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1. 发明授权

US06740383B2 Magnetic recording medium possessing a ratio of Hc(perpendicular) to Hc(horizontal) that is not more than 0.22 and magnetic recording disk device 失效
标题翻译：具有Hc（垂直）与Hc（水平）之比不大于0.22的磁记录介质和磁记录盘装置
公开(公告)号：US06740383B2
公开(公告)日：2004-05-25
申请号：US09275578
申请日：1999-03-24
申请人： Masayoshi Shinohara , Kenji Sato , Yuki Yoshida , Iwao Okamoto , Yasuji Ikeda , Kiyoshi Yamaguchi
发明人： Masayoshi Shinohara , Kenji Sato , Yuki Yoshida , Iwao Okamoto , Yasuji Ikeda , Kiyoshi Yamaguchi
IPC分类号： G11B573
CPC分类号： B82Y25/00 , B82Y10/00 , G11B5/012 , G11B5/4886 , G11B5/656 , G11B5/72 , G11B5/7325 , G11B2005/3996 , Y10T428/24355 , Y10T428/24975
摘要： A magnetic recording medium and a magnetic disk device using the same. The magnetic recording medium comprising a nonmagnetic substrate having applied thereon, through two or more chromium-based underlayers, a magnetic recording layer having a circumferential direction of easy magnetization and containing cobalt as a principal component thereof, and also containing chromium and platinum in combination with tantalum or tantalum and niobium. Using the magnetic recording medium, a reproducing output and S/N ratio can be increased without causing an increase in noise.
摘要翻译：磁记录介质及使用其的磁盘装置。该磁记录介质包括通过两个或多个铬基底层施加在其上的非磁性基底，具有容易磁化的圆周方向并且含有钴作为其主要成分的磁记录层，并且还含有铬和铂与钽或钽和铌。使用磁记录介质，可以增加再现输出和S / N比，而不会增加噪声。

2. 发明授权

US06071607A Magnetic recording medium and magnetic disk device 失效
标题翻译：磁记录介质和磁盘装置
公开(公告)号：US06071607A
公开(公告)日：2000-06-06
申请号：US797685
申请日：1997-01-31
申请人： Chiaki Okuyama , Kenji Sato , Iwao Okamoto , Masayoshi Shinohara
发明人： Chiaki Okuyama , Kenji Sato , Iwao Okamoto , Masayoshi Shinohara
IPC分类号： C22C19/07 , G11B5/02 , G11B5/39 , G11B5/64 , G11B5/65 , G11B5/66 , G11B5/73 , G11B5/738 , G11B5/85 , G11B5/851 , H01F10/16
CPC分类号： G11B5/7325 , G11B5/64 , G11B5/656 , G11B5/66 , Y10S428/90 , Y10T428/265
摘要： A magnetic recording medium comprising a nonmagnetic substrate and a magnetic recording film of a magnetic metal material deposited through a primer layer of a nonmagnetic metal material on the substrate, wherein the primer layer is formed of a metallic material composed mainly of chromium or chromium and molybdenum and the magnetic recording film is formed of a metallic material composed mainly of at least one member selected from the group consisting of cobalt, chromium, tantalum, and platinum. The magnetic recording medium enables high-density recording by taking advantage of high coercive force and, at the same time, can reduce the noise level and improve the S/N ratio.
摘要翻译：一种磁记录介质，包括非磁性基底和磁性金属材料的磁记录膜，所述磁性金属材料通过非磁性金属材料的底涂层沉积在基底上，其中底漆层由主要由铬或铬和钼组成的金属材料形成并且磁记录膜由主要由选自钴，铬，钽和铂中的至少一种构成的金属材料形成。磁记录介质可以通过利用高矫顽力实现高密度记录，并且同时可以降低噪声水平并提高S / N比。

3. 发明授权

US06534204B1 Magnetic storage medium 失效
标题翻译：磁存储介质
公开(公告)号：US06534204B1
公开(公告)日：2003-03-18
申请号：US09405725
申请日：1999-09-24
申请人： Hideyuki Akimoto , Yuki Yoshida , Kenji Sato , Iwao Okamoto
发明人： Hideyuki Akimoto , Yuki Yoshida , Kenji Sato , Iwao Okamoto
IPC分类号： G11B566
CPC分类号： G11B5/7325 , G11B5/66 , Y10S428/90
摘要： There is provided a magnetic storage medium capable of recording information at high recording density and also regenerating the information with a high quality of signal (high S/Nm), and in addition contributing to the elongation of a life span of the recorded information. The magnetic storage medium comprises a non-magnetic substrate, a plurality of magnetic recording layers of ferromagnetism formed on the non-magnetic substrate, and a dividing layer of antiferromagnetism for dividing said plurality of magnetic recording layers from one another through intervening between the magnetic recording layer-to-layer.
摘要翻译：提供了能够以高记录密度记录信息并且还以高质量信号（高S / Nm）再生信息的磁存储介质，并且还有助于延长记录信息的使用寿命。磁存储介质包括非磁性衬底，形成在非磁性衬底上的多个磁性磁记录层，以及用于通过介于磁记录之间的方式将所述多个磁记录层彼此分开的反铁磁分隔层层到层。

