公开(公告)号：US06884521B2

公开(公告)日：2005-04-26

申请号：US10358342

申请日：2003-02-05

申请人： Yoshio Takahashi ,  Yotsuo Yahisa ,  Yoshiyuki Hirayama

发明人： Yoshio Takahashi ,  Yotsuo Yahisa ,  Yoshiyuki Hirayama

IPC分类号： G11B5/65 ,  G11B5/64 ,  G11B5/667 ,  G11B5/73 ,  G11B5/738 ,  G11B5/84

CPC分类号： G11B5/732 ,  G11B5/65 ,  G11B5/667 ,  G11B5/7325 ,  G11B5/8404 ,  Y10T29/49021 ,  Y10T29/49025 ,  Y10T29/49032 ,  Y10T29/49041 ,  Y10T29/49044 ,  Y10T29/49078 ,  Y10T29/49224 ,  Y10T428/12465 ,  Y10T428/12757 ,  Y10T428/24355 ,  Y10T428/31

摘要： Disclosed is a magnetic recording medium and a method for manufacturing the same to provide a magnetic recording medium reducing medium noise and having excellent thermal stability. The magnetic recording medium includes a substantially amorphous seed layer and a polycrystal underlayer made of crystal grains having a substantially columnar structure, the polycrystal underlayer contacting thereto. In a boundary between the seed layer and the underlayer, fine grooves having a period up to as large as the magnetic layer crystal grain diameter are formed in the disc circumferential direction. Accordingly, the magnetic recording medium is allowed to have a grain shape with a value obtained by dividing the average grain diameter for the disc circumferential direction by the average grain diameter for the disc radial direction of no less than 0.5 and no more than 0.9, thus achieving simultaneously reduction of the medium noise and thermal stability.

摘要翻译： 公开了一种磁记录介质及其制造方法，以提供磁记录介质降低介质噪声并具有优异的热稳定性。 磁记录介质包括基本上无定形的种子层和由具有基本上柱状结构的晶粒制成的多晶底层，多晶底层与其接触。 在种子层和底层之间的边界处，在盘周向形成有具有与磁性层晶粒直径一样大的周期的细槽。 因此，使磁记录介质具有通过将盘圆周方向的平均粒径除以盘径向的平均粒径为不小于0.5且不大于0.9而获得的值的晶粒形状，因此 实现中等噪声和热稳定性的同时降低。

公开(公告)号：US5605733A

公开(公告)日：1997-02-25

申请号：US7969

申请日：1993-01-22

申请人： Akira Ishikawa ,  Sadao Hishiyama ,  Tomoo Yamamoto ,  Yoshihiro Shiroishi ,  Tomoyuki Ohno ,  Yotsuo Yahisa ,  Yukio Kato

发明人： Akira Ishikawa ,  Sadao Hishiyama ,  Tomoo Yamamoto ,  Yoshihiro Shiroishi ,  Tomoyuki Ohno ,  Yotsuo Yahisa ,  Yukio Kato

IPC分类号： G11B5/64 ,  G11B5/73 ,  G11B5/84 ,  G11B5/66

CPC分类号： G11B5/66 ,  G11B5/64 ,  G11B5/656 ,  G11B5/7325 ,  G11B5/8404 ,  Y10T428/24355 ,  Y10T428/265

摘要： A thin-film magnetic recording medium improves the magnetostatic and dynamic magnetic characteristics of the conventional magnetic recording media. In one embodiment, the substrate surface is textured in both the circumferential and radial directions. In further embodiments, a variety of underlayers (13) and crystal orientation control layers (17) are provided in accordance with specific parameters to control the crystal structure of the magnetic layer (14). Finally, an embodiment includes multiple magnetic layers (14, 19) having respectively different residual magnetic flux densities and thicknesses, but similar dot products of residual magnetic flux density and thickness.

摘要翻译： 薄膜磁记录介质改善了常规磁记录介质的静磁和动态磁特性。 在一个实施例中，衬底表面在周向和径向方向上均纹理化。 在另外的实施例中，根据具体参数提供各种底层（13）和晶体取向控制层（17）以控制磁性层（14）的晶体结构。 最后，一个实施例包括分别具有不同剩余磁通密度和厚度的多个磁性层（14,19），但是剩余磁通密度和厚度的类似点积。

