公开(公告)号：US5723198A

公开(公告)日：1998-03-03

申请号：US258923

申请日：1994-06-13

Applicant: Yuzuru Hosoe ,  Yoshihiro Shiroishi ,  Akira Ishikawa ,  Futoshi Tomiyama ,  Kazuetsu Yoshida ,  Tomoo Yamamoto ,  Yotsuo Yahisa ,  Akira Osaki ,  Katsuo Abe ,  Shinji Narishige ,  Naoki Kodama ,  Kiwamu Tanahashi ,  Emi Mangyo

Inventor： Yuzuru Hosoe ,  Yoshihiro Shiroishi ,  Akira Ishikawa ,  Futoshi Tomiyama ,  Kazuetsu Yoshida ,  Tomoo Yamamoto ,  Yotsuo Yahisa ,  Akira Osaki ,  Katsuo Abe ,  Shinji Narishige ,  Naoki Kodama ,  Kiwamu Tanahashi ,  Emi Mangyo

IPC: G11B5/66

CPC classification number: G11B5/66 ,  Y10S428/90 ,  Y10T428/24355 ,  Y10T428/24942 ,  Y10T428/265

Abstract: In a magnetic recording system including magnetic recording media, a rotation driving unit for driving these magnetic recording media, read/write magnetic heads, driving apparatus for driving these read/write magnetic heads, and a read/write signal processing apparatus, a reading portion of the respective magnetic heads is arranged by a magnetoresistive head. The magnetic recording media are constructed of multi-layered magnetic media having a plurality of magnetic layers fabricated directly, or via underlayers on a non-magnetic disk substrate, and of non-magnetic intermediate layers arranged among these non-magnetic layers. Furthermore, one coercivity which is measured by applying a magnetic field along a circumferential direction of the magnetic recording media, is selected to be larger than the other coercivity which is measured by applying a magnetic field along a radial direction of the magnetic recording media, so that a higher signal-to-noise ratio is achieved, as compared with that of the conventional magnetic recording system. Since the thickness of the non-magnetic intermediate layers is smaller than or equal to 5 nm, and also the total layer is smaller than or equal to 5 nm, and also the total layer number of the plural magnetic layers is selected to be odd, better characteristics can be achieved. Accordingly, since the MTBF (Mean Time Before Failure) is longer than or equal to 0.15 million hours with high recording density, and the disk substrate and the magnetic head sliders can be mounted at high packaging density, a compact and high-capacity magnetic recording system can be obtained.

Abstract translation: 在包括磁记录介质的磁记录系统中，用于驱动这些磁记录介质的旋转驱动单元，读/写磁头，用于驱动这些读/写磁头的驱动装置以及读/写信号处理装置，读/ 相应的磁头由磁阻头安排。 磁记录介质由具有直接制造的多个磁性层或通过非磁盘基板上的底层以及布置在这些非磁性层之间的非磁性中间层的多层磁性介质构成。 此外，通过沿着磁记录介质的圆周方向施加磁场来测量的一个矫顽力被选择为大于通过沿着磁记录介质的径向方向施加磁场而测量的其他矫顽力，因此， 与常规磁记录系统相比，实现了更高的信噪比。 由于非磁性中间层的厚度小于或等于5nm，并且总层小于或等于5nm，并且多个磁性层的总层数也被选择为奇数， 可以实现更好的特性。 因此，由于MTBF（平均故障间隔时间）长于或等于0.15万小时，具有高记录密度，并且盘基板和磁头滑块可以以高封装密度安装，紧凑且高容量的磁记录 系统可以得到。

公开(公告)号：US4174373A

公开(公告)日：1979-11-13

申请号：US609081

申请日：1975-08-29

Applicant: Kazuetsu Yoshida ,  Michiharu Seki ,  Keiichi Kanehori ,  Katsuhiro Kaneko ,  Yo Sakurai

Inventor： Kazuetsu Yoshida ,  Michiharu Seki ,  Keiichi Kanehori ,  Katsuhiro Kaneko ,  Yo Sakurai

IPC: B01D53/60 ,  B01D53/74 ,  B01J21/18 ,  B01J23/10 ,  B01J23/16 ,  B01J23/70 ,  B01J27/00 ,  C01C1/242 ,  B01D53/34

CPC classification number: B01D53/60

Abstract: A catalyst comprising carbonaceous materials such as activated carbon, etc. impregnated with bromine, iodine, chlorine or their compounds, is impregnated with a promoter containing a specific metal, and brought in contact with a flue gas in the presence of ammonia, whereby nitrogen oxides and sulfur oxides contained in the flue gas are removed with a very high percent removal. The removal can be carried out at a temperature much lower than that of the conventional process.

