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公开(公告)号：US06627301B2
公开(公告)日：2003-09-30
申请号：US09818942
申请日：2001-03-28
申请人： Kenji Shimizu , Akira Itoh , Hiroshi Sakai
发明人： Kenji Shimizu , Akira Itoh , Hiroshi Sakai
IPC分类号： G11B566
CPC分类号： G11B5/656 , G11B5/66 , Y10S428/90 , Y10T428/12465 , Y10T428/12868 , Y10T428/12875 , Y10T428/12951 , Y10T428/24942
摘要： The present invention provides a magnetic recording medium exhibiting excellent noise characteristics and thermal stability. On a substrate, a first undercoat film, a first perpendicular magnetic film, a second undercoat film, a non-magnetic intermediate film, a second perpendicular magnetic film, and a protective film are successively formed, and the magnetic anisotropy energy of the first perpendicular magnetic film is higher than that of the second perpendicular magnetic film.
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2.发明申请公开(公告)号：US20090141399A1
公开(公告)日：2009-06-04
申请号：US12274879
申请日：2008-11-20
申请人： Akira SAKAWAKI , Kenji Shimizu , Kazuo Kobayashi , Hiroshi Sakai , Soichi Oikawa , Takeshi Iwasaki , Tomoyuki Maeda , Futoshi Nakamura
发明人： Akira SAKAWAKI , Kenji Shimizu , Kazuo Kobayashi , Hiroshi Sakai , Soichi Oikawa , Takeshi Iwasaki , Tomoyuki Maeda , Futoshi Nakamura
摘要： A magnetic-recording medium which is provided on a nonmagnetic substrate with at least an orientation-controlling layer for controlling the orientation of a layer formed directly thereon, a perpendicularly magnetic layer having an easily magnetizing axis oriented mainly perpendicularly relative to the nonmagnetic substrate, and a protective layer. The perpendicularly magnetic layer includes two or more magnetic layers, at least one of the magnetic layers is a layer having Co as a main component and containing Pt as well and containing an oxide, and at least another of the magnetic layers is a layer having Co as a main component and containing Cr as well and containing no oxide.
摘要翻译： 一种磁记录介质，其设置在至少具有用于控制直接形成的层的取向的取向控制层的非磁性基板上，具有相对于非磁性基板主要垂直取向的易磁化轴的垂直磁性层，以及 保护层。 垂直磁性层包括两个或更多个磁性层，至少一个磁性层是具有Co作为主要成分并且还含有Pt并含有氧化物的层，并且至少另一个磁性层是具有Co 作为主要成分，并含有Cr，也不含氧化物。
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3.发明授权公开(公告)号：US07166376B2
公开(公告)日：2007-01-23
申请号：US10786611
申请日：2004-02-26
申请人： Takashi Hikosaka , Futoshi Nakamura , Soichi Oikawa , Takeshi Iwasaki , Tomoyuki Maeda , Hiroshi Sakai , Kenji Shimizu , Akira Sakawaki
发明人： Takashi Hikosaka , Futoshi Nakamura , Soichi Oikawa , Takeshi Iwasaki , Tomoyuki Maeda , Hiroshi Sakai , Kenji Shimizu , Akira Sakawaki
IPC分类号： G11B5/66
摘要： A multi-layer including a magnetic recording layer and a high-magnetostriction layer having a magnetostriction constant larger than that of the magnetic recording layer is formed.
摘要翻译： 形成包括磁记录层和磁致伸缩常数大于磁记录层的磁致伸缩常数的高磁致伸缩层的多层。
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4.发明授权公开(公告)号：US07138194B2
公开(公告)日：2006-11-21
申请号：US10630796
申请日：2003-07-31
CPC分类号： G11B5/667 , G11B5/7325
摘要： The magnetic recording medium comprises a soft magnetic undercoat film, an orientation control film that controls the orientation of a film provided directly above, a perpendicular magnetic film of which axis of easy magnetization is generally oriented perpendicular to a non-magnetic substrate, and a protective film, that are provided on the non-magnetic substrate, wherein the orientation control film is made of a Co alloy which contains one or more elements selected from Ti, V, Sr, Y, Nb, Mo, Hf, Ta, Ni and W.
