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1.发明申请公开(公告)号：US20090311557A1
公开(公告)日：2009-12-17
申请号：US12295562
申请日：2007-03-31
申请人： Takahiro Onoue , Kong Kim , Yoshiaki Sonobe , Chikara Takasu
发明人： Takahiro Onoue , Kong Kim , Yoshiaki Sonobe , Chikara Takasu
CPC分类号： G11B5/667 , G11B5/65 , G11B5/66 , G11B5/7325
摘要： [Object] To achieve a high coercive force (Hc) and low-noise characteristics (high S/N ratio) through realization of both segregation of SiO2 and high perpendicular magnetic anisotropy by providing a two-layer structure having magnetic recording layers with different properties.[Solution] A magnetic disk for use in perpendicular magnetic recording, having at least an underlayer 5, a first magnetic recording layer 6, and a second magnetic recording layer 7 on a substrate in this order. The first magnetic recording layer 6 and the second magnetic recording layer 7 are each a ferromagnetic layer of a granular structure containing a nonmagnetic substance forming grain boundary portions between crystal grains containing at least Co (cobalt). Given that the content of the nonmagnetic substance in the first magnetic recording layer 6 is A mol % and the content of the nonmagnetic substance in the second magnetic recording layer 7 is B mol %, A>B.
摘要翻译： [目的]通过提供具有不同性质的磁记录层的双层结构，通过实现SiO 2的偏析和高垂直磁各向异性来实现高矫顽力（Hc）和低噪声特性（高S / N比） 。 [解决方案]用于垂直磁记录的磁盘，其依次在基板上至少具有底层5，第一磁记录层6和第二磁记录层7。 第一磁记录层6和第二磁记录层7分别是包含在至少包含Co（钴）的晶粒之间形成晶界部分的非磁性物质的粒状结构的铁磁层。 假设第一磁记录层6中的非磁性物质的含量为A摩尔％，第二磁记录层7中的非磁性物质的含量为B摩尔％，则A> B。
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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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3.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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4.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：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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公开(公告)号：US08298689B2
公开(公告)日：2012-10-30
申请号：US12602430
申请日：2008-05-30
申请人： Yoshiaki Sonobe , Kong Kim
发明人： Yoshiaki Sonobe , Kong Kim
IPC分类号： G11B5/66
CPC分类号： G11B5/667 , G11B5/7325 , G11B5/851
摘要： [PROBLEMS] To provide a process for producing a magnetic recording medium, which can simultaneously realize increased high recording density, high impact resistance, and prevention of corrosion, by providing an underlayer which, even when formed at a low gas pressure, can exhibit a high level of coercive force.[MEANS FOR SOLVING PROBLEMS] A process for producing a perpendicular magnetic recording medium, comprising the step of forming a nonmagnetic underlayer (18) having a granular structure, in which crystal particles are grown in a column form, on a substrate, and forming a magnetic recording layer (20) having a granular structure in which magnetic particles are grown in a column form. The process is characterized in that the underlayer (18) is any one of CoCr or CoCrX (wherein X is a nonmagnetic material), CoCr-oxide, and CoCrX-oxide, and the film forming gas pressure of the underlayer (18) is not more than 4 Pa.
摘要翻译： [问题]提供一种制造磁记录介质的方法，其可以同时实现增加的高记录密度，高抗冲击性和防止腐蚀，通过提供底层，即使在低气压下形成时， 高水平的矫顽力。 解决问题的方法一种垂直磁记录介质的制造方法，其特征在于，在基板上形成具有以柱状生长结晶粒子的具有粒状结构的非磁性底层（18）的工序， 磁性记录层（20）具有磁性颗粒以柱状生长的粒状结构。 该工艺的特征在于，底层（18）是CoCr或CoCrX（其中X是非磁性材料），CoCr-氧化物和CoCrX-氧化物中的任一种，并且底层（18）的成膜气体压力不是 超过4 Pa。
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7.发明申请公开(公告)号：US20100190035A1
公开(公告)日：2010-07-29
申请号：US12602446
申请日：2008-05-30
申请人： Yoshiaki Sonobe , Kong Kim
发明人： Yoshiaki Sonobe , Kong Kim
CPC分类号： G11B5/656 , G11B5/66 , G11B5/667 , G11B5/7325
摘要： [Problems] To provide a reinforcing layer between a main recording layer and a continuous layer so as to improve the S/N ratio of a magnetic recording medium and reduce the write fringing effect by the new configuration.[Means for Solving Problems] A perpendicular magnetic recording medium (100) includes a substrate (110), and a main recording layer (122), a reinforcing layer (124), and a continuous layer (126) which are overlaid in this order on the substrate. The reinforcing layer (124) has a granular structure. The saturation magnetization Ms of the reinforcing layer (124) is higher than the saturation magnetization of the main recording layer (122).
摘要翻译： 为了提高磁记录介质的S / N比，提供主记录层和连续层之间的增强层，通过新结构降低写入边缘效果。 解决问题的手段垂直磁记录介质（100）包括基板（110），主记录层（122），加强层（124）和连续层（126） 在基板上。 加强层（124）具有粒状结构。 加强层（124）的饱和磁化强度Ms高于主记录层（122）的饱和磁化强度。
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8.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
申请人： Yoshiaki Sonobe , Kong Kim
发明人： Yoshiaki Sonobe , Kong Kim
CPC分类号： G11B5/656 , G11B5/66 , G11B5/667 , G11B5/7325
摘要： 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.
摘要翻译： 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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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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10.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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