Abstract translation: 含有用溴，碘，氯或其化合物浸渍的碳质材料如活性炭等的催化剂用含有特定金属的助催化剂浸渍，并在氨的存在下与烟气接触，由此氮氧化物 并且以非常高的百分比去除除去烟道气中所含的硫氧化物。 去除可以在比常规方法低得多的温度下进行。

公开(公告)号：US06403203B2

公开(公告)日：2002-06-11

申请号：US09379462

申请日：1999-08-24

Applicant: Masaaki Futamoto ,  Nobuyuki Inaba ,  Yoshiyuki Hirayama ,  Yukio Honda ,  Kazuetsu Yoshida ,  Kenya Ito

Inventor： Masaaki Futamoto ,  Nobuyuki Inaba ,  Yoshiyuki Hirayama ,  Yukio Honda ,  Kazuetsu Yoshida ,  Kenya Ito

IPC: G11B5667

CPC classification number: H04B10/504 ,  G11B5/66 ,  Y10S428/90 ,  Y10T428/12465 ,  Y10T428/12861 ,  Y10T428/12875 ,  Y10T428/24942 ,  Y10T428/2495 ,  Y10T428/24975 ,  Y10T428/26 ,  Y10T428/265

Abstract: Magnetic recording medium includes at least two layers having different magnetic anisotropy constants formed on a substrate and the perpendicular magnetic anisotropy of the second magnetic film of those magnetic films, far from the substrate surface, made equal to or larger than that of the first magnetic film near to the substrate surface, thus improving the magnetic isolation of the first magnetic film near to the substrate surface.

Abstract translation: 磁记录介质包括形成于基板上的至少两层不同的磁各向异性常数，并且远离基板表面的这些磁性膜的第二磁性膜的垂直磁各向异性等于或大于第一磁性膜 靠近基板表面，从而改善靠近基板表面的第一磁性膜的磁隔离。

公开(公告)号：US06349008B1

公开(公告)日：2002-02-19

申请号：US09176114

申请日：1998-10-21

Applicant: Takanobu Takayama ,  Kiwamu Tanahashi ,  Kazuetsu Yoshida ,  Mikio Suzuki ,  Yoshiyuki Hirayama ,  Masaaki Futamoto ,  Yohji Maruyama

Inventor： Takanobu Takayama ,  Kiwamu Tanahashi ,  Kazuetsu Yoshida ,  Mikio Suzuki ,  Yoshiyuki Hirayama ,  Masaaki Futamoto ,  Yohji Maruyama

IPC: G11B502

CPC classification number: G11B5/656 ,  G11B5/012 ,  G11B5/1278 ,  G11B5/62 ,  G11B5/82

Abstract: A magnetic recording medium wherein, when the axis of easy magnetization of the magnetic recording medium for magnetically recording information by means of a magnetic head is projected onto a surface of the magnetic recording medium, the axis projected onto the surface of the magnetic recording medium exists so as to be unidirectionally inclined with respect to the direction of a track on which information is to be recorded, whereby, by using the magnetic recording medium, there can be provided a magnetic head and a magnetic read-write apparatus greatly improved in longitudinal recording density.

Abstract translation: 一种磁记录介质，其中当用于通过磁头磁信息记录的磁记录介质的易磁化轴被投影到磁记录介质的表面上时，投射到磁记录介质的表面上的轴存在 相对于要记录信息的轨道的方向是单向倾斜的，由此通过使用磁记录介质，可以提供在纵向记录中大大改进的磁头和磁读写装置 密度。

公开(公告)号：US06183893B2

公开(公告)日：2001-02-06

申请号：US09285751

申请日：1999-04-05

Applicant: Masaaki Futamoto ,  Yoshiyuki Hirayama ,  Kenya Ito ,  Kazuetsu Yoshida ,  Yukio Honda ,  Nobuyuki Inaba

Inventor： Masaaki Futamoto ,  Yoshiyuki Hirayama ,  Kenya Ito ,  Kazuetsu Yoshida ,  Yukio Honda ,  Nobuyuki Inaba

IPC: B32B1500

CPC classification number: G11B5/7325 ,  G11B5/00 ,  G11B5/012 ,  G11B5/66 ,  G11B2005/0029 ,  Y10S428/90 ,  Y10S428/928 ,  Y10T428/12861 ,  Y10T428/12875 ,  Y10T428/265

Abstract: The present invention relates to a perpendicular magnetic recording medium and a magnetic storage apparatus which are improved to be suitable for high-density magnetic recording. An object thereof is to provide the perpendicular magnetic recording medium and the magnetic storage apparatus which have a low noise property for realizing a recording density of 10 Gb/in.2 or more and a high stability against thermal fluctuation. The perpendicular magnetic recording medium comprising a perpendicular magnetic film formed through an underlayer on a nonmagnetic substrate, wherein the underlayer comprises a material having a hexagonal close packed structure or an amorphous structure, and has a first underlayer nearer to the substrate, and a second underlayer having a hexagonal close packed structure formed on the first underlayer and a preferred growth orientation of [0001] and comprising a material capable of hetero-epitaxy growth onto the perpendicular magnetic film.

