公开(公告)号：US5147732A

公开(公告)日：1992-09-15

申请号：US412988

申请日：1989-09-26

申请人： Yoshihiro Shiroishi ,  Takeo Yamashita ,  Sadao Hishiyama ,  Noriyuki Kumasaka ,  Yoshibumi Matsuda ,  Hiroyuki Suzuki ,  Kazumasa Takagi ,  Norikazu Tsumita ,  Masaki Ohura ,  Tomoyuki Ohno

发明人： Yoshihiro Shiroishi ,  Takeo Yamashita ,  Sadao Hishiyama ,  Noriyuki Kumasaka ,  Yoshibumi Matsuda ,  Hiroyuki Suzuki ,  Kazumasa Takagi ,  Norikazu Tsumita ,  Masaki Ohura ,  Tomoyuki Ohno

IPC分类号： G11B5/64 ,  G11B5/66 ,  G11B11/105

CPC分类号： G11B5/65 ,  G11B11/10593 ,  G11B5/66 ,  Y10S428/90 ,  Y10S428/928 ,  Y10T428/12861

摘要： Disclosed are longitudinal recording media comprising a composite magnetic film formed on a nonmagnetic substrate directly or through a nonmagnetic underlayer, in which all of magnetic thin films constituting the composite magnetic film are magnetically connected, the composite magnetic film has a single in-plane coercivity, and the in-plane coercivity is greater than the in-plane coercivity of a longitudinal magnetically anisotropic magnetic thin film constituting a magnetic thin film nearest to an information recording side among the magnetic thin films constituting the composite film.

摘要翻译： 本发明公开了一种纵向记录介质，其包括直接或通过非磁性底层形成在非磁性基底上的复合磁性膜，其中构成复合磁性膜的所有磁性薄膜磁性连接，复合磁性膜具有单一的面内矫顽力， 并且面内矫顽力大于构成复合膜的磁性薄膜中构成最靠近信息记录侧的磁性薄膜的纵向磁各向异性磁性薄膜的面内矫顽力。

公开(公告)号：US4939045A

公开(公告)日：1990-07-03

申请号：US172194

申请日：1988-03-23

申请人： Kazuetsu Yoshida ,  Yoshihiro Shiroishi ,  Makoto Saito ,  Norikazu Tsumita ,  Takeo Yamashita ,  Hiroyuki Suzuki ,  Yasushi Kitazaki ,  Masaki Ohura ,  Sadao Hishiyama ,  Tomoyuki Ohno ,  Yoshibumi Matsuda ,  Kazumasa Takagi ,  Katsuhiro Kuroda ,  Sadanori Nagaike

发明人： Kazuetsu Yoshida ,  Yoshihiro Shiroishi ,  Makoto Saito ,  Norikazu Tsumita ,  Takeo Yamashita ,  Hiroyuki Suzuki ,  Yasushi Kitazaki ,  Masaki Ohura ,  Sadao Hishiyama ,  Tomoyuki Ohno ,  Yoshibumi Matsuda ,  Kazumasa Takagi ,  Katsuhiro Kuroda ,  Sadanori Nagaike

IPC分类号： G01R33/12 ,  G11B5/64

CPC分类号： G01R33/1207 ,  G11B5/64 ,  Y10S428/928 ,  Y10T428/12833 ,  Y10T428/12861

摘要： Disclosed are a magnetic recording medium having a magnetic recording layer formed of a magnetic thin film in which rotational hysteresis integral R.sub.H is within a range of from 0.4 to 1.3 in the measurement by a torque magnetometer, and a continuous magnetic recording medium in which crystal grains are substantially randomly arranged on the upper surface of a magnetic recording layer or on the surface of a non-magnetic subbing layer, and in which each of the crystal grains is made to be in the form of an ellipsoid or needle and to have a length-ways axial ratio of a major axis to a minor axis not smaller than 2, more preferably, not smaller than 4.

