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：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：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：US5650889A

公开(公告)日：1997-07-22

申请号：US380792

申请日：1995-01-30

申请人： Tomoo Yamamoto ,  Yuzuru Hosoe ,  Emi Mangyo ,  Masaaki Futamoto ,  Nobuyuki Inaba

发明人： Tomoo Yamamoto ,  Yuzuru Hosoe ,  Emi Mangyo ,  Masaaki Futamoto ,  Nobuyuki Inaba

IPC分类号： G11B5/012 ,  G11B5/64 ,  G11B5/82

CPC分类号： G11B5/656 ,  G11B5/012

摘要： A magnetic recording medium having a high coercivity and a high S/N ratio for high-density operation can include either a conductive or a nonconductive substrate. If the substrate is nonconductive, a conducting precoat layer is formed over the substrate. Further, an underlayer may be provided, over which a magnetic layer is formed by a bias sputtering method. The bias sputtering method may use Kr, Xe or Rn as a sputter gas, and employs a negative bias voltage. The magnetic recording medium has a product of remanent magnetization and magnetic layer thickness of 10-150 G.multidot..mu.m and a coercivity of 1600-4000 Oe. In combination with this magnetic recording medium, a large-capacity magnetic recording system has a write head that uses a magnetic material having a saturation magnetic flux density of more than 1.2 T in at least a part of the magnetic core; a read head utilizing the giant magnetoresistance effect; a signal processing circuit that utilizes maximum likelihood decoding; and circuits that correct for asymmetry of the reproduced signals from the magnetoresistive head. In addition, the flying height of the magnetic head slider is set to less than 0.05 .mu.m.

摘要翻译： 具有高矫顽力和高S / N比的用于高密度操作的磁记录介质可以包括导电或非导电衬底。 如果衬底不导电，则在衬底上形成导电预涂层。 此外，可以设置底层，通过偏置溅射法在其上形成磁性层。 偏置溅射法可以使用Kr，Xe或Rn作为溅射气体，并采用负偏置电压。 磁记录介质具有10-150Gxμm的剩余磁化和磁性层厚度的产物，矫顽力为1600-4000Oe。 与该磁记录介质相结合，大容量磁记录系统具有在至少一部分磁芯中使用饱和磁通密度大于1.2T的磁性材料的写头; 利用巨磁电阻效应的读头; 利用最大似然解码的信号处理电路; 以及校正来自磁阻头的再现信号的不对称性的电路。 此外，磁头滑块的飞行高度设定为小于0.05μm。

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：US06893746B1

公开(公告)日：2005-05-17

申请号：US10111608

申请日：2000-10-30

申请人： Fumiyoshi Kirino ,  Norio Ohta ,  Kouichirou Wakabayashi ,  Teruaki Takeuchi ,  Harumi Hieida ,  Masaki Sekine ,  Hiroyuki Awano ,  Akira Yano ,  Satoshi Matsunuma ,  Nobuyuki Inaba ,  Tetsunori Koda

发明人： Fumiyoshi Kirino ,  Norio Ohta ,  Kouichirou Wakabayashi ,  Teruaki Takeuchi ,  Harumi Hieida ,  Masaki Sekine ,  Hiroyuki Awano ,  Akira Yano ,  Satoshi Matsunuma ,  Nobuyuki Inaba ,  Tetsunori Koda

IPC分类号： G11B5/00 ,  G11B5/64 ,  G11B5/66 ,  G11B5/74 ,  G11B5/82 ,  G11B5/70 ,  G11B11/105

CPC分类号： G11B5/65 ,  G11B5/00 ,  G11B5/656 ,  G11B5/66 ,  G11B5/667 ,  G11B5/7325 ,  G11B5/74 ,  G11B5/82 ,  G11B2005/0002 ,  G11B2005/0005 ,  G11B2005/0021

摘要： A magnetic recording medium comprises an information-recording film and a ferromagnetic film on a substrate. The information-recording film is composed of, for example, an amorphous ferrimagnetic material having perpendicular magnetization. Further, the ferromagnetic film is composed of a magnetic material which has saturation magnetization larger than that of the information-recording film. Accordingly, the leak magnetic flux from the ferromagnetic film is larger than that from the information-recording film. The magnetic recording medium and a magnetic recording apparatus are obtained, which are excellent in thermal stability and which are preferred to perform super high density recording.

