公开(公告)号：US5815343A

公开(公告)日：1998-09-29

申请号：US967346

申请日：1997-10-27

申请人： Akira Ishikawa ,  Yoshihiro Shiroishi ,  Yuzuru Hosoe ,  Yotsuo Yahisa ,  Tomoo Yamamoto ,  Masukazu Igarashi ,  Akira Osaki ,  Yoshiki Kato ,  Jun Fumioka

发明人： Akira Ishikawa ,  Yoshihiro Shiroishi ,  Yuzuru Hosoe ,  Yotsuo Yahisa ,  Tomoo Yamamoto ,  Masukazu Igarashi ,  Akira Osaki ,  Yoshiki Kato ,  Jun Fumioka

IPC分类号： G11B5/012 ,  G11B5/39 ,  G11B5/62 ,  G11B5/64 ,  G11B5/66 ,  G11B5/73 ,  G11B5/84 ,  G11B5/78 ,  G11B5/82 ,  G11B17/00

CPC分类号： G11B5/012 ,  G11B5/39 ,  G11B5/64 ,  G11B5/656 ,  G11B5/66 ,  G11B5/7315 ,  G11B5/7325 ,  G11B5/8404

摘要： A magnetic recording medium includes a non-magnetic substrate, and a magnetic layer provided on the non-magnetic substrate. The value of the product Br.sub.1 .delta. of the residual flux density Br.sub.1 of the magnetic layer determined in a recording direction and the thickness .delta. of the magnetic layer is not less than 5 G.mu.m and not more than 180 G.mu.m; the value of the ratio of Br.sub.1 to the residual flux density Br.sub.2 determined in a direction parallel to the substrate plane and perpendicular to the recording direction, Br.sub.1 /Br.sub.2, is not less than 1.3 and not more than 3; the surface of the non-magnetic substrate has texture grooves therein extending predominantly in the recording direction; and the average roughness factor Ra of the surface of the magnetic layer determined in a direction perpendicular to the substrate plane and perpendicular to the recording direction is not less than 0.3 nm and not more than 1.9 nm. Alternatively, the value of the product Br.delta. of the residual flux density Br of the magnetic layer determined in the recording direction and the thickness .delta. of the magnetic layer is not less than 5 G.mu.m and not more than 80 G.mu.m; and the value of the anisotropic magnetic field H.sub.k of the magnetic recording medium is not less than 7 kOe and not more than 20 kOe.

摘要翻译： 磁记录介质包括非磁性衬底和设置在非磁性衬底上的磁性层。 在记录方向上确定的磁性层的剩余磁通密度Br1和磁性层的厚度δ的乘积Br1δ的值不小于5Gm且不大于180Gm; 在平行于基板平面并垂直于记录方向Br1 / Br2的方向上确定的Br1与剩余通量密度Br2的比值不小于1.3且不大于3; 非磁性基板的表面具有主要在记录方向上延伸的织构槽; 并且在垂直于基板平面并垂直于记录方向的方向上确定的磁性层的表面的平均粗糙度Ra不小于0.3nm且不大于1.9nm。 或者，在记录方向上确定的磁性层的剩余磁通密度Br和磁性层的厚度δ的乘积Br delta的值不小于5Gm且不大于80Gm; 并且磁记录介质的各向异性磁场Hk的值不小于7kOe且不大于20kOe。

公开(公告)号：US06251532B1

公开(公告)日：2001-06-26

申请号：US08555415

申请日：1995-11-09

申请人： Masaaki Futamoto ,  Nobuyuki Inaba ,  Tomoo Yamamoto ,  Masukazu Igarashi ,  Yuzuru Hosoe ,  Akira Ishikawa

发明人： Masaaki Futamoto ,  Nobuyuki Inaba ,  Tomoo Yamamoto ,  Masukazu Igarashi ,  Yuzuru Hosoe ,  Akira Ishikawa

IPC分类号： B32B1501

CPC分类号： G11B5/656 ,  C22C27/06 ,  G11B5/64 ,  G11B5/66 ,  Y10S428/90

摘要： A magnetic recording medium capable of reducing noise and an error rate of the medium comprises a nonmagnetic substrate; a magnetic layer formed on the surface of the nonmagnetic substrate directly or through a nonmagnetic underlayer; and a protective layer formed on the magnetic layer. The magnetic recording medium satisfies the following relationships: −0.5≦{Hc(1)−Hc(p)}/Hc(1)≦0.3 Hc(1)≧2 kOe 20 G×&mgr;m≦Br(1)×t≦100 G×&mgr;m where Hc(1) is a corecivity of the magnetic layer measured in the longitudinal direction; Hc(p) is a coercivity of the magnetic layer measured in the perpendicular direction; Br(1) is a remanent magnetization of the magnetic layer measured in the longitudinal direction; and “t” is a layer thickness of the magnetic layer.

