公开(公告)号：US07273666B2

公开(公告)日：2007-09-25

申请号：US10838832

申请日：2004-05-04

申请人： Akiko Handa ,  Kazuhisa Shida ,  Noriyuki Asakura ,  Akira Kikuchi

发明人： Akiko Handa ,  Kazuhisa Shida ,  Noriyuki Asakura ,  Akira Kikuchi

IPC分类号： G11B5/66

CPC分类号： G11B5/7325 ,  G11B5/656

摘要： A magnetic recording medium and a magnetic recording medium driving apparatus are disclosed. By providing a plurality of intermediate layers made of a CoCr alloy of which saturation magnetic flux densities are controlled within a predetermined range, the magnetic recording medium, and the magnetic recording medium driving apparatus, realize a high S/Nm and thermal stability.

摘要翻译： 公开了磁记录介质和磁记录介质驱动装置。 通过提供由饱和磁通密度控制在预定范围内的CoCr合金制成的多个中间层，磁记录介质和磁记录介质驱动装置实现高S / Nm和热稳定性。

公开(公告)号：US20090242389A1

公开(公告)日：2009-10-01

申请号：US12409062

申请日：2009-03-23

申请人： Noriyuki Asakura ,  Hideaki Takahoshi ,  Jun Taguchi ,  Isatake Kaitsu ,  Akira Kikuchi

发明人： Noriyuki Asakura ,  Hideaki Takahoshi ,  Jun Taguchi ,  Isatake Kaitsu ,  Akira Kikuchi

IPC分类号： C23C14/14 ,  C23C14/34

CPC分类号： C23C14/352 ,  B82Y25/00 ,  C23C14/08 ,  G11B5/65 ,  G11B5/851 ,  H01F10/007 ,  H01F41/18

摘要： A method for manufacturing a magnetic recording medium including a nonmagnetic substrate, an intermediate layer over the nonmagnetic substrate, and a granular magnetic layer for recording information, disposed on the intermediate layer. The method includes sputtering a Co alloy, a Ti oxide, a Si oxide and a Co oxide simultaneously to form the granular magnetic layer containing Co alloy magnetic particles and an oxide magnetically separating the magnetic particles.

摘要翻译： 一种制造包括非磁性基片，非磁性基片上的中间层和用于记录信息的粒状磁性层的磁记录介质的方法，该方法设置在中间层上。 该方法包括同时溅射Co合金，Ti氧化物，Si氧化物和Co氧化物，以形成含有Co合金磁性颗粒的粒状磁性层和磁性分离磁性颗粒的氧化物。

公开(公告)号：US20080204937A1

公开(公告)日：2008-08-28

申请号：US12002555

申请日：2007-12-18

申请人： Yuuki Yoshida ,  Jun Taguchi ,  Kazuhisa Shida ,  Noriyuki Asakura ,  Akira Kikuchi

发明人： Yuuki Yoshida ,  Jun Taguchi ,  Kazuhisa Shida ,  Noriyuki Asakura ,  Akira Kikuchi

IPC分类号： G11B5/60 ,  G11B5/33 ,  G11B21/20 ,  B05D5/12

CPC分类号： G11B5/66 ,  G11B5/656 ,  H01F10/16

摘要： This magnetic recording medium comprising at least a non-magnetic underlayer on a non-magnetic substrate, a first recording magnetic layer on the non-magnetic underlayer, a second recording magnetic layer on the first recording magnetic layer, and a third recording magnetic layer on the second recording magnetic layer. The first recording magnetic layer, the second recording magnetic layer and the third recording magnetic layer are made of a CoCrPtB alloy. The second recording magnetic layer has a smaller Cr content and a greater B content than the first recording magnetic layer, and the third recording magnetic layer has a smaller Cr content and a greater B content than the first recording magnetic layer and a smaller Pt content than the second recording magnetic layer. The magnetic recording medium according to the present invention can obtain high output medium characteristic with low noise and excellent written performance.

