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1. 发明授权

US4762742A Perpendicular magnetic recording medium 失效
标题翻译：垂直磁记录介质
公开(公告)号：US4762742A
公开(公告)日：1988-08-09
申请号：US945549
申请日：1986-12-23
申请人： Tomiya Sonoda , Takashi Hikosaka , Hiroki Nakamura
发明人： Tomiya Sonoda , Takashi Hikosaka , Hiroki Nakamura
IPC分类号： G11B5/66 , G11B5/64 , G11B5/65 , G11B5/72 , G11B5/82
CPC分类号： G11B5/64 , G11B5/72 , Y10S428/90 , Y10T428/24355
摘要： A perpendicular magnetic recording medium comprises a base having a main surface and form, and a magnetic layer formed on the main surface, and having a recording surface, formed with a number of fine projections, and a susceptible axis substantially perpendicular to the recording surface. The projections are distributed so that the difference between a height level corresponding to an area ratio of 1.0%, obtained when the projections are cut by an imaginary plane parallel to the recording surface, and another height level corresponding to an area ratio of 99.0%, obtained in a like manner, ranges from 40 to 600 .ANG.. A protective film of a substantially uniform thickness is formed on the recording surface of the magnetic layer.
摘要翻译：垂直磁记录介质包括具有主表面和形状的基底和形成在主表面上的磁性层，并且具有形成有多个细小突起的记录表面和基本上垂直于记录表面的易感轴。这些突起被分布，使得当突起被平行于记录表面的虚拟平面切割时获得的与面积比为1.0％的高度水平之差，以及与面积比为99.0％相对应的另一高度水平，以类似的方式获得，范围为40至600安培。在磁性层的记录表面上形成厚度基本均匀的保护膜。

2. 发明授权

US07289298B2 Perpendicular magnetic recording medium, method for manufacturing the same, and magnetic recording/reproducing apparatus 失效
标题翻译：垂直磁记录介质，其制造方法和磁记录/再现装置
公开(公告)号：US07289298B2
公开(公告)日：2007-10-30
申请号：US10793950
申请日：2004-03-08
申请人： Tomoyuki Maeda , Takashi Hikosaka , Futoshi Nakamura , Takeshi Iwasaki , Hiroshi Sakai , Kenji Shimizu , Akira Sakawaki
发明人： Tomoyuki Maeda , Takashi Hikosaka , Futoshi Nakamura , Takeshi Iwasaki , Hiroshi Sakai , Kenji Shimizu , Akira Sakawaki
IPC分类号： G11B5/66
CPC分类号： G11B5/65 , G11B5/653 , G11B5/656
摘要： Disclosed is a magnetic recording medium which includes a substrate, an underlayer, and a perpendicular magnetic recording layer, and in which this perpendicular magnetic recording layer contains magnetic crystal grains and a matrix surrounding the magnetic crystal grains, and the matrix contains an element selected from Zn, Cd, Al, Ga, and In, and a component selected from P, As, Sb, S, Se, and Te.
摘要翻译：公开了一种磁记录介质，其包括基板，底层和垂直磁记录层，并且其中该垂直磁记录层包含磁性晶粒和围绕磁性晶粒的基体，并且该基体包含选自以下的元素： Zn，Cd，Al，Ga和In以及选自P，As，Sb，S，Se和Te的成分。

3. 发明申请

US20070111035A1 Magnetic recording medium, method of producing the same and magnetic recording and reproducing device 审中-公开
标题翻译：磁记录介质及其制造方法及磁记录再生装置
公开(公告)号：US20070111035A1
公开(公告)日：2007-05-17
申请号：US11594769
申请日：2006-11-09
申请人： Kenji Shimizu , Hiroshi Sakai , Takashi Hikosaka , Futoshi Nakamura
发明人： Kenji Shimizu , Hiroshi Sakai , Takashi Hikosaka , Futoshi Nakamura
IPC分类号： G11B5/66
CPC分类号： G11B5/667 , G11B5/66
摘要： The present invention aims to provide a magnetic recording medium, a method for producing the same, and a magnetic recording and reproducing device which can prevent spike noise and improve the error rate. The present invention provides a magnetic recording medium, a method for producing the same, and a magnetic recording and reproducing device comprising at least one nonmagnetic substrate, a soft magnetic underlayer 2, an orientation control layer to control the orientation of the layer formed directly above the same, and a perpendicular magnetic layer having an axis of easy magnetization which is oriented mainly perpendicularly to the nonmagnetic substrate, and the soft magnetic underlayer 2 is formed with a multilayer structure having soft magnetic layers 21A and 21B, and one or more separation layers 22 interposed between the soft magnetic layers, and at least one of the soft magnetic layers 21A and 21B comprises a material with a structure having no magnetic domain walls.
摘要翻译：本发明旨在提供一种磁记录介质及其制造方法，以及能够防止尖峰噪声并提高误码率的磁记录和再现装置。本发明提供一种磁记录介质及其制造方法，以及包括至少一个非磁性基底，软磁性底层2，取向控制层以控制直接在其上形成的层的取向的磁记录和再现装置以及具有主要垂直于非磁性基板取向的容易磁化轴的垂直磁性层，并且软磁性底层2形成有具有软磁性层21A和21B的多层结构，以及一个或多个介于软磁性层之间的分离层22以及软磁性层21A和21B中的至少一个包括具有不具有磁畴壁的结构的材料。

