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11. 发明申请

US20070223142A1 Magnetic storage apparatus 有权
标题翻译：磁存储装置
公开(公告)号：US20070223142A1
公开(公告)日：2007-09-27
申请号：US11726099
申请日：2007-03-20
申请人： Ikuko Takekuma , Hiroyuki Nakagawa , Hiroaki Nemoto , Yoshiyuki Hirayama
发明人： Ikuko Takekuma , Hiroyuki Nakagawa , Hiroaki Nemoto , Yoshiyuki Hirayama
IPC分类号： G11B5/74 , G11B5/66
CPC分类号： G11B5/66 , G11B5/11 , G11B5/1278 , G11B5/3116 , G11B5/3146 , G11B5/315 , G11B5/3967 , G11B5/656
摘要： According to embodiments of the present invention, a shielded pole writer and a perpendicular magnetic recording medium suitable thereto are combined to provide high medium SNR and excellent OW characteristic simultaneously. A perpendicular magnetic recording medium of a magnetic storage apparatus mounting a shielded pole writer, including a perpendicular magnetic recording medium having a recording layer of a three layered structure is used. A first recording layer has a granular structure consisting of grain boundaries containing an oxide and columnar grains comprising a CoCrPt alloy, in which a second recording layer and a third recording layer formed thereabove comprise Co as a main ingredient, contain Cr and do not contain an oxide, and the Cr concentration in the second recording layer is lower than the Cr concentration in the third recording layer.
摘要翻译：根据本发明的实施例，组合屏蔽极写入器和适合于其的垂直磁记录介质，以同时提供高中等信噪比和优异的OW特性。使用安装屏蔽极写入器的磁存储装置的垂直磁记录介质，其包括具有三层结构的记录层的垂直磁记录介质。第一记录层具有由包含氧化物的晶界和包含CoCrPt合金的柱状晶粒构成的粒状结构，其中形成在其上的第二记录层和第三记录层包含Co作为主要成分，并且不含有并且第二记录层中的Cr浓度低于第三记录层中的Cr浓度。

12. 发明授权

US08709618B2 Magnetic storage apparatus 有权
标题翻译：磁存储装置
公开(公告)号：US08709618B2
公开(公告)日：2014-04-29
申请号：US11726099
申请日：2007-03-20
申请人： Ikuko Takekuma , Hiroyuki Nakagawa , Hiroaki Nemoto , Yoshiyuki Hirayama
发明人： Ikuko Takekuma , Hiroyuki Nakagawa , Hiroaki Nemoto , Yoshiyuki Hirayama
IPC分类号： G11B5/66
CPC分类号： G11B5/66 , G11B5/11 , G11B5/1278 , G11B5/3116 , G11B5/3146 , G11B5/315 , G11B5/3967 , G11B5/656
摘要： According to embodiments of the present invention, a shielded pole writer and a perpendicular magnetic recording medium suitable thereto are combined to provide high medium SNR and excellent OW characteristic simultaneously. A perpendicular magnetic recording medium of a magnetic storage apparatus mounting a shielded pole writer, including a perpendicular magnetic recording medium having a recording layer of a three layered structure is used. A first recording layer has a granular structure consisting of grain boundaries containing an oxide and columnar grains comprising a CoCrPt alloy, in which a second recording layer and a third recording layer formed thereabove comprise Co as a main ingredient, contain Cr and do not contain an oxide, and the Cr concentration in the second recording layer is lower than the Cr concentration in the third recording layer.
摘要翻译：根据本发明的实施例，组合屏蔽极写入器和适合于其的垂直磁记录介质，以同时提供高中等信噪比和优异的OW特性。使用安装屏蔽极写入器的磁存储装置的垂直磁记录介质，其包括具有三层结构的记录层的垂直磁记录介质。第一记录层具有由包含氧化物的晶界和包含CoCrPt合金的柱状晶粒构成的粒状结构，其中形成在其上的第二记录层和第三记录层包含Co作为主要成分，并且不含有并且第二记录层中的Cr浓度低于第三记录层中的Cr浓度。