摘要翻译： 该磁记录介质至少包括非磁性基底上的非磁性底层，非磁性底层上的第一记录磁性层，第一记录磁性层上的第二记录磁性层和第一记录磁性层 第二记录磁性层。 第一记录磁性层，第二记录磁性层和第三记录磁性层由CoCrPtB合金制成。 第二记录磁性层比第一记录磁性层具有更小的Cr含量和更大的B含量，并且第三记录磁性层具有比第一记录磁性层更小的Cr含量和更大的B含量，并且Pt含量比 第二记录磁性层。 根据本发明的磁记录介质可以获得具有低噪声和优良书写性能的高输出介质特性。

公开(公告)号：US20080131736A1

公开(公告)日：2008-06-05

申请号：US11901315

申请日：2007-09-17

申请人： Kazuhisa Shida ,  Yuki Yoshida ,  Jun Taguchi ,  Noriyuki Asakura ,  Akira Kikuchi

发明人： Kazuhisa Shida ,  Yuki Yoshida ,  Jun Taguchi ,  Noriyuki Asakura ,  Akira Kikuchi

IPC分类号： G11B5/66

CPC分类号： G11B5/7325

摘要： A longitudinal magnetic recording medium includes, in order from a nonmagnetic substrate, a primary coat layer that contains Cr, an intermediate layer, a magnetic layer as a recording layer made of CoCr alloy, and a protective layer, the intermediate layer including a RuCr intermediate layer made of a RuCr alloy that contains 10 to 50 at % of Cr.

摘要翻译： 纵向磁记录介质依次包括含有Cr的中间层，作为由CoCr合金制成的记录层的磁性层的主涂层和保护层，该中间层包含RuCr中间体 由含有10〜50原子％的Cr的RuCr合金制成的层。

公开(公告)号：US20080096054A1

公开(公告)日：2008-04-24

申请号：US11704880

申请日：2007-02-09

申请人： Jun Taguchi ,  Yuki Yoshida ,  Kazuhisa Shida ,  Noriyuki Asakura ,  Akira Kikuchi

发明人： Jun Taguchi ,  Yuki Yoshida ,  Kazuhisa Shida ,  Noriyuki Asakura ,  Akira Kikuchi

IPC分类号： G11B5/66

CPC分类号： G11B5/7325

摘要： A magnetic recording medium includes a substrate having a surface where a texture is formed along a recording direction; a first underlayer formed on the surface of the substrate and made of Cr or CrMn; a second underlayer formed on the first underlayer and made of CrMn; a third underlayer formed on the second underlayer and made of Cr—X1 alloy wherein X1 includes a material selected from the group consisting of Mo, Ti, W, V, Ta, and Nb; and a recording layer formed on the third underlayer and made of a ferromagnetic material whose main ingredient is Co; wherein content of Mn of the second underlayer is greater than content of Mn of the first underlayer if the first underlayer is made of CrMn; and a total of film thicknesses of the first underlayer and the second underlayer is in a range between 2 nm and 7 nm.

摘要翻译： 磁记录介质包括具有沿着记录方向形成纹理的表面的基板; 在基板表面上形成由Cr或CrMn制成的第一底层; 在第一底层上形成的由CrMn制成的第二底层; 在第二底层上形成的由Cr-X1合金制成的第三底层，其中X1包括选自Mo，Ti，W，V，Ta和Nb的材料; 以及形成在第三底层上并由主要成分为Co的铁磁材料制成的记录层; 如果第一底层由CrMn制成，则第二底层的Mn含量大于第一底层的Mn含量; 并且第一底层和第二底层的总膜厚度在2nm和7nm之间的范围内。

公开(公告)号：US20080081218A1

公开(公告)日：2008-04-03

申请号：US11789297

申请日：2007-04-24

申请人： Kazuhisa Shida ,  Yuki Yoshida ,  Jun Taguchi ,  Noriyuki Asakura ,  Akira Kikuchi

发明人： Kazuhisa Shida ,  Yuki Yoshida ,  Jun Taguchi ,  Noriyuki Asakura ,  Akira Kikuchi

IPC分类号： G11B5/33

CPC分类号： G11B5/82 ,  G11B5/66 ,  Y10T428/11

摘要： A magnetic recording medium includes a substrate, an underlayer of a chromium alloy formed on the substrate, a ferromagnetic layer formed on the underlayer, a spacer layer formed on the ferromagnetic layer, and a recording layer of a cobalt-chromium alloy formed on the spacer layer. The spacer layer is formed with a ruthenium-cobalt-based alloy.

摘要翻译： 磁记录介质包括基板，形成在基板上的铬合金的底层，形成在底层上的铁磁层，形成在铁磁层上的间隔层，以及形成在间隔物上的钴 - 铬合金记录层 层。 间隔层由钌钴基合金形成。