摘要翻译： 公开了一种磁记录介质，其具有由磁性薄膜形成的磁记录层，其中旋转磁滞积分RH在通过转矩磁力计的测量中在0.4至1.3的范围内，以及连续磁记录介质，其中晶粒 基本上随机地布置在磁记录层的上表面上或非磁性底层的表面上，并且其中每个晶粒被制成椭圆形或针状，并且具有长度 长轴与短轴的轴向比不小于2，更优选不小于4。

公开(公告)号：US4786553A

公开(公告)日：1988-11-22

申请号：US30600

申请日：1987-03-27

申请人： Yoshihiro Shiroishi ,  Sadao Hishiyama ,  Hiroyuki Suzuki ,  Norikazu Tsumita ,  Tsuneo Suganuma ,  Yoshio Gobara ,  Masaaki Hayashi ,  Makoto Sano ,  Takaaki Shirakura

发明人： Yoshihiro Shiroishi ,  Sadao Hishiyama ,  Hiroyuki Suzuki ,  Norikazu Tsumita ,  Tsuneo Suganuma ,  Yoshio Gobara ,  Masaaki Hayashi ,  Makoto Sano ,  Takaaki Shirakura

IPC分类号： G11B5/64 ,  H01F10/10 ,  H01F10/26

CPC分类号： G11B5/64 ,  Y10S428/90 ,  Y10T428/1266 ,  Y10T428/12854 ,  Y10T428/12944 ,  Y10T428/265

摘要： A magnetic recording medium comprises a non-magnetic substrate and a thin magnetic film, the thin magnetic film being composed mainly of Co, Ni and at least one of Zr and Hf, and a concentration of Zr, Hf or Zr and Hf as contained in the thin magnetic film being 0.1 to 30% by atom on the basis of the total of Co and Ni, and has a considerably higher corrosion resistance than that of the conventional magnetic recording medium having a thin Co-Ni magnetic film.

摘要翻译： 磁记录介质包括非磁性基片和薄磁膜，该薄磁膜主要由Co，Ni和Zr和Hf中的至少一种组成，Zr，Hf或Zr和Hf的浓度包含在 基于Co和Ni的总和，薄磁膜为0.1至30原子％，并且具有比具有薄Co-Ni磁性膜的常规磁记录介质更高的耐腐蚀性。

公开(公告)号：US4576876A

公开(公告)日：1986-03-18

申请号：US651937

申请日：1984-09-19

申请人： Kazuo Shiiki ,  Yoshihiro Shiroishi ,  Osamu Kitakami ,  Yasutaro Uesaka

发明人： Kazuo Shiiki ,  Yoshihiro Shiroishi ,  Osamu Kitakami ,  Yasutaro Uesaka

IPC分类号： G11B5/64 ,  G11B5/66 ,  G11B5/667 ,  G11B5/738 ,  G11B5/85 ,  G11B5/852 ,  H01F10/08 ,  H01F10/12 ,  H01F10/13

CPC分类号： G11B5/66 ,  G11B5/852 ,  Y10S428/90 ,  Y10T428/12937 ,  Y10T428/24942

摘要： A magnetic recording medium comprising a substrate, an underlayer provided on the substrate and having a high permeability magnetic film and a relative permeability in all directions in the film surface of not less than 800, and a recording medium layer provided on the underlayer and having a perpendicular anisotropy. The recording and reproduction characteristics of this magnetic recording medium do not vary even when the direction of movement thereof with respect to a magnetic head varies. When it is applied to a magnetic disc, preferable results can be obtained.

摘要翻译： 一种磁记录介质，其特征在于，包括基板，在所述基板上设置有高透磁性磁性膜和所述膜表面的相对磁导率为800以上的底层，以及设置在所述底层上的记录介质层， 垂直各向异性。 即使当磁记录介质相对于磁头的移动方向变化时，该磁记录介质的记录和再现特性也不变化。 当将其应用于磁盘时，可以获得优选的结果。

公开(公告)号：US06924048B2

公开(公告)日：2005-08-02

申请号：US10413481

申请日：2003-04-15

申请人： Tetsuya Kanbe ,  Yuzuru Hosoe ,  Ichiro Tamai ,  Yoshio Takahashi ,  Kiwamu Tanahashi ,  Satoshi Matsunuma ,  Yoshihiro Shiroishi