13. 发明授权

US08679654B2 Magnetic recording medium including plural FePt alloy layers including carbon, oxides or nitrides 有权
标题翻译：磁记录介质包括包含碳，氧化物或氮化物的多个FePt合金层
公开(公告)号：US08679654B2
公开(公告)日：2014-03-25
申请号：US13372116
申请日：2012-02-13
申请人： Hiroaki Nemoto , Ikuko Takekuma , Kimio Nakamura , Junichi Sayama
发明人： Hiroaki Nemoto , Ikuko Takekuma , Kimio Nakamura , Junichi Sayama
IPC分类号： G11B5/66 , G11B5/65 , C22C38/00 , C22C5/04
CPC分类号： G11B5/653 , C22C5/04 , C22C38/002 , C22C2202/02 , G11B5/65 , G11B5/66
摘要： Surface flatness of magnetic recording medium to which a magnetic recording layer made of L10 FePt magnetic alloy thin film, with distance between a magnetic head and a magnetic recording medium sufficiently reduced. The magnetic recording layer includes: magnetic layers containing a magnetic alloy including Fe and Pt as principal materials; and one non-magnetic material selected from carbon, oxide and nitride. The first magnetic layer disposed closer to a substrate has a granular structure in which magnetic alloy grains including FePt alloy as the principal material are separated from grain boundaries including the non-magnetic material as the principal material. The second magnetic layer disposed closer to the surface than the first magnetic layer is fabricated so as to have a homogeneous structure in which an FePt alloy and the non-magnetic material are mixed in a state finer than diameters of the FePt magnetic alloy grains in the first magnetic layer.
摘要翻译：由L10FePt磁性合金薄膜制成的磁记录层，磁头和磁记录介质之间的距离充分降低的磁记录介质的表面平整度。磁记录层包括：含有以Fe和Pt为主要材料的磁性合金的磁性层; 和一种选自碳，氧化物和氮化物的非磁性材料。靠近基板设置的第一磁性层具有以包含FePt合金作为主要材料的磁性合金颗粒与包括非磁性材料在内的晶界作为主要材料的颗粒结构。制造比第一磁性层更靠近表面的第二磁性层，以具有均匀的结构，其中FePt合金和非磁性材料以比FePt磁性合金粒子的直径小的状态混合第一磁性层。

14. 发明申请

US20120214021A1 MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING APPARATUS 审中-公开
标题翻译：磁记录介质和磁记录装置
公开(公告)号：US20120214021A1
公开(公告)日：2012-08-23
申请号：US13364682
申请日：2012-02-02
申请人： Junichi Sayama , Ikuko Takekuma , Hiroaki Nemoto
发明人： Junichi Sayama , Ikuko Takekuma , Hiroaki Nemoto
IPC分类号： G11B5/65
CPC分类号： G11B5/65 , G11B5/7325
摘要： There is provided a magnetic recording medium including an MgO underlayer that can be formed by a mass production process and has a thickness of 3 nm or less as well as including a magnetic recording layer made of an L10-type FePt ordered alloy having excellent magnetic properties. A conductive compound having a crystal structure belonging to a cubic system is used as a material of an underlayer provided at the bottom of the MgO underlayer. The thickness of the MgO layer is 1 nm or more and 3 nm or less.
摘要翻译：提供了一种包括MgO底层的磁记录介质，其可以通过批量生产工艺形成并具有3nm或更小的厚度，并且包括由具有优异磁性的L10型FePt有序合金制成的磁记录层。使用具有属于立方体系的晶体结构的导电化合物作为设置在MgO底层底部的底层的材料。 MgO层的厚度为1nm以上3nm以下。

