公开(公告)号：US06177208B1

公开(公告)日：2001-01-23

申请号：US09317852

申请日：1999-05-25

申请人： Tomoo Yamamoto ,  Nobuyuki Inaba ,  Masukazu Igarashi ,  Masaaki Futamoto ,  Yuzuru Hosoe ,  Ichiro Tamai ,  Emi Mangyo ,  Kazusuke Yamanaka

发明人： Tomoo Yamamoto ,  Nobuyuki Inaba ,  Masukazu Igarashi ,  Masaaki Futamoto ,  Yuzuru Hosoe ,  Ichiro Tamai ,  Emi Mangyo ,  Kazusuke Yamanaka

IPC分类号： G11B566

CPC分类号： B82Y10/00 ,  G11B5/00 ,  G11B5/012 ,  G11B5/3903 ,  G11B5/656 ,  G11B5/82 ,  G11B2005/3996 ,  Y10S428/90

摘要： A magnetic recording system high in S/N and low in bit error rate, capable of carrying out writing and reading of high recording density of at least 1 gigabit per 1 square inch and high in reliability can be realized by making the magnetic layer of the magnetic recording medium from a mixture comprising at least one non-magnetic compound selected from the group consisting of oxides and nitrides and a magnetic material comprising Co and Pt as main components and specifying the molar ratio of Pt to Co in the magnetic layer, and employing a magnetoresistive read back magnetic recording head.

摘要翻译： 可以实现高S / N的磁记录系统和低误码率，能够执行至少1吉比特/ 1平方英寸的高记录密度的写入和读取以及可靠性高的磁记录系统。 来自包含选自氧化物和氮化物的至少一种非磁性化合物和包含Co和Pt作为主要成分的磁性材料并指定磁性层中Pt与Co的摩尔比的混合物的磁记录介质，并且使用 磁阻回读磁记录头。

公开(公告)号：US5919581A

公开(公告)日：1999-07-06

申请号：US670121

申请日：1996-06-25

申请人： Tomoo Yamamoto ,  Nobuyuki Inaba ,  Masukazu Igarashi ,  Masaaki Futamoto ,  Yuzuru Hosoe ,  Ichiro Tamai ,  Emi Mangyo ,  Kazusuke Yamanaka

发明人： Tomoo Yamamoto ,  Nobuyuki Inaba ,  Masukazu Igarashi ,  Masaaki Futamoto ,  Yuzuru Hosoe ,  Ichiro Tamai ,  Emi Mangyo ,  Kazusuke Yamanaka

IPC分类号： G11B5/66 ,  G11B5/00 ,  G11B5/012 ,  G11B5/39 ,  G11B5/64 ,  G11B5/65 ,  G11B5/738 ,  G11B5/82 ,  G11B20/14 ,  G11B5/68 ,  G11B5/706

CPC分类号： B82Y10/00 ,  G11B5/00 ,  G11B5/3903 ,  G11B5/656 ,  G11B2005/3996 ,  G11B5/012 ,  G11B5/82 ,  Y10S428/90

摘要： A magnetic recording system high in S/N and low in bit error rate, capable of carrying out writing and reading of high recording density of at least 1 gigabit per 1 square inch and high in reliability can be realized by making the magnetic layer of the magnetic recording medium from a mixture comprising at least one non-magnetic compound selected from the group consisting of oxides and nitrides and a magnetic material comprising Co and Pt as main components and specifying the molar ratio of Pt to Co in the magnetic layer, and employing a magnetoresistive read back magnetic recording head.

摘要翻译： 可以实现高S / N的磁记录系统和低误码率，能够执行至少1吉比特/ 1平方英寸的高记录密度的写入和读取以及可靠性高的磁记录系统。 来自包含选自氧化物和氮化物的至少一种非磁性化合物和包含Co和Pt作为主要成分的磁性材料并指定磁性层中Pt与Co的摩尔比的混合物的磁记录介质，并且使用 磁阻回读磁记录头。

公开(公告)号：US20050123806A1

公开(公告)日：2005-06-09

申请号：US11036064

申请日：2005-01-18

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： A magnetic recording medium having a substrate, an under-layer formed on the substrate, a magnetic layer formed on the substrate and a protective layer formed on the magnetic layer. The magnetic layer comprises Co, Cr and Pt with a thickness being from 10 nm to 22 nm. Further, a coercivity of the magnetic layer is not less than 2000 Oe, and a fluctuation field of magnetic viscosity at a field strength equal to remanence coercivity or coercivity is not less than 30 Oe.

