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：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。

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：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：US06689496B1

公开(公告)日：2004-02-10

申请号：US09716386

申请日：2000-11-20

申请人： Haruhiro Komura ,  Yuki Yoshida ,  Hisashi Umeda ,  Iwao Okamoto

发明人： Haruhiro Komura ,  Yuki Yoshida ,  Hisashi Umeda ,  Iwao Okamoto

IPC分类号： G11B566

CPC分类号： G11B5/732 ,  G11B5/656 ,  G11B5/7325 ,  G11B5/84 ,  Y10S428/90 ,  Y10T428/12465 ,  Y10T428/12854 ,  Y10T428/12931 ,  Y10T428/24942 ,  Y10T428/265

摘要： A magnetic recording medium includes a substrate, a nonmagnetic seed layer provided on the substrate, and a magnetic layer provided on the nonmagnetic seed layer via one or a plurality of layers. The nonmagnetic seed layer is made of NiAl having an oxygen concentration of approximately 1500 to 4000 ppm.

摘要翻译： 磁记录介质包括基板，设置在基板上的非磁性种子层，以及经由一个或多个层设置在非磁性种子层上的磁性层。 非磁性种子层由氧浓度为约1500〜4000ppm的NiAl制成。

公开(公告)号：US06506508B1

公开(公告)日：2003-01-14

申请号：US09666573

申请日：2000-09-21

申请人： Yuki Yoshida ,  Iwao Okamoto

发明人： Yuki Yoshida ,  Iwao Okamoto

IPC分类号： G11B566

CPC分类号： G11B5/66 ,  C23C14/025 ,  Y10S428/90 ,  Y10T428/24942

摘要： In a magnetic recording medium including an underlayer made of an anti-ferromagnetic material and a magnetic recording layer made of a material containing cobalt as the principal component that are serially disposed on a non-magnetic substrate, an intermediate layer made of a ferromagnetic material is sandwiched between the underlayer and the magnetic recording layer. A magnetic recording medium capable of providing an improved S/N ratio and high-density recording is provided. A production method for such a magnetic recording medium and a magnetic storage apparatus using the same are also provided.

摘要翻译： 在包括由反铁磁材料制成的底层和由以钴为主要成分的材料制成的磁记录层的磁记录介质中，串联地设置在非磁性基板上，由铁磁材料制成的中间层是 夹在底层和磁记录层之间。 提供能够提供改善的S / N比和高密度记录的磁记录介质。 还提供了这种磁记录介质的制造方法和使用该磁记录介质的磁存储装置。

公开(公告)号：US06753101B1

公开(公告)日：2004-06-22

申请号：US09588850

申请日：2000-06-06

申请人： E. Noel Abarra ,  Iwao Okamoto ,  Yoshifumi Mizoshita ,  Yuki Yoshida

发明人： E. Noel Abarra ,  Iwao Okamoto ,  Yoshifumi Mizoshita ,  Yuki Yoshida

IPC分类号： G11B566

CPC分类号： G11B5/66 ,  G11B5/74 ,  G11B5/82 ,  G11B2005/0002 ,  Y10S428/90 ,  Y10T428/24942 ,  Y10T428/265

摘要： A magnetic recording medium is provided with at least one exchange layer structure, and a magnetic layer formed on the exchange layer structure. The exchange layer structure includes a ferromagnetic layer and a non-magnetic coupling layer provided on the ferromagnetic layer and under the magnetic layer.

摘要翻译： 磁记录介质具有至少一个交换层结构和形成在交换层结构上的磁性层。 交换层结构包括铁磁层和设置在铁磁层上和磁层下面的非磁性耦合层。

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：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。