公开(公告)号：US07622204B2

公开(公告)日：2009-11-24

申请号：US11076114

申请日：2005-03-09

申请人： Tomoyuki Maeda ,  Akira Kikitsu ,  Soichi Oikawa ,  Takeshi Iwasaki

发明人： Tomoyuki Maeda ,  Akira Kikitsu ,  Soichi Oikawa ,  Takeshi Iwasaki

IPC分类号： G11B5/66

CPC分类号： G11B5/667 ,  G11B5/65 ,  G11B5/7325

摘要： A large grain diameter under-layer of at least one selected from Cu, Ni or Rh, comprising large average diameter crystalline grains of 50 nm or more than 50 nm with the (100) crystal plane of the grains oriented parallel to the substrate surface, was formed on a substrate. Then, a magnetic recording layer was deposited on the under-layer. The magnetic recording medium carrying this structure showed very small magnetic crystalline grains in magnetic layer, and excellent overwrite characteristics and signal to noise ratio at high recording density.

摘要翻译： 由Cu，Ni或Rh中选出的至少一种的大粒径底层，其中平均直径为100nm的平均直径的晶粒大于50nm或大于50nm， 形成在基板上。 然后，磁记录层沉积在底层上。 携带这种结构的磁记录介质在磁性层中显示出非常小的磁晶粒，并且在高记录密度下具有优异的重写特性和信噪比。

公开(公告)号：US07416794B2

公开(公告)日：2008-08-26

申请号：US11080487

申请日：2005-03-16

申请人： Tomoyuki Maeda ,  Akira Kikitsu ,  Soichi Oikawa ,  Takeshi Iwasaki

发明人： Tomoyuki Maeda ,  Akira Kikitsu ,  Soichi Oikawa ,  Takeshi Iwasaki

IPC分类号： G11B5/66

CPC分类号： G11B5/667 ,  G11B5/65 ,  G11B5/7325

摘要： A magnetic recording layer is formed on an under-layer comprising a Cu crystalline grain layer and a deposited nitrogen atom layer on the Cu crystalline grain layer surface. Then the magnetic recording layer comprising very small average grain diameter and sharp grain diameter distribution is obtained. The magnetic recording medium comprising the magnetic recording layer shows excellent signal to noise ratio at high density recording.

摘要翻译： 在Cu晶粒层表面上的包含Cu晶粒层和沉积的氮原子层的下层上形成磁记录层。 然后获得包含非常小的平均粒径和尖锐的粒径分布的磁记录层。 包括磁记录层的磁记录介质在高密度记录时显示出优异的信噪比。

公开(公告)号：US07901801B2

公开(公告)日：2011-03-08

申请号：US12166592

申请日：2008-07-02

申请人： Soichi Oikawa ,  Tomoyuki Maeda

发明人： Soichi Oikawa ,  Tomoyuki Maeda

IPC分类号： G11B5/66

CPC分类号： G11B5/732 ,  G11B5/66 ,  G11B5/667 ,  Y10T428/115

摘要： According to one embodiment, a perpendicular magnetic recording medium includes a substrate, and a first magnetic layer and a second magnetic layer formed on the substrate, in which supposing that, for the first and second magnetic layers, respectively, uniaxial magnetic anisotropy constants are Ku1 and Ku2, saturation magnetizations are Ms1 and Ms2, anisotropic magnetic fields are Hk1 and Hk2 and the thicknesses are t1 and t2, then following conditions are satisfied that Ku1 and Ku2 are 3×106 erg/cc or more, Ms1 is smaller than Ms2, Hk1 is larger than Hk2 and t1 is larger than t2.