摘要翻译： 具有基板的磁记录介质，在基板上形成的下层，形成在基板上的磁性层和形成在磁性层上的保护层。 磁性层包括厚度为10nm至22nm的Co，Cr和Pt。 此外，磁性层的矫顽力不小于2000Oe，磁场强度等于剩磁矫顽力或矫顽磁力的磁场粘度的波动范围不小于30Oe。

公开(公告)号：US06613428B2

公开(公告)日：2003-09-02

申请号：US09849404

申请日：2001-05-07

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： G11B564

CPC分类号： G11B5/64 ,  Y10T428/12465 ,  Y10T428/12986 ,  Y10T428/265 ,  Y10T428/31

摘要： A thin film magnetic recording medium including a magnetic layer having a fluctuation field defined as S/Xirr, where S is magnetic viscosity and Xirr is irreversible susceptibility Xirr. The fluctuation field of the magnetic layer is not less than 15 oersteds.

摘要翻译： 一种薄膜磁记录介质，包括具有定义为S / Xirr的波动场的磁性层，其中S是磁粘度和Xirr是不可逆的磁化率Xirr。 磁性层的波动场不小于15奥斯特。

公开(公告)号：US06310748B1

公开(公告)日：2001-10-30

申请号：US08521363

申请日：1995-08-31

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： G11B566

CPC分类号： G11B5/64 ,  Y10T428/12465 ,  Y10T428/12986 ,  Y10T428/265 ,  Y10T428/31

摘要： A ferromagnetic thin film is used to provide a magnetic recording medium whose noise is low and whose S/N 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： 铁磁薄膜用于提供噪声低且S / N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。

公开(公告)号：US07157162B2

公开(公告)日：2007-01-02

申请号：US11036064

申请日：2005-01-18

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： G11B5/65

CPC分类号： G11B5/64 ,  Y10T428/12465 ,  Y10T428/12986 ,  Y10T428/265 ,  Y10T428/31

摘要： A magnetic recording medium having a substrate, an under-layer formed on the substrate, a magnetic layer formed on the substrate and a protective layer formed on the magnetic layer. The magnetic layer comprises Co, Cr and Pt with a thickness being from 10 nm to 22 nm. Further, a coercivity of the magnetic layer is not less than 2000 Oe, and a fluctuation field of magnetic viscosity at a field strength equal to remanence coercivity or coercivity is not less than 30 Oe.

摘要翻译： 具有基板的磁记录介质，在基板上形成的下层，形成在基板上的磁性层和形成在磁性层上的保护层。 磁性层包括厚度为10nm至22nm的Co，Cr和Pt。 此外，磁性层的矫顽力不小于2000Oe，磁场强度等于剩磁矫顽力或矫顽磁力的磁场粘度的波动范围不小于30Oe。

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。

公开(公告)号：US06572988B1

公开(公告)日：2003-06-03

申请号：US09385682

申请日：1999-08-30

申请人： Nobuyuki Inaba ,  Kazuetsu Yoshida ,  Kazusuke Yamanaka ,  Fumiyoshi Kirino ,  Masaaki Futamoto

发明人： Nobuyuki Inaba ,  Kazuetsu Yoshida ,  Kazusuke Yamanaka ,  Fumiyoshi Kirino ,  Masaaki Futamoto

IPC分类号： G11B566

CPC分类号： G11B5/656 ,  G11B5/64 ,  G11B5/66 ,  Y10S428/90 ,  Y10T428/12465 ,  Y10T428/12861 ,  Y10T428/26

摘要： A magnetic recording medium has a magnetic recording film in which the magnitude of saturation magnetization Ms(T=5° K) at 5° K and magnitude of saturation magnetization Ms(T=300° K) at 300° K satisfy: Ms(T=300° K)/Ms(T=5° K)≧0.75. The recording medium enables the high-density recording, and a magnetic recording apparatus using this recording medium can yield a sufficiently high reproduction signal level within the operating temperature range of the apparatus.

