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公开(公告)号：US07169487B2
公开(公告)日：2007-01-30
申请号：US10319566
申请日：2002-12-16
申请人： Hisao Kawai , Teiichiro Umezawa , Hirotaka Tanaka , Masaki Uemura
发明人： Hisao Kawai , Teiichiro Umezawa , Hirotaka Tanaka , Masaki Uemura
CPC分类号： G11B5/7325 , G11B5/64
摘要： In a magnetic recording medium including a glass substrate (1) having a principal surface on which at least a magnetic layer (4) is formed, the magnetic recording medium has a coercive force of 2500 oersted or more in a circumferential direction thereof. The principal surface of the glass substrate is provided with a texture having a predetermined surface roughness so that the magnetic layer is given circumferential magnetic anisotropy. The magnetic recording medium further includes a magnetic anisotropy inducing layer (2) formed between the glass substrate and the magnetic layer so that the magnetic recording medium has an oriented ratio (OR) of 1.1 or more. The oriented ratio (OR) is defined as a ratio of a magnetic characteristic in circumferential direction to another magnetic characteristic in the radial direction.
摘要翻译： 在包括具有至少形成有磁性层（4）的主表面的玻璃基板（1）的磁记录介质中，磁记录介质在其圆周方向上具有2500奥斯特或更大的矫顽力。 玻璃基板的主表面设置有具有预定表面粗糙度的纹理，使得磁性层具有圆周磁各向异性。 磁记录介质还包括形成在玻璃基板和磁性层之间的磁各向异性诱导层（2），使得磁记录介质具有1.1或更大的取向比（OR）。 取向比（OR）定义为圆周方向的磁特性与径向的另一磁特性的比率。
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公开(公告)号：US06916558B2
公开(公告)日：2005-07-12
申请号：US10778186
申请日：2004-02-17
CPC分类号： G11B5/732 , G11B5/66 , G11B5/7325 , Y10T428/24942
摘要： In a magnetic disk having a glass substrate, an amorphous underlayer is formed on the glass substrate. A magnetic layer is formed on the amorphous underlayer. The glass substrate is provided with a texture formed to induce magnetic anisotropy in the magnetic layer. The amorphous underlayer contains a group IVa element on a glass substrate side and a group Va element on a magnetic layer side.
摘要翻译： 在具有玻璃基板的磁盘中，在玻璃基板上形成无定形底层。 在无定形底层上形成磁性层。 玻璃基板具有形成为在磁性层中引起磁各向异性的纹理。 无定形底层包含玻璃基板侧的IVa族元素和磁性层侧的Va族元素。
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公开(公告)号：US09005699B2
公开(公告)日：2015-04-14
申请号：US11862410
申请日：2007-09-27
申请人： Yoshiaki Sonobe , Teiichiro Umezawa , Koichi Wago
发明人： Yoshiaki Sonobe , Teiichiro Umezawa , Koichi Wago
摘要： A method for manufacturing a magnetic recording medium includes the steps of (a) forming a perpendicular magnetic recording layer and (b) applying an ion beam to regions between tracks of the perpendicular magnetic recording layer so as to form separation regions for magnetically separating the tracks from each other. In the step (a), a continuous film layer composed of a multilayer film is formed, and CoB layers and Pd layers are laminated in the multilayer film. In the step (b), the CoB layers and the Pd layers are melted by the ion beam so as to form an alloy of metals contained in the CoB layers and the Pd layers to thereby form the separation regions.
摘要翻译： 一种制造磁记录介质的方法包括以下步骤：（a）形成垂直磁记录层，和（b）将离子束施加到垂直磁记录层的轨道之间的区域，以便形成用于磁分离轨道的分离区域 从彼此。 在步骤（a）中，形成由多层膜构成的连续膜层，并且在多层膜中层叠CoB层和Pd层。 在步骤（b）中，CoB层和Pd层通过离子束熔化，以形成CoB层和Pd层中所含的金属的合金，从而形成分离区域。
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34.发明授权公开(公告)号：US08795857B2
公开(公告)日：2014-08-05
申请号：US12665271
申请日：2008-09-24
IPC分类号： G11B5/66
摘要： A perpendicular magnetic recording medium of the invention is characterized by having, on a disk substrate 110, a soft magnetic layer 14, a magnetic recording layer 22, a continuous layer 24 magnetically continuous in the in-plane direction of the substrate, a blocking layer 25 for blocking shock imposed on the continuous layer, and a medium protective layer 28 containing carbon formed on the blocking layer.