公开(公告)号：US5236791A

公开(公告)日：1993-08-17

申请号：US399775

申请日：1989-08-28

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

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

IPC分类号： G11B5/02 ,  G11B5/64 ,  G11B5/65 ,  G11B5/66 ,  G11B5/72 ,  G11B5/73

CPC分类号： G11B5/72 ,  Y10S428/90 ,  Y10T428/12465 ,  Y10T428/12542 ,  Y10T428/12576 ,  Y10T428/1259 ,  Y10T428/12611 ,  Y10T428/1266 ,  Y10T428/12674 ,  Y10T428/12806 ,  Y10T428/12854 ,  Y10T428/12875 ,  Y10T428/12931

摘要： A magnetic recording medium that uses, as a protective coating layer provided on a magnetic layer for magnetically recording signals, a layer made of a nonmagnetic material consisting of two ore more elements of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, and W, and one or more elements of N, C, O, and B, or made of a magnetic material consisting of one or more elements of Co, Fe, Ni, and Gd, one or more elements of Ti, Zr, Hf, V, Nb, Ta, Cr, Mo, and W, and one or more elements of N, C, O, B, and Si is excellent in sliding endurance. When the protective coating layer is made of the nonmagnetic material, the magnetic recording medium is also excellent in corrosion resistance, and when the protective coating layer is made of the magnetic material, the spacing between a magnetic head and the magnetic recording medium can advantageously be made large. Both the cases are high in reliability, and suitable for high density magnetic recording. The magnetic recording medium can be used in combination with a magnetic head that uses a metal magnetic alloy as at least part of the magnetic core to provide an excellent magnetic storage.

摘要翻译： 一种磁记录介质，其使用设置在用于磁记录信号的磁性层上的保护涂层，由由Ti，Zr，Hf，V，Nb，Ta，Cr两种以上的元素组成的非磁性材料制成的层， Mo和W以及一种或多种N，C，O和B的元素，或由Co，Fe，Ni和Gd的一种或多种元素组成的磁性材料制成，Ti，Zr的一种或多种元素 ，Hf，V，Nb，Ta，Cr，Mo和W，N，C，O，B和Si的一种或多种元素的滑动耐久性优异。 当保护涂层由非磁性材料制成时，磁记录介质也具有优异的耐腐蚀性，并且当保护涂层由磁性材料制成时，磁头和磁记录介质之间的间距可以有利地是 做大了 这两种情况都具有高可靠性，适用于高密度磁记录。 磁记录介质可以与使用金属磁性合金作为磁芯的至少一部分的磁头组合使用以提供优异的磁存储。

公开(公告)号：US20120044595A1

公开(公告)日：2012-02-23

申请号：US12861725

申请日：2010-08-23

申请人： Yotsuo Yahisa ,  Ichiro Tamai ,  Akemi Hirotsune

发明人： Yotsuo Yahisa ,  Ichiro Tamai ,  Akemi Hirotsune

IPC分类号： G11B21/02 ,  G11B5/66

CPC分类号： G11B5/7325

摘要： In one embodiment, a perpendicular magnetic recording medium (PMRM) includes a first interlayer comprising Ru or a Ru alloy, a second interlayer above the first interlayer comprising Ru or a Ru alloy, and a third interlayer formed between the first interlayer and the second interlayer that reduces an average cluster size of the second interlayer. In another embodiment, a PMRM includes a first interlayer comprising Ru or a Ru alloy, a second interlayer above the first interlayer comprising Ru or a Ru alloy, and a third interlayer formed between the first interlayer and the second interlayer that reduces an average cluster size of the second interlayer. The third interlayer has a thickness of between about 1.0 nm and about 3.0 nm and has a structure selected from a group consisting of: BCC, B2, C11b, L21, and D03. Other PMRMs and methods of fabrication are presented as well.

摘要翻译： 在一个实施方案中，垂直磁记录介质（PMRM）包括包含Ru或Ru合金的第一中间层，包含Ru或Ru合金的第一中间层上的第二中间层，以及在第一中间层和第二中间层之间形成的第三中间层 这降低了第二夹层的平均簇尺寸。 在另一个实施方案中，PMRM包括包含Ru或Ru合金的第一中间层，包含Ru或Ru合金的第一中间层上的第二中间层，以及形成在第一中间层和第二中间层之间的第三中间层，其降低平均簇尺寸 的第二中间层。 第三中间层的厚度为约1.0nm至约3.0nm，并且具有选自由BCC，B2，C11b，L21和D03组成的组的结构。 还提出了其他PMRM和制造方法。

