公开(公告)号：US06372367B1

公开(公告)日：2002-04-16

申请号：US09309580

申请日：1999-05-11

申请人： Yoshibumi Matsuda ,  Yotsuo Yahisa ,  Hiroyuki Suzuki ,  Koji Sakamoto ,  Yoko Ogawa ,  Hiroshi Tani ,  Susumu Funamoto ,  Akira Kato ,  Yuzuru Hosoe

发明人： Yoshibumi Matsuda ,  Yotsuo Yahisa ,  Hiroyuki Suzuki ,  Koji Sakamoto ,  Yoko Ogawa ,  Hiroshi Tani ,  Susumu Funamoto ,  Akira Kato ,  Yuzuru Hosoe

IPC分类号： B32B302

CPC分类号： G11B5/7325 ,  B32B3/02 ,  B32B15/04 ,  G11B5/656

摘要： A magnetic recording medium having a high reliability of durability against frictional motion can be ensured even in a severe rubbing test, while a low noise characteristic important for achievement of high-density recording is kept. A first underlayer made of an alloy containing Co or Ni as a main component and containing Cr and Zr simultaneously is formed over a base, a second underlayer having a rough surface is formed on the first underlayer, a third underlayer made of an alloy containing Ni as a main component and containing Cr and Zr simultaneously is formed over the second underlayer, a fourth underlayer as a film for controlling crystalline orientation is formed on the third underlayer, a magnetic layer made of an alloy containing cobalt a main component is formed over the fourth underlayer, and a protective film containing carbon as a main component is formed on the magnetic layer.

摘要翻译： 即使在严重的摩擦试验中也能够确保具有高摩擦运动耐久性的可靠性的磁记录介质，同时保持对于实现高密度记录重要的低噪声特性。 在基体上形成由含有Co或Ni作为主要成分并含有Cr和Zr的合金制成的第一底层，在第一底层上形成具有粗糙表面的第二底层，由含Ni的合金制成的第三底层 作为主要成分并且在第二底层上同时形成含有Cr和Zr的第三底层，在第三底层上形成作为用于控制结晶取向的膜的第四底层，在包含主要成分的钴的合金制成的磁性层上形成 第四底层，在该磁性层上形成含有碳的保护膜作为主要成分。

公开(公告)号：US06544667B1

公开(公告)日：2003-04-08

申请号：US09523381

申请日：2000-03-10

申请人： Yuzuru Hosoe ,  Yoshibumi Matsuda ,  Yotsuo Yahisa ,  Kiwamu Tanahashi ,  Hiroyuki Suzuki ,  Koji Sakamoto ,  Akira Kato

发明人： Yuzuru Hosoe ,  Yoshibumi Matsuda ,  Yotsuo Yahisa ,  Kiwamu Tanahashi ,  Hiroyuki Suzuki ,  Koji Sakamoto ,  Akira Kato

IPC分类号： G11B565

CPC分类号： G11B5/7325 ,  G11B5/656 ,  G11B5/732 ,  G11B5/851 ,  Y10T428/12465 ,  Y10T428/12833 ,  Y10T428/1284 ,  Y10T428/12854 ,  Y10T428/12875 ,  Y10T428/26 ,  Y10T428/265

摘要： In a magnetic recording medium having Co-based alloy magnetic layer containing Pt formed on a substrate through an underlayer, by forming said underlayer with plural underlayers including double layer structure which is formed by piling up 1st underlayer of Cr-based alloy containing Ti and 2nd underlayer of Cr-based alloy containing at least one element selected from a group comprising Mo and W in this sequence, crystal grain diameter is decreased and then medium noise can be decreased, and c axis is oriented to in-plane direction and then high coercivity can be obtained, consequently the magnetic recording medium having high signal to noise ratio at high recording density region is obtained. Further a small size large capacity magnetic recording system can be provided by combination of said magnetic recording media with a MR (magnetoresistive) head.

摘要翻译： 在具有通过底层形成在基板上的具有Co的Co基合金磁性层的磁记录介质中，通过将包含双层结构的多个底层形成所述底层，所述双层结构通过堆叠含有Ti和第二层的Cr基合金的第一底层而形成 在该顺序中含有选自Mo和W的至少一种元素的Cr基合金的下层，晶粒直径减小，然后可以降低中等噪声，并且c轴取向于面内方向，然后取向于高矫顽力 可以得到在高记录密度区域具有高信噪比的磁记录介质。 此外，可以通过所述磁记录介质与MR（磁阻）磁头的组合来提供小尺寸的大容量磁记录系统。

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：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：US06887565B2