4. 发明授权

US6129981A Magnetic recording medium and magnetic recording disk device 失效
标题翻译：磁记录介质和磁记录盘装置
公开(公告)号：US6129981A
公开(公告)日：2000-10-10
申请号：US187082
申请日：1998-11-06
申请人： Chiaki Okuyama , Kenji Sato , Yuki Yoshida , Iwao Okamoto
发明人： Chiaki Okuyama , Kenji Sato , Yuki Yoshida , Iwao Okamoto
IPC分类号： G11B5/64 , G11B5/65 , G11B5/66 , G11B5/738
CPC分类号： G11B5/656 , G11B5/66 , Y10S428/90 , Y10T428/26 , Y10T428/265
摘要： A magnetic recording medium and a magnetic disk device using the same. The magnetic recording medium comprising a nonmagnetic substrate having applied thereon, through a chromium-based underlayer, at least one magnetic recording layer consisting of cobalt as a principal component, 14 to 23 at % of chromium, 1 to 20 at % of platinum as well as tungsten and carbon. The magnetic recording medium exhibits reduced noise, an improved resolution of the reproducing waveforms and an increased S/N ratio.
摘要翻译：磁记录介质及使用其的磁盘装置。该磁记录介质包括其上施加有非磁性基底，通过铬基底层，至少一个由钴作为主要成分组成的磁记录层，14至23at％的铬，1至20at％的铂以及作为钨和碳。磁记录介质表现出降低的噪声，改善了再现波形的分辨率和增加的S / N比。

5. 发明授权

US06020060A Magnetic recording medium, process for producing the same and magnetic disk device 失效
标题翻译：磁记录介质，其制造方法和磁盘装置
公开(公告)号：US06020060A
公开(公告)日：2000-02-01
申请号：US44639
申请日：1998-03-19
申请人： Yuki Yoshida , Chiaki Okuyama , Kenji Sato , Iwao Okamoto
发明人： Yuki Yoshida , Chiaki Okuyama , Kenji Sato , Iwao Okamoto
IPC分类号： G11B5/012 , G11B5/39 , G11B5/64 , G11B5/65 , G11B5/66 , G11B5/73 , G11B5/738 , G11B5/84 , G11B5/85 , G11B5/851
CPC分类号： B82Y25/00 , B82Y10/00 , G11B5/012 , G11B5/66 , G11B5/7325 , G11B5/8404 , G11B2005/3996 , Y10T428/26 , Y10T428/265
摘要： A magnetic recording medium characterized by comprising: a nonmagnetic substrate; and, provided on the nonmagnetic substrate in the following order, a first underlayer of a nonmagnetic material composed mainly of chromium, a second underlayer of an antiferromagnetic material, with a body-centered cubic structure, having a Neel temperature of at least 60.degree. C., the second underlayer being such that, when the crystal lattice of the antiferromagnetic material is compared with the crystal lattice in the body-centered cubic structure of the first underlayer, the length of a side of the lattice in the (100) face of the former is approximately equal to the length of a diagonal of the lattice in the (100) face of the latter, permitting the second underlayer to be epitaxially grown onto the first underlayer, and a recording layer of a magnetic material composed mainly of cobalt.
摘要翻译：一种磁记录介质，其特征在于包括：非磁性基板; 在非磁性基板上按以下顺序设置主要由铬构成的非磁性材料的第一底层，具有体心立方结构的反铁磁材料的第二底层，具有N + E，acu e + EE el的温度为至少60℃，第二底层使得当反铁磁材料的晶格与第一底层的体心立方结构中的晶格相比较时，前者的（100）面中的晶格近似等于后者的（100）面中的晶格的对角线的长度，允许第二底层外延生长到第一底层上，并且记录层主要由钴组成的磁性材料。

