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31. 发明授权

US07875373B2 Perpendicular magnetic recording medium and magnetic storage apparatus using the same 有权
标题翻译：垂直磁记录介质及使用其的磁存储装置
公开(公告)号：US07875373B2
公开(公告)日：2011-01-25
申请号：US11985310
申请日：2007-11-13
申请人： Yoshiyuki Hirayama , Ichiro Tamai , Reiko Arai
发明人： Yoshiyuki Hirayama , Ichiro Tamai , Reiko Arai
IPC分类号： G11B5/65
CPC分类号： G11B5/65 , G11B5/7325 , G11B5/851 , Y10T428/11
摘要： Embodiments in accordance with the present invention help to obtain a perpendicular magnetic recording medium having a granular structure, excellent recording/reproducing properties, and excellent durability. According to one embodiment, a recording layer includes a layer which has crystal grains mainly composed of cobalt and crystal grain boundaries mainly composed of the oxide; the oxygen content of the recoding layer is changed in the film thickness direction; the oxygen content in the area in the vicinity of the interface between the recording layer and the intermediate layer is made lower than the oxygen content in the area in the vicinity of the center of the recording layer; and the oxygen content in the area in the vicinity of the interface between the recording layer and the protective layer is made lower than the oxygen content in the area in the vicinity of the center of the recording layer.
摘要翻译：根据本发明的实施例有助于获得具有颗粒结构的良好的记录/再现性能和优异的耐久性的垂直磁记录介质。根据一个实施例，记录层包括主要由钴构成的晶粒和主要由氧化物构成的晶界的层; 记录层的氧含量在膜厚方向上变化; 记录层和中间层之间的界面附近的区域中的氧含量低于记录层中心附近的区域中的氧含量; 并且将记录层和保护层之间的界面附近的区域中的氧含量设定得低于记录层中心附近的区域中的氧含量。

32. 发明申请

US20110002064A1 PERPENDICULAR MAGNETIC RECORDING MEDIUM (PMRM) AND MAGNETIC STORAGE DEVICE USING THE SAME 有权
标题翻译：全磁磁记录介质（PMRM）和使用其的磁性存储装置
公开(公告)号：US20110002064A1
公开(公告)日：2011-01-06
申请号：US12828073
申请日：2010-06-30
申请人： Hiroyuki Nakagawa , Reiko Arai , Ichiro Tamai , Kiwamu Tanahashi
发明人： Hiroyuki Nakagawa , Reiko Arai , Ichiro Tamai , Kiwamu Tanahashi
IPC分类号： G11B21/02 , G11B5/33
CPC分类号： G11B5/66 , G11B5/1278 , G11B5/65
摘要： According to one embodiment, a PMRM includes a substrate, a soft magnetic underlayer above the substrate, an underlayer above the soft magnetic underlayer, an oxide-containing magnetic layer above the underlayer, and a ferromagnetic layer above the magnetic layer having no oxides. The underlayer controls orientation and segregation of the magnetic layer. The oxide-containing magnetic layer comprises at least two or more magnetic layers, a Cr concentration of the magnetic layer adjacent to the ferromagnetic metal layer is between about 23 at. % and about 32 at. %, and a difference between the Cr concentration of the magnetic layer adjacent to the ferromagnetic metal layer and a magnetic layer having a lowest Cr concentration among the at least three magnetic layers is less than about 25 at. %, the magnetic layer with a lowest Cr concentration has a granular structure, and a nucleation field is greater than about 159.2 kA/m.
摘要翻译：根据一个实施例，PMRM包括衬底，衬底上方的软磁性底层，软磁性底层上方的底层，底层上方的含氧化物的磁性层以及不含氧化物的磁性层上方的铁磁性层。底层控制磁性层的取向和偏析。含氧化物的磁性层包括至少两个或更多个磁性层，与强磁性金属层相邻的磁性层的Cr浓度在约23at。％和约32英寸。％，并且与所述强磁性金属层相邻的磁性层的Cr浓度与所述至少三个磁性层中具有最低Cr浓度的磁性层之间的差异小于约25at。％，具有最低Cr浓度的磁性层具有粒状结构，并且成核场大于约159.2kA / m。