摘要翻译： 能够降低介质的噪声和误差率的磁记录介质包括非磁性衬底; 直接或通过非磁性底层形成在非磁性基片的表面上的磁性层; 以及形成在磁性层上的保护层。 磁记录介质满足以下关系：-0.5 <= {Hc（1）-Hc（p）} / Hc（1）<= 0.3Hc（1）> = 2 kOe20 Gxmum <= Br（1）xt < 100 Gxmum其中Hc（1）是沿纵向测量的磁性层的集中度; Hc（p）是在垂直方向上测量的磁性层的矫顽力; Br（1）是沿纵向测量的磁性层的剩磁; “t”为磁性层的层厚。

公开(公告)号：US06544672B1

公开(公告)日：2003-04-08

申请号：US09678382

申请日：2000-10-03

申请人： Masaaki Futamoto ,  Nobuyuki Inaba ,  Tomoo Yamamoto ,  Masukazu Igarashi ,  Yuzuru Hosoe ,  Akira Ishikawa

发明人： Masaaki Futamoto ,  Nobuyuki Inaba ,  Tomoo Yamamoto ,  Masukazu Igarashi ,  Yuzuru Hosoe ,  Akira Ishikawa

IPC分类号： G11B566

CPC分类号： G11B5/656 ,  C22C27/06 ,  G11B5/64 ,  G11B5/66 ,  Y10S428/90

摘要： Disclosed is a magnetic recording medium capable of reducing noise and an error rate of the medium. The medium comprises a nonmagnetic substrate; a magnetic layer formed on the surface of the nonmagnetic substrate directly or through a nonmagnetic underlayer; and a protective layer formed on the magnetic layer; wherein the magnetic recording medium satisfies the following relationships: −0.5≦{Hc(1)−Hc(p)}/Hc(1)≦0.3 Hc(1)≧2 kOe 20 G×&mgr;m≦Br(1)×t≦100 G×&mgr;m where Hc(1) indicates a corecivity of the magnetic layer measured in the longitudinal direction; Hc(p) indicates a coercivity of the magnetic layer measured in the perpendicular direction; Br(1) indicates a remanent magnetization of the magnetic layer measured in the longitudinal direction; and “t” indicates a layer thickness of the magnetic layer.

摘要翻译： 公开了能够降低介质的噪声和错误率的磁记录介质。 介质包括非磁性基底; 直接或通过非磁性底层形成在非磁性基片的表面上的磁性层; 以及形成在所述磁性层上的保护层; 其中所述磁记录介质满足以下关系：其中Hc（1）表示在纵向方向上测量的磁性层的堆积率; Hc（p）表示在垂直方向测量的磁性层的矫顽力; Br（1）表示在纵向测定的磁性层的残留磁化强度; “t”表示磁性层的层厚度。

公开(公告)号：US5906884A

公开(公告)日：1999-05-25

申请号：US518391

申请日：1995-08-15

申请人： Yotsuo Yahisa ,  Yoshibumi Matsuda ,  Joe Inagaki ,  Enji Fujita ,  Takao Yonekawa ,  Mitsuhiro Shoda ,  Akira Kato ,  Yuzuru Hosoe ,  Masukazu Igarashi

发明人： Yotsuo Yahisa ,  Yoshibumi Matsuda ,  Joe Inagaki ,  Enji Fujita ,  Takao Yonekawa ,  Mitsuhiro Shoda ,  Akira Kato ,  Yuzuru Hosoe ,  Masukazu Igarashi

IPC分类号： G11B5/66 ,  G11B5/65 ,  G11B5/73 ,  G11B5/82 ,  G11B33/08

CPC分类号： G11B5/7315 ,  G11B5/7325 ,  G11B5/82 ,  G11B33/08 ,  Y10S428/90

摘要： A magnetic recording medium has a substrate made of a nonmetal nonmagnetic material whose coefficient of linear expansion lies within a range from 0.000013/deg to 0.0001/deg. A magnetic layer is formed on the substrate as a thin polycrystalline film or a thin amorphous film. The magnetic layer has Co as a main component, which exhibits a negative magnetostrictive constant so that its coercive force rises in the direction of compressive strain. The magnetic layer is subjected to an in-plane compressive strain from the substrate due to a difference between the coefficient of thermal expansion of the substrate and the magnetic layer so that high coercivity is obtained in the magnetic layer.

