公开(公告)号：US20040106010A1

公开(公告)日：2004-06-03

申请号：US10701488

申请日：2003-11-06

Applicant: KABUSHIKI KAISHA TOSHIBA ,  SHOWA DENKO K,K,

Inventor： Takeshi Iwasaki ,  Takashi Hikosaka ,  Soichi Oikawa ,  Futoshi Nakamura ,  Hiroshi Sakai ,  Kenji Shimizu ,  Akira Sakawaki

IPC: A41G009/00

CPC classification number: G11B5/7325 ,  G11B5/656 ,  G11B5/84

Abstract: Disclosed is a perpendicular magnetic recording medium comprising a perpendicular magnetic layer formed at 280 to 450null C. by using a magnetic layer-forming material containing at least one additive component selected from the group consisting of cobalt, platinum, chromium, molybdenum and tungsten, the magnetic perpendicular layer being constructed to include a plurality of magnetic crystal grains separated from each other by crystal grain boundaries and providing the perpendicular magnetic layer in which the additive component is segregated in the crystal grain boundaries.

Abstract translation: 公开了一种垂直磁记录介质，其包括通过使用含有选自钴，铂，铬，钼和钨中的至少一种添加剂成分的磁性层形成材料在280至450℃形成的垂直磁性层， 磁性垂直层被构造为包括通过晶粒边界彼此分离的多个磁性晶粒，并且提供其中添加成分在晶粒边界中分离的垂直磁性层。

公开(公告)号：US20040137277A1

公开(公告)日：2004-07-15

申请号：US10626837

申请日：2003-07-25

Applicant: KABUSHIKI KAISHA TOSHIBA ,  SHOWA DENKO K.K.

Inventor： Takeshi Iwasaki ,  Takashi Hikosaka ,  Soichi Oikawa ,  Futoshi Nakamura ,  Hiroshi Sakai ,  Kenji Shimizu ,  Akira Sakawaki

IPC: G11B005/66

CPC classification number: G11B5/66 ,  G11B5/656

Abstract: A perpendicular magnetic recording medium includes a magnetic recording layer stacked on a substrate and having a first perpendicular magnetic recording layer containing cobalt, and a second perpendicular magnetic recording layer mainly containing a crystalline alloy which contains a rare earth element and a transition metal.

Abstract translation: 垂直磁记录介质包括堆叠在基板上并具有包含钴的第一垂直磁记录层的磁记录层和主要含有稀土元素和过渡金属的结晶合金的第二垂直磁记录层。

公开(公告)号：US20040058197A1

公开(公告)日：2004-03-25

申请号：US10663914

申请日：2003-09-17

Applicant: KABUSHIKI KAISHA TOSHIBA

Inventor： Futoshi Nakamura ,  Takashi Hikosaka ,  Soichi Oikawa ,  Hideo Ogiwara

IPC: G11B005/66

CPC classification number: G11B5/66 ,  G11B2005/0029 ,  Y10S428/90 ,  Y10T428/24942 ,  Y10T428/265

Abstract: A soft magnetic laminate layer is arranged between a nonmagnetic substrate and a perpendicular magnetic recording layer so as to provide a perpendicular magnetic recording medium low in noise and capable of a high density recording. The soft magnetic laminate layer comprises a soft magnetic layer having a thickness not larger than 500 null and a nonmagnetic layer, comprises a first soft magnetic layer and a second soft magnetic layer differing from the first soft magnetic layer in the crystal structure, or comprises a layer of a granular structure consisting of magnetic particles and a nonmagnetic matrix and a soft magnetic layer.

公开(公告)号：US20040191466A1

公开(公告)日：2004-09-30

申请号：US10801563

申请日：2004-03-17

Applicant: KABUSHIKI KAISHA TOSHIBA ,  SHOWA DENKO K.K.

Inventor： Takeshi Iwasaki ,  Takashi Hikosaka ,  Soichi Oikawa ,  Futoshi Nakamura ,  Tomoyuki Maeda ,  Hiroshi Sakai ,  Kenji Shimizu ,  Akira Sakawaki

IPC: B32B001/00

CPC classification number: G11B5/7325 ,  G11B5/656

Abstract: Disclosed is a perpendicular magnetic recording medium in which an undercoating layer having crystal grains and a grain boundary material containing a carbide or boride is formed below a perpendicular magnetic recording layer, and another undercoating layer containing one of elements forming the crystal grains is formed below the aforementioned undercoating layer, and which can perform highnulldensity recording by further decreasing the grain size of the perpendicular magnetic recording layer.