6. 发明授权

US5774783A Magnetic recording medium 失效
标题翻译：磁记录介质
公开(公告)号：US5774783A
公开(公告)日：1998-06-30
申请号：US594762
申请日：1996-01-31
申请人： Isatake Kaitsu , Iwao Okamoto , Masayoshi Shinohara
发明人： Isatake Kaitsu , Iwao Okamoto , Masayoshi Shinohara
IPC分类号： B32B15/04 , G11B5/64 , G11B5/66 , G11B5/70 , G11B5/714 , G11B5/855 , H01F1/00
CPC分类号： G11B5/65 , G11B5/714 , G11B5/855 , Y10S428/90 , Y10T428/115 , Y10T428/12014 , Y10T428/12118 , Y10T428/12465 , Y10T428/12861 , Y10T428/31678
摘要： The present invention relates to a magnetic recording medium for use in an external memory device of an information processing apparatus etc., and an object thereof is to reduce noise, achieve high coercive force, and use the substance as a magnetic recording medium for detecting signals in a magnetoresistance head. In the magnetic recording medium comprising the magnetic recording layer 25 including ferromagnetic grains 22 and a nonmagnetic substance 23, the improvement in structure comprises that the ferromagnetic grains 22 are formed to have respectively an average grain diameter of 50 nm or less and not to be overlapped in the film thickness direction and to be isolated in the direction along a layer surface, and that a product of residual magnetization and a film thickness of the magnetic recording layer 25 is less than or equal to 150 Gauss.cndot..mu.m.
摘要翻译：本发明涉及用于信息处理装置等的外部存储装置的磁记录介质，其目的在于降低噪声，实现高矫顽力，并且使用该物质作为检测信号的磁记录介质在磁阻头。在包括磁铁颗粒22和非磁性物质23的磁记录层25的磁记录介质中，结构的改进包括：形成铁磁颗粒22的平均粒径为50nm以下，不重叠并且沿着层表面的方向隔离，并且磁记录层25的剩余磁化强度和膜厚度的乘积小于或等于150高斯。亩

7. 发明授权

US5900323A Magnetic recording medium and magnetic recording drive 失效
标题翻译：磁记录介质和磁记录驱动
公开(公告)号：US5900323A
公开(公告)日：1999-05-04
申请号：US537432
申请日：1995-10-02
申请人： Iwao Okamoto , Hideyuki Akimoto , Masayoshi Shinohara
发明人： Iwao Okamoto , Hideyuki Akimoto , Masayoshi Shinohara
IPC分类号： G11B5/66 , G11B5/00 , G11B5/012 , G11B5/39 , G11B5/64 , G11B5/65 , G11B5/73 , G11B5/738
CPC分类号： G11B5/7325 , G11B5/00 , G11B5/012 , G11B5/39 , Y10S428/90 , Y10T428/12632 , Y10T428/12854 , Y10T428/12903 , Y10T428/265
摘要： A non-magnetic substrate, a Cu layer having a film thickness ranging from 0.5 to 10 nm, a Cr layer having a film thickness of 100 nm or less, a magnetic layer made of CoCrPt alloy in which a percentage content of Cr ranges from 12 atoms % to 20 atoms % and a percentage content of Pt ranges from 4 atoms % to 18 atoms %, a protective layer and a lubricating layer are arranged in that order to form a magnetic recording medium. Because the Cu layer is sufficiently thinned, a medium noise is sufficiently reduced, and a medium S/N ratio is sufficiently heightened. Because the film thickness of the Cr layer is 100 nm or less, the medium noise is reduced. Because the composition of CoCrPt alloy is limited in the magnetic layer, the medium S/N ratio is heightened. In addition, it is preferred that another Cu layer having a film thickness ranging from 0.5 to 10 nm be inserted into the magnetic layer to divide the magnetic layer into two layers. In this case, the medium noise is reduced by 20%, and the medium S/N ratio is heightened. Therefore, even though a magnetoresistive effect type magnetic head is used to record or reproduce information in/from the magnetic recording medium, the medium noise is sufficiently reduced, and the medium R/N ratio is sufficiently heightened.
摘要翻译：非磁性基板，膜厚度为0.5〜10nm的Cu层，膜厚度为100nm以下的Cr层，由Cr含量为12的CoCrPt合金制成的磁性层，原子％至20原子％，Pt的百分含量范围为4原子％至18原子％，保护层和润滑层按顺序排列以形成磁记录介质。因为Cu层被充分地变薄，所以中等噪声被充分地减小，并且介质S / N比被充分提高。由于Cr层的膜厚为100nm以下，因此中等噪声降低。由于CoCrPt合金的组成在磁性层中受到限制，所以介质S / N比提高。此外，优选将膜厚度范围为0.5〜10nm的另一Cu层插入到磁性层中，以将磁性层分成两层。在这种情况下，中等噪声降低20％，中等S / N比提高。因此，即使使用磁阻效应型磁头在磁记录介质中记录信息或从磁记录介质再现信息，也能够充分降低介质噪声，提高介质R / N比。