公开(公告)号：US20050138796A1

公开(公告)日：2005-06-30

申请号：US11062652

申请日：2005-02-23

申请人： Yoshio Takahashi ,  Yotsuo Yahisa ,  Yoshiyuki Hirayama

发明人： Yoshio Takahashi ,  Yotsuo Yahisa ,  Yoshiyuki Hirayama

IPC分类号： G11B5/65 ,  G11B5/64 ,  G11B5/667 ,  G11B5/73 ,  G11B5/738 ,  G11B5/84 ,  B05D5/12 ,  G11B5/127

CPC分类号： G11B5/732 ,  G11B5/65 ,  G11B5/667 ,  G11B5/7325 ,  G11B5/8404 ,  Y10T29/49021 ,  Y10T29/49025 ,  Y10T29/49032 ,  Y10T29/49041 ,  Y10T29/49044 ,  Y10T29/49078 ,  Y10T29/49224 ,  Y10T428/12465 ,  Y10T428/12757 ,  Y10T428/24355 ,  Y10T428/31

摘要： Disclosed is a magnetic recording medium and a method for manufacturing the same to provide a magnetic recording medium reducing medium noise and having excellent thermal stability. The magnetic recording medium includes a substantially amorphous seed layer and a polycrystal underlayer made of crystal grains having a substantially columnar structure, the polycrystal underlayer contacting thereto. In a boundary between the seed layer and the underlayer, fine grooves having a period up to as large as the magnetic layer crystal grain diameter are formed in the disc circumferential direction. Accordingly, the magnetic recording medium is allowed to have a grain shape with a value obtained by dividing the average grain diameter for the disc circumferential direction by the average grain diameter for the disc radial direction of no less than 0.5 and no more than 0.9, thus achieving simultaneously reduction of the medium noise and thermal stability.

摘要翻译： 公开了一种磁记录介质及其制造方法，以提供磁记录介质降低介质噪声并具有优异的热稳定性。 磁记录介质包括基本上无定形的种子层和由具有基本上柱状结构的晶粒制成的多晶底层，多晶底层与其接触。 在种子层和底层之间的边界处，在盘周向形成有具有与磁性层晶粒直径一样大的周期的细槽。 因此，使磁记录介质具有通过将盘圆周方向的平均粒径除以盘径向的平均粒径为不小于0.5且不大于0.9而获得的值的晶粒形状，因此 实现中等噪声和热稳定性的同时降低。

公开(公告)号：US5906884A

公开(公告)日：1999-05-25

申请号：US518391

申请日：1995-08-15

申请人： Yotsuo Yahisa ,  Yoshibumi Matsuda ,  Joe Inagaki ,  Enji Fujita ,  Takao Yonekawa ,  Mitsuhiro Shoda ,  Akira Kato ,  Yuzuru Hosoe ,  Masukazu Igarashi

发明人： Yotsuo Yahisa ,  Yoshibumi Matsuda ,  Joe Inagaki ,  Enji Fujita ,  Takao Yonekawa ,  Mitsuhiro Shoda ,  Akira Kato ,  Yuzuru Hosoe ,  Masukazu Igarashi

IPC分类号： G11B5/66 ,  G11B5/65 ,  G11B5/73 ,  G11B5/82 ,  G11B33/08

CPC分类号： G11B5/7315 ,  G11B5/7325 ,  G11B5/82 ,  G11B33/08 ,  Y10S428/90

摘要： A magnetic recording medium has a substrate made of a nonmetal nonmagnetic material whose coefficient of linear expansion lies within a range from 0.000013/deg to 0.0001/deg. A magnetic layer is formed on the substrate as a thin polycrystalline film or a thin amorphous film. The magnetic layer has Co as a main component, which exhibits a negative magnetostrictive constant so that its coercive force rises in the direction of compressive strain. The magnetic layer is subjected to an in-plane compressive strain from the substrate due to a difference between the coefficient of thermal expansion of the substrate and the magnetic layer so that high coercivity is obtained in the magnetic layer.

摘要翻译： 磁记录介质具有由非金属非磁性材料制成的基板，其线性膨胀系数在0.000013 / deg至0.0001 / deg的范围内。 作为薄多晶膜或薄的无定形膜，在基板上形成磁性层。 磁性层具有Co作为主要成分，其表现出负的磁致伸缩常数，使其矫顽力沿压缩应变的方向上升。 由于衬底的热膨胀系数与磁性层之间的差异，磁性层受到来自衬底的面内压缩应变，从而在磁性层中获得高的矫顽力。

公开(公告)号：US5723198A

公开(公告)日：1998-03-03

申请号：US258923

申请日：1994-06-13

申请人： 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

发明人： 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分类号： G11B5/66

CPC分类号： G11B5/66 ,  Y10S428/90 ,  Y10T428/24355 ,  Y10T428/24942 ,  Y10T428/265

摘要： 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.

摘要翻译： 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。