公开(公告)号：US07427446B2

公开(公告)日：2008-09-23

申请号：US11049451

申请日：2005-02-02

申请人： Reiko Murao ,  Masaya Suzuki

发明人： Reiko Murao ,  Masaya Suzuki

IPC分类号： G11B5/66

CPC分类号： G11B5/8404 ,  G11B5/66 ,  G11B5/732 ,  G11B5/7325

摘要： A magnetic recording medium including a substrate, a first underlayer provided on the substrate, a first magnetic layer provided on the first underlayer, a nonmagnetic coupling layer provided on the first magnetic layer, and a second magnetic layer provided on the nonmagnetic coupling layer. The first and second magnetic layers are exchange-coupled, and have magnetizations that are mutually antiparallel in a state where no external field is applied to the magnetic recording medium. Additionally, the first underlayer is made of Cr or a Cr alloy each having a bcc crystal structure and including nitrogen, and further wherein the first underlayer has a thickness in a range of 0.5 nm to 6.0 nm.

摘要翻译： 一种磁记录介质，包括基板，设置在基板上的第一底层，设置在第一底层上的第一磁性层，设置在第一磁性层上的非磁性耦合层，以及设置在非磁性耦合层上的第二磁性层。 第一和第二磁性层是交换耦合的，并且在没有外部场施加到磁记录介质的状态下具有相互反平行的磁化。 此外，第一底层由Cr或Cr合金制成，每个Cr或Cr合金都具有bcc晶体结构并包括氮，并且其中第一底层的厚度在0.5nm至6.0nm的范围内。

公开(公告)号：US07141272B2

公开(公告)日：2006-11-28

申请号：US10925718

申请日：2004-08-25

申请人： Reiko Murao ,  Masaya Suzuki

发明人： Reiko Murao ,  Masaya Suzuki

IPC分类号： B05D5/12

CPC分类号： G11B5/732 ,  G11B5/66 ,  G11B5/7325 ,  G11B5/8404

摘要： A method of producing a magnetic recording medium includes forming a underlayer on a base, and successively forming, on the underlayer, a first magnetic layer, a nonmagnetic coupling layer and a second magnetic layer. The first and second magnetic layers are exchange-coupled via the nonmagnetic coupling layer and have antiparallel magnetizations in a state where no external magnetic field is applied on the magnetic recording medium. The underlayer is made of Cr or a Cr alloy having a bcc crystal structure within an atmosphere including nitrogen gas.

摘要翻译： 制造磁记录介质的方法包括在基底上形成底层，并且在底层上依次形成第一磁性层，非磁性耦合层和第二磁性层。 第一和第二磁性层通过非磁性耦合层进行交换耦合，并且在没有外部磁场施加在磁记录介质上的状态下具有反平行磁化。 底层由包含氮气的气氛中的具有bcc晶体结构的Cr或Cr合金制成。

公开(公告)号：US20050170103A1

公开(公告)日：2005-08-04

申请号：US10925718

申请日：2004-08-25

申请人： Reiko Murao ,  Masaya Suzuki

发明人： Reiko Murao ,  Masaya Suzuki

IPC分类号： B05D5/12 ,  G11B5/66 ,  G11B5/73 ,  G11B5/84

CPC分类号： G11B5/732 ,  G11B5/66 ,  G11B5/7325 ,  G11B5/8404

摘要： A method of producing a magnetic recording medium includes forming a underlayer on a base, and successively forming, on the underlayer, a first magnetic layer, a nonmagnetic coupling layer and a second magnetic layer. The first and second magnetic layers are exchange-coupled via the nonmagnetic coupling layer and have antiparallel magnetizations in a state where no external magnetic field is applied on the magnetic recording medium. The underlayer is made of Cr or a Cr alloy having a bcc crystal structure within an atmosphere including nitrogen gas.

摘要翻译： 制造磁记录介质的方法包括在基底上形成底层，并且在底层上依次形成第一磁性层，非磁性耦合层和第二磁性层。 第一和第二磁性层通过非磁性耦合层进行交换耦合，并且在没有外部磁场施加在磁记录介质上的状态下具有反平行磁化。 底层由包含氮气的气氛中的具有bcc晶体结构的Cr或Cr合金制成。

公开(公告)号：US20050191524A1

公开(公告)日：2005-09-01

申请号：US11049451

申请日：2005-02-02

申请人： Reiko Murao ,  Masaya Suzuki

发明人： Reiko Murao ,  Masaya Suzuki

IPC分类号： B32B1/00 ,  G11B5/66 ,  G11B5/73 ,  G11B5/84

CPC分类号： G11B5/8404 ,  G11B5/66 ,  G11B5/732 ,  G11B5/7325

摘要： A method of producing a magnetic recording medium includes forming a underlayer on a base, and successively forming, on the underlayer, a first magnetic layer, a nonmagnetic coupling layer and a second magnetic layer. The first and second magnetic layers are exchange-coupled via the nonmagnetic coupling layer and have antiparallel magnetizations in a state where no external magnetic field is applied on the magnetic recording medium. The underlayer is made of Cr or a Cr alloy having a bcc crystal structure within an atmosphere including nitrogen gas.

