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1. 发明授权

US07348077B2 Magnetic recording medium and magnetic recording apparatus 失效
标题翻译：磁记录介质和磁记录装置
公开(公告)号：US07348077B2
公开(公告)日：2008-03-25
申请号：US10930755
申请日：2004-09-01
申请人： Enji Fujita , Hideaki Yamanaka , Tsuyoshi Onuma , Satoshi Matsunuma , Akira Yano , Tetsunori Koda , Katsusuke Shimazaki
发明人： Enji Fujita , Hideaki Yamanaka , Tsuyoshi Onuma , Satoshi Matsunuma , Akira Yano , Tetsunori Koda , Katsusuke Shimazaki
IPC分类号： G11B5/66 , G11B5/70
CPC分类号： G11B5/66 , G11B5/656 , G11B5/667 , G11B5/732 , G11B5/7325
摘要： A magnetic recording medium based on the perpendicular magnetic recording system includes a substrate; a back layer which is formed on the substrate and which is formed of a soft magnetic material; an in-plane magnetized layer which is formed on the back layer and which has in-plane magnetization; and a recording layer which is formed on the in-plane magnetized layer and which has perpendicular magnetization, wherein the in-plane magnetized layer has a coercivity in an in-plane direction larger than a magnetic field generated by residual magnetization in a perpendicular direction of the recording layer. The influence on the reproduction output, caused by the mirror image effect of the soft magnetic back layer is reduced in wide range recording densities, thereby improving the resolution by decreasing the difference between the reproduction outputs of the magnetic recording medium at the low recording density and at the high recording density.
摘要翻译：基于垂直磁记录系统的磁记录介质包括基板; 背衬层，其形成在所述基板上并且由软磁性材料形成; 面内磁化层，其形成在背层上并具有面内磁化; 以及形成在所述面内磁化层上并且具有垂直磁化的记录层，其中所述面内磁化层的面内方向的矫顽力大于在垂直方向上的残余磁化产生的磁场的矫顽力录音层。在宽范围的记录密度下，由软磁背层的镜像效果引起的对再现输出的影响减小，从而通过将低记录密度的磁记录介质的再现输出与在高记录密度。

2. 发明申请

US20050048321A1 Magnetic recording medium and magnetic recording apparatus 失效
标题翻译：磁记录介质和磁记录装置
公开(公告)号：US20050048321A1
公开(公告)日：2005-03-03
申请号：US10930755
申请日：2004-09-01
申请人： Enji Fujita , Hideaki Yamanaka , Tsuyoshi Onuma , Satoshi Matsunuma , Akira Yano , Tetsunori Koda , Katsusuke Shimazaki
发明人： Enji Fujita , Hideaki Yamanaka , Tsuyoshi Onuma , Satoshi Matsunuma , Akira Yano , Tetsunori Koda , Katsusuke Shimazaki
IPC分类号： G11B5/64 , G11B5/66 , G11B5/667
CPC分类号： G11B5/66 , G11B5/656 , G11B5/667 , G11B5/732 , G11B5/7325
摘要： A magnetic recording medium based on the perpendicular magnetic recording system includes a substrate; a back layer which is formed on the substrate and which is formed of a soft magnetic material; an in-plane magnetized layer which is formed on the back layer and which has in-plane magnetization; and a recording layer which is formed on the in-plane magnetized layer and which has perpendicular magnetization, wherein the in-plane magnetized layer has a coercivity in an in-plane direction larger than a magnetic field generated by residual magnetization in a perpendicular direction of the recording layer. The influence on the reproduction output, caused by the mirror image effect of the soft magnetic back layer is reduced in wide range recording densities, thereby improving the resolution by decreasing the difference between the reproduction outputs of the magnetic recording medium at the low recording density and at the high recording density.
摘要翻译：基于垂直磁记录系统的磁记录介质包括基板; 背衬层，其形成在所述基板上并且由软磁性材料形成; 面内磁化层，其形成在背层上并具有面内磁化; 以及形成在所述面内磁化层上并且具有垂直磁化的记录层，其中所述面内磁化层的面内方向的矫顽力大于在垂直方向上的残余磁化产生的磁场的矫顽力录音层。在宽范围的记录密度下，由软磁背层的镜像效果引起的对再现输出的影响减小，从而通过将低记录密度的磁记录介质的再现输出与在高记录密度。