摘要翻译： 磁记录介质包括在基板上的信息记录膜和铁磁膜。 信息记录膜由例如具有垂直磁化的非晶铁磁材料构成。 此外，铁磁膜由具有比信息记录膜的饱和磁化强度大的饱和磁化强度的磁性材料构成。 因此，来自铁磁膜的泄漏磁通量大于来自信息记录膜的漏磁通量。 获得磁性记录介质和磁记录装置，其热稳定性优异，并且优选进行超高密度记录。

公开(公告)号：US06863998B2

公开(公告)日：2005-03-08

申请号：US10307301

申请日：2002-12-02

申请人： Tetsunori Koda ,  Nobuyuki Inaba ,  Hideaki Yamanaka ,  Enji Fujita ,  Satoshi Matsunuma

发明人： Tetsunori Koda ,  Nobuyuki Inaba ,  Hideaki Yamanaka ,  Enji Fujita ,  Satoshi Matsunuma

IPC分类号： G11B5/64 ,  G11B5/65 ,  G11B5/667 ,  G11B5/73 ,  G11B5/738 ,  G11B5/851 ,  H01F10/16 ,  G11B5/66 ,  G11B5/70

CPC分类号： G11B5/667 ,  G11B5/653 ,  G11B5/7325 ,  G11B5/851 ,  Y10S428/90

摘要： A magnetic recording medium 100 comprises, on a substrate 1, a first orientation control layer 2, a second orientation control layer 4, a soft magnetic layer 6, a non-magnetic layer 8, a recording layer 12, and a carbon protective layer 14. The recording layer 12 is formed of an FePt ordered alloy phase which exhibits ferromagnetism and an FePt3 ordered alloy phase which exhibits paramagnetism. Accordingly, the magnetic coupling force, which acts between those of the FePt ordered alloy phase, is broken by the paramagnetic FePt3 ordered alloy phase. The magnetic interaction between those of the FePt ordered alloy phase is reduced, and thus the noise is reduced. Further, the high density recording can be performed, and the medium is excellent in thermal stability, because the FePt ordered alloy having high crystalline magnetic anisotropy is used for the recording layer 12.

摘要翻译： 磁记录介质100在基板1上包括第一取向控制层2，第二取向控制层4，软磁层6，非磁性层8，记录层12和碳保护层14 记录层12由显示铁磁性的FePt有序合金相和显示顺磁性的FePt 3有序合金相形成。 因此，作用于FePt有序合金相的磁耦合力被顺磁性FePt3有序合金相破坏。 FePt有序合金相的磁相互作用减小，噪声降低。 此外，可以进行高密度记录，并且由于具有高结晶磁各向异性的FePt有序合金用于记录层12，介质的热稳定性优异。

公开(公告)号：US06846583B2

公开(公告)日：2005-01-25

申请号：US10356465

申请日：2003-02-03

申请人： Nobuyuki Inaba ,  Tetsunori Kouda ,  Hideaki Yamanaka ,  Satoshi Matsunuma ,  Enji Fujita

发明人： Nobuyuki Inaba ,  Tetsunori Kouda ,  Hideaki Yamanaka ,  Satoshi Matsunuma ,  Enji Fujita

IPC分类号： H05K5/02 ,  G11B5/64 ,  G11B5/65 ,  G11B5/667 ,  G11B5/73 ,  G11B5/851 ,  H05K5/03 ,  H05K7/18 ,  H05K7/20 ,  G11B5/66 ,  B32B15/00 ,  G11B5/70 ,  H01J1/00

