公开(公告)号：US4743491A

公开(公告)日：1988-05-10

申请号：US793772

申请日：1985-11-01

申请人： Seiichi Asada ,  Hiroyuki Suzuki ,  Toshio Niihara ,  Kazuetsu Yoshida ,  Masaaki Futamoto ,  Yukio Honda ,  Norikazu Tsumita ,  Kazuo Shiiki

发明人： Seiichi Asada ,  Hiroyuki Suzuki ,  Toshio Niihara ,  Kazuetsu Yoshida ,  Masaaki Futamoto ,  Yukio Honda ,  Norikazu Tsumita ,  Kazuo Shiiki

IPC分类号： G11B5/66 ,  G11B5/73 ,  G11B7/24

CPC分类号： G11B5/7325 ,  G11B5/66 ,  Y10S428/90 ,  Y10T428/2495 ,  Y10T428/265 ,  Y10T428/31678

摘要： A perpendicular magnetic recording medium according to this invention comprises an electrically conductive underlayer formed on a non-magnetic substrate, in the case where no high permeability magnetic film is deposited, and a magnetic thin film having a perpendicular magnetic anisotrophy is formed thereon. In the case of a so-called double-layer structure including a high permeablilty magnetic film, on the non-magnetic substrate are formed the high permeablilty magnetic film, an intermediate film, and a magnetic thin film one on another in this order. The nearest neighbor's distance of atoms of the underlayer and the intermediate film is not smaller than 0.25 nm (2.5 .ANG.) and not greater than 0.32 nm (3.2 .ANG.) and they are made of at least one selected from the group consisting of V, Ru, Zn, Os, Rh, Ir, Mo, W, Re, Pd, Pt, Nb, Ta, Sn, Al, Au, Ag, Ti, nitrides and oxides of these elements.

摘要翻译： 根据本发明的垂直磁记录介质包括形成在非磁性基板上的导电底层，在没有沉积高磁导率磁性膜的情况下，并且在其上形成具有垂直磁性各向异性的磁性薄膜。 在包括高透度磁性膜的所谓双层结构的情况下，在非磁性基板上依次形成高磁导率磁性膜，中间膜和磁性薄膜。 最邻近的底层原子与中间膜的距离不小于0.25nm（2.5），不大于0.32nm（3.2），它们由选自V，Ru ，Zn，Os，Rh，Ir，Mo，W，Re，Pd，Pt，Nb，Ta，Sn，Al，Au，Ag，Ti，氮化物和这些元素的氧化物。

公开(公告)号：US4840844A

公开(公告)日：1989-06-20

申请号：US56661

申请日：1987-06-02

申请人： Masaaki Futamoto ,  Yukio Honda ,  Shinichiro Saito ,  Takashi Nishimura ,  Kazuetsu Yoshida ,  Toyoji Okuwaki ,  Hitoshi Iwata ,  Hiroyuki Suzuki ,  Kazushige Imagawa ,  Hideo Daimon ,  Osamu Kitakami ,  Hideo Fujiwara

发明人： Masaaki Futamoto ,  Yukio Honda ,  Shinichiro Saito ,  Takashi Nishimura ,  Kazuetsu Yoshida ,  Toyoji Okuwaki ,  Hitoshi Iwata ,  Hiroyuki Suzuki ,  Kazushige Imagawa ,  Hideo Daimon ,  Osamu Kitakami ,  Hideo Fujiwara

IPC分类号： G11B5/72

CPC分类号： G11B5/72 ,  Y10S428/90 ,  Y10T428/265 ,  Y10T428/30 ,  Y10T428/31678

摘要： A magnetic recording medium which comprises a non-magnetic substrate, a magnetic film formed on the substrate and a protective film provided on the magnetic film, the protective film being composed of at least two groups of element, the element in one group being at least one of B and C having a smaller atomic size, and a concentration of the element increasing from the interface side of the protective film with the magnetic film toward the opposite face side throughout the protective film has an improved durability against a magnetic head.

摘要翻译： 一种磁记录介质，其包括非磁性基板，形成在所述基板上的磁性膜和设置在所述磁性膜上的保护膜，所述保护膜由至少两组元件组成，一组中的元素至少为 B和C之一具有较小的原子尺寸，并且从保护膜与磁性膜的界面侧朝着保护膜的相对面侧增加的元素的浓度具有改善的对磁头的耐久性。

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：US6010794A

公开(公告)日：2000-01-04

申请号：US852096

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

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.