33. 发明授权

US07701667B2 Perpendicular magnetic recording medium and magnetic storage apparatus using the same 有权
标题翻译：垂直磁记录介质及使用其的磁存储装置
公开(公告)号：US07701667B2
公开(公告)日：2010-04-20
申请号：US11651922
申请日：2007-01-09
申请人： Ichiro Tamai , Ikuko Takekuma , Hiroaki Nemoto , Yoshiyuki Hirayama
发明人： Ichiro Tamai , Ikuko Takekuma , Hiroaki Nemoto , Yoshiyuki Hirayama
IPC分类号： G11B5/66
CPC分类号： G11B5/66 , G11B5/656 , G11B5/667
摘要： Embodiments in accordance with the present invention provide a perpendicular recording medium with low noise and high recording density by reducing the effects from noise generated from the vicinity of the interface with the intermediate layer of the recording layer, in a perpendicular recording medium utilizing a granular recording layer containing oxygen or oxide additive in a cobalt-chromium alloy formed on an intermediate layer with a ruthenium or ruthenium alloy layer. A first recording layer and a second recording layer are formed in order on an intermediate layer of ruthenium or ruthenium alloy. The first recording layer and the second recording layer are comprised of cobalt as the main material in a granular structure containing chromium and oxygen. The saturation magnetization of the first recording layer is lower than the saturation magnetization of the second recording layer. When a first recording layer saturation magnetization is set as Ms1(emu per cubic centimeter), a second recording layer saturation magnetization is set as Ms2(emu per cubic centimeter), and the first recording layer film thickness is set to t1 (nm), then (Ms2−Ms1)×t1 will be larger than 0 (memu per square centimeter) and smaller than 0.15 (memu per square centimeter).
摘要翻译：根据本发明的实施例通过减少在与记录层的中间层的界面附近产生的噪声的影响，在使用粒状记录的垂直记录介质中提供具有低噪声和高记录密度的垂直记录介质在含有钌或钌合金层的中间层上形成的钴 - 铬合金中含有氧或氧化物添加剂的层。在钌或钌合金的中间层上依次形成第一记录层和第二记录层。第一记录层和第二记录层由包含铬和氧的颗粒结构中的钴作为主要材料组成。第一记录层的饱和磁化强度低于第二记录层的饱和磁化强度。当第一记录层的饱和磁化强度设定为Ms1（emu /立方厘米）时，第二记录层的饱和磁化强度设定为Ms2（emu /立方厘米），第一记录层膜厚设定为t1（nm）那么（Ms2-Ms1）×t1将大于0（每平方厘米的记忆），小于0.15（每平方厘米的记忆）。

34. 发明申请

US20060076233A1 Magnetic recording medium and method for production thereof 审中-公开
标题翻译：磁记录介质及其制造方法
公开(公告)号：US20060076233A1
公开(公告)日：2006-04-13
申请号：US11246344
申请日：2005-10-06
申请人： Yoshinori Honda , Ikuko Takekuma , Ichiro Tamai
发明人： Yoshinori Honda , Ikuko Takekuma , Ichiro Tamai
IPC分类号： C23C14/00
CPC分类号： G11B5/851 , C23C14/0057 , C23C14/568 , G11B5/667
摘要： A reactive sputtering method is provided for producing a magnetic layer in a stable manner with good reproducibility. One aspect of the invention is to form a magnetic layer for a magnetic recording medium without adversely affecting magnetic properties. Carbon oxide gas is added at the time of reactive sputtering. In one embodiment, a method for producing a magnetic recording medium includes forming at least a soft magnetic layer and a magnetic layer above a substrate, wherein forming said magnetic layer includes sputtering with argon gas and carbon oxide gas.
摘要翻译：提供了以良好的再现性稳定地制造磁性层的反应性溅射方法。本发明的一个方面是形成用于磁记录介质的磁性层，而不会不利地影响磁特性。在反应溅射时加入碳氧化物气体。在一个实施例中，制造磁记录介质的方法包括至少在基板上形成软磁性层和磁性层，其中形成所述磁性层包括用氩气和碳氧化物气体溅射。

