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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
CPC分类号： G11B5/7325
摘要： [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.
摘要翻译： [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
申请人： Kazuaki Sakamoto , Kong Kim , Takahiro Onoue , Masafumi Ishiyama , Teiichiro Umezawa , Kenji Ayama
发明人： Kazuaki Sakamoto , Kong Kim , Takahiro Onoue , Masafumi Ishiyama , Teiichiro Umezawa , Kenji Ayama
CPC分类号： G11B5/732 , G11B5/66 , G11B5/7325
摘要： 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.
摘要翻译： 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Magnetic recording medium having patterned auxiliary recording layer and method for manufacturing such magnetic recording medium 有权具有图案化辅助记录层的磁记录介质和用于制造这种磁记录介质的方法公开(公告)号：US08367228B2
公开(公告)日：2013-02-05
申请号：US12906414
申请日：2010-10-18
申请人： Yoshiaki Sonobe , Teiichiro Umezawa , Koichi Wago
发明人： Yoshiaki Sonobe , Teiichiro Umezawa , Koichi Wago
IPC分类号： G11B5/66
摘要： A method for manufacturing a magnetic recording medium for perpendicular magnetic recording includes the steps of forming a first magnetic layer which has magnetic crystal grains exhibiting perpendicular magnetic anisotropy and nonmagnetic substances for magnetically separating the magnetic crystal grains from each other at grain boundaries of the magnetic crystal grains, forming a second magnetic layer which has magnetic grains exchange-coupled to the magnetic crystal grains, a grain boundary width of the magnetic grains being smaller than a grain boundary width of the magnetic crystal grains, and forming separation regions which magnetically separate tracks from each other in regions between the tracks of the magnetic recording medium in at least the second magnetic layer. The separation regions are disposed substantially only in the second magnetic layer of the first magnetic layer and the second magnetic layer.
摘要翻译： 一种用于垂直磁记录的磁记录介质的制造方法包括以下步骤：形成具有垂直磁各向异性的磁性晶粒的第一磁性层和用于在磁性晶体的晶界处将磁性晶粒彼此磁分离的非磁性物质 形成具有磁性晶粒与磁性晶粒交换耦合的第二磁性层，所述磁性晶粒的晶界宽度小于所述磁性晶粒的晶界宽度，以及形成分离区域，其将磁道与 彼此在至少第二磁性层中的磁记录介质的轨道之间的区域中。 分离区域基本上仅设置在第一磁性层和第二磁性层的第二磁性层中。
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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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公开(公告)号：US20110268990A1
公开(公告)日：2011-11-03
申请号：US13096307
申请日：2011-04-28
申请人： Teiichiro UMEZAWA
发明人： Teiichiro UMEZAWA
IPC分类号： G11B5/00
摘要： An object of the present invention is to achieve thinning of an auxiliary recording layer while maintaining the function thereof to improve SNR.A representative configuration of a perpendicular magnetic disk according to the present invention includes, on abase, a granular magnetic layer 160, and a auxiliary recording layer 180 disposed as an upper layer of the granular magnetic layer 160, wherein the granular magnetic layer 160 has a granular structure in which a grain boundary portion is formed by segregation of a non-magnetic substance containing an oxide as a main component around magnetic particles containing a CoCrPt alloy grown in a columnar shape as a main component, and the auxiliary recording layer 180 contains a CoCrPtRu alloy as a main component and has a film thickness of 1.5 nm to 4.0 nm.
摘要翻译： 本发明的目的在于实现辅助记录层的薄化，同时保持其功能以提高SNR。 根据本发明的垂直磁盘的代表性配置包括粒状磁性层160和作为粒状磁性层160的上层设置的辅助记录层180，其中粒状磁性层160具有 颗粒结构，其中通过以包含以柱状形式生长的CoCrPt合金为主要成分的磁性颗粒的周围以包含以氧化物为主要成分的非磁性物质的偏析形成晶界部分，并且辅助记录层180含有 CoCrPtRu合金为主成分，膜厚为1.5nm〜4.0nm。
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6.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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7.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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8.发明申请公开(公告)号：US20100279151A1
公开(公告)日：2010-11-04
申请号：US12738201
申请日：2008-10-14
申请人： Kazuaki Sakamoto , Kong Kim , Takahiro Onoue , Masafumi Ishiyama , Teiichiro Umezawa , Kenji Ayama
发明人： Kazuaki Sakamoto , Kong Kim , Takahiro Onoue , Masafumi Ishiyama , Teiichiro Umezawa , Kenji Ayama
CPC分类号： G11B5/732 , G11B5/66 , G11B5/7325
摘要： 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.