公开(公告)日：2005-05-03

申请号：US10306361

申请日：2002-11-27

申请人： Tetsuya Kanbe ,  Yotsuo Yahisa ,  Hiroyuki Suzuki ,  Hidekazu Kashiwase

发明人： Tetsuya Kanbe ,  Yotsuo Yahisa ,  Hiroyuki Suzuki ,  Hidekazu Kashiwase

IPC分类号： G11B5/738 ,  G11B5/64 ,  G11B5/65 ,  G11B5/66 ,  G11B5/73 ,  G11B5/70

CPC分类号： G11B5/7325 ,  G11B5/66 ,  Y10S428/90 ,  Y10T428/12465 ,  Y10T428/12854 ,  Y10T428/265

摘要： An inplane magnetic recording medium having high S/N and thermal stability and a reliable magnetic storage device having surface recording density of 50 megabit/mm2 or more is described. The magnetic recording medium includes magnetic layers formed on a nonmagnetic substrate with a plurality of ground layers therebetween, at least one of the ground layers formed from an alloy of a body-centered cubic structure containing Cr as a main component and B of from 2 atomic % to 12 atomic %. Main components of the magnetic layers include a lower magnetic layer containing Co and Cr of from 10 atomic % to 16 atomic %, with film thickness of from 1.5 nm to 4.5 nm, and an upper magnetic layer containing Co, coupling anti-ferromagnetically with the lower magnetic layer through nonmagnetic intermediate layers.

公开(公告)号：US07338725B2

公开(公告)日：2008-03-04

申请号：US11072042

申请日：2005-03-03

申请人： Tetsuya Kanbe ,  Yotsuo Yahisa ,  Hiroyuki Suzuki ,  Hidekazu Kashiwase

发明人： Tetsuya Kanbe ,  Yotsuo Yahisa ,  Hiroyuki Suzuki ,  Hidekazu Kashiwase

IPC分类号： G11B5/66 ,  G11B5/70

CPC分类号： G11B5/7325 ,  G11B5/66 ,  Y10S428/90 ,  Y10T428/12465 ,  Y10T428/12854 ,  Y10T428/265

摘要： An inplane magnetic recording medium having high S/N and thermal stability and a reliable magnetic storage device having surface recording density of 50 megabit/mm2 or more is described. The magnetic recording medium includes magnetic layers formed on a nonmagnetic substrate with a plurality of ground layers therebetween, at least one of the ground layers formed from an alloy of a body-centered cubic structure containing Cr as a main component and B of from 2 atomic % to 12 atomic %. Main components of the magnetic layers include a lower magnetic layer containing Co and Cr of from 10 atomic % to 16 atomic %, with film thickness of from 1.5 nm to 4.5 nm, and an upper magnetic layer containing Co, coupling anti-ferromagnetically with the lower magnetic layer through nonmagnetic intermediate layers.

摘要翻译： 描述了具有高S / N和热稳定性的内置磁记录介质和具有50兆比特/平方毫米或更高的表面记录密度的可靠的磁存储装置。 磁记录介质包括形成在非磁性基底上的磁性层，其间具有多个接地层，至少一个接地层由以Cr为主要成分的体心立方结构的合金形成，B为2原子 ％至12原子％。 磁性层的主要成分包括含有10原子％〜16原子％的Co和Cr的下部磁性层，膜厚为1.5nm〜4.5nm，上部磁性层为Co，与铁素体 通过非磁性中间层降低磁性层。

公开(公告)号：US07163756B2

公开(公告)日：2007-01-16

申请号：US10733928

申请日：2003-12-10

申请人： Tomoo Yamamoto ,  Yotsuo Yahisa ,  Tatsuya Hinoue ,  Hidekazu Kashiwase ,  Tetsuya Kanbe ,  Hiroyuki Suzuki

发明人： Tomoo Yamamoto ,  Yotsuo Yahisa ,  Tatsuya Hinoue ,  Hidekazu Kashiwase ,  Tetsuya Kanbe ,  Hiroyuki Suzuki

IPC分类号： G11B5/66

CPC分类号： G11B5/732 ,  G11B5/66 ,  G11B5/7325

摘要： A large-capacity, low-cost, longitudinal magnetic recording medium capable of ultra-high-density recording of 70 Gigabits or more per square inch is disclosed. The longitudinal magnetic recording medium of the present invention comprises a first seed layer, a second seed layer, a first underlayer, a second underlayer, and a magnetic layer, which are formed on a nonmagnetic substrate in this order. A material containing at least Al and any one of Ru and Re is used to form the second seed layer, and a material containing at least any one of Co and Ni and one or both of Al and Ti is used to form the first underlayer. It is also possible to use Cr or a Cr alloy containing Cr and at least one element selected from the constituent element group A consisting of Ti, Mo, and W for forming the second seed layer.

摘要翻译： 公开了能够以每平方英寸70吉比特或更多的超高密度记录的大容量，低成本的纵向磁记录介质。 本发明的纵向磁记录介质包括依次形成在非磁性基板上的第一种子层，第二籽晶层，第一底层，第二底层和磁性层。 使用至少包含Al和Ru和Re中的任何一种的材料来形成第二种子层，并且使用包含Co和Ni中的至少一种以及Al和Ti中的一种或两种的材料来形成第一底层。 也可以使用含有Cr的Cr或Cr合金和选自由Ti，Mo和W构成的构成元素组A中的至少一种元素来形成第二种子层。