摘要翻译： 制造磁记录介质的方法包括在基底上形成底层，并且在底层上依次形成第一磁性层，非磁性耦合层和第二磁性层。 第一和第二磁性层通过非磁性耦合层进行交换耦合，并且在没有外部磁场施加在磁记录介质上的状态下具有反平行磁化。 底层由包含氮气的气氛中的具有bcc晶体结构的Cr或Cr合金制成。

公开(公告)号：US06830807B2

公开(公告)日：2004-12-14

申请号：US10186207

申请日：2002-06-27

申请人： Chiaki Okuyama ,  Atsushi Endo ,  Akira Kikuchi ,  Takashi Gouke ,  Reiko Murao

发明人： Chiaki Okuyama ,  Atsushi Endo ,  Akira Kikuchi ,  Takashi Gouke ,  Reiko Murao

IPC分类号： G11B562

CPC分类号： G11B5/7325 ,  G11B5/656 ,  Y10T428/265

摘要： A magnetic recording medium which is thermally stable and produces low media noise. By providing a plurality of intermediate layers made of a CoCr alloy of which saturation magnetic flux densities are controlled within a predetermined range, the magnetic recording medium simultaneously realizes both a high S/Nm and thermal stability.

摘要翻译： 一种热稳定并产生低介质噪声的磁记录介质。 通过提供由饱和磁通密度控制在预定范围内的CoCr合金制成的多个中间层，磁记录介质同时实现高S / Nm和热稳定性。

公开(公告)号：US06753102B2

公开(公告)日：2004-06-22

申请号：US10107724

申请日：2002-03-27

申请人： Reiko Murao ,  Chiaki Okuyama ,  Akira Kikuchi

发明人： Reiko Murao ,  Chiaki Okuyama ,  Akira Kikuchi

IPC分类号： G11B566

CPC分类号： G11B5/7325 ,  G11B5/66

摘要： An object of this invention is to provide a magnetic recording medium in which its S/Nm (output/medium noise ratio) is improved. This magnetic recording medium is comprised of a first foundation layer made of alloy material composed of mainly Cr with added B, a second foundation layer made of alloy material in which Mo is mixed in Cr, an intermediate layer made of alloy material composed of mainly Co with added Cr and Ta, a lower magnetic layer and an upper magnetic layer made of alloy material composed of mainly Co with added Cr, Pt, B and a protective film composed of mainly C, these layers being formed in this order from the bottom.

摘要翻译： 本发明的目的是提供一种其S / Nm（输出/中等噪声比）提高的磁记录介质。 该磁记录介质包括由主要由Cr组成的合金材料制成的第一基础层B，由Cr中的Mo混合的合金材料制成的第二基础层，由主要由Co组成的合金材料制成的中间层 添加Cr和Ta，下层磁性层和由主要由Co组成的合金材料制成的上部磁性层，添加Cr，Pt，B和主要由C组成的保护膜，这些层从底部开始依次形成。

公开(公告)号：US20070275269A1

公开(公告)日：2007-11-29

申请号：US11583283

申请日：2006-10-19

申请人： Hideaki Takahoshi ,  Atsushi Endo ,  Reiko Murao ,  Shinya Sato ,  Akira Kikuchi

发明人： Hideaki Takahoshi ,  Atsushi Endo ,  Reiko Murao ,  Shinya Sato ,  Akira Kikuchi

IPC分类号： G11B5/66

CPC分类号： G11B5/7325 ,  G11B5/66 ,  G11B5/7379

摘要： A magnetic recording medium is disclosed that includes a substrate; and an underlayer, a first magnetic layer, a non-magnetic coupling layer, a second magnetic layer, a third magnetic layer, a non-magnetic separation layer, and a fourth magnetic layer stacked in this order on the substrate. The first magnetic layer and the second magnetic layer are antiferromagnetically exchange-coupled, and the second magnetic layer and the third magnetic layer are ferromagnetically exchange-coupled. The third magnetic layer has an anisotropic magnetic field smaller than the anisotropic magnetic field of the second magnetic layer, and has a saturation magnetization greater than the saturation magnetization of the second magnetic layer.