35. 发明授权

US09058831B2 Perpendicular magnetic recording medium with grain boundary controlling layers 有权
标题翻译：具有晶界控制层的垂直磁记录介质
公开(公告)号：US09058831B2
公开(公告)日：2015-06-16
申请号：US13326213
申请日：2011-12-14
申请人： Shun Tonooka , Kiwamu Tanahashi , Hiroyuki Nakagawa , Ichiro Tamai
发明人： Shun Tonooka , Kiwamu Tanahashi , Hiroyuki Nakagawa , Ichiro Tamai
IPC分类号： G11B5/66 , G11B5/65 , G11B5/851
CPC分类号： G11B5/66 , G11B5/65 , G11B5/84 , G11B5/851
摘要： In one embodiment, a perpendicular magnetic recording medium includes an oxide recording layer including an oxide and a non-oxide recording layer which does not contain an oxide positioned above the oxide recording layer. The oxide recording layer includes a region R1 where a grain boundary width in a direction parallel to a plane of formation of R1 increases therealong from a lowermost portion of the oxide recording layer toward a medium surface, a region R3 positioned above R1 wherein a grain boundary width increases therealong toward the medium surface, a region R2 where a grain boundary width of R2 decreases therealong from R1 to R3, with R2 being positioned between R1 and R3, and a region R4 where a grain boundary width of R4 decreases therealong from R3 toward the medium surface, with R4 being positioned above R3 and near an uppermost portion of the oxide recording layer.
摘要翻译：在一个实施例中，垂直磁记录介质包括氧化物记录层，该氧化物记录层包括不包含位于氧化物记录层上方的氧化物的氧化物和非氧化物记录层。氧化物记录层包括区域R1，其中平行于R1的形成平面的方向上的晶界宽度从氧化物记录层的最下部朝向介质表面增加，位于R1上方的区域R3，其中晶界宽度随着介质表面的增加而增加，其中R2的晶界宽度从R1向R3延伸的区域R2，R2位于R1和R3之间，R4的晶界宽度从R3向R3的边界宽度减小中间表面，其中R4位于R3上方并且靠近氧化物记录层的最上部。

36. 发明授权

US08703307B2 Perpendicular magnetic recording medium and magnetic storage apparatus using the same 有权
标题翻译：垂直磁记录介质及使用其的磁存储装置
公开(公告)号：US08703307B2
公开(公告)日：2014-04-22
申请号：US12903135
申请日：2010-10-12
申请人： Akemi Hirotsune , Yotsuo Yahisa , Ichiro Tamai
发明人： Akemi Hirotsune , Yotsuo Yahisa , Ichiro Tamai
IPC分类号： G11B5/66
CPC分类号： G11B5/82 , G11B5/732 , G11B5/7325
摘要： According to one embodiment, a perpendicular magnetic recording medium includes a soft magnetic underlayer formed above a substrate, a lower seed layer formed above the soft magnetic underlayer, at least one upper seed layer formed above the lower seed layer, an interlayer formed above the at least one upper seed layer, a perpendicular recording layer formed above the interlayer, and a protective layer formed above the perpendicular recording layer, wherein the at least one upper seed layer comprises Ni or a Ni based alloy including N, and wherein the lower seed layer includes Ni and at least one element selected from a group consisting of: W and Cr. Other embodiments are described herein regarding perpendicular magnetic recording systems and methods of producing perpendicular magnetic media.
摘要翻译：根据一个实施例，垂直磁记录介质包括形成在基底上方的软磁性底层，形成在软磁性底层上方的下部种子层，形成在下部种子层上方的至少一个上部种子层，至少一个上部种子层，形成在中间层上方的垂直记录层和形成在垂直记录层上方的保护层，其中至少一个上部种子层包含Ni或包含N的Ni基合金，并且其中下部种子层包括Ni和选自由W和Cr组成的组中的至少一种元素。本文描述了关于垂直磁记录系统和产生垂直磁性介质的方法的其它实施例。