15. 发明授权

US07457064B2 Perpendicular magnetic recording medium, method of evaluating magnetic properties of the same 失效
标题翻译：垂直磁记录介质，磁性能评价方法
公开(公告)号：US07457064B2
公开(公告)日：2008-11-25
申请号：US11715132
申请日：2007-03-06
申请人： Hiroaki Nemoto , Ikuko Takekuma , Yuzuru Hosoe
发明人： Hiroaki Nemoto , Ikuko Takekuma , Yuzuru Hosoe
IPC分类号： G11B5/667
CPC分类号： G11B5/82 , G11B5/1278 , G11B5/65
摘要： Embodiments in accordance with the present invention provide a perpendicular magnetic recording medium which is easy to record, offers superior thermal stability of recording magnetization, and allows high-density recording. In one embodiment, a perpendicular magnetic layer with controlled magnetic properties is used as a magnetic storage layer of a perpendicular magnetic recording medium, the magnetic properties having been controlled such that an indicator σhsw [%] of the dispersion of magnetization switching fields in the perpendicular magnetic layer and an indicator Dn [nm] of the intensity of exchange interactions, in film surface directions, in the perpendicular magnetic layer satisfy inequalities σhsw/27+Dn/90 20. The indicators can be measured using a magnetometer.
摘要翻译：根据本发明的实施例提供了易于记录的垂直磁记录介质，提供了优异的记录磁化的热稳定性，并允许高密度记录。在一个实施例中，使用具有受控磁特性的垂直磁性层作为垂直磁记录介质的磁存储层，其磁特性已经被控制，使得该磁性能的指标σ< 垂直磁性层中的磁化开关场的分散和膜的表面方向上的交换相互作用强度的指示器D N n [nm]满足不等式sigmah < / SUB + / 27 + D / 90 <1和D 20。指标可以用磁力计测量。

16. 发明申请

US20090116137A1 Perpendicular magnetic recording medium and magnetic storage apparatus using the same 审中-公开
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：US20090116137A1
公开(公告)日：2009-05-07
申请号：US12288598
申请日：2008-10-21
申请人： Ikuko Takekuma , Hiroaki Nemoto , Hiroyuki Nakagawa
发明人： Ikuko Takekuma , Hiroaki Nemoto , Hiroyuki Nakagawa
IPC分类号： G11B21/02 , G11B5/66
CPC分类号： G11B5/66 , G11B5/65 , G11B5/7379
摘要： Embodiments of the present invention provide a perpendicular magnetic recoding medium capable of decreasing exchange coupling between crystal grains while suppressing increase in the crystal grain size of the magnetic recording layer. According to one embodiment, a perpendicular magnetic recoding medium is formed by stacking a seed layer, an intermediate layer, a magnetic recording layer, and a protecting layer all above a substrate. The magnetic recording layer has a granular structure constituted of a plurality of columnar grains comprising a CoCrPt alloy and a grain boundary containing an oxide. The seed layer is formed by stacking a first seed layer, a second seed layer, and a third seed layer in which the first seed layer comprises Ti or Ti alloy having a hexagonal close-packed structure, the second seed layer comprises Cu, Ag, or Al having a face-centered cubic structure or an alloy containing at least one element selected therefrom, and the third seed layer comprises an Ni alloy having a face-centered cubic structure.
摘要翻译：本发明的实施例提供一种垂直磁记录介质，其能够减少晶粒之间的交换耦合，同时抑制磁记录层的晶粒尺寸的增加。根据一个实施例，垂直磁记录介质是通过在基底上层叠种子层，中间层，磁记录层和保护层而形成的。磁记录层具有由包括CoCrPt合金和含有氧化物的晶界的多个柱状晶粒构成的粒状结构。种子层通过层叠第一种子层，第二种子层和第三种子层而形成，其中第一种子层包含具有六方密堆积结构的Ti或Ti合金，第二籽晶层包含Cu，Ag，或具有面心立方结构的Al或含有选自其中的至少一种元素的合金，并且所述第三晶种层包括具有面心立方结构的Ni合金。