4. 发明授权

US07105239B2 Perpendicular magnetic recording medium and magnetic recording/reproducing apparatus using the same 失效
公开(公告)号：US07105239B2
公开(公告)日：2006-09-12
申请号：US10234856
申请日：2002-09-05
申请人： Soichi Oikawa , Takashi Hikosaka , Futoshi Nakamura , Takeshi Iwasaki , Hiroshi Sakai , Akira Sakawaki , Kenji Shimizu
发明人： Soichi Oikawa , Takashi Hikosaka , Futoshi Nakamura , Takeshi Iwasaki , Hiroshi Sakai , Akira Sakawaki , Kenji Shimizu
IPC分类号： G11B5/66 , G11B5/70
CPC分类号： G11B5/66
摘要： In a magnetic recording medium, a longitudinal hard magnetic layer, interlayer, longitudinal soft magnetic layer, and magnetic recording layer are multilayered on a substrate. The interlayer is one of a magnetic layer having saturation magnetization smaller than that of the longitudinal hard magnetic layer, a nonmagnetic layer mainly containing cobalt or ruthenium or having a thickness of 0.5 nm or less, and an oxide layer of the longitudinal hard magnetic layer.

5. 发明授权

US06723458B2 Magnetic recording medium, method of manufacture therefor, and magnetic read/write apparatus 失效
标题翻译：磁记录介质，其制造方法和磁读/写装置
公开(公告)号：US06723458B2
公开(公告)日：2004-04-20
申请号：US10218570
申请日：2002-08-15
申请人： Kenji Shimizu , Akira Sakawaki , Hui Yang , Hiro Mochizuki , Hiroshi Sakai , Takashi Hikosaka , Futoshi Nakamura
发明人： Kenji Shimizu , Akira Sakawaki , Hui Yang , Hiro Mochizuki , Hiroshi Sakai , Takashi Hikosaka , Futoshi Nakamura
IPC分类号： G11B566
CPC分类号： G11B5/667 , G11B5/656 , G11B5/7325 , Y10S428/90
摘要： A magnetic recording medium that is capable of recording and reading back information at a higher density by improving the read/write characteristics and thermal stability, a method of manufacture therefor, and a magnetic read/write apparatus are provided. This magnetic recording medium, comprises an orientation control film that controls the orientation of a film provided directly thereabove, a perpendicular magnetic film, of which the 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 perpendicular magnetic film is made of a material which contains Co, Cr, Pt and Cu, the Cr content being 16 at % to 24 at % and the Cu content being 0.1 at % to 4 at %, and a coercive force (Hc) of the perpendicular magnetic film being at least 3000 (Oe), negative nucleation field (−Hn) being 0 (Oe) to 2500 (Oe), and a ratio of residual magnetization (Mr) to saturation magnetization (Ms) being at least 0.85.
摘要翻译：提供能够通过改善读/写特性和热稳定性而以更高密度记录和读回信息的磁记录介质，其制造方法和磁读/写装置。这种磁记录介质包括控制直接在其上设置的膜的取向的取向控制膜，容易磁化轴垂直于非磁性基板的垂直磁性膜和保护膜，其中设置在非磁性基板上，其中垂直磁性膜由含有Co，Cr，Pt和Cu的材料制成，Cr含量为16at％至24at％，Cu含量为0.1at％至4 （Oe），负成核场（-Hn）为0（Oe）〜2500（Oe），剩余磁化强度（Mr））为0以上，垂直磁性膜的矫顽力（Hc）为3000 饱和磁化强度（Ms）至少为0.85。