37. 发明申请

US20130155542A1 PERPENDICULAR MAGNETIC RECORDING MEDIUM WITH GRAIN BOUNDARY CONTROLLING LAYERS 有权
标题翻译：具有颗粒边界控制层的全磁性记录介质
公开(公告)号：US20130155542A1
公开(公告)日：2013-06-20
申请号：US13326213
申请日：2011-12-14
申请人： Shun Tonooka , Kiwamu Tanahashi , Hiroyuki Nakagawa , Ichiro Tamai
发明人： Shun Tonooka , Kiwamu Tanahashi , Hiroyuki Nakagawa , Ichiro Tamai
IPC分类号： G11B21/02 , G11B5/851 , G11B5/66
CPC分类号： G11B5/66 , G11B5/65 , G11B5/84 , G11B5/851
摘要： In one embodiment, a perpendicular magnetic recording medium includes an oxide recording layer including an oxide and a non-oxide recording layer which does not contain an oxide positioned above the oxide recording layer. The oxide recording layer includes a region R1 where a grain boundary width in a direction parallel to a plane of formation of R1 increases therealong from a lowermost portion of the oxide recording layer toward a medium surface, a region R3 positioned above R1 wherein a grain boundary width increases therealong toward the medium surface, a region R2 where a grain boundary width of R2 decreases therealong from R1 to R3, with R2 being positioned between R1 and R3, and a region R4 where a grain boundary width of R4 decreases therealong from R3 toward the medium surface, with R4 being positioned above R3 and near an uppermost portion of the oxide recording layer.
摘要翻译：在一个实施例中，垂直磁记录介质包括氧化物记录层，该氧化物记录层包括不包含位于氧化物记录层上方的氧化物的氧化物和非氧化物记录层。氧化物记录层包括区域R1，其中平行于R1的形成平面的方向上的晶界宽度从氧化物记录层的最下部朝向介质表面增加，位于R1上方的区域R3，其中晶界宽度随着介质表面的增加而增加，其中R2的晶界宽度从R1向R3延伸的区域R2，R2位于R1和R3之间，R4的晶界宽度从R3向R3的边界宽度减小中间表面，其中R4位于R3上方并且靠近氧化物记录层的最上部。

38. 发明申请

US20120099220A1 PERPENDICULAR MAGNETIC RECORDING MEDIUM (PMRM) AND SYSTEMS THEREOF 审中-公开
标题翻译：全能磁记录介质（PMRM）及其系统
公开(公告)号：US20120099220A1
公开(公告)日：2012-04-26
申请号：US12909783
申请日：2010-10-21
申请人： Ichiro Tamai , Yotsuo Yahisa , Akemi Hirotsune
发明人： Ichiro Tamai , Yotsuo Yahisa , Akemi Hirotsune
IPC分类号： G11B21/02 , B05D5/12 , G11B5/706
CPC分类号： G11B5/7325 , G11B5/7379
摘要： In one embodiment, a perpendicular magnetic recording medium includes a crystalline seed layer having a pseudo-hcp structure with stacking faults formed above a soft magnetic underlayer, a first interlayer comprising Ru and one of W, Ta, Mo, and Nb formed above the crystalline seed layer, a second interlayer formed above the first interlayer, and a magnetic recording layer formed above the second interlayer. The first interlayer has a W concentration between about 32 at % and 50 at %, Mo in a concentration between about 36 at % and 52 at %, Ta in a concentration between about 20 at % and 30 at %, or Nb in a concentration between about 7 at % and 30 at %. In another embodiment, a system includes a recording medium as described above, a magnetic head for reading from and/or writing to the medium, a head slider for supporting the head, and a control unit coupled to the head.
摘要翻译：在一个实施例中，垂直磁记录介质包括具有形成在软磁性底层上方的堆垛层错的伪hcp结构的结晶种子层，包含Ru和在晶体上形成的W，Ta，Mo和Nb中的一个的第一中间层晶种层，形成在第一中间层上方的第二中间层和形成在第二中间层上方的磁记录层。第一中间层具有约32at％至50at％的W浓度，浓度在约36at％至52at％之间的Mo，浓度在约20at％至30at％之间的Ta或浓度为Nb 在约7at％和30at％之间。在另一个实施例中，系统包括如上所述的记录介质，用于从介质读取和/或写入介质的磁头，用于支撑磁头的磁头滑块以及耦合到磁头的控制单元。