17. 发明申请

US20070217048A1 Perpendicular magnetic recording medium, method of evaluating magnetic properties of the same 失效
标题翻译：垂直磁记录介质，磁性能评价方法
公开(公告)号：US20070217048A1
公开(公告)日：2007-09-20
申请号：US11715132
申请日：2007-03-06
申请人： Hiroaki Nemoto , Ikuko Takekuma , Yuzuru Hosoe
发明人： Hiroaki Nemoto , Ikuko Takekuma , Yuzuru Hosoe
IPC分类号： G11B5/02 , G11B5/82
CPC分类号： G11B5/82 , G11B5/1278 , G11B5/65
摘要： Embodiments in accordance with the present invention provide a perpendicular magnetic recording medium which is easy to record, offers superior thermal stability of recording magnetization, and allows high-density recording. In one embodiment, a perpendicular magnetic layer with controlled magnetic properties is used as a magnetic storage layer of a perpendicular magnetic recording medium, the magnetic properties having been controlled such that an indicator σhsw [%] of the dispersion of magnetization switching fields in the perpendicular magnetic layer and an indicator Dn [nm] of the intensity of exchange interactions, in film surface directions, in the perpendicular magnetic layer satisfy inequalities σhsw/27+Dn/90 20. The indicators can be measured using a magnetometer.
摘要翻译：根据本发明的实施例提供了易于记录的垂直磁记录介质，提供了优异的记录磁化的热稳定性，并允许高密度记录。在一个实施例中，使用具有受控磁特性的垂直磁性层作为垂直磁记录介质的磁存储层，其磁特性已经被控制，使得该磁性性质的指示符σ< 垂直磁性层中的磁化开关场的分散和膜的表面方向上的交换相互作用强度的指示器D N n [nm]满足不等式sigmah < / SUB + / 27 + D / 90 <1和D 20。指标可以用磁力计测量。

18. 发明申请

US20090073599A1 Perpendicular magnetic recording medium and magnetic recording and reproducing apparatus using the same 审中-公开
标题翻译：垂直磁记录介质和使用其的磁记录和再现设备
公开(公告)号：US20090073599A1
公开(公告)日：2009-03-19
申请号：US12231513
申请日：2008-09-02
申请人： Hiroaki Nemoto , Ikuko Takekuma , Zhengang Zhang
发明人： Hiroaki Nemoto , Ikuko Takekuma , Zhengang Zhang
IPC分类号： G11B5/596 , G11B5/62
CPC分类号： G11B5/66 , G11B5/65 , G11B5/82
摘要： Embodiments of the present invention provide a perpendicular magnetic recording medium suitable for high density recording. According to one embodiment, a magnetic recording layer comprises four layers in which a first magnetic layer, a magnetic coupling layer, a second magnetic layer, and a third magnetic layer are formed above a substrate. The first magnetic layer and the second magnetic layer are perpendicular magnetization films containing an oxide, and ferromagnetically coupled with each other by way of the magnetic coupling layer, and they are, more preferably, a Co alloy layer containing an oxide. The third magnetic layer is ferromagnetically coupled with the second magnetic layer. The concentration of the oxide contained in the third magnetic layer is lower than the concentration of the oxide in the second recording layer, or the third magnetic layer does not contain the oxide. In this case, magnetic property is set for the anisotropic magnetic field Hk1 of the first magnetic layer and the anisotropic magnetic field Hk2 of the second magnetic layer, so as to satisfy: Hk1>Hk2.
摘要翻译：本发明的实施例提供适用于高密度记录的垂直磁记录介质。根据一个实施例，磁记录层包括四个层，其中在衬底上形成第一磁性层，磁耦合层，第二磁性层和第三磁性层。第一磁性层和第二磁性层是含有氧化物的垂直磁化膜，并且通过磁耦合层铁磁耦合，更优选是含有氧化物的Co合金层。第三磁性层与第二磁性层铁磁耦合。包含在第三磁性层中的氧化物的浓度低于第二记录层中的氧化物的浓度，或者第三磁性层不含氧化物。在这种情况下，对于第一磁性层的各向异性磁场Hk1和第二磁性层的各向异性磁场Hk2设定磁特性，以满足：Hk1> Hk2。