摘要翻译： 本发明的垂直磁记录介质的特征在于，在盘基板110上具有在基板的面内方向上磁连续的软磁层14，磁记录层22，连续层24，阻挡层 25，用于阻挡施加在连续层上的冲击，以及包含形成在阻挡层上的碳的介质保护层28。
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公开(公告)号：US08697261B2
公开(公告)日：2014-04-15
申请号：US12934979
申请日：2009-03-25
申请人： Teiichiro Umezawa
发明人： Teiichiro Umezawa
IPC分类号： G11B5/66
CPC分类号： G11B5/7325 , G11B5/65 , G11B5/66
摘要： An object of the present invention is to increase an electromagnetic transducing characteristic (in particular, SNR) by further promoting separation and isolation of magnetic grains of a magnetic recording layer (122) in a perpendicular magnetic recording medium (100). Thus, a typical structure of the perpendicular magnetic recording medium (100) according to the present invention includes, on a substrate (110), at least a non-magnetic granular layer (120) having a granular structure in which a grain boundary part including one or a plurality of oxides is formed between non-magnetic grains each continuously grown in a columnar shape and a magnetic recording layer (122) formed continuously with the non-magnetic granular layer (120) and having a granular structure in which a grain boundary part including one or a plurality of oxides is formed between magnetic grains continuously grown in a columnar shape in this order, and at least one oxide included in the grain boundary part of the non-magnetic granular layer (120) and at least one oxide included in the grain boundary part of the magnetic recording layer (122) are oxides of a same composition.
摘要翻译： 本发明的目的是通过进一步促进垂直磁记录介质（100）中的磁记录层（122）的磁性颗粒的分离和隔离来增加电磁感应特性（特别是SNR）。 因此，根据本发明的垂直磁记录介质（100）的典型结构在基板（110）上至少包括具有颗粒结构的非磁性颗粒层（120），其中包括 在圆柱状连续生长的非磁性颗粒和与非磁性颗粒层（120）连续形成的磁记录层（122）之间形成一个或多个氧化物，并且具有颗粒结构，其中晶界 依次形成以柱状连续生长的磁性颗粒和包含在非磁性粒状层（120）的晶界部分中的至少一种氧化物和包含至少一种氧化物的包含一种或多种氧化物的部分 在磁记录层（122）的晶界部分是具有相同组成的氧化物。
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公开(公告)号：US08603650B2
公开(公告)日：2013-12-10
申请号：US10576755
申请日：2005-06-29
IPC分类号： G11B5/673
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。磁记录层由含有硅（Si）或硅（Si）的氧化物的粒状结构的铁磁层5构成， 在含有钴（Co）的晶粒之间，具有包含钴（Co）或Co合金的第一层的堆叠层7和包含钯（Pd）或铂（Pt）的第二层的间隔层6和介于铁磁性 层5和堆叠层7.在氩气气氛中通过溅射在基板1上形成铁磁层5之后，层叠层7通过在氩气气氛中以比形成 铁磁层5。
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37.发明授权公开(公告)号：US08309239B2
公开(公告)日：2012-11-13
申请号：US12594092
申请日：2008-03-28
IPC分类号： G11B5/66
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：US08003237B2
公开(公告)日：2011-08-23
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
IPC分类号： G11B5/66
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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39.发明授权公开(公告)号：US07983003B2
公开(公告)日：2011-07-19
申请号：US11485328
申请日：2006-07-13
IPC分类号： G11B5/82
CPC分类号： G11B5/667 , G11B5/8404
摘要： A perpendicular magnetic recording medium 10 adapted to be mounted in a perpendicular magnetic recording type hard disk drive and including a disk-shaped disk base 12, a soft magnetic layer 14 formed on the disk base 12, and a perpendicular magnetic recording layer 16 formed on the soft magnetic layer 14, wherein, at respective portions of the soft magnetic layer 14, directional distribution of easy magnetization axes of magnetic particles included In each of the respective portions is isotropic with respect to respective directions in the main surface of the soft magnetic layer 14.
摘要翻译： 适用于垂直磁记录型硬盘驱动器的垂直磁记录介质10，包括盘形盘基座12，形成在盘基座12上的软磁层14和垂直磁记录层16， 软磁性层14，其中，在软磁性层14的各个部分，包含的磁性粒子容易磁化轴的方向分布在各个部分中，相对于软磁性层主表面的各个方向各向同性 14。
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40.发明授权公开(公告)号：US07955723B2
公开(公告)日：2011-06-07
申请号：US11887539
申请日：2006-03-27
申请人： Teiichiro Umezawa , Yoshiaki Sonobe , Kong Kim
发明人： Teiichiro Umezawa , Yoshiaki Sonobe , Kong Kim
CPC分类号： G11B5/667
摘要： A perpendicular magnetic recording medium comprising a pair of soft magnetic layers that are laminated via a non-magnetic layer and antiparallel-coupled to each other and that are provided between a non-magnetic substrate and a magnetic recording layer, wherein spike noise and medium noise can be positively suppressed when information recording and reproduction are carried out at high recording surface density. At least one pair of soft magnetic layers are laid and formed via a non-magnetic layer on a substrate of a non-magnetic material so that magnetic characteristics obtained by integrating the pair of soft magnetic layers have a magnetic hysteresis to thereby prevent the formation of a magnetic domain wall.
摘要翻译： 一种垂直磁记录介质，包括通过非磁性层层叠并且反平行耦合并且设置在非磁性基板和磁记录层之间的一对软磁性层，其中尖峰噪声和介质噪声 当以高记录表面密度进行信息记录和再现时，可以被积极地抑制。 至少一对软磁性层通过非磁性材料的基板上的非磁性层铺设并形成，使得通过对该一对软磁性层的积分而获得的磁特性具有磁滞，从而防止形成 磁畴壁。
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