摘要翻译： 公开了一种包括基板的磁记录介质; 以及在基板上依次层叠的底层，第一磁性层，非磁性耦合层，第二磁性层，第三磁性层，非磁性分离层和第四磁性层。 第一磁性层和第二磁性层是反铁磁交换耦合的，第二磁性层和第三磁性层是铁磁交换耦合的。 第三磁性层具有比第二磁性层的各向异性磁场小的各向异性磁场，并且具有大于第二磁性层的饱和磁化强度的饱和磁化强度。

公开(公告)号：US06682834B2

公开(公告)日：2004-01-27

申请号：US09805415

申请日：2001-03-13

申请人： Chiaki Okuyama ,  Reiko Murao ,  Atsushi Endo ,  Akira Kikuchi

发明人： Chiaki Okuyama ,  Reiko Murao ,  Atsushi Endo ,  Akira Kikuchi

IPC分类号： G11B368

CPC分类号： G11B5/656 ,  G11B5/66

摘要： A magnetic storage medium includes a magnetic layer of a Co alloy of a system Co—Cr—Pt—B—Cu, wherein the magnetic layer has a thickness t and a remnant magnetic flux density Br satisfying a relationship (t×Br) 2.0 nT·m≦(t×Br)≦7.0 nT·m, wherein the Co alloy contains, in addition to Co, Cr with a concentration &bgr; of 20-26 at % (20 at %≦&bgr;≦26 at %), Pt with a concentration &ggr; of 6-20 at % (6 at %≦&ggr;≦20 at %), B with a concentration &dgr; of 1-7 at % (1 at %≦&dgr;≦7 at %), and Cu with a concentration &egr; of 2-7 at % (2 at %≦&egr;≦7 at %).

摘要翻译： 磁存储介质包括Co-Cr-Pt-B-Cu体系的Co合金的磁性层，其中磁性层具有厚度t和满足关系式（txBr）2.0nT.m的剩余磁通密度Br。 <=（TXBr）<= 7.0nT.m，其中除了Co之外，Co合金还含有浓度为20-26at％（20at％<=β<= 26at％）的Cr， 浓度δ为6-20at％（6at％<=γ<= 20at％），B浓度为1-7at％（1at％≤Δ7at％）和Cu 浓度ε为2-7at％（2at％<=ε= 7 AT％）。

公开(公告)号：US20060024532A1

公开(公告)日：2006-02-02

申请号：US10993071

申请日：2004-11-19

申请人： Reiko Murao ,  Kenji Sato

发明人： Reiko Murao ,  Kenji Sato

IPC分类号： B05D5/12 ,  G11B5/66

CPC分类号： G11B5/8404 ,  G11B5/66 ,  G11B5/7325 ,  G11B5/7379 ,  G11B5/851

摘要： A method of producing a magnetic recording medium having a recording layer that is magnetized in a recording direction to record information in the recording layer, includes forming a seed layer made of an amorphous CoW or an amorphous CoW alloy material on a substrate surface, forming an underlayer on the seed layer, and forming the recording layer on the underlayer. The forming of the seed layer includes arranging a target to confront the substrate surface, sputtering with respect to the substrate surface sputtering particles of the target from one of two sides partitioned by a first plane that is formed by the recording direction and a substrate normal which is normal to the substrate surface in a predetermined direction inclined with respect to the substrate normal, and oxidizing a surface of the seed layer on which the underlayer is formed.

摘要翻译： 一种制造具有在记录方向被磁化以在记录层中记录信息的记录层的磁记录介质的方法，包括在基板表面上形成由非晶CoW或无定形CoW合金材料制成的晶种层，形成 底层，并在底层上形成记录层。 种子层的形成包括设置目标以面对基板表面，相对于由记录方向形成的第一平面划分的两侧之一的靶基板表面溅射颗粒和基板法线 在相对于衬底法线倾斜的预定方向上与衬底表面垂直，并且氧化形成有底层的种子层的表面。

公开(公告)号：US20050042480A1

公开(公告)日：2005-02-24

申请号：US10953093

申请日：2004-09-29

申请人： Reiko Murao ,  Takashi Gouke ,  Isatake Kaitsu ,  Akira Kikuchi

发明人： Reiko Murao ,  Takashi Gouke ,  Isatake Kaitsu ,  Akira Kikuchi

IPC分类号： G11B5/64 ,  G11B5/65 ,  G11B5/66 ,  G11B5/73 ,  G11B5/738 ,  G11B5/84 ,  G11B5/851

CPC分类号： G11B5/66 ,  G11B5/656 ,  G11B5/7325 ,  G11B5/7379 ,  G11B5/8404 ,  G11B5/851

摘要： A magnetic recording medium including a ferromagnetic layer made of a Co-based alloy material, a nonmagnetic coupling layer formed on the ferromagnetic layer and made of Ru or a Ru-based alloy material, and a magnetic recording layer formed on the nonmagnetic coupling layer and made of a Co-based alloy material. The nonmagnetic coupling layer is formed by sputtering in an atmosphere of Ar—N2 mixed gas, so that the nonmagnetic coupling layer contains nitrogen. The partial pressure of nitrogen during the sputtering is set in the range of 6.7×10−3 to 3.7×10−2 Pa.

摘要翻译： 一种磁记录介质，包括由Co基合金材料制成的铁磁层，形成在铁磁层上的由Ru或Ru基合金材料制成的非磁性耦合层和形成在非磁性耦合层上的磁记录层和 由Co基合金材料制成。 非磁耦合层通过溅射在Ar-N 2混合气体的气氛中形成，使得非磁性耦合层含有氮。 溅射期间氮的分压设定在6.7×10 -3至3.7×10 -2 Pa的范围内。