公开(公告)号：US06534204B1

公开(公告)日：2003-03-18

申请号：US09405725

申请日：1999-09-24

申请人： Hideyuki Akimoto ,  Yuki Yoshida ,  Kenji Sato ,  Iwao Okamoto

发明人： Hideyuki Akimoto ,  Yuki Yoshida ,  Kenji Sato ,  Iwao Okamoto

IPC分类号： G11B566

CPC分类号： G11B5/7325 ,  G11B5/66 ,  Y10S428/90

摘要： There is provided a magnetic storage medium capable of recording information at high recording density and also regenerating the information with a high quality of signal (high S/Nm), and in addition contributing to the elongation of a life span of the recorded information. The magnetic storage medium comprises a non-magnetic substrate, a plurality of magnetic recording layers of ferromagnetism formed on the non-magnetic substrate, and a dividing layer of antiferromagnetism for dividing said plurality of magnetic recording layers from one another through intervening between the magnetic recording layer-to-layer.

摘要翻译： 提供了能够以高记录密度记录信息并且还以高质量信号（高S / Nm）再生信息的磁存储介质，并且还有助于延长记录信息的使用寿命。 磁存储介质包括非磁性衬底，形成在非磁性衬底上的多个磁性磁记录层，以及用于通过介于磁记录之间的方式将所述多个磁记录层彼此分开的反铁磁分隔层 层到层。

公开(公告)号：US06803117B2

公开(公告)日：2004-10-12

申请号：US10166880

申请日：2002-06-11

申请人： Hideyuki Akimoto ,  Kenji Sato ,  Yuki Yoshida ,  Masaya Suzuki ,  Akira Kikuchi ,  Tohru Horie ,  Naoya Saito ,  Akiko Honda

发明人： Hideyuki Akimoto ,  Kenji Sato ,  Yuki Yoshida ,  Masaya Suzuki ,  Akira Kikuchi ,  Tohru Horie ,  Naoya Saito ,  Akiko Honda

IPC分类号： G11B565

CPC分类号： G11B5/7315 ,  G11B5/66 ,  G11B5/7325 ,  G11B5/84 ,  Y10T428/12646 ,  Y10T428/12833 ,  Y10T428/1284 ,  Y10T428/12854 ,  Y10T428/12931 ,  Y10T428/24355 ,  Y10T428/24537 ,  Y10T428/24975 ,  Y10T428/265 ,  Y10T428/31

摘要： A magnetic recording medium for high areal recording density that has excellent thermal fluctuation resistance and recording/reproduction characteristics, and a method of producing the same. The magnetic recording medium includes a glass substrate, an NiP layer having an oxide film on its surface provided on the glass substrate, a ground layer provided on the NiP layer, and a nonmagnetic intermediate layer provided on the ground layer. The magnetic recording medium further includes an exchange layer structure composed of a ferromagnetic layer and a nonmagnetic coupling layer provided on the nonmagnetic intermediate layer, and a magnetic recording layer provided on the exchange layer structure. The oxide film on the NiP layer is formed by introducing a small quantity of oxygen into a vacuum chamber of a sputter device. The formation and oxidation of the NiP layer are conducted at a temperature of not less than 140° C.

摘要翻译： 一种具有优异的耐热波动性和记录/再现特性的高面积记录密度的磁记录介质及其制造方法。 磁记录介质包括玻璃基板，在玻璃基板上的表面上具有氧化膜的NiP层，设置在NiP层上的接地层和设置在接地层上的非磁性中间层。 磁记录介质还包括由铁磁层和设置在非磁性中间层上的非磁性耦合层构成的交换层结构，以及设置在交换层结构上的磁记录层。 通过将少量氧气引入溅射装置的真空室中，形成NiP层上的氧化物膜。 NiP层的形成和氧化在不低于140℃的温度下进行。

