公开(公告)号：US6014296A

公开(公告)日：2000-01-11

申请号：US681409

申请日：1996-07-23

申请人： Katsutaro Ichihara ,  Akira Kikitsu ,  Kohichi Tateyama

发明人： Katsutaro Ichihara ,  Akira Kikitsu ,  Kohichi Tateyama

IPC分类号： G11B5/00 ,  G11B5/012 ,  G11B5/39 ,  G11B5/40 ,  G11B5/55 ,  G11B5/596 ,  G11B5/82 ,  G11B23/00

CPC分类号： B82Y25/00 ,  B82Y10/00 ,  G11B5/012 ,  G11B5/3967 ,  G11B5/5526 ,  G11B5/743 ,  G11B5/82 ,  G11B2005/0002 ,  G11B2005/0018 ,  G11B2005/3996 ,  G11B5/40 ,  G11B5/59683

摘要： A magnetic disk including a substrate, a recording track section which is made of a magnetic member for recording and reproducing information magnetically and is provided on the substrate, and a guard band member which is provided between the recording track sections adjacent to each other so that they are substantially continued in a track direction and is harder than the magnetic member and is made of a non-magnetic material. Moreover, the magnetic member is not provided or magnetic members with a different thickness from the magnetic member forming the recording track section is provided on a lower area of the guard band member.

摘要翻译： 一种包括基板的磁盘，由用于磁性地记录和再现信息并设置在基板上的磁性部件制成的记录轨道部分，以及设置在彼此相邻的记录轨道部分之间的保护带部件，使得 它们在轨道方向上基本上继续并且比磁性构件更硬并且由非磁性材料制成。 另外，在保护带部件的下部区域不设置磁性部件，而是形成与形成记录轨道部分的磁性部件不同厚度的磁性部件。

公开(公告)号：US5780135A

公开(公告)日：1998-07-14

申请号：US712434

申请日：1996-09-11

申请人： Akira Kikitsu ,  Katsutaro Ichihara

发明人： Akira Kikitsu ,  Katsutaro Ichihara

IPC分类号： G11B5/64 ,  G11B5/72 ,  G11B5/66

CPC分类号： G11B5/656 ,  G11B5/72 ,  Y10T428/265

摘要： A magnetic disc apparatus includes a magnetic recording medium and member for recording/reproducing information in/out of the magnetic recording medium, the magnetic recording medium including a recording layer of a magnetic thin film formed on a non-magnetic substrate, and a non-magnetic protective layer formed on and thicker than the recording layer. The particular construction permits diminishing the thickness of the recording layer, making it possible to achieve a high density recording.

摘要翻译： 磁盘装置包括磁记录介质和用于在磁记录介质中记录/再现信息的构件，该磁记录介质包括形成在非磁性基板上的磁性薄膜的记录层， 磁性保护层形成在记录层上并且比记录层更厚。 具体的结构允许减小记录层的厚度，使得可以实现高密度记录。

公开(公告)号：US5652054A

公开(公告)日：1997-07-29

申请号：US500365

申请日：1995-07-10

申请人： Akira Kikitsu ,  Katsutaro Ichihara ,  Hitoshi Iwasaki ,  Atsuhito Sawabe

发明人： Akira Kikitsu ,  Katsutaro Ichihara ,  Hitoshi Iwasaki ,  Atsuhito Sawabe

IPC分类号： G11B5/64

CPC分类号： G11B5/653 ,  G11B5/656 ,  Y10S428/90 ,  Y10T428/256

摘要： This invention provides a magnetic recording medium having a magnetic thin film made of magnetic metal grains and a nonmagnetic matrix, wherein the hardness of the nonmagnetic matrix is larger than that of the magnetic metal grains, the magnetic metal grains have shape magnetic anisotropy and magneto-crystalline anisotropy, and in the nonmagnetic matrix the content of a magnetic metal element in a central portion between the magnetic metal grains is 20 atomic % or less. This invention also provides a magnetic recording/reproduction apparatus including a magnetic recording medium consisting of a nonmagnetic matrix, which is continuously present in the direction of film thickness and the in-plane direction of a magnetic thin film, and magnetic metal grains held in the nonmagnetic matrix, and a magnetic head for reproducing a signal from the magnetic recording medium by using a resistance change caused by a magnetic field.

