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公开(公告)号：US09349404B2
公开(公告)日：2016-05-24
申请号：US13149613
申请日：2011-05-31
Applicant: Teiichiro Umezawa , Kazuaki Sakamoto
Inventor： Teiichiro Umezawa , Kazuaki Sakamoto
CPC classification number: G11B5/7325
Abstract: [Problem] A perpendicular magnetic disk with an improved SNR and an increased recording density by further improving crystal orientation of a preliminary ground layer formed of an Ni-base alloy is provided.[Solution] A typical structure of the perpendicular magnetic disk according to the present invention includes, on a base 110, a soft magnetic layer 130, a Ta alloy layer 140 provided on the soft magnetic layer 130, an Ni alloy layer 142 provided on the Ta alloy layer 140, a ground layer 150 provided on the Ni alloy layer 142 and having Ru as a main component, and a granular magnetic layer 160 provided on the ground layer 150. The Ta alloy layer 140 is a layer containing 10 atomic percent or more and 45 atomic percent or less Ta and having amorphous and soft magnetic properties.
Abstract translation: [问题]提供了通过进一步改善由Ni基合金形成的预备接地层的晶体取向而具有改善的SNR和增加的记录密度的垂直磁盘。 [解决方案]根据本发明的垂直磁盘的典型结构在基底110上包括软磁层130，设置在软磁层130上的Ta合金层140，设置在软磁层130上的Ni合金层142 Ta合金层140，设置在Ni合金层142上并具有Ru作为主要成分的接地层150和设置在接地层150上的粒状磁性层160.Ta合金层140是含有10原子％或 多于45原子％或更少的Ta，并具有无定形和软磁性能。
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2.发明授权公开(公告)号：US09159351B2
公开(公告)日：2015-10-13
申请号：US12738201
申请日：2008-10-14
Applicant: Kazuaki Sakamoto , Kong Kim , Takahiro Onoue , Masafumi Ishiyama , Teiichiro Umezawa , Kenji Ayama
Inventor： Kazuaki Sakamoto , Kong Kim , Takahiro Onoue , Masafumi Ishiyama , Teiichiro Umezawa , Kenji Ayama
CPC classification number: G11B5/732 , G11B5/66 , G11B5/7325
Abstract: A perpendicular magnetic recording medium includes a substrate, a soft magnetic layer, a pre-underlayer, an underlayer, and a main recording layer serving as a magnetic recording layer. The pre-underlayer contains seed crystal grains that serve as a base for crystal grains of the underlayer, and an addition substance that is added between the seed crystal grains and composed of an element having an atomic radius smaller than that of an element forming the seed crystal grains.
Abstract translation: 垂直磁记录介质包括基板，软磁层，预底层，底层和用作磁记录层的主记录层。 预底层包含用作底层晶粒的基底的籽晶粒，以及添加在籽晶粒之间并由原子半径小于形成种子的元素的元素构成的添加物质 晶粒。
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3.发明授权公开(公告)号：US09093100B2
公开(公告)日：2015-07-28
申请号：US13849176
申请日：2013-03-22
Applicant: WD Media (Singapore) PTE. LTD.
Inventor： Junichi Yasumori , Yoshiaki Sonobe
Abstract: A magnetic recording medium enabling excellent magnetic recording reproduction characteristics to be exhibited with the spacing loss reduced. The magnetic recording medium has a magnetic recording layer of a granular structure having nonmagnetic boundary portions between pillar-shaped magnetic particles on a nonmagnetic substrate, and an exchange coupling layer provided on the magnetic recording layer to add an action of exchange coupling the magnetic particles. Ion irradiation on the entire surface of the exchange coupling layer after layering the exchange coupling layer on the magnetic recording layer is performed.
Abstract translation: 能够显着地降低间隔损失的磁记录再现特性的磁记录介质。 磁记录介质具有在非磁性基板上的柱状磁性颗粒之间具有非磁性边界部分的粒状结构的磁记录层和设置在磁记录层上的交换耦合层，以增加磁性颗粒的交换作用。 执行在磁记录层上分层交换耦合层之后在交换耦合层的整个表面上的离子照射。
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4.发明授权公开(公告)号：US08908315B2
公开(公告)日：2014-12-09
申请号：US13074369
申请日：2011-03-29
Applicant: Tsuyoshi Ozawa
Inventor： Tsuyoshi Ozawa
CPC classification number: G11B5/455 , G11B5/3136 , G11B5/607 , G11B5/8408 , Y10T29/49764
Abstract: An evaluation method that can easily evaluate properties of a carbon protective film and a lubricant on a magnetic-disk surface or particularly, an evaluation method of a magnetic disk in which the properties of the magnetic-disk surface can be evaluated accurately so that a strict demand for interactions between the magnetic-disk surface and a head can be met is provided. In a state in which an element portion of the magnetic head provided with the head element portion that projects by thermal expansion is projected, after being brought into contact with a predetermined radial position on the surface of the rotating magnetic disk, the head is further made to perform seeking in a state in which the element portion is projected by a specified amount, whereby the properties of the carbon film or the lubricant formed on the magnetic-disk surface is evaluated.