公开(公告)号：US6129981A

公开(公告)日：2000-10-10

申请号：US187082

申请日：1998-11-06

申请人： Chiaki Okuyama ,  Kenji Sato ,  Yuki Yoshida ,  Iwao Okamoto

发明人： Chiaki Okuyama ,  Kenji Sato ,  Yuki Yoshida ,  Iwao Okamoto

IPC分类号： G11B5/64 ,  G11B5/65 ,  G11B5/66 ,  G11B5/738

CPC分类号： G11B5/656 ,  G11B5/66 ,  Y10S428/90 ,  Y10T428/26 ,  Y10T428/265

摘要： A magnetic recording medium and a magnetic disk device using the same. The magnetic recording medium comprising a nonmagnetic substrate having applied thereon, through a chromium-based underlayer, at least one magnetic recording layer consisting of cobalt as a principal component, 14 to 23 at % of chromium, 1 to 20 at % of platinum as well as tungsten and carbon. The magnetic recording medium exhibits reduced noise, an improved resolution of the reproducing waveforms and an increased S/N ratio.

摘要翻译： 磁记录介质及使用其的磁盘装置。 该磁记录介质包括其上施加有非磁性基底，通过铬基底层，至少一个由钴作为主要成分组成的磁记录层，14至23at％的铬，1至20at％的铂以及 作为钨和碳。 磁记录介质表现出降低的噪声，改善了再现波形的分辨率和增加的S / N比。

公开(公告)号：US06020060A

公开(公告)日：2000-02-01

申请号：US44639

申请日：1998-03-19

申请人： Yuki Yoshida ,  Chiaki Okuyama ,  Kenji Sato ,  Iwao Okamoto

发明人： Yuki Yoshida ,  Chiaki Okuyama ,  Kenji Sato ,  Iwao Okamoto

IPC分类号： G11B5/012 ,  G11B5/39 ,  G11B5/64 ,  G11B5/65 ,  G11B5/66 ,  G11B5/73 ,  G11B5/738 ,  G11B5/84 ,  G11B5/85 ,  G11B5/851

CPC分类号： B82Y25/00 ,  B82Y10/00 ,  G11B5/012 ,  G11B5/66 ,  G11B5/7325 ,  G11B5/8404 ,  G11B2005/3996 ,  Y10T428/26 ,  Y10T428/265

摘要： A magnetic recording medium characterized by comprising: a nonmagnetic substrate; and, provided on the nonmagnetic substrate in the following order, a first underlayer of a nonmagnetic material composed mainly of chromium, a second underlayer of an antiferromagnetic material, with a body-centered cubic structure, having a Neel temperature of at least 60.degree. C., the second underlayer being such that, when the crystal lattice of the antiferromagnetic material is compared with the crystal lattice in the body-centered cubic structure of the first underlayer, the length of a side of the lattice in the (100) face of the former is approximately equal to the length of a diagonal of the lattice in the (100) face of the latter, permitting the second underlayer to be epitaxially grown onto the first underlayer, and a recording layer of a magnetic material composed mainly of cobalt.

摘要翻译： 一种磁记录介质，其特征在于包括：非磁性基板; 在非磁性基板上按以下顺序设置主要由铬构成的非磁性材料的第一底层，具有体心立方结构的反铁磁材料的第二底层，具有N + E，acu e + EE el的温度为至少60℃，第二底层使得当反铁磁材料的晶格与第一底层的体心立方结构中的晶格相比较时， 前者的（100）面中的晶格近似等于后者的（100）面中的晶格的对角线的长度，允许第二底层外延生长到第一底层上，并且记录层 主要由钴组成的磁性材料。

公开(公告)号：US06740383B2

公开(公告)日：2004-05-25

申请号：US09275578

申请日：1999-03-24

申请人： Masayoshi Shinohara ,  Kenji Sato ,  Yuki Yoshida ,  Iwao Okamoto ,  Yasuji Ikeda ,  Kiyoshi Yamaguchi

发明人： Masayoshi Shinohara ,  Kenji Sato ,  Yuki Yoshida ,  Iwao Okamoto ,  Yasuji Ikeda ,  Kiyoshi Yamaguchi

