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公开(公告)号：US08057926B2
公开(公告)日：2011-11-15
申请号：US12666561
申请日：2008-09-26
IPC分类号： G11B5/66
摘要： The present invention provides a perpendicular magnetic recording medium that can reduce noise by further size reduction and isolation of magnetic grains in a magnetic recording layer and can increase the recording density by improvement of the SNR. A typical configuration of a perpendicular magnetic recording medium according to the present invention is a perpendicular magnetic recording medium having a magnetic recording layer with a granular structure in which non-magnetic grain boundary portions are formed between magnetic grains that have grown continuously in a columnar shape, wherein the grain boundary portions contain a plurality of kinds of oxides.
摘要翻译： 本发明提供一种能够通过磁记录层中的磁性颗粒的进一步的尺寸减小和隔离来降低噪声的垂直磁记录介质，并且可以通过提高SNR来提高记录密度。 根据本发明的垂直磁记录介质的典型结构是具有具有颗粒结构的磁记录层的垂直磁记录介质，其中在磁性颗粒之间形成非磁性晶界部分，该磁性颗粒连续生长成柱状 其中，晶界部分含有多种氧化物。
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2.发明申请公开(公告)号：US20110244119A1
公开(公告)日：2011-10-06
申请号：US13164186
申请日：2011-06-20
IPC分类号： B05D5/12
摘要： A vertical magnetic recording disc (100) includes a base (10), a magnetic recording layer (22), and a medium protection layer (26). The magnetic recording layer (22) is a ferromagnetic layer having a granular structure where a granular portion is formed. The medium protection layer (26) contains nitrogen (N) atoms and carbon (C) atoms with a number ratio (N/C) in a range from 0.050 to 0.150. In a Raman spectrum obtained by exciting the medium protection layer (26) by argon ion laser light of wavelength 514.5 nm, from which a fluorescence is removed, the peak ratio Dh/Gh is in a range from 0.70 to 0.95, when a D peak Dh appearing in the vicinity of 1350 cm−1 is separated from G peak Gh appearing in the vicinity of 1520 cm−1 by the Gauss function.
摘要翻译： 垂直磁记录盘（100）包括基座（10），磁记录层（22）和介质保护层（26）。 磁记录层（22）是形成粒状部的粒状结构的铁磁层。 介质保护层（26）含有氮（N）原子和碳（C）原子，其数量比（N / C）在0.050至0.150的范围内。 在通过从其去除荧光的波长514.5nm的氩离子激光激发介质保护层（26）而获得的拉曼光谱中，峰值比Dh / Gh在0.70至0.95的范围内，当D峰 出现在1350cm-1附近的Dh通过高斯函数与在1520cm -1附近出现的G峰Gh分离。
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3.发明申请公开(公告)号：US20110111262A1
公开(公告)日：2011-05-12
申请号：US12934975
申请日：2009-03-25
申请人： Teiichiro Umezawa , Masafumi Ishiyama , Tokichiro Sato , Kenji Ayama , Takahiro Onoue , Junichi Horikawa
发明人： Teiichiro Umezawa , Masafumi Ishiyama , Tokichiro Sato , Kenji Ayama , Takahiro Onoue , Junichi Horikawa
摘要： An object of the present invention is to provide a method of manufacturing a perpendicular magnetic recording medium (100) in which both of a coercive force Hc and reliability can be achieved at a higher level even with heating at the time of forming a medium protective layer (126) and to provide the perpendicular magnetic recording medium (100). Thus, in a typical structure of the present invention, in the method of manufacturing the perpendicular magnetic recording medium (100) including at least a magnetic recording layer (122b), which is a ferromagnetic layer of a granular structure in which a non-magnetic grain boundary part is formed between crystal grains each grown in a columnar shape, and a medium protective layer (126) with carbon hydride as a main component in this order on a disk base (110), the method includes a magnetic recording layer forming step of forming the magnetic recording layer (122b) so that the grain boundary part contains oxides of a plurality of types and a medium protective layer forming step of forming the medium protective layer (126) in a state where the disk base (110) having the magnetic recording layer (122b) formed thereon is heated at 160 to 200 degrees Celsius.
摘要翻译： 本发明的目的是提供一种制造垂直磁记录介质（100）的方法，其中即使在形成介质保护层时加热也可以在更高的水平上实现矫顽力Hc和可靠性 （126）并提供垂直磁记录介质（100）。 因此，在本发明的典型结构中，在制造至少包括磁记录层（122b）的垂直磁记录介质（100）的制造方法中，所述磁记录层是粒状结构的铁磁层，其中非磁性 在圆盘基体（110）上依次形成以圆柱状生长的晶粒和碳氢化合物作为主要成分的介质保护层（126）之间的晶界部分，该方法包括磁记录层形成步骤 形成磁记录层（122b），使得晶界部分包含多种类型的氧化物和形成介质保护层（126）的介质保护层形成步骤，所述介质保护层形成步骤处于具有 在其上形成的磁记录层（122b）在160至200摄氏度下被加热。
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公开(公告)号：US09240204B2
公开(公告)日：2016-01-19
申请号：US13112323
申请日：2011-05-20
摘要： A perpendicular magnetic disk is provided. The disk includes, on a base and in the order from bottom, a first granular magnetic layer group including a plurality of magnetic layers each having a granular structure, a non-magnetic layer having Ru or a Ru alloy as a main component, a second granular magnetic layer group including a plurality of magnetic layers each having the granular structure, and an auxiliary recording layer having a CoCrPtRu alloy as a main component. Layers closer to a front surface among the plurality of magnetic layers included in the first granular magnetic layer group having an equal or smaller content of Pt. Layers closer to the front surface among the plurality of magnetic layers included in the second granular magnetic layer group having an equal or smaller content of Pt and having an equal or larger content of an oxide.