摘要翻译： 本发明提供一种具有由磁性金属颗粒和非磁性基体制成的磁性薄膜的磁记录介质，其中非磁性基体的硬度大于磁性金属颗粒的硬度，磁性金属颗粒具有磁各向异性和磁 - 晶体各向异性，在非磁性基体中，磁性金属颗粒之间的中心部分的磁性金属元素的含量为20原子％以下。 本发明还提供一种磁记录/再现装置，其包括磁性记录介质，该磁记录介质由薄膜厚度方向和磁性薄膜的面内方向连续存在的非磁性矩阵组成，并且磁性金属颗粒保持在 非磁性矩阵，以及用于通过使用由磁场引起的电阻变化来再现来自磁记录介质的信号的磁头。

公开(公告)号：US06493164B1

公开(公告)日：2002-12-10

申请号：US09525047

申请日：2000-03-14

申请人： Akira Kikitsu ,  Katsutaro Ichihara

发明人： Akira Kikitsu ,  Katsutaro Ichihara

IPC分类号： G11B564

CPC分类号： G11B5/00 ,  G11B13/045 ,  G11B2005/0021

摘要： A magnetic recording apparatus having a magnetic recording medium having a recording layer formed on a substrate, the recording layer being constituted by magnetic grains and a nonmagnetic material formed between the magnetic grains, a heating unit configured to heat the recording layer, and a magnetic recording unit configured to apply a magnetic field to the recording layer. The magnetic recording medium, the heating unit and the magnetic recording unit are constituted so as to meet the following relationship: T/RKu(T)

摘要翻译： 一种具有磁记录介质的磁记录装置，具有形成在基板上的记录层，记录层由磁性颗粒和形成在磁性颗粒之间的非磁性材料构成，加热单元被配置为加热记录层，并且磁记录 被配置为向记录层施加磁场的单元。 磁记录介质，加热单元和磁记录单元构成为满足以下关系：其中，设Ku（T）为记录层的温度T的磁各向异性能量密度，Ku（Ta ）是在环境温度下，RKu（T）表示Ku（T）/ Ku（Ta）的比率，t表示磁场施加完成后的经过时间。

公开(公告)号：US06602620B1

公开(公告)日：2003-08-05

申请号：US09472250

申请日：1999-12-27

申请人： Akira Kikitsu ,  Katsutaro Ichihara

发明人： Akira Kikitsu ,  Katsutaro Ichihara

IPC分类号： G11B566

CPC分类号： G11B5/7325 ,  G11B5/738 ,  G11B5/746 ,  G11B5/855 ,  Y10S428/90

摘要： A magnetic recording medium comprising a magnetic recording layer formed on a substrate, in which information is recorded by forming recording cells in recording tracks formed on a surface of the magnetic recording layer, wherein the magnetic recording layer has a structure that magnetic particles are formed in a non-magnetic matrix and ordered particle domains in which magnetic particles are arrayed regularly are formed on a surface thereof, and wherein a size in a track width direction of each ordered particle domain is one fifth or more of a width of the recording track formed on the recording layer.

摘要翻译： 一种磁记录介质，包括形成在基板上的磁记录层，其中通过在磁记录层的表面上形成的记录轨道中形成记录单元来记录信息，其中磁记录层具有形成磁性颗粒的结构 在其表面上形成磁性粒子规则排列的非磁矩阵和有序粒子畴，其中，每个有序粒子畴的轨道宽度方向上的尺寸是形成的记录轨道的宽度的五分之一或更多 在录音层。