IPC分类号： G11B573

CPC分类号： B82Y25/00 ,  B82Y10/00 ,  G11B5/012 ,  G11B5/4886 ,  G11B5/656 ,  G11B5/72 ,  G11B5/7325 ,  G11B2005/3996 ,  Y10T428/24355 ,  Y10T428/24975

摘要： A magnetic recording medium and a magnetic disk device using the same. The magnetic recording medium comprising a nonmagnetic substrate having applied thereon, through two or more chromium-based underlayers, a magnetic recording layer having a circumferential direction of easy magnetization and containing cobalt as a principal component thereof, and also containing chromium and platinum in combination with tantalum or tantalum and niobium. Using the magnetic recording medium, a reproducing output and S/N ratio can be increased without causing an increase in noise.

摘要翻译： 磁记录介质及使用其的磁盘装置。 该磁记录介质包括通过两个或多个铬基底层施加在其上的非磁性基底，具有容易磁化的圆周方向并且含有钴作为其主要成分的磁记录层，并且还含有铬和铂与 钽或钽和铌。 使用磁记录介质，可以增加再现输出和S / N比，而不会增加噪声。

公开(公告)号：US5986836A

公开(公告)日：1999-11-16

申请号：US955034

申请日：1997-10-21

申请人： Chiaki Okuyama ,  Kenji Sato ,  Iwao Okamoto

发明人： Chiaki Okuyama ,  Kenji Sato ,  Iwao Okamoto

IPC分类号： G11B5/66 ,  G11B5/00 ,  G11B5/02 ,  G11B5/64 ,  G11B5/65 ,  G11B5/147

CPC分类号： G11B5/656 ,  G11B5/00 ,  G11B5/02 ,  G11B2005/0005

摘要： A magnetic recording method employing a magnetic head and a magnetic recording medium, wherein the size (H.sub.n) of the magnetic field which gives the maximum differential for the direct current remanance curve of the magnetic recording medium and the intensity (H.sub.head) of the recording magnetic field of the magnetic head at the track center position are in the relationship: H.sub.head /2.ltoreq.H.sub.n .ltoreq.H.sub.head, and the maximum value for the magnetic interaction between magnetic particles of the magnetic recording medium (.delta.M) is less than 0.3.

摘要翻译： 使用磁头和磁记录介质的磁记录方法，其中给出磁记录介质的直流余磁曲线的最大差分的磁场的大小（Hn）和记录磁的强度（Hhead） 在磁道中心位置的磁头的磁场为：Hhead / 2

公开(公告)号：US5645898A

公开(公告)日：1997-07-08

申请号：US589217

申请日：1996-01-22

申请人： Kenji Sato ,  Iwao Okamoto ,  Chiaki Okuyama

发明人： Kenji Sato ,  Iwao Okamoto ,  Chiaki Okuyama

IPC分类号： G11B5/72 ,  G11B5/84 ,  H05H1/00

CPC分类号： G11B5/8408 ,  G11B5/72

摘要： The present invention may provide a method for manufacturing a magnetic recording medium with high reliability by rendering simply a surface of a magnetic recording medium rough. A recording film of a magnetic material is formed on a nonmagnetic substrate, then a multilayered or composite protection film including first and second materials is formed on the recording film, and then selectively etching one of said first and second materials to transform a surface of the recording film into a rough surface.

摘要翻译： 本发明可以通过简单地简化磁记录介质的表面来提供用于制造具有高可靠性的磁记录介质的方法。 在非磁性基板上形成磁性材料的记录膜，然后在记录膜上形成包括第一和第二材料的多层或复合保护膜，然后选择性地蚀刻所述第一和第二材料之一， 将胶片录制成粗糙的表面。

公开(公告)号：US06071607A

公开(公告)日：2000-06-06

申请号：US797685

申请日：1997-01-31

申请人： Chiaki Okuyama ,  Kenji Sato ,  Iwao Okamoto ,  Masayoshi Shinohara

发明人： Chiaki Okuyama ,  Kenji Sato ,  Iwao Okamoto ,  Masayoshi Shinohara

IPC分类号： C22C19/07 ,  G11B5/02 ,  G11B5/39 ,  G11B5/64 ,  G11B5/65 ,  G11B5/66 ,  G11B5/73 ,  G11B5/738 ,  G11B5/85 ,  G11B5/851 ,  H01F10/16