发明人： Tetsuya Kanbe ,  Yuzuru Hosoe ,  Ichiro Tamai ,  Yoshio Takahashi ,  Kiwamu Tanahashi ,  Satoshi Matsunuma ,  Yoshihiro Shiroishi

IPC分类号： G11B5/66 ,  G11B5/39 ,  G11B5/64 ,  G11B5/65 ,  G11B5/70 ,  G11B5/714 ,  G11B5/738

CPC分类号： G11B5/70 ,  G11B5/714 ,  Y10S428/90

摘要： A magnetic storage device has a magnetic layer, the magnetic crystal grains of which are separated by a nonmagnetic phase. The typical crystal grain is in the approximate shape of a sphere or an ellipsoid. The thickness of the magnetic crystal grains, which is in the direction perpendicular to the surface or the film, is smaller than that of the thickness of the magnetic film. The ratio of the coercive force, which is measured in the circumferential direction, to the coercive force, which is measured in the radial direction, (the orientation ratio of the coercive force), is larger than 1.0, but preferably nor greater than 3.0. Further, the area fraction of the magnetic grains having an extended axis within 30° from the circumferential direction is equal to or more than 45%.

摘要翻译： 磁存储装置具有磁性层，其磁性晶粒由非磁性相分离。 典型的晶粒呈球体或椭圆体的近似形状。 磁性晶粒的与表面或膜垂直的方向的厚度小于磁性膜的厚度。 在圆周方向上测量的矫顽力与径向测定的矫顽力（矫顽力的取向比）的比例大于1.0，优选为3.0以下。 此外，具有从圆周方向的30°以内的延伸轴的磁性颗粒的面积分数等于或大于45％。

公开(公告)号：US06627253B2

公开(公告)日：2003-09-30

申请号：US09897502

申请日：2001-07-03

申请人： Hiroyuki Suzuki ,  Yoshihiro Shiroishi ,  Sadao Hishiyama ,  Tomoyuki Ohno ,  Yotsuo Yahisa ,  Yoshibumi Matsuda ,  Norikazu Tsumita ,  Masaki Ohura ,  Takaaki Shirakura ,  Noriyuki Shige ,  Kazumasa Takagi

发明人： Hiroyuki Suzuki ,  Yoshihiro Shiroishi ,  Sadao Hishiyama ,  Tomoyuki Ohno ,  Yotsuo Yahisa ,  Yoshibumi Matsuda ,  Norikazu Tsumita ,  Masaki Ohura ,  Takaaki Shirakura ,  Noriyuki Shige ,  Kazumasa Takagi

IPC分类号： B32B3100

CPC分类号： G11B5/7325 ,  G11B5/656 ,  Y10T428/12465

摘要： A magnetic recording medium for longitudinal recording with a low media noise, a high S/N ratio and high reliabilities in corrosion resistance is disclosed. By making a magnetic layer from a Co-based alloy comprising 1 to 35 at. % of at least one element selected from the group consisting of Pt and Ir, 1 to 17 at. % of at least one element selected from the group consisting of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, W, Ge and Si, except for Si, whose concentration is 1 to 40 at. and 0.1 to 10 at. of oxygen, a magnetic recording medium for longitudinal recording having an inplane coercivity of 1,200 Oe or more and a coercive squares of not more than 0.85 is obtained. A process for producing the magnetic recording medium for longitudinal medium and a magnetic memory apparatus using the magnetic recording medium for longitudinal recording are also disclosed.