Abstract translation: 可以容易地评价磁性保护膜和润滑剂在磁盘表面上的性能的评价方法，特别是可以精确地评价磁盘表面的性质的磁盘的评价方法，使得严格 提供了磁盘表面和头部之间的相互作用的需求。 在设置有通过热膨胀突出的头元件部分的磁头的元件部分被突出的状态下，在与旋转磁盘的表面上的预定径向位置接触之后，头进一步制成 在要素部分投影规定量的状态下进行寻找，由此评价形成在磁盘表面上的碳膜或润滑剂的性质。
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公开(公告)号：US08883249B2
公开(公告)日：2014-11-11
申请号：US12980062
申请日：2010-12-28
Applicant: Toshiaki Tachibana , Takahiro Onoue , Keiichi Kajita
Inventor： Toshiaki Tachibana , Takahiro Onoue , Keiichi Kajita
CPC classification number: G11B5/66 , C23C14/5806 , G11B5/65 , G11B5/84 , H01F1/06
Abstract: By improving sliding durability while ensuring a high SNR, an improvement in reliability and a further increase in recording density are to be achieved.The structure of a method of manufacturing a perpendicular magnetic recording medium according to the present invention includes: a main recording layer forming step of forming, on a substrate, at least a main recording layer formed of magnetic particles having a CoCrPt alloy as a main component and a non-magnetic grain boundary part having an oxide as a main component; a split layer forming step of forming a split layer having a Ru alloy or a Co alloy as a main component on the main recording layer; a first heating step of performing a heat treatment on the substrate after the split layer forming step; an auxiliary recording layer forming step of forming an auxiliary recording layer formed of a material having CoCrPt as a main component after the first heating step; a second heating step of performing a heat treatment on the substrate after the auxiliary recording layer forming step; and a protective layer forming step of forming a protective layer having carbon as a main component by CVD after the second heating step.
Abstract translation: 通过提高滑动耐久性同时确保高SNR，可以实现可靠性的提高和记录密度的进一步提高。 根据本发明的垂直磁记录介质的制造方法的结构包括：主记录层形成步骤，在基板上至少形成由具有CoCrPt合金作为主要成分的磁性颗粒形成的主记录层 和具有氧化物作为主要成分的非磁性晶界部分; 在主记录层上形成具有Ru合金或Co合金作为主要成分的分割层的分割层形成步骤; 第一加热步骤，在所述分裂层形成步骤之后对所述基板进行热处理; 在第一加热步骤之后形成由具有CoCrPt作为主要成分的材料形成的辅助记录层的辅助记录层形成步骤; 在辅助记录层形成步骤之后对衬底进行热处理的第二加热步骤; 以及保护层形成步骤，在第二加热步骤之后通过CVD形成以碳为主要成分的保护层。
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Patent Agency Ranking
6.发明授权公开(公告)号：US08758911B2
公开(公告)日：2014-06-24
申请号：US12602446
申请日：2008-05-30
Applicant: Yoshiaki Sonobe , Kong Kim
Inventor： Yoshiaki Sonobe , Kong Kim
CPC classification number: G11B5/656 , G11B5/66 , G11B5/667 , G11B5/7325
Abstract: A perpendicular magnetic recording medium is disclosed that includes a substrate, a main recording layer, a reinforcing layer, and a continuous layer which are overlaid in this order on the substrate. The reinforcing layer is provided between the main recording layer and the continuous layer so as to improve the S/N ratio of the magnetic recording medium and reduce the write fringing effect. The reinforcing layer has a granular structure. The saturation magnetization Ms of the reinforcing layer is higher than the saturation magnetization of the main recording layer.
Abstract translation: 公开了一种垂直磁记录介质，其包括在基板上依次重叠的基板，主记录层，加强层和连续层。 增强层设置在主记录层和连续层之间，以提高磁记录介质的S / N比并减小写入边缘效应。 增强层具有粒状结构。 加强层的饱和磁化强度Ms高于主记录层的饱和磁化强度。
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7.发明申请公开(公告)号：US20140044992A1
公开(公告)日：2014-02-13
申请号：US14051414
申请日：2013-10-10
Applicant: WD Media (Singapore) Pte. Ltd.