CPC分类号： G11B5/667 ,  G11B5/65 ,  G11B5/656 ,  G11B5/7325 ,  G11B5/851 ,  Y10S428/90 ,  Y10T428/12465 ,  Y10T428/12854

摘要： A magnetic recording medium comprises a magnetic recording layer 63 which is formed by using an ordered alloy containing B on a substrate 1 containing an amorphous component. A part of B in the ordered alloy is segregated in a grain boundary, and thus the magnetic interaction, which acts between magnetic grains, can be reduced. Accordingly, it is possible to form fine and minute magnetic domains in the magnetic recording layer 63, and it is possible to reduce the medium noise as well. The temperature, at which the substrate is heated during the film formation of the magnetic recording layer 63, can be suppressed to be low, because the ordering temperature for the ordered alloy containing B is lower than those of ordered alloys not containing B. Therefore, it is possible to use a substrate made of glass which is suitable for the mass production. The magnetic recording layer 63 is also excellent in thermal stability because of the use of the ordered alloy having high magnetic anisotropy. According to the present invention, it is possible to provide the magnetic recording medium for high density recording which is excellent in thermal stability and which involves low medium noise.

摘要翻译： 磁记录介质包括磁记录层63，磁记录层63通过在含有非晶成分的基板1上使用含有B的有序合金而形成。 有序合金中的B的一部分在晶界中分离，因此可以减小在磁性颗粒之间作用的磁相互作用。 因此，可以在磁记录层63中形成精细和微小的磁畴，并且也可以降低介质噪声。 由于含有B的有序合金的有序温度低于不含B的有序合金的排序温度，所以在磁记录层63的成膜期间加热基板的温度可以被抑制得较低。因此， 可以使用适合于批量生产的玻璃制的基板。 由于使用具有高磁各向异性的有序合金，磁记录层63的热稳定性也优异。 根据本发明，可以提供热稳定性优异且介质噪音低的高密度记录用磁记录介质。

公开(公告)号：US06674594B1

公开(公告)日：2004-01-06

申请号：US10031338

申请日：2002-01-25

申请人： Kouichirou Wakabayashi ,  Teruaki Takeuchi ,  Nobuyuki Inaba

发明人： Kouichirou Wakabayashi ,  Teruaki Takeuchi ,  Nobuyuki Inaba

IPC分类号： G11B502

CPC分类号： G11B5/127 ,  G11B5/00 ,  G11B5/012 ,  G11B5/3103 ,  G11B5/3967 ,  G11B5/4886 ,  G11B5/596 ,  G11B5/59627 ,  G11B5/59655 ,  G11B5/59683 ,  G11B13/045 ,  G11B2005/0002 ,  G11B2005/0005 ,  G11B2005/0021

摘要： A magnetic recording apparatus includes a laser light source (132), a recording magnetic head (131) and a magnetoresistive element. The recording magnetic head includes a pair of magnetic poles (100 and 101), between which the magnetoresistive element is interposed. A rotary actuator (Sa) positions the recording magnetic head at a desired track of a magnetic recording medium. A laser beam can be radiated onto the magnetic recording medium to raise the temperature of a region (302) of the medium. This region has a width of the order of the track width. The raised temperature lowers the coercive force of this region, where a recording magnetic field can be applied for high density recording. The rotary actuator may form a yaw angle (&thgr;) with a track of the magnetic recording medium. Even in this case, the recording magnetic head (131) and the reproducing element have no tracking offset from the code track. In addition, if the size of the magnetic poles (100 and 101) of the recording magnetic head are set within a predetermined range, the region (302) heated by the laser beam does not deviate from a recording magnetic field application region (303).

摘要翻译： 磁记录装置包括激光源（132），记录磁头（131）和磁阻元件。 记录磁头包括一对磁极（100和101），磁阻元件插在其间。 旋转致动器（Sa）将记录磁头定位在磁记录介质的期望轨道处。 可以将激光束照射到磁记录介质上以升高介质的区域（302）的温度。 该区域具有轨道宽度顺序的宽度。 升高的温度降低了该区域的矫顽力，其中可以应用记录磁场用于高密度记录。 旋转致动器可以与磁记录介质的轨道形成偏航角（θ）。 即使在这种情况下，记录磁头（131）和再现元件也没有跟踪轨迹的跟踪偏移。 此外，如果将记录磁头的磁极（100和101）的尺寸设定在预定范围内，则由激光束加热的区域（302）不会偏离记录磁场施加区域（303） 。