摘要翻译： 磁记录介质包括软磁性底涂膜，控制直接在其上方设置的膜的取向的取向控制膜，容易磁化的轴线大致垂直于非磁性基板的垂直磁性膜，以及保护膜 膜，其中所述取向控制膜由包含选自Ti，V，Sr，Y，Nb，Mo，Hf，Ta，Ni和W中的一种或多种元素的Co合金制成 。
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5.发明授权公开(公告)号：US06818331B2
公开(公告)日：2004-11-16
申请号：US10228952
申请日：2002-08-28
申请人： Akira Sakawaki , Kenji Shimizu , Hiro Mochizuki , Masato Kokubu , Hui Yang , Masakazu Kobayashi , Hiroshi Sakai
发明人： Akira Sakawaki , Kenji Shimizu , Hiro Mochizuki , Masato Kokubu , Hui Yang , Masakazu Kobayashi , Hiroshi Sakai
IPC分类号： G11B566
CPC分类号： G11B5/656 , G11B5/66 , G11B5/851 , Y10S428/90
摘要： A magnetic recording medium having a non-magnetic substrate; an orientation-regulating layer for regulating the crystal orientation of a layer provided directly thereon; a perpendicular magnetic layer in which easy-magnetization axes are oriented generally perpendicular to the substrate; and a protective layer is disclosed. The perpendicular magnetic layer is formed from a material containing Co as a primary component and at least Cr, Pt, and Nd. A process to produce the magnetic recording medium and a magnetic recording and reproducing apparatus are also disclosed.
摘要翻译： 一种具有非磁性基片的磁记录介质; 用于调节直接设置在其上的层的晶体取向的取向调节层; 易磁化轴大致垂直于基板定向的垂直磁性层; 并且公开了保护层。 垂直磁性层由含有Co作为主要成分并且至少包含Cr，Pt和Nd的材料形成。 还公开了制造磁记录介质的过程和磁记录和再现装置。
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6.发明授权公开(公告)号：US06805981B2
公开(公告)日：2004-10-19
申请号：US09902688
申请日：2001-07-12
申请人： Hideo Ogiwara , Takashi Hikosaka , Soichi Oikawa , Hiroshi Sakai , Kenji Shimizu
发明人： Hideo Ogiwara , Takashi Hikosaka , Soichi Oikawa , Hiroshi Sakai , Kenji Shimizu
IPC分类号： G11B566
CPC分类号： G11B5/66 , Y10S428/90
摘要： A perpendicular magnetic recording medium comprising a layer exhibiting a super paramagnetism is used as the underlying film to enable the recording medium to achieve a high density recording with a low noise.
摘要翻译： 使用包含表现出超顺磁性的层的垂直磁记录介质作为底层膜，使得记录介质能够实现低噪声的高密度记录。
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7.发明授权公开(公告)号：US06677061B2
公开(公告)日：2004-01-13
申请号：US10152675
申请日：2002-05-23
申请人： Kenji Shimizu , Akira Sakawaki , Hiroshi Sakai
发明人： Kenji Shimizu , Akira Sakawaki , Hiroshi Sakai
IPC分类号： G11B566
CPC分类号： G11B5/667 , G11B5/7325 , G11B5/8404 , Y10S428/90
摘要： A magnetic recording medium exhibiting excellent recording and reproduction characteristics is disclosed. A magnetic recording medium includes a non-magnetic substrate 1; a soft magnetic undercoat film 2; an orientation-regulating film 3; a perpendicular magnetic film 4; and a protective film 5, the films being formed on the substrate 1. The soft magnetic undercoat film 2 contains a material represented by the following composition: aFe-bCo-cM-dX1-fN where M is one or more elements selected from Ti, Zr, Nb, Hf, Ta, V, and Mo; X1 is one or more elements selected from Cr, Ga, Al, Si, and Ni; and a, b, c, d, and f represent atomic percentages and satisfy the following relations: 60≦a+b≦90, 30≦a≦90, 5≦c≦20, 0.1≦d≦7, and 3≦f≦30.
摘要翻译： 公开了一种表现出良好记录和再现特性的磁记录介质。 磁记录介质包括非磁性基板1; 软磁性底涂膜2; 取向调节膜3; 垂直磁性膜4; 和保护膜5，膜形成在基板1上。软磁性底涂层2含有由以下组成表示的材料：其中M是选自Ti，Zr，Nb，Hf，Ta，V中的一种或多种元素 ，和Mo X1是选自Cr，Ga，Al，Si和Ni中的一种或多种元素; 和a，b，c，d和f表示原子百分数，并满足以下关系：60 <= a + b <= 90,30 <= a <= 90,5 <= c <= 20,0.1 <= d <= 7，3 <= F＆LE; 30。
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公开(公告)号：US07252896B2
公开(公告)日：2007-08-07
申请号：US10788259
申请日：2004-02-27
申请人： Futoshi Nakamura , Takashi Hikosaka , Soichi Oikawa , Takeshi Iwasaki , Tomoyuki Maeda , Hiroshi Sakai , Kenji Shimizu , Akira Sakawaki
发明人： Futoshi Nakamura , Takashi Hikosaka , Soichi Oikawa , Takeshi Iwasaki , Tomoyuki Maeda , Hiroshi Sakai , Kenji Shimizu , Akira Sakawaki
IPC分类号： G11B5/66
CPC分类号： G11B5/732 , G11B5/667 , G11B5/7325
摘要： An orientation control layer having a granular structure is formed between a substrate and magnetic recording layer, contains a base material and grains dispersed in the base material, and having a thickness smaller than a grain size of the grains.