8. 再颁专利

USRE38587E1 Magnetic recording medium 失效
公开(公告)号：USRE38587E1
公开(公告)日：2004-09-14
申请号：US09610206
申请日：2000-06-30
申请人： Isatake Kaitsu , Iwao Okamoto , Masayoshi Shinohara
发明人： Isatake Kaitsu , Iwao Okamoto , Masayoshi Shinohara
IPC分类号： G11B564
CPC分类号： G11B5/65 , G11B5/714 , G11B5/855 , Y10S428/90 , Y10T428/115 , Y10T428/12014 , Y10T428/12118 , Y10T428/12465 , Y10T428/12861 , Y10T428/31678
摘要： The present invention relates to a magnetic recording medium for use in an external memory device of an information processing apparatus etc., and an object thereof is to reduce noise, achieve high coercive force, and use the substance as a magnetic recording medium for detecting signals in a magnetoresistance head. In the magnetic recording medium comprising the magnetic recording layer 25 including ferromagnetic grains 22 and a nonmagnetic substance 23, the improvement in structure comprises that the ferromagnetic grains 22 are formed to have respectively an average grain diameter of 50 nm or less and not to be overlapped in the film thickness direction and to be isolated in the direction along a layer surface, and that a product of residual magnetization and a film thickness of the magnetic recording layer 25 is less than or equal to 150 Gauss•&mgr;m.

9. 发明授权

US06753101B1 Magnetic recording medium, magnetic storage apparatus, recording method and method of producing magnetic recording medium 失效
标题翻译：磁记录介质，磁存储装置，制造磁记录介质的记录方法和方法
公开(公告)号：US06753101B1
公开(公告)日：2004-06-22
申请号：US09588850
申请日：2000-06-06
申请人： E. Noel Abarra , Iwao Okamoto , Yoshifumi Mizoshita , Yuki Yoshida
发明人： E. Noel Abarra , Iwao Okamoto , Yoshifumi Mizoshita , Yuki Yoshida
IPC分类号： G11B566
CPC分类号： G11B5/66 , G11B5/74 , G11B5/82 , G11B2005/0002 , Y10S428/90 , Y10T428/24942 , Y10T428/265
摘要： A magnetic recording medium is provided with at least one exchange layer structure, and a magnetic layer formed on the exchange layer structure. The exchange layer structure includes a ferromagnetic layer and a non-magnetic coupling layer provided on the ferromagnetic layer and under the magnetic layer.
摘要翻译：磁记录介质具有至少一个交换层结构和形成在交换层结构上的磁性层。交换层结构包括铁磁层和设置在铁磁层上和磁层下面的非磁性耦合层。

10. 发明授权

US06689496B1 Magnetic recording medium, method of producing magnetic recording medium, and magnetic storage apparatus 失效
标题翻译：磁记录介质，磁记录介质的制造方法以及磁存储装置
公开(公告)号：US06689496B1
公开(公告)日：2004-02-10
申请号：US09716386
申请日：2000-11-20
申请人： Haruhiro Komura , Yuki Yoshida , Hisashi Umeda , Iwao Okamoto
发明人： Haruhiro Komura , Yuki Yoshida , Hisashi Umeda , Iwao Okamoto
IPC分类号： G11B566
CPC分类号： G11B5/732 , G11B5/656 , G11B5/7325 , G11B5/84 , Y10S428/90 , Y10T428/12465 , Y10T428/12854 , Y10T428/12931 , Y10T428/24942 , Y10T428/265
摘要： A magnetic recording medium includes a substrate, a nonmagnetic seed layer provided on the substrate, and a magnetic layer provided on the nonmagnetic seed layer via one or a plurality of layers. The nonmagnetic seed layer is made of NiAl having an oxygen concentration of approximately 1500 to 4000 ppm.
摘要翻译：磁记录介质包括基板，设置在基板上的非磁性种子层，以及经由一个或多个层设置在非磁性种子层上的磁性层。非磁性种子层由氧浓度为约1500〜4000ppm的NiAl制成。

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