公开(公告)号：US4883711A

公开(公告)日：1989-11-28

申请号：US133357

申请日：1987-12-15

申请人： Yoshihiro Shiroishi ,  Sadao Hishiyama ,  Hiroyuki Suzuki ,  Tomoyuki Ohno ,  Yoshibumi Matsuda ,  Kazumasa Takagi ,  Norikazu Tsumita ,  Yasushi Kitazaki ,  Masaki Ohura ,  Sadanori Nagaike

发明人： Yoshihiro Shiroishi ,  Sadao Hishiyama ,  Hiroyuki Suzuki ,  Tomoyuki Ohno ,  Yoshibumi Matsuda ,  Kazumasa Takagi ,  Norikazu Tsumita ,  Yasushi Kitazaki ,  Masaki Ohura ,  Sadanori Nagaike

IPC分类号： G11B5/66 ,  G11B5/62 ,  G11B5/64 ,  G11B5/706 ,  G11B5/72 ,  G11B5/73 ,  G11B5/738

CPC分类号： G11B5/7325 ,  G11B5/72 ,  Y10S428/90 ,  Y10T428/12465 ,  Y10T428/265

摘要： A magnetic recording medium in which a non-magnetic intermediate layer made of an alloy substantially composed of at least one element selected from the group consisting of Zr, Hf, Ta, Ti and Nb is disposed between a magnetic layer formed on a substrate and a non-magnetic overcoat layer formed on the magnetic layer. Since the impact shock resistance and the vibration resistance of the magnetic recording medium can be improved and the head-medium spacing of the magnetic disc apparatus can be decreased extremely by disposing the non-magnetic intermediate layer, it can provide a increase in the recording density, particularly, in a thin film type magnetic recording medium using a metallic magnetic thin film or metal oxide thin film as the magnetic layer. It can also improve the corrosion resistance in the case of a metallic magnetic thin film type medium.

摘要翻译： 一种磁记录介质，其中由在由Zr，Hf，Ta，Ti和Nb组成的组中选出的至少一种元素基本上构成的合金制成的非磁性中间层设置在形成在基板上的磁性层和 形成在磁性层上的非磁性外涂层。 由于可以通过设置非磁性中间层来提高磁记录介质的冲击冲击强度和抗振动性，并且能够极大地降低磁盘装置的头 - 介质间隔，因此可提高记录密度 特别是在使用金属磁性薄膜或金属氧化物薄膜作为磁性层的薄膜型磁记录介质中。 也可以在金属磁性薄膜型介质的情况下提高耐腐蚀性。

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：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。

公开(公告)号：US5665478A

公开(公告)日：1997-09-09

申请号：US328400

申请日：1994-10-24

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： G11B5/64 ,  G11B5/73 ,  H01F1/00

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

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.

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。 ％，0.1〜10at。 获得氧的百分比，用于纵向记录的磁记录介质，其平面矫顽力为1200奥斯或更高，矫顽正方形不大于0.85。

公开(公告)号：US5143794A

公开(公告)日：1992-09-01

申请号：US391181

申请日：1989-08-08

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： G11B5/64 ,  G11B5/73

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

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至40at。 ％，0.1〜10at。 获得氧的百分比，用于纵向记录的磁记录介质，其平面矫顽力为1200奥斯或更高，矫顽正方形不大于0.85。 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：US4833020A

公开(公告)日：1989-05-23

申请号：US149678

申请日：1988-01-28

申请人： Yoshihiro Shiroishi ,  Sadao Hishiyama ,  Hiroyuki Suzuki ,  Tomoyuki Ohno ,  Yoshibumi Matsuda ,  Kazumasa Takagi ,  Yoshio Gobara ,  Norikazu Tsumita ,  Masaki Ohura ,  Masaaki Hayashi

发明人： Yoshihiro Shiroishi ,  Sadao Hishiyama ,  Hiroyuki Suzuki ,  Tomoyuki Ohno ,  Yoshibumi Matsuda ,  Kazumasa Takagi ,  Yoshio Gobara ,  Norikazu Tsumita ,  Masaki Ohura ,  Masaaki Hayashi

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

CPC分类号： G11B5/7325 ,  Y10S428/90 ,  Y10S428/928 ,  Y10T428/12465 ,  Y10T428/12986 ,  Y10T428/265

摘要： In a magnetic recording medium including an underlayer and a magnetic layer formed sequentially on a substrate, the underlayer is composed of a composite underlayer having an at least two-layered structure, the underlayer on the side of the substrate is made of a material providing low modulation to the magnetic recording medium while the underlayer on the side of the magnetic layer is made of a material providing a high S/N ratio to the medium. This makes it possible to obtain a magnetic recording medium having low modulation and high S/N ratio.

摘要翻译： 在包括在基板上顺序形成的底层和磁性层的磁记录介质中，底层由具有至少两层结构的复合底层构成，底层侧的底层由提供低的材料制成 调制到磁记录介质，而磁层的底层由介质提供高S / N比的材料制成。 这使得可以获得具有低调制和高S / N比的磁记录介质。