摘要翻译： 根据一个实施例，垂直磁记录介质包括基板，以及形成在基板上的第一磁性层和第二磁性层，其中，对于第一和第二磁性层，单轴磁各向异性常数分别为Ku1 Ku2，饱和磁化为Ms1和Ms2，各向异性磁场为Hk1和Hk2，厚度为t1和t2，则满足Ku1和Ku2为3×106erg / cc或更高的条件，Ms1小于Ms2， Hk1大于Hk2，t1大于t2。

公开(公告)号：US20050214592A1

公开(公告)日：2005-09-29

申请号：US11085622

申请日：2005-03-22

申请人： Tomoyuki Maeda ,  Akira Kikitsu ,  Soichi Oikawa ,  Takeshi Iwasaki

发明人： Tomoyuki Maeda ,  Akira Kikitsu ,  Soichi Oikawa ,  Takeshi Iwasaki

IPC分类号： G11B5/738 ,  G11B5/64 ,  G11B5/65 ,  G11B5/66 ,  G11B5/667 ,  G11B5/73 ,  G11B5/84 ,  H01F10/16

CPC分类号： G11B5/667 ,  G11B5/65 ,  G11B5/7325

摘要： A grain diameter controlling crystalline layer comprising crystalline grains of a metal selected from the group consisting essentially of Cu, Ni, Rh and Pt was formed on a substrate. Then, deposited atom layer of at least one element selected from the group consisting of oxygen and carbon was formed on the surface of the grain diameter control layer. A magnetic recording layer was deposited on the atoms deposited grain diameter controlling crystalline layer. Then a magnetic recording medium in which the magnetic crystalline grains has small grain diameter and small grain diameter distribution, and the magnetic recording medium shows increased signal to noise ratio at high recording density.

摘要翻译： 在基板上形成包含选自Cu，Ni，Rh和Pt中的金属的晶粒的晶粒直径控制晶体层。 然后，在粒径控制层的表面上形成从由氧和碳组成的组中选出的至少一种元素的沉积原子层。 在原子沉积粒径控制晶体层上沉积磁记录层。 然后是其中磁晶粒具有小的粒径和小的粒径分布的磁记录介质，并且磁记录介质在高记录密度下显示增加的信噪比。

公开(公告)号：US20050214520A1

公开(公告)日：2005-09-29

申请号：US11079190

申请日：2005-03-15

申请人： Soichi Oikawa ,  Takeshi Iwasaki ,  Tomoyuki Maeda ,  Akira Kikitsu

发明人： Soichi Oikawa ,  Takeshi Iwasaki ,  Tomoyuki Maeda ,  Akira Kikitsu

IPC分类号： G11B5/667 ,  B32B5/16 ,  G11B5/64 ,  G11B5/65 ,  G11B5/66 ,  G11B5/73 ,  G11B5/738 ,  G11B5/84 ,  H01F10/00

CPC分类号： B82Y25/00 ,  G11B5/656 ,  G11B5/667 ,  G11B5/7325 ,  H01F10/007 ,  Y10T428/25

摘要： A perpendicular magnetic recording medium suitable for attaining a low noise high magnetic recording density is obtained. The medium has a small average magnetic grain diameter, a small magnetic grain diameter distribution, a high perpendicular crystallographic magnetic grain orientation and a high regularity magnetic grain arrangement. The perpendicular magnetic recording medium comprises a soft magnetic layer, a granular under-layer and a perpendicular magnetic recording layer on a substrate. The granular under-layer is formed on a metal under-layer. The metal grains in the granular layer are separated by nonmagnetic inter-grain material and are partially penetrated into the metal under-layer. The perpendicular magnetic recording layer is formed on the granular layer. Then a perpendicular magnetic recording medium shows high signal to noise ratio and excellent high-density recording characteristics.