公开(公告)号：US06240060B1

公开(公告)日：2001-05-29

申请号：US09395573

申请日：1999-09-14

申请人： Akira Kikitsu ,  Sumio Ashida ,  Keiichiro Yusu ,  Katsutaro Ichihara

发明人： Akira Kikitsu ,  Sumio Ashida ,  Keiichiro Yusu ,  Katsutaro Ichihara

IPC分类号： G11B724

CPC分类号： G11B7/257 ,  G11B7/007 ,  G11B7/00718 ,  G11B7/00745 ,  G11B7/24 ,  G11B7/243 ,  G11B7/2542 ,  G11B7/2585 ,  G11B7/2595 ,  G11B2007/24312 ,  G11B2007/24314 ,  G11B2007/24316

摘要： A phase change recording medium comprises a substrate, an interference layer formed on the substrate and a recording layer formed on the interference layer. In this, the reflectance of the crystalline region in the recording layer is lower than that of amorphous region therein, and the interference layer comprises at least three layers of which the dielectric constant differs from that of the adjacent layers. With that constitution, the optical characteristics and the thermal characteristics of the medium are all optimized.

摘要翻译： 相变记录介质包括基板，形成在基板上的干涉层和形成在干涉层上的记录层。 在此，记录层中的结晶区域的反射率低于其中的非晶区域的反射率，并且干涉层包括介电常数与相邻层的介电常数不同的至少三层。 利用该结构，介质的光学特性和热特性都被优化。

公开(公告)号：US5981054A

公开(公告)日：1999-11-09

申请号：US897677

申请日：1997-07-21

申请人： Takashi Hikosaka ,  Tsutomu Tanaka ,  Yoichiro Tanaka ,  Katsutaro Ichihara ,  Keiichiro Yusu ,  Akira Kikitsu

发明人： Takashi Hikosaka ,  Tsutomu Tanaka ,  Yoichiro Tanaka ,  Katsutaro Ichihara ,  Keiichiro Yusu ,  Akira Kikitsu

IPC分类号： G11B5/64 ,  G11B5/855 ,  G11B5/66

CPC分类号： G11B5/65 ,  G11B5/64 ,  G11B5/656 ,  G11B5/855 ,  Y10S428/90 ,  Y10T428/256 ,  Y10T428/2991

摘要： A magnetic recording medium comprising a substrate and a magnetic film formed on the substrate, the magnetic film including magnetic crystal grains in a non-magnetic matrix and satisfying the condition given below:d.sup.2 .multidot.t.multidot.Ir/(v.multidot.Isb).gtoreq.0.75wheret: a thickness of the magnetic film;Ir: a remanent magnetization moment of the magnetic film;d: an average particle size of the magnetic crystal grains in an intra-film direction of the magnetic film; andv.multidot.Isb: an activated magnetization moment of the magnetic film.

摘要翻译： 一种磁性记录介质，包括在基板上形成的基板和磁性膜，该磁性膜包括非磁性矩阵中的磁性晶粒并且满足以下条件：d2xtxIr /（vxIsb）> / = 0.75其中t：厚度 的磁膜; Ir：磁膜的剩磁化力矩; d：磁性膜的膜内方向的磁性晶粒的平均粒径; 和vxIsb：磁膜的激活的磁化力矩。

公开(公告)号：US5412627A

公开(公告)日：1995-05-02

申请号：US61538

申请日：1993-05-14

申请人： Katsutaro Ichihara ,  Sumio Ashida ,  Akira Kikitsu ,  Yumi Mizusawa

发明人： Katsutaro Ichihara ,  Sumio Ashida ,  Akira Kikitsu ,  Yumi Mizusawa

IPC分类号： G11B11/10 ,  G11B11/105 ,  G11B13/04

CPC分类号： G11B11/10521 ,  G11B11/10586

摘要： Light beams having two different power levels are radiated on a magneto-optical medium having a recording layer and a bias layer magnetostatically coupled to the recording layer, thereby recording and erasing information. Upon radiation of a high level beam, a beam irradiated portion of the recording layer is heated to reach a magnetization reversal temperature, and the direction of magnetization of the irradiated portion follows a direction of a leakage field generated by a magnetization distribution formed by heating of the bias layer. Upon radiation of a low level beam, a beam irradiated portion of the recording layer is heated to reach a magnetization reversal temperature to cause the bias layer to generate a leakage field having a magnitude smaller than that upon radiation of the high level beam. In this case, the direction of magnetization of the recording layer is opposite to that of the leakage field obtained upon radiation of the high level beam. The directions of magnetization of the bias layer are kept unchanged before and after the radiation of the high level beam and before and after the radiation of the low level beam.