6. 发明授权

US06682826B2 Magnetic recording medium, method of manufacturing therefor, and magnetic read/write apparatus 有权
标题翻译：磁记录介质，其制造方法和磁读/写装置
公开(公告)号：US06682826B2
公开(公告)日：2004-01-27
申请号：US10202096
申请日：2002-07-25
申请人： Kenji Shimizu , Akira Sakawaki , Hiro Mochizuki , Hiroshi Sakai , Soichi Oikawa , Takashi Hikosaka
发明人： Kenji Shimizu , Akira Sakawaki , Hiro Mochizuki , Hiroshi Sakai , Soichi Oikawa , Takashi Hikosaka
IPC分类号： G11B5667
CPC分类号： G11B5/667 , G11B5/7325 , G11B2005/0005 , G11B2005/001 , G11B2005/0029 , Y10T428/12806 , Y10T428/12826 , Y10T428/12847 , Y10T428/12854 , Y10T428/12861 , Y10T428/24942 , Y10T428/31
摘要： The present invention provides a magnetic recording medium having excellent magnetic read/write characteristics and thermal stability, a method of manufacturing therefor, and a magnetic read/write apparatus. The magnetic recording medium comprises a soft magnetic undercoat film, an orientation control film, a perpendicular magnetization film, and a protective film, that are formed on a non-magnetic substrate, wherein the orientation control film has an hcp structure and, at the same time, &Dgr;&thgr;50 of the (0002) orientation plane is set within a range from 3 to 10 degrees and a difference (&Dgr;&thgr;50 (mag)−&Dgr;&thgr;50 (ori)) between &Dgr;&thgr;50 (ori) of the orientation control film and &Dgr;&thgr;50 (mag) of the perpendicular magnetization film is set within a range from 1 to 8 degrees.
摘要翻译：本发明提供了具有优异的磁读/写特性和热稳定性的磁记录介质，其制造方法和磁读/写装置。磁记录介质包括形成在非磁性基板上的软磁性底涂膜，取向控制膜，垂直磁化膜和保护膜，其中取向控制膜具有hcp结构，并且在相同时间，（0002）取向平面的Deltatheta50设定在3至10度的范围内，并且取向控制膜的Deltatheta50（ori）和Deltatheta50（mag）之间的差（Deltatheta50（mag）-Deltatheta50（ori）））垂直磁化膜设定在1〜8度的范围内。

7. 发明授权

US5981054A Magnetic recording medium and method for manufacturing the same 失效
标题翻译：磁记录介质及其制造方法
公开(公告)号：US5981054A
公开(公告)日：1999-11-09
申请号：US897677
申请日：1997-07-21
申请人： Takashi Hikosaka , Tsutomu Tanaka , Yoichiro Tanaka , Katsutaro Ichihara , Keiichiro Yusu , Akira Kikitsu
发明人： Takashi Hikosaka , Tsutomu Tanaka , Yoichiro Tanaka , Katsutaro Ichihara , Keiichiro Yusu , Akira Kikitsu
IPC分类号： G11B5/64 , G11B5/855 , G11B5/66
CPC分类号： G11B5/65 , G11B5/64 , G11B5/656 , G11B5/855 , Y10S428/90 , Y10T428/256 , Y10T428/2991
摘要： A magnetic recording medium comprising a substrate and a magnetic film formed on the substrate, the magnetic film including magnetic crystal grains in a non-magnetic matrix and satisfying the condition given below:d.sup.2 .multidot.t.multidot.Ir/(v.multidot.Isb).gtoreq.0.75wheret: a thickness of the magnetic film;Ir: a remanent magnetization moment of the magnetic film;d: an average particle size of the magnetic crystal grains in an intra-film direction of the magnetic film; andv.multidot.Isb: an activated magnetization moment of the magnetic film.
摘要翻译：一种磁性记录介质，包括在基板上形成的基板和磁性膜，该磁性膜包括非磁性矩阵中的磁性晶粒并且满足以下条件：d2xtxIr /（vxIsb）> / = 0.75其中t：厚度的磁膜; Ir：磁膜的剩磁化力矩; d：磁性膜的膜内方向的磁性晶粒的平均粒径; 和vxIsb：磁膜的激活的磁化力矩。

8. 发明授权

US07166376B2 Magnetic recording medium including a high-magnetostriction layer and magnetic recording/reproducing apparatus 有权
标题翻译：包括高磁致伸缩层和磁记录/再现装置的磁记录介质
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
CPC分类号： G11B5/66 , G11B5/653 , G11B5/656
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。

9. 发明授权

US07138194B2 Magnetic recording medium, method of manufacture therefor, and magnetic read/write apparatus 失效
标题翻译：磁记录介质，其制造方法和磁读/写装置
公开(公告)号：US07138194B2
公开(公告)日：2006-11-21
申请号：US10630796
申请日：2003-07-31
申请人： Kenji Shimizu , Akira Sakawaki , Hiroshi Sakai , Takashi Hikosaka , Soichi Oikawa
发明人： Kenji Shimizu , Akira Sakawaki , Hiroshi Sakai , Takashi Hikosaka , Soichi Oikawa
IPC分类号： G11B5/66 , G11B5/70
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。

10. 发明授权

US06805981B2 Perpendicular magnetic recording medium and perpendicular magnetic recording-reproducing apparatus 失效
标题翻译：垂直磁记录介质和垂直磁记录再现装置
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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