Abstract translation: 本发明涉及一种改进为适合于高密度磁记录的垂直磁记录介质和磁存储装置。 其目的是提供具有低噪声特性的垂直磁记录介质和磁存储装置，以实现10Gb / in.2以上的记录密度和对热波动的高稳定性。垂直磁记录介质包括 在非磁性基板上通过下层形成的垂直磁性膜，其中，所述下层包括具有六方密堆积结构或非晶结构的材料，并且具有更靠近所述基板的第一底层和具有六方密堆积结构的第二底层 形成在第一底层上，并且具有优选的生长方向，并且包括能够在垂直磁性膜上进行异质外延生长的材料。

公开(公告)号：US07399540B2

公开(公告)日：2008-07-15

申请号：US11582327

申请日：2006-10-18

Applicant: Masaaki Futamoto ,  Kazuetsu Yoshida ,  Yukio Honda ,  Yoshiyuki Hirayama ,  Atsushi Kikugawa

Inventor： Masaaki Futamoto ,  Kazuetsu Yoshida ,  Yukio Honda ,  Yoshiyuki Hirayama ,  Atsushi Kikugawa

IPC: G11B5/66

CPC classification number: G11B5/667 ,  G11B5/64 ,  G11B5/66 ,  Y10S428/90 ,  Y10T428/265

Abstract: A perpendicular magnetic recording medium which has been improved to be suitable for high-density magnetic recording and a magnetic recording apparatus using the medium are provided. The magnetic back film of a dual-layer perpendicular recording medium is caused to be constituted by a plurality of layers, and a keeper layer 17 for keeping perpendicular magnetization and layers 13 and 15 for improving the recording efficiency of a recording head are functionally separated from one another. Further, the magnetization orientations of the soft magnetic films excluding the keeper layer are defined to be in the circumferential direction of the disk, whereby the frequency of occurrence of noise is decreased.

Abstract translation: 提供了已经改进以适合于高密度磁记录的垂直磁记录介质和使用介质的磁记录装置。 使双层垂直记录介质的磁背膜由多层构成，用于保持垂直磁化的保持层17和用于提高记录头的记录效率的层13和15在功能上与 另一个。 此外，除了保持层之外的软磁性膜的磁化取向被限定在圆盘的圆周方向上，从而噪声的发生频率降低。

公开(公告)号：US20070037018A1

公开(公告)日：2007-02-15

申请号：US11582327

申请日：2006-10-18

Applicant: Masaaki Futamoto ,  Kazuetsu Yoshida ,  Yukio Honda ,  Yoshiyuki Hirayama ,  Atsushi Kikugawa

Inventor： Masaaki Futamoto ,  Kazuetsu Yoshida ,  Yukio Honda ,  Yoshiyuki Hirayama ,  Atsushi Kikugawa

IPC: G11B5/66

CPC classification number: G11B5/667 ,  G11B5/64 ,  G11B5/66 ,  Y10S428/90 ,  Y10T428/265

Abstract: A perpendicular magnetic recording medium which has been improved to be suitable for high-density magnetic recording and a magnetic recording apparatus using the medium are provided. The magnetic back film of a dual-layer perpendicular recording medium is caused to be constituted by a plurality of layers, and a keeper layer 17 for keeping perpendicular magnetization and layers 13 and 15 for improving the recording efficiency of a recording head are functionally separated from one another. Further, the magnetization orientations of the soft magnetic films excluding the keeper layer are defined to be in the circumferential direction of the disk, whereby the frequency of occurrence of noise is decreased.