摘要翻译： 磁记录介质具有由非金属非磁性材料制成的基板，其线性膨胀系数在0.000013 / deg至0.0001 / deg的范围内。 作为薄多晶膜或薄的无定形膜，在基板上形成磁性层。 磁性层具有Co作为主要成分，其表现出负的磁致伸缩常数，使其矫顽力沿压缩应变的方向上升。 由于衬底的热膨胀系数与磁性层之间的差异，磁性层受到来自衬底的面内压缩应变，从而在磁性层中获得高的矫顽力。

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：US6001447A

公开(公告)日：1999-12-14

申请号：US4318

申请日：1998-01-08

申请人： Kiwamu Tanahashi ,  Yuzuru Hosoe ,  Ichiro Tamai ,  Tetsuya Kanbe ,  Tomoo Yamamoto ,  Masukazu Igarashi ,  Yoshio Takahashi

发明人： Kiwamu Tanahashi ,  Yuzuru Hosoe ,  Ichiro Tamai ,  Tetsuya Kanbe ,  Tomoo Yamamoto ,  Masukazu Igarashi ,  Yoshio Takahashi

IPC分类号： G11B5/66 ,  G11B5/39 ,  G11B5/64 ,  G11B5/65 ,  G11B5/73 ,  G11B5/738 ,  H01F10/16

CPC分类号： G11B5/7325 ,  G11B5/64 ,  Y10S428/90 ,  Y10T428/265

摘要： The magnetic storage apparatus has a high reliability at a recording density of 2 gigabits or more per square inch. The longitudinal recording media necessary to realize the apparatus has a low media noise and is immune from the influence of thermal fluctuations. The magnetic storage apparatus has a longitudinal magnetic recording media including a magnetic layer which is formed on a substrate via a multi-layered underlayer; a driver for driving the recording media in a recording direction; a magnetic head including a recording section and a read-back section; a driver for moving the magnetic head relatively with respect to the longitudinal magnetic recording media; and a read/write signal processor for processing input signals to the magnetic head and output signal read-back therefrom. The read-back section of the magnetic head includes a magnetoresistive head. One layer of the multi-layered underlayer in the longitudinal magnetic recording media which is in contact with the magnetic layer has a substantially hexagonal close-packed (hcp) structure and has crystal grains whose c-axes are substantially parallel with the substrate plane.

摘要翻译： 磁记录装置在每平方英寸2吉比特或更高的记录密度下具有高可靠性。 实现该装置所需的纵向记录介质具有低介质噪声并且免受热波动的影响。 磁存储装置具有纵向磁记录介质，其包括通过多层底层形成在基板上的磁性层; 用于在记录方向上驱动记录介质的驱动器; 包括记录部分和回读部分的磁头; 用于相对于纵向磁记录介质移动磁头的驱动器; 以及用于处理对磁头的输入信号和从其读回的输出信号的读/写信号处理器。 磁头的回读部分包括磁阻头。 与磁性层接触的纵向磁记录介质中的多层底层的一层具有大致六边形密堆积（hcp）结构，并且具有c轴与基板平面基本平行的晶粒。

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：US06627255B2

公开(公告)日：2003-09-30

申请号：US10056088

申请日：2002-01-28

申请人： Nobuyuki Inaba ,  Tomoo Yamamoto ,  Teruaki Takeuchi ,  Masukazu Igarashi ,  Yoshio Takahashi

发明人： Nobuyuki Inaba ,  Tomoo Yamamoto ,  Teruaki Takeuchi ,  Masukazu Igarashi ,  Yoshio Takahashi

IPC分类号： B05D512

CPC分类号： G11B5/65 ,  G11B5/714

摘要： It is an object of the present invention to provide a magnetic recording medium which has a high level of magnetic antisotropy energy, retains stably the state of recording magnetization within the operating temperature range and is suitable for high-density recording with a low noise level, and a magnetic storage device for the magnetic recording medium. For attaining the above object, the magnetic recording film of the magnetic recording medium is characterized in that its magnetic anisotropy energy constant Ku at an absolute temperature of 300 K is greater than 3.6×106 erg/cc and the average particle diameter is larger than 5 nm and smaller than 12 nm.