摘要翻译： 磁记录介质具有磁记录膜，其中在5°K的饱和磁化强度Ms（T = 5°K）和饱和磁化强度Ms（T = 300°K）在300°K时满足：Ms（T = 300°K）/ Ms（T = 5°K）> = 0.75。 记录介质能够进行高密度记录，并且使用该记录介质的磁记录装置可以在装置的工作温度范围内产生足够高的再现信号电平。

公开(公告)号：US6083599A

公开(公告)日：2000-07-04

申请号：US922763

申请日：1997-09-03

申请人： Yoshiyuki Hirayama ,  Masaaki Futamoto ,  Yukio Honda ,  Kazusuke Yamanaka ,  Kenya Ito

发明人： Yoshiyuki Hirayama ,  Masaaki Futamoto ,  Yukio Honda ,  Kazusuke Yamanaka ,  Kenya Ito

IPC分类号： G11B5/64 ,  G11B5/66

CPC分类号： G11B5/656 ,  G11B5/64 ,  G11B5/66 ,  Y10S428/90 ,  Y10T428/265

摘要： A perpendicular magnetic recording medium is provided by using a ferromagnetic polycrystalline thin film having main components of cobalt and chromium in which the coercivity is 1500 oersted or more and the fluctuation field of magnetic viscosity is 30 oersted or more; the film thickness is controlled within a range from 30 nm to 100 nm. A perpendicular magnetic recording medium with low noise and high output which is suited for high density recording can be obtained and a large capacity magnetic recording and reproducing apparatus can be provided by using this medium.

摘要翻译： 通过使用其中矫顽力为1500奥斯特或更高矫顽磁力的主要成分为钴和铬的铁磁性多晶薄膜，并且磁粘度的波动场为30奥斯特或更高，提供垂直磁记录介质; 膜厚控制在30nm至100nm的范围内。 可以获得适合于高密度记录的具有低噪声和高输出的垂直磁记录介质，并且可以通过使用该介质来提供大容量磁记录和再现装置。

公开(公告)号：US06706426B1

公开(公告)日：2004-03-16

申请号：US09523521

申请日：2000-03-10

申请人： Tomoo Yamamoto ,  Akira Ishikawa ,  Kazusuke Yamanaka ,  Atsushi Nakamura

发明人： Tomoo Yamamoto ,  Akira Ishikawa ,  Kazusuke Yamanaka ,  Atsushi Nakamura

IPC分类号： G11B564

CPC分类号： B82Y10/00 ,  G11B5/00 ,  G11B5/656 ,  G11B5/7325

摘要： To obtain a large capacity magnetic recording medium capable of recording at a super high density of 3 Gbit or more per one square inch and a magnetic storage apparatus, a magnetic recording medium is prepared by disposing orientation control layers 31, 31′ having at least a B2 (CsCl) structure on a substrate 30, disposing a first underlayer comprising Cr and a second underlayer containing at least one element selected from Cr, Nb, Mo, Ta, W and Ti and having a lattice constant greater than that of the first underlayer and then forming a magnetic layer comprising Co as the main ingredient. A magnetic storage apparatus is constituted by combining the magnetic recording medium, a magnetic head comprising a recording system and a read out system opposed to each of the surfaces of the magnetic recording medium, a unit for moving the magnetic head relative to the magnetic recording medium and a read/write signal processing system for waveform processing of input signals and output signals to and from the magnetic head.

摘要翻译： 为了获得能够以每平方英寸3G以上的超高密度记录的大容量磁记录介质和磁存储装置，通过设置具有至少一个平方英寸的取向控制层31,31'来制备磁记录介质 B2（CsCl）结构，设置包含Cr的第一底层和含有选自Cr，Nb，Mo，Ta，W和Ti中的至少一种元素的第二底层，其晶格常数大于第一底层的晶格常数 然后形成包含Co作为主要成分的磁性层。 磁存储装置是通过组合磁记录介质，包括记录系统的磁头和与磁记录介质的每个表面相对的读出系统构成的，用于使磁头相对于磁记录介质移动的单元 以及用于对输入信号进行波形处理和从磁头输出信号的读/写信号处理系统。