3. 发明授权

US06994923B2 Magnetic recording medium, method for producing the same, and magnetic recording apparatus 失效
公开(公告)号：US06994923B2
公开(公告)日：2006-02-07
申请号：US10460197
申请日：2003-06-13
申请人： Tetsunori Koda , Akira Yano , Enji Fujita , Tsuyoshi Onuma , Satoshi Matsunuma
发明人： Tetsunori Koda , Akira Yano , Enji Fujita , Tsuyoshi Onuma , Satoshi Matsunuma
IPC分类号： G11B5/66 , G11B5/70
CPC分类号： G11B5/732 , G11B5/64 , G11B5/66 , G11B5/667 , G11B5/851
摘要： A magnetic recording medium in which the medium noise is reduced and information can be recorded at a high S/N level, and a method for producing the magnetic recording medium are provided. A magnetic recording apparatus, which is excellent in thermal stability and which makes it possible to perform the high density recording, is provided. When films are formed for the magnetic recording medium based on the perpendicular magnetic recording method, the content of B in a seed layer is made sufficiently larger than the content of B in a recording layer. Accordingly, B is diffused from the seed layer to the recording layer to facilitate the segregation of B at the crystal grain boundary in the recording layer. Thereby, the magnetic interaction between the crystal grains in the recording layer is further reduced. Thus, it is possible to greatly reduce the transition noise.

4. 发明授权

US06846582B2 Magnetic recording medium, method for producing the same, and magnetic storage apparatus 失效
标题翻译：磁记录介质，其制造方法和磁存储装置
公开(公告)号：US06846582B2
公开(公告)日：2005-01-25
申请号：US10292469
申请日：2002-11-13
申请人： Tsuyoshi Onuma , Akira Yano , Satoshi Matsunuma , Takanobu Takayama
发明人： Tsuyoshi Onuma , Akira Yano , Satoshi Matsunuma , Takanobu Takayama
IPC分类号： G11B5/64 , G11B5/65 , G11B5/667 , G11B5/673 , G11B5/73 , G11B5/66 , B32B15/01 , C25D5/26 , G11B5/70
CPC分类号： G11B5/732 , G11B5/656 , G11B5/667 , G11B5/7325 , Y10S428/90 , Y10T428/12861 , Y10T428/12875 , Y10T428/24942 , Y10T428/265
摘要： A magnetic recording medium 100 comprises, on a substrate 1, a soft magnetic layer 3, a seed layer 5, and a recording layer 6 having an artificial lattice structure. The seed layer 5 is formed of Pd and one selected from the group consisting of Si, B, C, and Zr. Accordingly, the magnetic exchange coupling force of the recording layer 6 in the in-plane direction can be weakened. Minute recording magnetic domains can be formed in the recording layer 6, and the magnetization transition area is distinct as well. Thus, the medium noise is reduced. That is, reproduction can be performed with a low medium noise even when information is recorded at a high density. A magnetic storage apparatus, which is provided with the magnetic recording medium as described above, can achieve an areal recording density of 150 Gigabits/square inch.
摘要翻译：磁记录介质100在基板1上包括软磁层3，种子层5和具有人造晶格结构的记录层6。种子层5由Pd和选自由Si，B，C和Zr组成的组中的一种形成。因此，可以削弱记录层6在面内方向上的磁交换耦合力。可以在记录层6中形成分钟记录磁畴，并且磁化过渡区也是不同的。因此，中等噪声降低。也就是说，即使以高密度记录信息，也可以以低的中等噪声进行再现。如上所述设置有磁记录介质的磁存储装置可以实现150吉比特/平方英寸的面密度记录密度。