摘要翻译： 具有颗粒结构的取向控制层形成在基板和磁记录层之间，包含分散在基材中的基材和颗粒，其厚度小于晶粒的晶粒尺寸。
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9.发明申请公开(公告)号：US20060204791A1
公开(公告)日：2006-09-14
申请号：US10552445
申请日：2004-04-07
申请人： Akira Sakawaki , Kenji Shimizu , Kazuo Kobayashi , Hiroshi Sakai , Soichi Oikawa , Takeshi Iwasaki , Tomoyuki Maeda , Futoshi Nakamura
发明人： Akira Sakawaki , Kenji Shimizu , Kazuo Kobayashi , Hiroshi Sakai , Soichi Oikawa , Takeshi Iwasaki , Tomoyuki Maeda , Futoshi Nakamura
摘要： A magnetic recording medium which is provided on a nonmagnetic substrate 1 with at least an orientation-controlling layer 3 for controlling the orientation of a layer formed directly thereon, a perpendicularly magnetic layer 4 having an easily magnetizing axis oriented mainly perpendicularly relative to the nonmagnetic substrate 1, and a protective layer 5 and characterized in that the perpendicularly magnetic layer 4 includes two or more magnetic layers, that at least one of the magnetic layers is a layer 4a having Co as a main component and containing Pt as well and containing an oxide and that at least another of the magnetic layers is a layer 4b having Co as a main component and containing Cr as well and containing no oxide.
摘要翻译： 一种磁性记录介质，其设置在至少具有用于控制直接形成的层的取向的取向控制层3的非磁性基板1上，具有相对于非磁性基板主要垂直取向的易磁化轴的垂直磁性层4 1和保护层5，其特征在于，垂直磁性层4包括两个或更多个磁性层，至少一个磁性层是具有Co作为主要成分并且含有Pt的层4a，并且含有 并且至少另一个磁性层是具有Co作为主要成分并且含有Cr并且不含氧化物的层4b。
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10.发明授权公开(公告)号：US07083870B2
公开(公告)日：2006-08-01
申请号：US10617822
申请日：2003-07-14
CPC分类号： G11B5/667 , G11B5/65 , G11B5/7325 , G11B2005/0029
摘要： A magnetic recording medium includes a nonmagnetic substrate on which is provided at least a soft magnetic under-film, an orientation control film that controls an orientation of a film directly above, a perpendicular magnetic recording film having an axis of easy magnetization oriented to be mainly perpendicular to the substrate and a protective film, wherein the orientation control film has a material composition forming a C11b structure. The magnetic recording medium is manufactured by a method including carrying out, in order, at least a step of forming a soft magnetic under-film on a nonmagnetic substrate, a step of forming an orientation control film that controls an orientation of a film directly above, a step of forming a perpendicular magnetic recording film having an axis of easy magnetization oriented to be mainly perpendicular to the substrate, and a step of forming a protective film. A magnetic recording and reproduction apparatus includes the magnetic recording medium and a magnetic head that records and reproduces information on the magnetic recording medium, wherein the magnetic head is a magnetic monopole head.
摘要翻译： 磁记录介质包括至少设置有软磁性底膜的非磁性基板，控制正上方的膜的取向的取向控制膜，具有容易磁化的轴的垂直磁记录膜主要取向为 垂直于基底和保护膜，其中取向控制膜具有形成C 11 B 17结构的材料组合物。 该磁记录介质是通过以下方法制造的，该方法包括以下步骤：至少在非磁性基板上形成软磁性底膜的步骤，形成控制膜直接定向的取向控制膜的步骤 形成具有易于磁化的轴取向为主要垂直于基板的垂直磁记录膜的步骤和形成保护膜的步骤。 磁记录和再现装置包括磁记录介质和在磁记录介质上记录和再现信息的磁头，其中磁头是磁单极头。
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