摘要翻译： 提供垂直磁盘。 该盘在基部上并且从底部开始依次包括具有粒状结构的多个磁性层的第一粒状磁性层组，具有Ru或Ru合金作为主要成分的非磁性层，第二 包括具有颗粒结构的多个磁性层的粒状磁性层组以及以CoCrPtRu合金为主要成分的辅助记录层。 更靠近Pt含量相同或更小的第一粒状磁性层组中包含的多个磁性层中的前表面。 在具有等于或更小含量的Pt并且具有相等或更大含量的氧化物的第二粒状磁性层组中包含的多个磁性层中更靠近前表面的层。
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公开(公告)号：US20120070692A1
公开(公告)日：2012-03-22
申请号：US13048139
申请日：2011-03-15
申请人： Tokichiro Sato , Takenori Kajiwara
发明人： Tokichiro Sato , Takenori Kajiwara
IPC分类号： G11B5/33
CPC分类号： G11B5/7325
摘要： [Problem] To make a film thinner while keeping a function as an auxiliary recording layer, and improve an SNR and an overwrite characteristic.[Solution] A typical structure of a perpendicular magnetic disk according to the present invention includes, on a base, a granular magnetic layer 160 and an auxiliary recording layer 180 disposed on the granular magnetic layer 160. The granular magnetic layer 160 has a granular structure in which a grain boundary part is formed with segregation of a non-magnetic substance having an oxide as a main component around magnetic particles having a CoCrPt alloy a main component growing in a columnar shape. The auxiliary recording layer 180 has a CoCrPtRu alloy as a main component, and has a film thickness of 1.5 nm to 4.0 nm.
摘要翻译： [问题]在保持作为辅助记录层的功能的同时使薄膜更薄，并且提高SNR和覆盖特性。 [解决方案]根据本发明的垂直磁盘的典型结构在基体上包括设置在粒状磁性层160上的粒状磁性层160和辅助记录层180.粒状磁性层160具有粒状结构 其中晶界部分以具有生长为柱状的主要成分的CoCrPt合金的磁性颗粒周围的以氧化物为主要成分的非磁性物质的偏析形成。 辅助记录层180具有CoCrPtRu合金作为主要成分，并具有1.5nm至4.0nm的膜厚度。
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公开(公告)号：US20110311841A1
公开(公告)日：2011-12-22
申请号：US13133124
申请日：2009-12-07
申请人： Chiyo Saito , Tokichiro Sato , Takenori Kajiwara
发明人： Chiyo Saito , Tokichiro Sato , Takenori Kajiwara
摘要： Provided are a magnetic disk comprising a granular magnetic recording layer which causes less noise even with a recording capacity thereof of 250 G or more bits per square inch; and a method for manufacturing the same. The magnetic disk according to the present invention comprises: a granular magnetic recording layer (20) which is formed on a disk substrate 10 directly or via an intermediate layer and which has non-magnetic regions between granular columnar particles; and an auxiliary recording layer (22) which is formed on the granular magnetic recording layer 20 and which causes exchange interaction among the granular columnar particles, wherein the auxiliary recording layer (22) contains 0.1 to 3 moles of oxygen.
摘要翻译： 提供一种磁盘，其包括粒状磁记录层，即使其记录容量为每平方英寸250G或更多位，也会产生较小的噪声; 及其制造方法。 根据本发明的磁盘包括：粒状磁记录层（20），其直接或经由中间层形成在盘基板10上，并且在颗粒状柱状颗粒之间具有非磁性区域; 和形成在颗粒状磁记录层20上并且引起颗粒状柱状颗粒之间的交换相互作用的辅助记录层（22），其中辅助记录层（22）含有0.1至3摩尔的氧。
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7.发明申请公开(公告)号：US20100255348A1
公开(公告)日：2010-10-07
申请号：US12751237
申请日：2010-03-31
摘要： A perpendicular magnetic recording medium 100 has, over a substrate, at least a magnetic recording layer 122 with a granular structure in which nonmagnetic grain boundaries are formed between magnetic grains continuously grown into a columnar shape. The magnetic grains of the magnetic recording layer 122 contain Co, Cr, and Pt. The magnetic recording layer 122 contains at least one oxide selected from a group A including SiO2, TiO2, and Cr2O3, at least one oxide selected from a group B consisting of oxides each having a larger Gibbs free energy ΔG than the group A, and a reducing agent adapted to reduce the oxides of the group B.