摘要翻译： 公开了一种用于具有低介质噪声，高S / N比和高可靠性的耐腐蚀性的纵向记录用磁记录介质。 通过从包含1至35at。的Co基合金制备磁性层。 选自Pt和Ir中的至少一种元素的％，1至17at。 ％的选自Ti，Zr，Hf，V，Nb，Ta，Cr，Mo，W，Ge和Si中的至少一种元素，Si除外，其浓度为1〜40at。 和0.1〜10at。 的氧，用于纵向记录的磁记录介质具有1,200Oe以上的面内矫顽力和不大于0.85的矫顽正方形。 还公开了用于制造用于纵向介质的磁记录介质的方法和使用用于纵向记录的磁记录介质的磁存储装置。

公开(公告)号：US06569545B1

公开(公告)日：2003-05-27

申请号：US09343721

申请日：1999-06-30

申请人： Tetsuya Kanbe ,  Yuzuru Hosoe ,  Ichiro Tamai ,  Yoshio Takahashi ,  Kiwamu Tanahashi ,  Satoshi Matsunuma ,  Yoshihiro Shiroishi

发明人： Tetsuya Kanbe ,  Yuzuru Hosoe ,  Ichiro Tamai ,  Yoshio Takahashi ,  Kiwamu Tanahashi ,  Satoshi Matsunuma ,  Yoshihiro Shiroishi

IPC分类号： G11B566

CPC分类号： G11B5/70 ,  G11B5/714 ,  Y10S428/90

摘要： A magnetic storage device has a recording density of over 5 gigabits per square inch. In the magnetic layer, the magnetic crystal grains of the granular structure are separated by a nonmagnetic phase. The typical crystal grain is in the approximate shape of a sphere or an ellipsoid. The thickness of the magnetic crystal grains, which is in the direction perpendicular to the surface of the film, is smaller than that of the thickness of the magnetic film. The ratio of the coercive force which is measured in the circumferential direction to the coercive force which is measured in the radial direction, which is the orientation ratio of the coercive force, is larger than 1.0, but preferably not greater than 3.0. Further, the area fraction of the magnetic grains having an extended axis within 30° from the circumferential direction is equal to or more than 45%.

摘要翻译： 磁存储装置具有超过5千兆比特每平方英寸的记录密度。 在磁性层中，粒状结构的磁性晶粒被非磁性相分离。 典型的晶粒呈球体或椭圆体的近似形状。 在与膜表面垂直的方向上的磁性晶粒的厚度小于磁性膜的厚度。 在圆周方向上测量的矫顽力与作为矫顽力的取向比的径向测定的矫顽力的比例大于1.0，优选为3.0以下。 此外，具有从圆周方向的30°以内的延伸轴的磁性颗粒的面积分数等于或大于45％。

公开(公告)号：US06483660B1

公开(公告)日：2002-11-19

申请号：US08992083

申请日：1997-12-17

申请人： Kyo Akagi ,  Toshihisa Tsukada ,  Yoshihiro Shiroishi

发明人： Kyo Akagi ,  Toshihisa Tsukada ,  Yoshihiro Shiroishi

IPC分类号： G11B554

CPC分类号： G11B25/043

摘要： A magnetic disk unit of form factor size with a low power consumption, a short average seek time and a high performance. The unit includes at least two spindles for supporting and rotating magnetic disks. Specifically, two 1.3-inch disks, three 1.0-inch disks or four 0.7-inch disks are arranged in a housing originally intended for a 1.8-inch magnetic disk. The unit further includes a device for writing and reading information while selecting a spindle. The card-type disk unit thus can be reduced in thickness, with a smaller power consumption for starting the disk rotation and further with an improved average seek velocity.

摘要翻译： 具有功耗低，平均寻道时间短，性能好的外形尺寸的磁盘单元。 该单元包括用于支撑和旋转磁盘的至少两个主轴。 具体来说，两个1.3英寸磁盘，三个1.0英寸磁盘或四个0.7英寸磁盘布置在原来用于1.8英寸磁盘的外壳中。 该单元还包括用于在选择主轴时写入和读取信息的装置。 因此，卡型盘单元的厚度可以减小，具有较小的功率消耗用于启动盘旋转，并且还具有改进的平均寻道速度。

