公开(公告)号：US20070042227A1

公开(公告)日：2007-02-22

申请号：US10572780

申请日：2004-09-22

申请人： Takeshi Iwasaki ,  Soichi Oikawa ,  Futoshi Nakamura ,  Tomoyuki Maeda ,  Hiroshi Sakai ,  Akira Sakawaki ,  Kenji Shimizu

发明人： Takeshi Iwasaki ,  Soichi Oikawa ,  Futoshi Nakamura ,  Tomoyuki Maeda ,  Hiroshi Sakai ,  Akira Sakawaki ,  Kenji Shimizu

IPC分类号： G11B5/66

CPC分类号： G11B5/65 ,  G11B5/656 ,  G11B5/667 ,  G11B5/732 ,  G11B5/7325

摘要： To make possible high density recording by making the structure of the perpendicular magnetic recording layer finer. A perpendicular magnetic recording medium 10 includes at least a nonmagnetic under layer 2, a perpendicular magnetic layer 3, and a protective layer which are stacked on a nonmagnetic substrate 1, wherein the perpendicular magnetic layer includes ferromagnetic crystal grains and nonmagnetic crystal grain boundary regions, wherein the crystal grain boundary region includes at least two kinds of oxide.

摘要翻译： 通过使垂直磁记录层的结构更细，可以实现高密度记录。 垂直磁记录介质10至少包括层叠在非磁性基板1上的非磁性底层2，垂直磁性层3和保护层，其中垂直磁性层包括铁磁晶粒和非磁性晶粒边界区域， 其中所述晶界区包括至少两种氧化物。

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

IPC分类号： G11B5/82 ,  G11B5/66

CPC分类号： G11B5/656 ,  G11B5/65 ,  G11B5/66

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。

公开(公告)号：US07901803B2

公开(公告)日：2011-03-08

申请号：US10574573

申请日：2004-10-05

申请人： Tomoyuki Maeda ,  Soichi Oikawa ,  Takeshi Iwasaki ,  Futoshi Nakamura ,  Hiroshi Sakai ,  Kenji Shimizu ,  Akira Sakawaki

发明人： Tomoyuki Maeda ,  Soichi Oikawa ,  Takeshi Iwasaki ,  Futoshi Nakamura ,  Hiroshi Sakai ,  Kenji Shimizu ,  Akira Sakawaki

IPC分类号： G11B5/66 ,  G11B5/738

CPC分类号： G11B5/65 ,  G11B5/656 ,  G11B5/7325

摘要： A perpendicular magnetic recording medium includes: a substrate; at least one underlayer formed above the substrate; and a perpendicular magnetic recording layer formed above the at least one underlayer, an easy magnetization axis of the perpendicular magnetic recording layer being oriented perpendicular to the substrate, the perpendicular magnetic recording layer including magnetic crystal particles and grain boundaries surrounding the magnetic crystal particles, wherein the grain boundaries contain an oxide of silicon and at least one element selected from the group consisting of Li, Na, K, Rb, Cs, Ca, Sr, and Ba, and the ratio of a total amount of substance of Si, Li, Na, K, Rb, Cs, Ca, Sr, and Ba in the perpendicular magnetic recording layer is no less than 1 mol % and no more than 20 mol %.

摘要翻译： 垂直磁记录介质包括：基板; 至少一个底层形成在所述基底上; 以及形成在所述至少一个底层上方的垂直磁记录层，所述垂直磁记录层的易磁化轴垂直于所述衬底取向，所述垂直磁记录层包括磁性结晶颗粒和包围所述磁性结晶颗粒的晶界，其中 晶界包含硅的氧化物和选自Li，Na，K，Rb，Cs，Ca，Sr和Ba中的至少一种元素，并且Si，Li， 垂直磁记录层中的Na，K，Rb，Cs，Ca，Sr和Ba不小于1mol％且不大于20mol％。

公开(公告)号：US07867638B2

公开(公告)日：2011-01-11

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

IPC分类号： G11B5/66 ,  G11B5/673 ,  C23C16/40

CPC分类号： G11B5/656 ,  G11B5/65 ,  G11B5/66

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。

公开(公告)号：US07601445B2

公开(公告)日：2009-10-13

申请号：US10572780

申请日：2004-09-22

申请人： Takeshi Iwasaki ,  Soichi Oikawa ,  Futoshi Nakamura ,  Tomoyuki Maeda ,  Hiroshi Sakai ,  Akira Sakawaki ,  Kenji Shimizu

发明人： Takeshi Iwasaki ,  Soichi Oikawa ,  Futoshi Nakamura ,  Tomoyuki Maeda ,  Hiroshi Sakai ,  Akira Sakawaki ,  Kenji Shimizu

IPC分类号： G11B5/65

CPC分类号： G11B5/65 ,  G11B5/656 ,  G11B5/667 ,  G11B5/732 ,  G11B5/7325

摘要： To make possible high density recording by making the structure of the perpendicular magnetic recording layer finer. A perpendicular magnetic recording medium 10 includes at least a nonmagnetic under layer 2, a perpendicular magnetic layer 3, and a protective layer which are stacked on a nonmagnetic substrate 1, wherein the perpendicular magnetic layer includes ferromagnetic crystal grains and nonmagnetic crystal grain boundary regions, wherein the crystal grain boundary region includes at least two kinds of oxide.