39. 发明授权

US07625644B2 Perpendicular magnetic recording medium and manufacturing of the same 失效
标题翻译：垂直磁记录介质和制造相同
公开(公告)号：US07625644B2
公开(公告)日：2009-12-01
申请号：US11257978
申请日：2005-10-24
申请人： Takayuki Ichihara , Hiroyuki Nakagawa , Ikuko Takekuma , Ichiro Tamai
发明人： Takayuki Ichihara , Hiroyuki Nakagawa , Ikuko Takekuma , Ichiro Tamai
IPC分类号： G11B5/66
CPC分类号： C23C14/34 , G11B5/656 , G11B5/667 , G11B5/851
摘要： In a granular magnetic recording layer of a perpendicular magnetic recording medium, media noises are reduced by separating adequately magnetic crystal grains and non-magnetic grain boundary and decreasing magnetic exchange interactions among the magnetic crystal grains without causing damage to magnetic anisotropy of the magnetic crystal grains. In one embodiment, the perpendicular magnetic recording medium, in which crystal alloy grains containing Co, Pt, and Cr, and non-magnetic grain boundary containing Si and O is included; the ratio of the number of O atom to that of Si atom in the magnetic recording layer is between about 2.5 and 5; the Si atomic composition in the magnetic recording layer is between about 3 and 6 atomic %; and the O atomic composition in the magnetic recording layer is between about 12 and 20 atomic %, is used. The in-plane distribution of perpendicular coercivity at any points of the medium of the magnetic recording layer is made at most about ±10% of an average value.
摘要翻译：在垂直磁记录介质的粒状磁记录层中，通过分离磁性晶粒和非磁性晶界以及降低磁晶粒之间的磁交换相互作用而不损害磁性晶粒的磁各向异性来降低介质噪声。在一个实施例中，包括含有Co，Pt和Cr的晶体合金晶粒和含有Si和O的非磁性晶界的垂直磁记录介质; 磁记录层中的O原子数与Si原子数的比例在约2.5和5之间; 磁记录层中的Si原子组成在约3和6原子％之间; 并且使用磁记录层中的O原子组成为约12至20原子％。在磁记录层的介质的任何点处的垂直矫顽力的平面内分布最多为平均值的约±10％。

40. 发明申请

US20090195924A1 Perpendicular magnetic recording medium and magnetic recording/reproducing apparatus using the same 有权
标题翻译：垂直磁记录介质和使用其的磁记录/再现装置
公开(公告)号：US20090195924A1
公开(公告)日：2009-08-06
申请号：US12288654
申请日：2008-10-21
申请人： Hiroaki Nemoto , Ikuko Takekuma , Ichiro Tamai , Yoshiyuki Hirayama
发明人： Hiroaki Nemoto , Ikuko Takekuma , Ichiro Tamai , Yoshiyuki Hirayama
IPC分类号： G11B5/127 , G11B5/667
CPC分类号： G11B5/732 , G11B5/65 , G11B5/66 , G11B5/667 , G11B5/7325
摘要： Embodiments of the present invention help allow accurate control of the magnetization reversal in a magnetic recording layer in small reversal units, whereby high-density recording can be achieved. According to one embodiment, by forming an intermediate layer having a granular structure similar to that of the magnetic recording layer below the magnetic recording layer, a continuous crystal grain boundary is formed at the interface between the magnetic recording layer and the intermediate layer, thereby preventing incomplete formation of the crystal grain boundary found in the initial growth layer of the magnetic recording layer. The intermediate layer comprises a non-magnetic alloy comprising Co and Cr as its main components and an oxide such as Al, Cr, Hf. Mg, Nb, Si, Ta, Ti and Zr. Further, the average content of the oxygen element in the intermediate layer is in the range from 6 at % to 20 at %.
摘要翻译：本发明的实施例有助于在小的反转单元中精确地控制磁记录层中的磁化反转，由此可以实现高密度记录。根据一个实施例，通过在磁记录层下方形成具有类似于磁记录层的颗粒结构的中间层，在磁记录层和中间层之间的界面处形成连续的晶界，从而防止在磁记录层的初始生长层中发现的晶界的不完全的形成。中间层包括以Co和Cr为主要成分的非磁性合金和Al，Cr，Hf等氧化物。 Mg，Nb，Si，Ta，Ti和Zr。此外，中间层中的氧元素的平均含量在6at％至20at％的范围内。

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