摘要翻译： 具有两个不同功率电平的光束被辐射在具有静磁耦合到记录层的记录层和偏置层的磁光介质上，从而记录和擦除信息。 在高电平光束的辐射下，记录层的光束照射部分被加热以达到磁化反转温度，并且照射部分的磁化方向遵循由通过加热形成的磁化分布产生的泄漏场的方向 偏置层。 在低电平光束的辐射下，记录层的光束照射部分被加热以达到磁化反转温度，以使偏置层产生的幅度小于高电平光束辐射时的泄漏场。 在这种情况下，记录层的磁化方向与在高电平光束的辐射时获得的泄漏场的方向相反。 在高电平光束的辐射之前和之后以及在低电平光束的辐射之前和之后，偏置层的磁化方向保持不变。

公开(公告)号：US07494725B2

公开(公告)日：2009-02-24

申请号：US11085622

申请日：2005-03-22

申请人： Tomoyuki Maeda ,  Akira Kikitsu ,  Soichi Oikawa ,  Takeshi Iwasaki

发明人： Tomoyuki Maeda ,  Akira Kikitsu ,  Soichi Oikawa ,  Takeshi Iwasaki

IPC分类号： G11B5/66

CPC分类号： G11B5/667 ,  G11B5/65 ,  G11B5/7325

摘要： A grain diameter controlling crystalline layer comprising crystalline grains of a metal selected from the group consisting essentially of Cu, Ni, Rh and Pt was formed on a substrate. Then, deposited atom layer of at least one element selected from the group consisting of oxygen and carbon was formed on the surface of the grain diameter control layer. A magnetic recording layer was deposited on the atoms deposited grain diameter controlling crystalline layer. Then a magnetic recording medium in which the magnetic crystalline grains has small grain diameter and small grain diameter distribution, and the magnetic recording medium shows increased signal to noise ratio at high recording density.

摘要翻译： 在基板上形成包含选自Cu，Ni，Rh和Pt中的金属的晶粒的晶粒直径控制晶体层。 然后，在粒径控制层的表面上形成从由氧和碳组成的组中选出的至少一种元素的沉积原子层。 在原子沉积粒径控制晶体层上沉积磁记录层。 然后是其中磁晶粒具有小的粒径和小的粒径分布的磁记录介质，并且磁记录介质在高记录密度下显示增加的信噪比。

公开(公告)号：US20080090002A1

公开(公告)日：2008-04-17

申请号：US11873860

申请日：2007-10-17

申请人： Tomoyuki Maeda ,  Akira Kikitsu ,  Soichi Oikawa ,  Takeshi Iwasaki

发明人： Tomoyuki Maeda ,  Akira Kikitsu ,  Soichi Oikawa ,  Takeshi Iwasaki

IPC分类号： G11B5/84

CPC分类号： G11B5/667 ,  G11B5/65 ,  G11B5/7325

摘要： A magnetic recording layer is formed on an under-layer comprising a Cu crystalline grain layer and a deposited nitrogen atom layer on the Cu crystalline grain layer surface. Then the magnetic recording layer comprising very small average grain diameter and sharp grain diameter distribution is obtained. The magnetic recording medium comprising the magnetic recording layer shows excellent signal to noise ratio at high density recording.

摘要翻译： 在Cu晶粒层表面上的包含Cu晶粒层和沉积的氮原子层的下层上形成磁记录层。 然后获得包含非常小的平均粒径和尖锐的粒径分布的磁记录层。 包括磁记录层的磁记录介质在高密度记录时显示出优异的信噪比。