19. 发明申请

US20050142378A1 Perpendicular magnetic recording medium having alternatively layered structure of Co alloy and Pt thin film, its production method and apparatus 审中-公开
标题翻译：具有Co合金和Pt薄膜的层叠结构的垂直磁记录介质，其制造方法和装置
公开(公告)号：US20050142378A1
公开(公告)日：2005-06-30
申请号：US11012835
申请日：2004-12-14
申请人： Hiroaki Nemoto , Yuzuru Hosoe , Yoshiyuki Hirayama , Mineaki Kodama
发明人： Hiroaki Nemoto , Yuzuru Hosoe , Yoshiyuki Hirayama , Mineaki Kodama
IPC分类号： G11B5/673 , G11B5/64 , G11B5/65 , G11B5/851 , B05D5/12
CPC分类号： G11B5/65 , G11B5/851 , Y10T428/12875
摘要： Embodiments of the invention provide a granular medium structure and a significant increase of the Ku value of a magnetic material at the same time using a non-metal material, thereby obtaining a magnetic recording medium capable of high density recording. In one embodiment, a magnetic metal grain in a granular magnetic film made of magnetic metal grains and a non-magnetic material is obtained by laminating a ferromagnetic exchange metallic element that contains mainly Co or Fe and a Pt element alternately and the lamination period is set between about 0.35 nm and 0.9 nm, preferably between about 0.4 nm and 0.55 nm.
摘要翻译：本发明的实施例使用非金属材料同时提供磁性材料的粒状介质结构和显着提高磁性材料的K值，由此获得能够高密度的磁记录介质记录。在一个实施例中，由磁性金属颗粒和非磁性材料制成的颗粒状磁性膜中的磁性金属颗粒通过层叠主要包含Co或Fe和Pt元素的铁磁性交换金属元素交替地获得，并且设置层压周期在约0.35nm和0.9nm之间，优选在约0.4nm和0.55nm之间。

20. 发明申请

US20100188769A1 METHOD AND DEVICE FOR INFORMATION RECORDING/REPRODUCING AND INFORMATION RECORDING MEDIUM 失效
标题翻译：用于信息记录/再现和信息记录介质的方法和装置
公开(公告)号：US20100188769A1
公开(公告)日：2010-07-29
申请号：US12710738
申请日：2010-02-23
申请人： Hiroaki Nemoto , Hideki Saga , Hirofumi Sukeda
发明人： Hiroaki Nemoto , Hideki Saga , Hirofumi Sukeda
IPC分类号： G11B5/02
CPC分类号： G11B11/10578 , G11B5/314 , G11B11/10502 , G11B11/10528 , G11B11/10576 , G11B2005/0005 , G11B2005/0021
摘要： In an information recording/reproducing method performing a thermo-magnetic recording, a tracking offset value of a recording light spot and/or a tracking offset value of a magnetic flux detecting element is changed in accordance with a radial position at which a tracking is performed at the present time, to make a direction of a magnetic wall of a recording magnetic domain in accord with a longitudinal direction of the magnetic flux detecting element. Alternatively, a shape of a heated area is changed to be in accord with the direction of the magnetic flux detecting means at respective radial position, to make the direction of the magnetic wall of the recording magnetic domain in accord with the longitudinal direction of the magnetic flux detecting element.
摘要翻译：在执行热磁记录的信息记录/再现方法中，根据执行跟踪的径向位置改变记录光点的跟踪偏移值和/或磁通量检测元件的跟踪偏移值目前为了根据磁通量检测元件的纵向方向制造记录磁畴的磁壁的方向。或者，加热区域的形状根据磁通检测单元的径向位置的方向变化，使得记录磁畴的磁壁的方向与磁性体的长度方向一致通量检测元件。

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