5. 发明授权

US06815098B2 Magnetic recording medium, method for producing the same, and magnetic storage apparatus 失效
标题翻译：磁记录介质，其制造方法和磁存储装置
公开(公告)号：US06815098B2
公开(公告)日：2004-11-09
申请号：US10411299
申请日：2003-04-11
申请人： Satoshi Matsunuma , Akira Yano , Tsuyoshi Onuma , Takanobu Takayama , Harumi Hieida , Kouichirou Wakabayashi
发明人： Satoshi Matsunuma , Akira Yano , Tsuyoshi Onuma , Takanobu Takayama , Harumi Hieida , Kouichirou Wakabayashi
IPC分类号： G11B566
CPC分类号： G11B5/00 , G11B5/012 , G11B5/66 , G11B5/74 , G11B5/851 , Y10S428/90 , Y10T428/12465 , Y10T428/12868 , Y10T428/265
摘要： A magnetic recording medium comprises, on a substrate, a soft magnetic layer, a first seed layer, a second seed layer, and a recording layer having an artificial lattice structure. The first seed layer contains oxide of Fe. The second seed layer contains one of Pd and Pt, Si, and N. The magnetic exchange coupling force in the in-plane direction of the recording layer is weakened by the first seed layer and the second seed layer. Accordingly, minute recording magnetic domains can be formed in the recording layer, and the magnetization transition area is distinct as well. Even when information is recorded at a high density, the information can be reproduced with low noise. A magnetic storage apparatus, which is provided with such a magnetic recording medium, makes it possible to achieve an areal recording density of 150 gigabits/square inch.
摘要翻译：磁记录介质在基板上包括软磁层，第一晶种层，第二晶种层和具有人造晶格结构的记录层。第一种子层含有Fe的氧化物。第二种子层包含Pd和Pt，Si和N中的一个。记录层的面内方向上的磁交换耦合力被第一种子层和第二种子层削弱。因此，可以在记录层中形成分钟记录磁畴，并且磁化过渡区也是不同的。即使当以高密度记录信息时，可以以低噪声再现信息。具有这种磁记录介质的磁存储装置使得可以实现150吉比特/平方英寸的面积记录密度。

6. 发明授权

US06602621B2 Magnetic recording medium, method for producing the same, and magnetic storage apparatus 失效
公开(公告)号：US06602621B2
公开(公告)日：2003-08-05
申请号：US10026636
申请日：2001-12-27
申请人： Satoshi Matsunuma , Akira Yano , Tsuyoshi Onuma , Takanobu Takayama , Harumi Hieida , Kouichirou Wakabayashi
发明人： Satoshi Matsunuma , Akira Yano , Tsuyoshi Onuma , Takanobu Takayama , Harumi Hieida , Kouichirou Wakabayashi
IPC分类号： G11B566
CPC分类号： G11B5/00 , G11B5/012 , G11B5/66 , G11B5/74 , G11B5/851 , Y10S428/90 , Y10T428/12465 , Y10T428/12868 , Y10T428/265
摘要： A magnetic recording medium comprises, on a substrate, a soft magnetic layer, a first seed layer, a second seed layer, and a recording layer having an artificial lattice structure. The first seed layer contains oxide of Fe. The second seed layer contains one of Pd and Pt, Si, and N. The magnetic exchange coupling force in the in-plane direction of the recording layer is weakened by the first seed layer and the second seed layer. Accordingly, minute recording magnetic domains can be formed in the recording layer, and the magnetization transition area is distinct as well. Even when information is recorded at a high density, the information can be reproduced with low noise. A magnetic storage apparatus, which is provided with such a magnetic recording medium, makes it possible to achieve an areal recording density of 150 gigabits/square inch.