Inventor： Takahiro ONOUE
Abstract: A perpendicular magnetic recording medium 100 having a magnetic recording layer 122, wherein a particle diameter of crystal grains in layer 122 improves a SNR while a high coercive force is maintained. There also is at least a ground layer 118, a first magnetic recording layer 122a, and a second magnetic recording layer 122b in this order on a disk base 110. The first layer 122a and the second layer 122b are ferromagnetic layers, each having a granular structure in which a grain boundary part made of a non-magnetic substance is formed between crystal grains each grown in a columnar shape, and A
Abstract translation: 具有磁记录层122的垂直磁记录介质100，其中层122中的晶粒的粒径提高SNR，同时保持高的矫顽力。 在盘基座110上依次还有至少一个接地层118，第一磁记录层122a和第二磁记录层122b。第一层122a和第二层122b是铁磁性层，每层具有颗粒状 其中在以柱状形成的晶粒之间形成由非磁性物质制成的晶界部分的结构，并且当第一磁记录层122a中的晶粒的平均粒径为A时，A
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8.发明授权公开(公告)号：US08623529B2
公开(公告)日：2014-01-07
申请号：US12935215
申请日：2009-03-24
Applicant: Kouta Suzuki
Inventor： Kouta Suzuki
IPC: G11B5/66
CPC classification number: G11B5/725 , C10M107/38 , C10M111/04 , C10M171/00 , C10M177/00 , C10M2213/0606 , C10M2223/003 , C10N2230/06 , C10N2230/66 , C10N2240/204 , C10N2250/14 , C10N2280/00 , G11B5/66 , G11B5/8408
Abstract: An object of the present invention is to provide a perpendicular magnetic recording medium including a suitable lubricating layer with sufficient durability, moisture resistance, and contamination resistance and also maintaining an R/W characteristic. In a typical structure of the present invention, a method of manufacturing a perpendicular magnetic recording medium 100 including a magnetic recording layer 122, a medium protective layer 126, and a lubricating layer 128 in this order on a base 110 includes: a CF bond density measuring step of measuring a CF bond density of a lubricant; and a lubricating layer forming step of forming a lubricating layer with the lubricant when the measured CF bond density is 2.0×1022 to 2.7×1022 atoms/cm3.
Abstract translation: 本发明的目的是提供一种垂直磁记录介质，其包括具有足够的耐久性，耐湿性和耐污染性的合适的润滑层，并且还保持R / W特性。 在本发明的典型结构中，在基座110上依次制造包括磁记录层122，介质保护层126和润滑层128的垂直磁记录介质100的方法包括：CF键密度 测量润滑剂的CF键密度的测量步骤; 以及当测量的CF键密度为2.0×1022至2.7×1022原子/ cm3时，用润滑剂形成润滑层的润滑层形成步骤。
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公开(公告)号：US08551627B2
公开(公告)日：2013-10-08
申请号：US12666552
申请日：2008-09-24
Applicant: Akira Shimada , Ito Nakamura
Inventor： Akira Shimada , Ito Nakamura
IPC: G11B5/66
CPC classification number: G11B5/72 , G11B5/8408
Abstract: This invention provides a magnetic disk which can satisfactorily suppress the elution of internal components from an end face of a magnetic disk, and corrosion damage. The magnetic disk comprises a disk substrate, and a thin film including a magnetic layer, a carbon-based protective layer, and a lubricating layer provided in that order on the disk substrate. The main surface and the end face of the magnetic disk are covered with the carbonaceous protective layer. The carbon-based protective layer contains nitrogen at a part adjacent to the lubricating layer. The content of nitrogen atoms relative to the content of carbon atoms in the protective layer formed on the end face is equal to or more than the content of nitrogen atoms relative to the content of carbon atoms in the protective layer formed on the main surface.
Abstract translation: 本发明提供一种可以令人满意地抑制内部部件从磁盘的端面的洗脱以及腐蚀损坏的磁盘。 磁盘包括盘基片和在盘基片上依次设置有磁性层，碳基保护层和润滑层的薄膜。 磁盘的主表面和端面被碳质保护层覆盖。 碳基保护层在与润滑层相邻的部分含有氮。 氮原子相对于形成在端面上的保护层中的碳原子含量相对于主表面上形成的保护层中的碳原子含量为氮原子数以上。
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公开(公告)号：US08431257B2
公开(公告)日：2013-04-30
申请号：US12749147
申请日：2010-03-29
Applicant: Kong Kim , Hi Shin , Tomoko Seki , Satoshi Ishii
Inventor： Kong Kim , Hi Shin , Tomoko Seki , Satoshi Ishii
IPC: G11B5/66
Abstract: A perpendicular magnetic recording medium is used for information recording of a perpendicular magnetic recording type. The perpendicular magnetic recording medium includes a substrate, a soft magnetic layer, an underlayer, and a magnetic layer having a multilayered structure including a plurality of magnetic layers. The soft magnetic layer, the underlayer, and the magnetic layer are formed on the substrate. At least one of the magnetic layers includes CoPt magnetic grains containing oxide. The oxide includes at least one material selected from the group consisting of SiO2, TiO2, Cr2O3, Ta2O5, WO3, CoO, and Co3O4.
Abstract translation: 垂直磁记录介质用于垂直磁记录类型的信息记录。 垂直磁记录介质包括具有包括多个磁性层的多层结构的基板，软磁性层，底层和磁性层。 软磁性层，底层和磁性层形成在基板上。 至少一个磁性层包括含有氧化物的CoPt磁性颗粒。 氧化物包括选自SiO 2，TiO 2，Cr 2 O 3，Ta 2 O 5，WO 3，CoO和Co 3 O 4中的至少一种材料。
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