CPC分类号： G11B5/7325 ,  G11B5/64 ,  G11B5/656 ,  G11B5/66 ,  Y10S428/90 ,  Y10T428/265

摘要： A magnetic recording medium comprising a nonmagnetic substrate and a magnetic recording film of a magnetic metal material deposited through a primer layer of a nonmagnetic metal material on the substrate, wherein the primer layer is formed of a metallic material composed mainly of chromium or chromium and molybdenum and the magnetic recording film is formed of a metallic material composed mainly of at least one member selected from the group consisting of cobalt, chromium, tantalum, and platinum. The magnetic recording medium enables high-density recording by taking advantage of high coercive force and, at the same time, can reduce the noise level and improve the S/N ratio.

摘要翻译： 一种磁记录介质，包括非磁性基底和磁性金属材料的磁记录膜，所述磁性金属材料通过非磁性金属材料的底涂层沉积在基底上，其中底漆层由主要由铬或铬和钼组成的金属材料形成 并且磁记录膜由主要由选自钴，铬，钽和铂中的至少一种构成的金属材料形成。 磁记录介质可以通过利用高矫顽力实现高密度记录，并且同时可以降低噪声水平并提高S / N比。

公开(公告)号：US06699601B1

公开(公告)日：2004-03-02

申请号：US09525493

申请日：2000-03-15

申请人： Kenji Sato ,  Yuki Yoshida

发明人： Kenji Sato ,  Yuki Yoshida

IPC分类号： G11B566

CPC分类号： G11B5/732 ,  G11B5/7325 ,  Y10S428/90 ,  Y10T428/12465 ,  Y10T428/265

摘要： A magnetic recording medium which has higher S/N and lower manufacturing cost includes a first underlayer including at least one of Co or Cu and P on a non-magnetic substrate, a second underlayer consisting of a non-magnetic material using Cr, and a magnetic layer on the second underlayer.

摘要翻译： 具有较高S / N和较低制造成本的磁记录介质包括在非磁性基板上包括Co或Cu和P中的至少一个的第一底层，由使用Cr的非磁性材料构成的第二底层和 第二底层上的磁性层。

公开(公告)号：US06509108B2

公开(公告)日：2003-01-21

申请号：US09812187

申请日：2001-03-19

申请人： Chiaki Okuyama ,  Yuki Yoshida ,  Kenji Sato ,  Kiyoshi Yamaguchi ,  Yoshita Kitamoto

发明人： Chiaki Okuyama ,  Yuki Yoshida ,  Kenji Sato ,  Kiyoshi Yamaguchi ,  Yoshita Kitamoto

IPC分类号： G11B5738

CPC分类号： G11B5/7315 ,  Y10T428/12833 ,  Y10T428/12847 ,  Y10T428/12854 ,  Y10T428/12944 ,  Y10T428/24355 ,  Y10T428/24479 ,  Y10T428/24537 ,  Y10T428/265 ,  Y10T428/31

摘要： A magnetic recording medium has a nonmagnetic substrate having applied thereon through a nonmagnetic underlayer a magnetic recording layer composed of a magnetic metal material. The nonmagnetic substrate has a smooth surface with an average surface roughness Ra of not more than 20 Å, a recesses-and protrusions-forming layer having stripe-like protrusions and recesses in the circumferential direction, formed on the substrate. A CrP or CrMoP reinforcing coat layer having a hardness higher than that of the recesses-and protrusions-forming layer is sandwiched between the substrate and the recesses-and-protrusions-forming layer.

摘要翻译： 磁记录介质具有通过非磁性底层涂覆有由磁性金属材料构成的磁记录层的非磁性基底。 非磁性基板具有平坦表面粗糙度Ra不大于20μm的平滑表面，在基板上形成有在圆周方向上具有条状突起和凹陷的凹凸形成层。 具有高于凹凸形成层的硬度的CrP或CrMoP增强涂层夹在基板和凹凸形成层之间。