摘要翻译： 通过使垂直磁记录层的结构更细，可以实现高密度记录。 垂直磁记录介质10至少包括层叠在非磁性基板1上的非磁性底层2，垂直磁性层3和保护层，其中垂直磁性层包括铁磁晶粒和非磁性晶粒边界区域， 其中所述晶界区包括至少两种氧化物。

公开(公告)号：US07470474B2

公开(公告)日：2008-12-30

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

IPC分类号： G11B5/66 ,  G11B5/673 ,  C23C16/40

CPC分类号： G11B5/656 ,  G11B5/65 ,  G11B5/66

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并且含有氧化物的层4a 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。

公开(公告)号：US07781081B2

公开(公告)日：2010-08-24

申请号：US10583951

申请日：2004-12-24

申请人： Tomoyuki Maeda ,  Soichi Oikawa ,  Takeshi Iwasaki ,  Futoshi Nakamura ,  Hiroshi Sakai ,  Kenji Shimizu ,  Akira Sakawaki

发明人： Tomoyuki Maeda ,  Soichi Oikawa ,  Takeshi Iwasaki ,  Futoshi Nakamura ,  Hiroshi Sakai ,  Kenji Shimizu ,  Akira Sakawaki

IPC分类号： G11B5/66

CPC分类号： G11B5/7325 ,  C23C14/0688 ,  C23C14/185 ,  G11B5/65 ,  G11B5/656 ,  G11B5/712 ,  G11B5/85

摘要： A magnetic recording medium 62 wherein a substrate 11, undercoating layers 13 and 14 formed on the substrate 11, and a magnetic recording layer 15, which include the magnetic crystal grain and the grain boundary field which encloses magnetic crystal grains, are included. The grain boundary field includes Ti oxide, and the ratio of the substance amount of the Ti oxide in the magnetic recording layer 15 is 5 mol % or more and 15 mol % or less, and the Ti oxide includes at least TiO and/or Ti2O3s.

摘要翻译： 包括磁记录介质62，其中包括形成在基板11上的基板11，底涂层13和14以及磁记录层15，其包括磁晶粒和包围磁晶粒的晶界。 晶界包括Ti氧化物，磁记录层15中的Ti氧化物的物质的比例为5摩尔％以上且15摩尔％以下，Ti氧化物至少包含TiO和/或Ti 2 O 3 。

公开(公告)号：US20070148500A1

公开(公告)日：2007-06-28

申请号：US10583951

申请日：2004-12-24

申请人： Tomoyuki Maeda ,  Soichi Oikawa ,  Takeshi Iwasaki ,  Futoshi Nakamura ,  Hiroshi Sakai ,  Kenji Shimizu ,  Akira Sakawaki

发明人： Tomoyuki Maeda ,  Soichi Oikawa ,  Takeshi Iwasaki ,  Futoshi Nakamura ,  Hiroshi Sakai ,  Kenji Shimizu ,  Akira Sakawaki

IPC分类号： G11B5/65 ,  G11B5/66 ,  C23C14/00

CPC分类号： G11B5/7325 ,  C23C14/0688 ,  C23C14/185 ,  G11B5/65 ,  G11B5/656 ,  G11B5/712 ,  G11B5/85

摘要： A magnetic recording medium 62 wherein a substrate 11, undercoating layers 13 and 14 formed on the substrate 11, and a magnetic recording layer 15, which include the magnetic crystal grain and the grain boundary field which encloses magnetic crystal grains, are included. The grain boundary field includes Ti oxide, and the ratio of the substance amount of the Ti oxide in the magnetic recording layer 15 is 5 mol % or more and 15 mol % or less, and the Ti oxide includes at least TiO and/or Ti2O3s.

摘要翻译： 包括磁记录介质62，其中包括形成在基板11上的基板11，底涂层13和14以及磁记录层15，其包括磁晶粒和包围磁晶粒的晶界。 晶界包含Ti氧化物，磁记录层15中的Ti氧化物的物质的比例为5摩尔％以上且15摩尔％以下，Ti氧化物至少包含TiO和/或Ti 2＆lt; 3＆gt; 3＆lt; 3＆gt;

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。

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。