7. 发明申请

US20080260985A1 Information-recording medium 审中-公开
标题翻译：信息记录介质
公开(公告)号：US20080260985A1
公开(公告)日：2008-10-23
申请号：US12068531
申请日：2008-02-07
申请人： Hiroshi Shirai , Kazuyoshi Adachi , Osamu Ishizaki , Tsuyoshi Onuma
发明人： Hiroshi Shirai , Kazuyoshi Adachi , Osamu Ishizaki , Tsuyoshi Onuma
IPC分类号： G11B7/24
CPC分类号： G11B7/24038 , G11B2007/24312 , G11B2007/24314 , G11B2007/24316
摘要： An information-recording medium includes first and second recording layers each of which is formed of a phase-change material containing Bi, Ge, and Te, wherein the first recording layer is arranged nearer to a light-incident side of the laser beam than the second recording layer; a composition of Bi, Ge, and Te contained in the second recording layer is within a composition range surrounded by composition points B2, C2, D2, D6, C6, and B6 on a triangular composition diagram of Bi, Ge, and Te; and a difference (α−δ) between a composition α of Bi in the first recording layer and a composition δ of Bi in the second recording layer is −1.0 to 3.0 at. %. Thus, there is provided a two-layered information-recording medium with high recording-data reliability and excellent repeated-data recording durability.
摘要翻译：信息记录介质包括第一和第二记录层，每个记录层由包含Bi，Ge和Te的相变材料形成，其中第一记录层被布置成比激光束的光入射侧更靠近激光束的光入射侧第二记录层; 包含在第二记录层中的Bi，Ge和Te的组成在组成点B 2，C 2，D 2，D 6，C 6和B 6的组成范围内，Bi的三角形组成图上， Ge，Te; 并且第一记录层中Bi的组成α和第二记录层中Bi的组成δ之差（α-δ）为-1.0至3.0at。％。因此，提供了具有高记录数据可靠性和优异的重复数据记录耐久性的双层信息记录介质。

8. 发明授权

US06970400B1 Information recording medium with magnetic marks, recording and reproducing apparatus therefor, and head positioning method using detected magnetic leakage fields from the magnetic marks 失效
标题翻译：具有磁痕的信息记录介质，其记录和再现装置以及使用来自磁痕的检测到的磁泄漏场的磁头定位方法
公开(公告)号：US06970400B1
公开(公告)日：2005-11-29
申请号：US09671478
申请日：2000-09-27
申请人： Kouichirou Wakabayashi , Tsuyoshi Onuma , Teruaki Takeuchi , Nobuyuki Inaba , Fumiyoshi Kirino
发明人： Kouichirou Wakabayashi , Tsuyoshi Onuma , Teruaki Takeuchi , Nobuyuki Inaba , Fumiyoshi Kirino
IPC分类号： G11B5/00 , G11B5/012 , G11B5/48 , G11B5/55 , G11B5/596 , G11B5/74 , G11B5/82 , G11B11/00 , G11B13/04
CPC分类号： G11B13/045 , G11B5/012 , G11B5/488 , G11B5/5526 , G11B5/59677 , G11B5/74 , G11B5/82 , G11B2005/0002 , G11B2005/0005 , G11B2005/0021
摘要： A recording and reproducing apparatus including a recording magnetic head and a reproducing magnetic head with their floating height lowered for high density recordation and reproduction is provided. An information recording medium is provided on which it is possible to densely record information and from which it is possible to densely reproduce information by lowering the floating height of the recording and reproducing heads. The information recording medium includes a flat substrate and a recording layer provided on the substrate. Servo patterns and management information are recorded as magnetic marks on the recording layer in advance by a servo writer or the like. Because the substrate needs no recessed and embossed patterns formed in it, the slider of the recording and reproducing apparatus can be floated at a constant floating height lower than conventionally over the whole area of the medium. During information recordation, the position of the slider is controlled on the basis of the magneto-optical signals from the magnetic marks. During information reproduction, the reproducing magnetic head controls the slider position on the basis of the magnetic leakage fields leaking from the magnetic marks.
摘要翻译：提供包括记录磁头和其浮动高度降低以用于高密度记录和再现的再现磁头的记录和再现装置。提供一种信息记录介质，在该信息记录介质上可以密集地记录信息，并且可以通过降低记录和再现磁头的浮动高度从而可以密集地再现信息。信息记录介质包括平坦基板和设置在基板上的记录层。伺服模式和管理信息通过伺服写入器等预先记录在记录层上作为磁标记。因为基板不需要在其中形成凹陷和压花图案，所以记录和再现装置的滑动件可以浮动在比传统的介质整个区域以下的恒定浮动高度。在信息记录期间，滑块的位置是根据来自磁痕的磁光信号进行控制的。在信息再现期间，再现磁头基于从磁痕泄漏的磁泄漏场来控制滑块位置。

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