摘要翻译： 本发明的目的是提供一种具有高水平的磁性反向能量的磁记录介质，将记录磁化的状态稳定地保持在工作温度范围内，并适用于具有低噪声水平的高密度记录， 以及用于磁记录介质的磁存储装置。 为了实现上述目的，磁记录介质的磁记录膜的特征在于其绝对温度为300K的磁各向异性能常数Ku大于3.6×10 6 / g / cc，平均粒径较大 超过5nm且小于12nm。

公开(公告)号：US06365287B1

公开(公告)日：2002-04-02

申请号：US09487172

申请日：2000-01-19

申请人： Nobuyuki Inaba ,  Tomoo Yamamoto ,  Teruaki Takeuchi ,  Masukazu Igarashi ,  Yoshio Takahashi

发明人： Nobuyuki Inaba ,  Tomoo Yamamoto ,  Teruaki Takeuchi ,  Masukazu Igarashi ,  Yoshio Takahashi

IPC分类号： G11B566

CPC分类号： G11B5/65 ,  G11B5/714

摘要： It is an object of the present invention to provide a magnetic recording medium which has a high level of magnetic anisotropy energy, retains stably the state of recording magnetization within the operating temperature range and is suitable for high-density recording with a low noise level, and a magnetic storage device for the magnetic recording medium. For attaining the above object, the magnetic recording film of the magnetic recording medium is characterized in that its magnetic anisotropy energy constant Ku at an absolute temperature of 300 K is greater than 3.6×106 erg/cc and the average particle diameter is larger than 5 nm and smaller than 12 nm.

摘要翻译： 本发明的目的是提供一种具有高水平的磁各向异性能的磁记录介质，将记录磁化的状态稳定地保持在工作温度范围内并且适合于具有低噪声水平的高密度记录， 以及用于磁记录介质的磁存储装置。 为了达到上述目的，磁记录介质的磁记录膜的特征在于其绝对温度为300K时的磁各向异性能常数Ku大于3.6×10 6 erg / cc，平均粒径大于5nm 并小于12nm。

公开(公告)号：US06456448B1

公开(公告)日：2002-09-24

申请号：US09435036

申请日：1999-11-05

申请人： Fumiko Akagi ,  Masukazu Igarashi ,  Kazuetsu Yoshida ,  Akira Ishikawa

发明人： Fumiko Akagi ,  Masukazu Igarashi ,  Kazuetsu Yoshida ,  Akira Ishikawa

IPC分类号： G11B502

CPC分类号： G11B5/012 ,  G11B5/64 ,  G11B5/82 ,  G11B2005/001

摘要： A magnetic recording system which can suppress an influence by a thermal fluctuation and is suitable for the high density magnetic recording in which excellent S/N ratio and resolution are obtained is provided. There is provided a magnetic recording system constructed by: a magnetic recording medium having a magnetic layer formed on a substrate through an underlayer; a driving unit for driving the medium in the recording direction; a magnetic head constructed by a recording unit and a reproducing unit; an apparatus for relatively moving the magnetic head to the magnetic recording medium; and a recording reproduction signal processing apparatus for performing a signal input to the magnetic head and an output signal reproduction from the magnetic head, wherein the reproducing unit of the magnetic head is constructed by a magneto-resistance effect type head and the system has a recording magnetization pattern in which a magnetization transition length of the magnetic recording medium is equal to 70 nm or less, the direction of an axis of easy magnetization of the magnetic particles in the magnetic layer of the magnetic recording medium is three-dimensionally oriented. Even after the elapse of 100 hours after the recording and at a linear recording density of 360 kfci, a reproduction output hardly decreases. A degree of deterioration of the S/N ratio of the output to the noises and the resolution are smaller than that of the conventional system.

摘要翻译： 能够抑制热波动的影响的磁记录系统，适用于获得优异的S / N比和分辨率的高密度磁记录。 提供一种磁记录系统，其通过以下方式构成：磁记录介质，其具有通过底层在基板上形成的磁性层; 用于在记录方向上驱动介质的驱动单元; 由记录单元和再现单元构成的磁头; 用于将磁头相对移动到磁记录介质的装置; 以及用于执行向磁头输入的信号和从磁头再现的输出信号的记录再现信号处理装置，其中磁头的再现单元由磁阻效应型磁头构成，并且系统具有记录 磁记录介质的磁化转变长度等于或小于70nm的磁化模式，磁记录介质的磁性层中的磁性颗粒容易磁化的轴的方向是三维取向的。 即使在记录100小时后，线性记录密度为360kfci，再现输出几乎不降低。 输出与噪声的S / N比和分辨率的劣化程度小于常规系统的劣化程度。