Abstract translation: 公开了一种垂直磁记录介质，其中具有晶粒的底涂层和含有碳化物或硼化物的晶界物质形成在垂直磁记录层的下方，并且在其下方形成另一个含有形成晶粒的元素的底涂层 通过进一步降低垂直磁记录层的晶粒尺寸，可以进行高密度记录。

公开(公告)号：US20040053078A1

公开(公告)日：2004-03-18

申请号：US10607570

申请日：2003-06-27

Applicant: Kabushiki Kaisha Toshiba

Inventor： Akira Kikitsu ,  Junichi Akiyama ,  Tadashi Kai ,  Toshihiko Nagase ,  Tomoyuki Maeda ,  Hisanori Aikawa ,  Soichi Oikawa ,  Yoichiro Tanaka

IPC: G11B005/66

CPC classification number: G11B5/66

Abstract: This invention uses a perpendicular magnetic recording medium in which first and second magnetic recording layers are coupled by antimagnetic exchange coupling, or a longitudinal magnetic recording medium in which three or more predetermined interlayers are formed between first and second magnetic recording layers, and these layers are coupled by antimagnetic exchange coupling.

Abstract translation: 本发明使用垂直磁记录介质，其中第一和第二磁记录层通过防磁交换耦合耦合，或纵向磁记录介质，其中在第一和第二磁记录层之间形成三个或更多个预定的中间层，并且这些层是 通过抗磁交换耦合耦合。

公开(公告)号：US20040001975A1

公开(公告)日：2004-01-01

申请号：US10454550

申请日：2003-06-05

Applicant: KABUSHIKI KAISHA TOSHIBA ,  SHOWA DENKO K.K.

Inventor： Takashi Hikosaka ,  Takeshi Iwasaki ,  Futoshi Nakamura ,  Soichi Oikawa ,  Hiroshi Sakai ,  Kenji Shimizu ,  Akira Sakawaki

IPC: B32B003/00

CPC classification number: G11B5/667 ,  G11B5/00 ,  G11B5/7325 ,  G11B5/74 ,  G11B5/82 ,  G11B2005/001 ,  G11B2005/0029 ,  Y10T428/265

Abstract: A double layered perpendicular recording media having, between a soft magnetic layer and perpendicular magnetic recording layer, an alignment control layer containing an amorphous portion, a crystal size control layer, and an underlayer having one of a hexagonal closest packed structure and a face-centered cubic structure.

Abstract translation: 一种双层垂直记录介质，其在软磁层和垂直磁记录层之间具有包含非晶部分的取向控制层，晶体尺寸控制层和具有六边形最密堆积结构和面心的 立方结构。

公开(公告)号：US20020177012A1

公开(公告)日：2002-11-28

申请号：US09917840

申请日：2001-07-31

Applicant: KABUSHIKI KAISHA TOSHIBA

Inventor： Takashi Hikosaka ,  Futoshi Nakamura ,  Soichi Oikawa ,  Hiroshi Sakai ,  Kenji Shimizu

IPC: G11B005/667

CPC classification number: G11B5/00 ,  G11B5/66 ,  G11B2005/0029 ,  Y10S428/90 ,  Y10T428/12465 ,  Y10T428/12861 ,  Y10T428/12937 ,  Y10T428/265

Abstract: Disclosed is a magnetic recording medium having a laminate structure comprising at least a substrate, a Co alloy bias layer, a soft magnetic layer, and a magnetic recording layer. The direction of residual magnetization of the Co alloy bias layer faces one direction of its radial direction. Also, the perpendicular magnetic recording medium satisfies the relationship given below: Mssoftnull(tsoftnull40 nm)>Mssoftnull40 nmnullMsbiasnulltbias where, tbias denotes the thickness of the cobalt alloy bias layer, Msbias denotes the saturation magnetization of the cobalt alloy bias layer, tsoft denotes the thickness of the soft magnetic layer, which falls within a range of between 40 nm and 200 nm, and Mssoft denotes the saturation magnetization of the soft magnetic layer.