摘要翻译： 获得适于获得低噪声高磁记录密度的垂直磁记录介质。 该介质具有小的平均磁晶粒直径，小的磁晶粒直径分布，高垂直晶体磁晶粒取向和高规则磁晶粒排列。 垂直磁记录介质包括在基底上的软磁性层，颗粒底层和垂直磁记录层。 颗粒状底层形成在金属底层上。 颗粒层中的金属颗粒被非磁性颗粒间材料分离，并部分渗入金属底层。 垂直磁记录层形成在粒状层上。 然后垂直磁记录介质显示出高的信噪比和优异的高密度记录特性。

公开(公告)号：US07494725B2

公开(公告)日：2009-02-24

申请号：US11085622

申请日：2005-03-22

申请人： Tomoyuki Maeda ,  Akira Kikitsu ,  Soichi Oikawa ,  Takeshi Iwasaki

发明人： Tomoyuki Maeda ,  Akira Kikitsu ,  Soichi Oikawa ,  Takeshi Iwasaki

IPC分类号： G11B5/66

CPC分类号： G11B5/667 ,  G11B5/65 ,  G11B5/7325

摘要： A grain diameter controlling crystalline layer comprising crystalline grains of a metal selected from the group consisting essentially of Cu, Ni, Rh and Pt was formed on a substrate. Then, deposited atom layer of at least one element selected from the group consisting of oxygen and carbon was formed on the surface of the grain diameter control layer. A magnetic recording layer was deposited on the atoms deposited grain diameter controlling crystalline layer. Then a magnetic recording medium in which the magnetic crystalline grains has small grain diameter and small grain diameter distribution, and the magnetic recording medium shows increased signal to noise ratio at high recording density.

摘要翻译： 在基板上形成包含选自Cu，Ni，Rh和Pt中的金属的晶粒的晶粒直径控制晶体层。 然后，在粒径控制层的表面上形成从由氧和碳组成的组中选出的至少一种元素的沉积原子层。 在原子沉积粒径控制晶体层上沉积磁记录层。 然后是其中磁晶粒具有小的粒径和小的粒径分布的磁记录介质，并且磁记录介质在高记录密度下显示增加的信噪比。

公开(公告)号：US20090011281A1

公开(公告)日：2009-01-08

申请号：US12166592

申请日：2008-07-02

申请人： Soichi Oikawa ,  Tomoyuki Maeda

发明人： Soichi Oikawa ,  Tomoyuki Maeda

IPC分类号： G11B5/33

CPC分类号： G11B5/732 ,  G11B5/66 ,  G11B5/667 ,  Y10T428/115

摘要： According to one embodiment, a perpendicular magnetic recording medium includes a substrate, and a first magnetic layer and a second magnetic layer formed on the substrate, in which supposing that, for the first and second magnetic layers, respectively, uniaxial magnetic anisotropy constants are Ku1 and Ku2, saturation magnetizations are Ms1 and Ms2, anisotropic magnetic fields are Hk1 and Hk2 and the thicknesses are t1 and t2, then following conditions are satisfied that Ku1 and Ku2 are 3×106 erg/cc or more, Ms1 is smaller than Ms2, Hk1 is larger than Hk2 and t1 is larger than t2.

摘要翻译： 根据一个实施例，垂直磁记录介质包括基板，以及形成在基板上的第一磁性层和第二磁性层，其中，对于第一和第二磁性层，单轴磁各向异性常数分别为Ku1 和Ku2，饱和磁化为Ms1和Ms2，各向异性磁场为Hk1和Hk2，厚度为t1和t2，则满足以下条件：Ku1和Ku2为3×106erg / cc或更大，Ms1小于Ms2，Hk1为 大于Hk2和t1大于t2。

公开(公告)号：US20080090002A1

公开(公告)日：2008-04-17

申请号：US11873860

申请日：2007-10-17

申请人： Tomoyuki Maeda ,  Akira Kikitsu ,  Soichi Oikawa ,  Takeshi Iwasaki

发明人： Tomoyuki Maeda ,  Akira Kikitsu ,  Soichi Oikawa ,  Takeshi Iwasaki

IPC分类号： G11B5/84

CPC分类号： G11B5/667 ,  G11B5/65 ,  G11B5/7325

摘要： A magnetic recording layer is formed on an under-layer comprising a Cu crystalline grain layer and a deposited nitrogen atom layer on the Cu crystalline grain layer surface. Then the magnetic recording layer comprising very small average grain diameter and sharp grain diameter distribution is obtained. The magnetic recording medium comprising the magnetic recording layer shows excellent signal to noise ratio at high density recording.

