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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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12.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：US08142916B2
公开(公告)日：2012-03-27
申请号：US12594043
申请日：2008-03-28
IPC分类号： G11B5/66
CPC分类号： G11B5/7325 , G11B5/66
摘要： Provided is a magnetic recording medium which maintains high S/N ratio and coercive force (Hc) and has high recording density, even with fine magnetic particles, by further improving crystal orientation of a magnetic recording layer. The magnetic recording medium is provided with an orientation control layer (16), a nonmagnetic under layer (18), and a magnetic recording layer (22) on a substrate. The orientation control layer (16) has an fcc structure and a (111) plane parallel to the substrate. The under layer (18) has an hcp structure and a (0001) plane parallel to the substrate. An atomic distance of the (111) plane of the orientation control layer (16) is −0.2 Å to +0.15 Å to a lattice spacing of the under layer (18).
摘要翻译： 提供了通过进一步改善磁记录层的晶体取向，即使使用细小的磁性颗粒，仍然保持高S / N比和矫顽力（Hc）并且具有高记录密度的磁记录介质。 磁记录介质在基板上设置有取向控制层（16），非磁性底层（18）和磁记录层（22）。 取向控制层（16）具有fcc结构和平行于基板的（111）平面。 底层（18）具有hcp结构和平行于衬底的（0001）平面。 取向控制层（16）的（111）面的原子距离相对于下层（18）的晶格间距为-0.2到+0.15。
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15.发明授权Magnetic recording medium and method for manufacturing magnetic recording medium 有权磁记录介质及磁记录介质的制造方法公开(公告)号：US07833639B2
公开(公告)日：2010-11-16
申请号：US11862789
申请日：2007-09-27
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 magnetic recording medium for perpendicular magnetic recording includes a substrate, a granular layer having 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, and a continuous film layer having magnetic grains to be exchange-coupled to the magnetic crystal grains, the grain boundary width of the magnetic grains being smaller than that of the magnetic crystal grains, wherein separation regions for magnetically separating tracks from each other are disposed in regions between the tracks of the magnetic recording medium in at least the continuous film layer.
摘要翻译： 用于垂直磁记录的磁记录介质包括基板，具有垂直磁各向异性的磁性晶粒的颗粒层和用于在磁晶粒的晶界处磁性分离磁晶粒的非磁性物质，以及连续的膜层 具有与磁性晶粒交换耦合的磁性颗粒，磁性颗粒的晶界宽度小于磁性晶粒的晶界宽度，其中将磁道彼此分离磁道的分离区域设置在 所述磁记录介质至少在所述连续膜层中。
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16.发明申请公开(公告)号：US20100112379A1
公开(公告)日：2010-05-06
申请号：US12594092
申请日：2008-03-28
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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公开(公告)号：US20070148499A1
公开(公告)日：2007-06-28
申请号：US10576755
申请日：2005-06-29
CPC分类号： H01F10/007 , B82Y25/00 , G11B5/66 , G11B5/851 , G11B2005/0029 , H01F10/16 , H01F41/18
摘要： A magnetic disk 10 for use in perpendicular magnetic recording has at least a magnetic recording layer on a substrate 1. The magnetic recording layer is composed of a ferromagnetic layer 5 of a granular structure containing silicon (Si) or an oxide of silicon (Si) between crystal grains containing cobalt (Co), a stacked layer 7 having a first layer containing cobalt (Co) or a Co alloy and a second layer containing palladium (Pd) or platinum (Pt), and a spacer layer 6 interposed between the ferromagnetic layer 5 and the stacked layer 7. After forming the ferromagnetic layer 5 on the substrate 1 by sputtering in an argon gas atmosphere, the stacked layer 7 is formed by sputtering in the argon gas atmosphere at a gas pressure lower than that used when forming the ferromagnetic layer 5.
摘要翻译： 用于垂直磁记录的磁盘10在基板1上至少具有磁记录层。 磁记录层由包含钴（Co）的晶粒之间的含硅（Si）或硅（Si）的颗粒结构的铁磁层5构成，堆叠层7具有包含钴（Co）的第一层， 或Co合金和含有钯（Pd）或铂（Pt）的第二层，以及介于铁磁层5和堆叠层7之间的间隔层6。 在氩气气氛中通过溅射在基板1上形成铁磁层5之后，通过在氩气气氛中以低于形成铁磁层5时使用的气体压力的溅射形成堆叠层7。
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18.发明授权公开(公告)号：US07220500B1
公开(公告)日：2007-05-22
申请号：US09540646
申请日：2000-03-31
申请人： Hiroshi Tomiyasu , Teiichiro Umezawa , Genshichi Hata , Takashi Morikawa , Masato Kobayashi , Masashi Suzuki , Satoshi Yokota , Tsuyoshi Watanabe
发明人： Hiroshi Tomiyasu , Teiichiro Umezawa , Genshichi Hata , Takashi Morikawa , Masato Kobayashi , Masashi Suzuki , Satoshi Yokota , Tsuyoshi Watanabe
CPC分类号： G11B5/732 , G11B5/40 , G11B5/455 , G11B5/66 , G11B5/7325
摘要： There is disclosed a magnetic recording medium in which a seed layer, under layer, intermediate layer, first magnetic layer, nonmagnetic layer, second magnetic layer, protective layer, and lubricant layer are successively laminated on a glass substrate, the nonmagnetic layer is constituted of an alloy containing Cr and C, and the magnetic layer is constituted of an alloy containing Co and Pt. The under layer includes at least the seed layer for finely dividing the crystal particles of the magnetic layer, the seed layer includes at least two or more layers of nonmagnetic films, and the intermediate layer formed of the material different from that of the nonmagnetic film is interposed between the nonmagnetic films. In measurement of the thermal stability of the magnetic recording medium, a head is used, the head includes a read/write element, and a write track width is twice or more as large as a read track width in the head.
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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：US20090081483A1
公开(公告)日：2009-03-26
申请号：US11909598
申请日：2006-03-20
申请人： Yoshiaki Sonobe , Teiichiro Umezawa , Kong Kim , Masaki Uemura
发明人： Yoshiaki Sonobe , Teiichiro Umezawa , Kong Kim , Masaki Uemura
CPC分类号： G11B5/7325 , G11B5/66
摘要： A magnetic disk 10 for use in perpendicular magnetic recording, which includes an underlayer 18, a size-reduction promoting layer 20 (nonmagnetic granular layer) of a granular structure, and a magnetic recording layer 22 having a ferromagnetic layer 32 of a granular structure. The size-reduction promoting layer 20 has an inorganic oxide matrix and nonmagnetic metal crystal grains and is disposed between the underlayer 18 and the ferromagnetic layer 32, thereby reducing the size of magnetic crystal grains in the ferromagnetic layer 32.
摘要翻译： 用于垂直磁记录的磁盘10，其包括底层18，粒状结构的尺寸减小促进层20（非磁性粒状层）和具有粒状结构的铁磁层32的磁记录层22。 尺寸减小促进层20具有无机氧化物基体和非磁性金属晶粒，并且设置在底层18和铁磁层32之间，从而减小铁磁层32中的磁晶粒的尺寸。
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