摘要翻译： 垂直磁记录介质100在衬底上具有至少具有粒状结构的磁记录层122，其中在连续生长成柱状的磁性颗粒之间形成非磁性晶界。 磁记录层122的磁性颗粒含有Co，Cr和Pt。 磁记录层122包含选自包括SiO 2，TiO 2和Cr 2 O 3的组A中的至少一种氧化物，选自B组的氧化物中的至少一种氧化物，其组分比A组具有更大的Gibbs自由能＆Dgr; G， 以及适合于还原B族氧化物的还原剂。
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8.发明申请公开(公告)号：US20100247964A1
公开(公告)日：2010-09-30
申请号：US12749854
申请日：2010-03-30
CPC分类号： G11B5/8404 , G11B5/65 , G11B5/667 , G11B5/7325 , G11B5/82
摘要： A perpendicular magnetic recording medium comprises a magnetic recording layer that records a signal, an underlayer formed of Ru or Ru compound below the magnetic recording layer, a non-magnetic layer formed of a non-magnetic material below the underlayer to control crystal orientation of the underlayer, a soft magnetic layer provided below the non-magnetic layer, and a substrate on which the magnetic recording layer, the underlayer, the non-magnetic layer, and the soft magnetic layer are formed. The non-magnetic layer comprises a first non-magnetic layer formed above the soft magnetic layer and a second non-magnetic layer formed above the first non-magnetic layer. The first non-magnetic layer is formed of amorphous Ni compound while the second non-magnetic layer is formed of crystalline Ni or crystalline Ni compound.
摘要翻译： 垂直磁记录介质包括记录信号的磁记录层，在磁记录层下方由Ru或Ru化合物形成的底层，在底层下方由非磁性材料形成的非磁性层，以控制晶体取向 底层，设置在非磁性层下方的软磁性层以及形成有磁记录层，底层，非磁性层和软磁性层的基板。 非磁性层包括形成在软磁层上的第一非磁性层和形成在第一非磁性层之上的第二非磁性层。 第一非磁性层由非晶Ni化合物形成，而第二非磁性层由结晶的Ni或结晶的Ni化合物形成。
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公开(公告)号：US08431258B2
公开(公告)日：2013-04-30
申请号：US12749854
申请日：2010-03-30
IPC分类号： G11B5/66
CPC分类号： G11B5/8404 , G11B5/65 , G11B5/667 , G11B5/7325 , G11B5/82
摘要： A perpendicular magnetic recording medium comprises a magnetic recording layer that records a signal, an underlayer formed of Ru or Ru compound below the magnetic recording layer, a non-magnetic layer formed of a non-magnetic material below the underlayer to control crystal orientation of the underlayer, a soft magnetic layer provided below the non-magnetic layer, and a substrate on which the magnetic recording layer, the underlayer, the non-magnetic layer, and the soft magnetic layer are formed. The non-magnetic layer comprises a first non-magnetic layer formed above the soft magnetic layer and a second non-magnetic layer formed above the first non-magnetic layer. The first non-magnetic layer is formed of amorphous Ni compound while the second non-magnetic layer is formed of crystalline Ni or crystalline Ni compound.
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公开(公告)号：US20120129009A1
公开(公告)日：2012-05-24
申请号：US13112433
申请日：2011-05-20
申请人： Tokichiro Sato , Takenori Kajiwara
发明人： Tokichiro Sato , Takenori Kajiwara
IPC分类号： G11B5/66
CPC分类号： G11B5/66
摘要： [Summary][Problem] An object is to make a film thinner while keeping the function as an auxiliary recording layer and increase an SNR.[Solution] A structure of the perpendicular magnetic disk 100 according to the present invention includes, on a base 110, a granular magnetic layer 160 and an auxiliary recording layer 180 disposed above the granular magnetic layer, the granular magnetic layer having a granular structure in which a non-magnetic substance having an oxide as a main component is segregated around magnetic particles having a CoCrPt alloy as a main ingredient growing in a columnar shape to form a grain boundary part, and the auxiliary recording layer having a CoCrPtRu alloy as a main component and further containing, as a accessory component, a metal forming passivity and not being an antiferromagnet.
摘要翻译： [摘要]一个目的是使薄膜变薄，同时保持功能作为辅助记录层并增加SNR。 [解决方案]根据本发明的垂直磁盘100的结构在基体110上包括设置在粒状磁性层上方的粒状磁性层160和辅助记录层180，该颗粒状磁性层具有粒状结构 其以氧化物为主要成分的非磁性物质以围绕作为主要成分的CoCrPt合金的磁性颗粒围绕形成晶界部分而分离，并且具有CoCrPtRu合金作为主要的辅助记录层 作为辅助成分进一步含有被形成金属的物质，而不是反铁磁体。
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