摘要翻译： 在Cu晶粒层表面上的包含Cu晶粒层和沉积的氮原子层的下层上形成磁记录层。 然后获得包含非常小的平均粒径和尖锐的粒径分布的磁记录层。 包括磁记录层的磁记录介质在高密度记录时显示出优异的信噪比。

公开(公告)号：US07666531B2

公开(公告)日：2010-02-23

申请号：US11312429

申请日：2005-12-21

申请人： Takeshi Iwasaki ,  Akira Kikitsu ,  Soichi Oikawa ,  Tomoyuki Maeda

发明人： Takeshi Iwasaki ,  Akira Kikitsu ,  Soichi Oikawa ,  Tomoyuki Maeda

IPC分类号： G11B5/66

CPC分类号： G11B5/667 ,  G11B5/7325

摘要： At least three underlayers, i.e., a first underlayer containing, as a main component, at least one element selected from Ag, Ir, Ni, Pd, Pt, Rh, Hf, Re, Ru, Ti, Ta, Zr, Mg, and Al, a second underlayer containing Mg or Al and Si, and a third underlayer containing, as a main component, at least one element selected from Pt, Pd, Ru, Rh, Co, and Ti, are formed between a substrate and magnetic recording layer.

摘要翻译： 至少有三个底层，即含有选自Ag，Ir，Ni，Pd，Pt，Rh，Hf，Re，Ru，Ti，Ta，Zr，Mg中的至少一种元素作为主要成分的第一底层， Al，含有Mg或Al和Si的第二底层和含有选自Pt，Pd，Ru，Rh，Co和Ti中的至少一种元素作为主要成分的第三底层形成在基板和磁记录 层。

公开(公告)号：US07431999B2

公开(公告)日：2008-10-07

申请号：US11081937

申请日：2005-03-17

申请人： Takeshi Iwasaki ,  Akira Kikitsu ,  Soichi Oikawa ,  Tomoyuki Maeda

发明人： Takeshi Iwasaki ,  Akira Kikitsu ,  Soichi Oikawa ,  Tomoyuki Maeda

IPC分类号： G11B5/66

CPC分类号： G11B5/7325 ,  G11B5/656

摘要： Disclosed is a perpendicular magnetic recording medium including: a nonmagnetic substrate; a first underlayer formed on the nonmagnetic substrate, mainly composed of at least two kinds selected from a group consisting of Fe2O3, Co3O4, MgO, MoO3, Mn3O4, SiO2, Al2O3, TiO2, and ZrO2, and having crystal grains growing in a columnar shape and crystal grain boundaries surrounding the crystal grains; a nonmagnetic second underlayer formed on the first underlayer and having crystal grains with one of a face-centered cubic structure and a hexagonal close-packed structure growing on the crystal grains of the first underlayer; a magnetic layer formed on the second underlayer; and a protective film formed on the magnetic layer.

摘要翻译： 公开了一种垂直磁记录介质，包括：非磁性基板; 形成在非磁性基底上的第一底层，主要由选自Fe 2 O 3 O 3，Co 3 N 3， O 4，MgO，MoO 3，Mn 3 O 4，SiO 2， ，Al 2 O 3，TiO 2和ZrO 2，并且具有生长成柱状的晶粒 和晶粒周围的晶界; 在第一底层上形成非磁性第二底层，并且具有生长在第一底层的晶粒上的面心立方结构和六方密堆积结构之一的晶粒; 形成在所述第二底层上的磁性层; 以及形成在磁性层上的保护膜。