , Koji Sakamoto
发明人： Yoshibumi Matsuda , Akira Ishikawa , Yotsuo Yahisa , Yuzuru Hosoe , Tetsuya Kanbe , Koji Sakamoto
IPC分类号： G11B573
CPC分类号： G11B5/7325 , G11B5/8404 , Y10T428/1266 , Y10T428/12667
摘要： A magnetic recording medium having first undercoating layers 40, 40′ formed directly or via substrate face undercoating layers on a substrate 40, second undercoating layers 42, 42′ directly formed on the first undercoating layers 40, 40′, magnetic films 43, 43′ formed on the second undercoating layers 42, 42′, and protective films 44, 44′ formed on the magnetic films 43, 43′. Clusters having a large amount of oxygen are dispersed on the boundary face of the first and second undercoating layers. Preferably, the first undercoating layer is made of an alloy which includes two kinds of elements in which the difference between oxide formation standard free energies &Dgr;G° of the elements at the temperature of 250° C. is large.
摘要翻译：一种磁记录介质，其具有直接形成在衬底40上的衬底表面底涂层形成的第一底涂层40,40'，直接形成在第一底涂层40,40'上的第二底涂层42,42'，磁性膜43,43' 形成在第二底涂层42,42'上，以及形成在磁性膜43,43'上的保护膜44,44'。具有大量氧的簇分散在第一和第二底涂层的边界面上。优选地，第一底涂层由包含两种元素的合金制成，其中在250℃的温度下元素的氧化物形成标准自由能的差ΔG°大。

30. 发明授权

US06544667B1 Magnetic recording medium, producing method of the same and magnetic recording system 失效
标题翻译：磁记录介质，制作方法及磁记录系统
公开(公告)号：US06544667B1
公开(公告)日：2003-04-08
申请号：US09523381
申请日：2000-03-10
申请人： Yuzuru Hosoe , Yoshibumi Matsuda , Yotsuo Yahisa , Kiwamu Tanahashi , Hiroyuki Suzuki , Koji Sakamoto , Akira Kato
发明人： Yuzuru Hosoe , Yoshibumi Matsuda , Yotsuo Yahisa , Kiwamu Tanahashi , Hiroyuki Suzuki , Koji Sakamoto , Akira Kato
IPC分类号： G11B565
CPC分类号： G11B5/7325 , G11B5/656 , G11B5/732 , G11B5/851 , Y10T428/12465 , Y10T428/12833 , Y10T428/1284 , Y10T428/12854 , Y10T428/12875 , Y10T428/26 , Y10T428/265
摘要： In a magnetic recording medium having Co-based alloy magnetic layer containing Pt formed on a substrate through an underlayer, by forming said underlayer with plural underlayers including double layer structure which is formed by piling up 1st underlayer of Cr-based alloy containing Ti and 2nd underlayer of Cr-based alloy containing at least one element selected from a group comprising Mo and W in this sequence, crystal grain diameter is decreased and then medium noise can be decreased, and c axis is oriented to in-plane direction and then high coercivity can be obtained, consequently the magnetic recording medium having high signal to noise ratio at high recording density region is obtained. Further a small size large capacity magnetic recording system can be provided by combination of said magnetic recording media with a MR (magnetoresistive) head.
摘要翻译：在具有通过底层形成在基板上的具有Co的Co基合金磁性层的磁记录介质中，通过将包含双层结构的多个底层形成所述底层，所述双层结构通过堆叠含有Ti和第二层的Cr基合金的第一底层而形成在该顺序中含有选自Mo和W的至少一种元素的Cr基合金的下层，晶粒直径减小，然后可以降低中等噪声，并且c轴取向于面内方向，然后取向于高矫顽力可以得到在高记录密度区域具有高信噪比的磁记录介质。此外，可以通过所述磁记录介质与MR（磁阻）磁头的组合来提供小尺寸的大容量磁记录系统。

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