Abstract translation: 提供了已经改进以适合于高密度磁记录的垂直磁记录介质和使用介质的磁记录装置。 使双层垂直记录介质的磁背膜由多层构成，用于保持垂直磁化的保持层17和用于提高记录头的记录效率的层13和15在功能上与 另一个。 此外，除了保持层之外的软磁性膜的磁化取向被限定在圆盘的圆周方向上，从而噪声的发生频率降低。

公开(公告)号：US07147941B2

公开(公告)日：2006-12-12

申请号：US10664870

申请日：2003-09-22

Applicant: Masaaki Futamoto ,  Kazuetsu Yoshida ,  Yukio Honda ,  Yoshiyuki Hirayama ,  Atsushi Kikugawa

Inventor： Masaaki Futamoto ,  Kazuetsu Yoshida ,  Yukio Honda ,  Yoshiyuki Hirayama ,  Atsushi Kikugawa

IPC: G11B5/66

CPC classification number: G11B5/667 ,  G11B5/64 ,  G11B5/66 ,  Y10S428/90 ,  Y10T428/265

Abstract: A perpendicular magnetic recording medium which has been improved to be suitable for high-density magnetic recording and a magnetic recording apparatus using the medium are provided. The magnetic back film of a dual-layer perpendicular recording medium is caused to be constituted by a plurality of layers, and a keeper layer 17 for keeping perpendicular magnetization and layers 13 and 15 for improving the recording efficiency of a recording head are functionally separated from one another. Further, the magnetization orientations of the soft magnetic films excluding the keeper layer are defined to be in the circumferential direction of the disk, whereby the frequency of occurrence of noise is decreased.

Abstract translation: 提供了已经改进以适合于高密度磁记录的垂直磁记录介质和使用介质的磁记录装置。 使双层垂直记录介质的磁背膜由多层构成，用于保持垂直磁化的保持层17和用于提高记录头的记录效率的层13和15在功能上与 另一个。 此外，除了保持层之外的软磁性膜的磁化取向被限定在圆盘的圆周方向上，从而噪声的发生频率降低。

公开(公告)号：US06778471B1

公开(公告)日：2004-08-17

申请号：US09604557

申请日：2000-06-27

Applicant: Kazuetsu Yoshida ,  Hiroaki Nemoto ,  Hideki Saga

Inventor： Kazuetsu Yoshida ,  Hiroaki Nemoto ,  Hideki Saga

IPC: G11B1100

CPC classification number: G11B5/00 ,  G11B5/09 ,  G11B2005/0002 ,  G11B2005/0005 ,  G11B2005/0016 ,  G11B2005/0021

Abstract: In an optical recording and magnetic-head reproducing system, the reproduced output is prevented from starting to decrease, upon the length of record bits getting shorter, in the range of the bit length larger than reproducing resolution of a magnetic reproducing head. When data are recorded magneto-optically on a magnetic recording medium, the radius of curvature of arcs constituting the boundary of recorded magnetic domains is made as large as possible so that the shape of the recorded spot may be substantially rectangular. As a result, it becomes possible to improve the efficiency of magnetic reproduction, and high-output as well as high-SN-ratio reproduction at high linear recording density can be achieved.

Abstract translation: 在光学记录和磁头再现系统中，在比特长度大于磁再现头的再现分辨率的范围内，在记录位长度越来越短的情况下，防止再现的输出开始减小。 当数据在磁记录介质上磁光记录时，构成记录磁畴的边界的弧的曲率半径尽可能大，使得记录点的形状可以是大致矩形。 结果，可以提高磁再现的效率，并且可以实现在高线性记录密度下的高输出以及高SN比再现。

公开(公告)号：US06641901B2

公开(公告)日：2003-11-04

申请号：US10340597

申请日：2003-01-13

Applicant: Kazuetsu Yoshida ,  Masaaki Futamoto ,  Yoshiyuki Hirayama

Inventor： Kazuetsu Yoshida ,  Masaaki Futamoto ,  Yoshiyuki Hirayama

IPC: H01F1000

CPC classification number: G11B5/66 ,  Y10T428/12861 ,  Y10T428/24942 ,  Y10T428/31678

Abstract: The present invention relates to perpendicular magnetic recording media using a ferromagnetic film provided with perpendicular magnetic anisotropy for a recording layer and a magnetic recording apparatus using the media, and the object is to provide the perpendicular magnetic recording media which are excellent in signal to noise ratio (S/N) in a large recording density region, which are stable against thermal fluctuation and which can be easily manufactured, and the magnetic recording apparatus using the media. The representative perpendicular magnetic recording media according to the invention include a glass substrate, a first recording layer which is provided on the substrate via an underlayer, which has perpendicular magnetic anisotropy and the magnitude of magnetic exchange interaction between grains of which is substantially zero and a second recording layer which is laminated on the first recording layer, which is provided with perpendicular magnetic anisotropy and the magnetic exchange interaction between grains of which is larger than that of the first recording layer.