Abstract translation: 公开了具有至少包括基板，Co合金偏压层，软磁性层和磁记录层的叠层结构的磁记录介质。 Co合金偏置层的剩余磁化方向面向其径向方向的一个方向。 此外，垂直磁记录介质满足以下关系：<片段lvl =“0”> Mssoftx（tsoft-40nm）> Mssoftx40nm + Msbiasxtbias 其中， 表示钴合金偏置层的厚度，Msbias表示钴合金偏置层的饱和磁化强度，tsoft表示软磁性层的厚度，其在40nm〜200nm的范围内，Mssoft表示 软磁层的饱和磁化强度。

公开(公告)号：US20040224184A1

公开(公告)日：2004-11-11

申请号：US10786611

申请日：2004-02-26

Applicant: KABUSHIKI KAISHA TOSHIBA ,  SHOWA DENKO K.K.

Inventor： Takashi Hikosaka ,  Futoshi Nakamura ,  Soichi Oikawa ,  Takeshi Iwasaki ,  Tomoyuki Maeda ,  Hiroshi Sakai ,  Kenji Shimizu ,  Akira Sakawaki

IPC: G11B005/66

CPC classification number: G11B5/66 ,  G11B5/653 ,  G11B5/656

Abstract: 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.

Abstract translation: 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。

公开(公告)号：US20040219329A1

公开(公告)日：2004-11-04

申请号：US10791277

申请日：2004-03-03

Applicant: KABUSHIKI KAISHA TOSHIBA ,  SHOWA DENKO K.K.

Inventor： Soichi Oikawa ,  Takeshi Iwasaki ,  Hiroshi Sakai ,  Akira Sakawaki ,  Kenji Shimizu

IPC: B32B003/02

CPC classification number: G11B5/667 ,  G11B5/656 ,  G11B5/66 ,  G11B5/7325

Abstract: Disclosed is a perpendicular magnetic recording medium including a nonmagnetic substrate, a multilayered underlayer which includes a ferromagnetic underlayer having a perpendicular coercive force of 39.5 kA/m or less and a weakly magnetic underlayer having a saturation magnetization Ms of 50 to 150 emu/cc, and a perpendicular magnetic recording layer.

Abstract translation: 公开了一种包括非磁性基板的垂直磁记录介质，包括垂直矫顽力为39.5kA / m以下的铁磁性底层和饱和磁化强度Ms为50〜150emu / cc的弱磁性底层的多层底层， 和垂直磁记录层。

公开(公告)号：US20040191576A1

公开(公告)日：2004-09-30

申请号：US10781906

申请日：2004-02-20

Applicant: SHOWA DENKO K.K. ,  KABUSHIKI KAISHA TOSHIBA

Inventor： Kenji Shimizu ,  Akira Sakawaki ,  Hiroshi Sakai ,  Takashi Hikosaka ,  Soichi Oikawa

IPC: B32B003/02

CPC classification number: G11B5/855 ,  G11B5/656 ,  G11B5/667 ,  G11B5/7325

Abstract: A magnetic recording medium comprising: on a non-magnetic substrate, at least a soft magnetic undercoat film comprising a soft magnetic material; an orientation control film for controlling an orientation of a film directly above; a perpendicular magnetic film in which an axis of easy magnetization is oriented mainly perpendicularly with respect to the substrate; and a protection film, wherein the perpendicular magnetic film has a structure in which a large number of magnetic grains are separated by a grain boundary layer, and an average separating distance between the magnetic grains along a straight line which connects centers of gravity of mutually neighboring magnetic grains is 1 nm or greater.

Abstract translation: 一种磁记录介质，包括：在非磁性基底上，至少包含软磁性材料的软磁性底涂层; 用于直接控制膜的取向的取向控制膜; 垂直磁性膜，其中容易磁化的轴主要相对于衬底垂直取向; 和保护膜，其中垂直磁性膜具有其中大量的磁性颗粒被晶界层分离的结构，以及沿着相互相邻的重心的直线的磁性颗粒之间的平均分离距离 磁性粒子为1nm以上。