摘要翻译： 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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公开(公告)号：US20090191331A1
公开(公告)日：2009-07-30
申请号：US12295550
申请日：2007-03-31
申请人： Teiichiro Umezawa , Takahiro Onoue , Chikara Takasu , Kong Kim
发明人： Teiichiro Umezawa , Takahiro Onoue , Chikara Takasu , Kong Kim
IPC分类号： B05D5/12
摘要： [Object] To provide a manufacturing method that can easily enhance a reversed domain nucleation magnetic field of a magnetic recording layer in a perpendicular magnetic recording medium having, over a substrate, a soft magnetic layer, the magnetic recording layer having a granular structure, and a continuous layer having a high perpendicular magnetic anisotropy.[Solution] A perpendicular magnetic recording medium manufacturing method according to this invention is characterized by including a soft magnetic layer forming step of forming a soft magnetic layer over a substrate, a magnetic recording layer forming step of forming a magnetic recording layer having a granular structure as an upper layer of the soft magnetic layer, a continuous layer forming step of forming a continuous layer having a perpendicular magnetic anisotropy as an upper layer or a lower layer of the magnetic recording layer, and a heating step of heating a medium, obtained by forming the continuous layer in the continuous layer forming step, for improving a value of a reversed domain nucleation magnetic field.
摘要翻译： 本发明提供一种能够容易地增强磁性记录层的反磁畴成核磁场的制造方法，该垂直磁记录介质在基板上具有软磁性层，具有粒状结构的磁记录层，以及 具有高垂直磁各向异性的连续层。 [解决方案]根据本发明的垂直磁记录介质制造方法的特征在于包括在基板上形成软磁性层的软磁性层形成步骤，形成具有粒状结构的磁记录层的磁记录层形成步骤 作为软磁性层的上层，形成具有垂直磁各向异性的连续层作为磁记录层的上层或下层的连续层形成步骤和加热介质的加热步骤，其通过 在连续层形成步骤中形成连续层，以改善反向畴状成核磁场的值。
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公开(公告)号：US09064518B2
公开(公告)日：2015-06-23
申请号：US13062640
申请日：2009-09-16
申请人： Takahiro Onoue , Teiichiro Umezawa
发明人： Takahiro Onoue , Teiichiro Umezawa
摘要： An object of the present invention is to provide a perpendicular magnetic recording medium the SNR of which is further improved while a high coercive force Hc is secured so that a higher recoding density can be achieved.The structure of a perpendicular magnetic recording medium 100 according to the present invention includes, on a base, at least a first magnetic recording layer 122a having a granular structure in which a non-magnetic grain boundary portion is formed between crystal particles grown in a columnar shape; a non-magnetic split layer 122b containing Ru disposed on the first magnetic layer; and a second magnetic recording layer 122c that is disposed on the split layer and that has a granular structure in which a non-magnetic grain boundary portion is formed between crystal particles grown in a columnar shape, wherein the first magnetic layer and the second magnetic layer contain oxides that form the grain boundary, and when an oxide content of the first magnetic layer is represented by A and an oxide content of the second magnetic layer is represented by B, a relationship between the oxide contents A/B is in the range of 0.5
摘要翻译： 本发明的目的是提供一种在保证高矫顽力Hc的同时进一步提高SNR的垂直磁记录介质，从而可以实现更高的记录密度。 根据本发明的垂直磁记录介质100的结构在基底上包括至少第一磁记录层122a，该第一磁记录层122a具有颗粒结构，其中在柱状生长的结晶颗粒之间形成非磁性晶界部分 形状; 包含设置在第一磁性层上的Ru的非磁性分离层122b; 以及第二磁记录层122c，其设置在分割层上，并且具有其中在柱状生长的晶体颗粒之间形成非磁性晶界部分的颗粒结构，其中第一磁性层和第二磁性层 含有形成晶界的氧化物，当第一磁性层的氧化物含量由A表示，第二磁性层的氧化物含量由B表示时，氧化物含量A / B的关系在 0.5
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