公开(公告)号：US06404605B2

公开(公告)日：2002-06-11

申请号：US09725253

申请日：2000-11-29

申请人： Yoshihiro Shiroishi

发明人： Yoshihiro Shiroishi

IPC分类号： G11B5147

CPC分类号： B82Y25/00 ,  B82Y10/00 ,  G11B5/00 ,  G11B5/09 ,  G11B5/313 ,  G11B5/3909 ,  G11B5/3967 ,  G11B5/484 ,  G11B5/656 ,  G11B5/66 ,  G11B5/7325 ,  G11B2005/0002 ,  G11B2005/0005 ,  G11B2005/3996

摘要： A magnetic recording and reading device which has a transfer rate of not less than 50 MB/s and which includes a magnetic recording medium having an absolute value of normalized noise coefficient per recording density of not more than 2.5×10−5 (&mgr;Vrms)(inch)(&mgr;m)0.5/(&mgr;Vpp), and a magnetic head which is mounted on an integrated circuit suspension so that a total inductance is reduced to be not more than 65 nH. The magnetic head has a magnetic core which is not more than 35 &mgr;m of length, a part of the magnetic core being formed by a magnetic film having a resistivity exceeding at least 50 &mgr;&OHgr;cm or by a multilayer film consisting of a magnetic film and an insulating film. A fast R/W-IC having a line width of not more than 0.35 &mgr;m is also provided. The magnetic head is provided with a reading element including one of a giant magnetoresistance effect element and a thin film having tunneling-magnetoresistance effect, with an effective track width of not more than 0.9 &mgr;m, and performs the reading of magnetic information at an areal density of not less than 5 Gb/in2.

摘要翻译： 具有不小于50MB / s的传输速率的磁记录和读取装置，其包括具有不大于2.5×10-5（μVrms）的绝对值的记录密度的绝对值的磁记录介质（英寸） ）（mum）0.5 /（muVpp）和安装在集成电路悬架上的磁头，使得总电感减小到不大于65nH。 磁头具有长度不超过35μm的磁芯，磁芯的一部分由电阻率超过50μΩEGcm的磁性膜形成，或由磁性膜和绝缘体构成的多层膜形成 电影。 还提供了线宽不大于0.35μm的快速R / W-IC。 磁头设置有包括巨磁阻效应元件和具有隧道磁阻效应的薄膜之一的读取元件，有效轨道宽度不大于0.9μm，并且以面密度进行磁信息的读取 不小于5 Gb / in2。

公开(公告)号：US06335103B1

公开(公告)日：2002-01-01

申请号：US08852096

申请日：1997-05-06

申请人： Hiroyuki Suzuki ,  Yoshihiro Shiroishi ,  Sadao Hishiyama ,  Tomoyuki Ohno ,  Yotsuo Yahisa ,  Yoshibumi Matsuda ,  Norikazu Tsumita ,  Masaki Ohura ,  Takaaki Shirakura ,  Noriyuki Shige ,  Kazumasa Takagi

发明人： Hiroyuki Suzuki ,  Yoshihiro Shiroishi ,  Sadao Hishiyama ,  Tomoyuki Ohno ,  Yotsuo Yahisa ,  Yoshibumi Matsuda ,  Norikazu Tsumita ,  Masaki Ohura ,  Takaaki Shirakura ,  Noriyuki Shige ,  Kazumasa Takagi

IPC分类号： H01F100

CPC分类号： G11B5/7325 ,  G11B5/656 ,  Y10S428/928 ,  Y10T428/12465 ,  Y10T428/12861

摘要： A magnetic recording medium including a substrate and a magnetic layer on the substrate which is a Co-based alloy including Pt and/or Ir, including at least one of Ti, Zr, Hr, V, Nb, Ta, Cr, Mo, W, Ge, and Si, and including oxygen. A magnetic memory apparatus including the magnetic recording medium.

摘要翻译： 1.一种磁记录介质，其特征在于，在所述基板上具有由Ti，Zr，Hr，V，Nb，Ta，Cr，Mo，W中的至少一种构成的包含Pt和/或Ir的Co基合金的基板和磁性层 ，Ge和Si，并且包括氧。 一种包括磁记录介质的磁存储装置。