公开(公告)号：US06753101B1

公开(公告)日：2004-06-22

申请号：US09588850

申请日：2000-06-06

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

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

IPC: G11B566

CPC classification number: G11B5/66 ,  G11B5/74 ,  G11B5/82 ,  G11B2005/0002 ,  Y10S428/90 ,  Y10T428/24942 ,  Y10T428/265

Abstract: 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.

Abstract translation: 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：US06740383B2

公开(公告)日：2004-05-25

申请号：US09275578

申请日：1999-03-24

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

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

IPC: G11B573

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

Abstract: 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.

Abstract translation: 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

Applicant: Hideyuki Akimoto ,  Yuki Yoshida ,  Kenji Sato ,  Iwao Okamoto

Inventor： Hideyuki Akimoto ,  Yuki Yoshida ,  Kenji Sato ,  Iwao Okamoto

IPC: G11B566

CPC classification number: G11B5/7325 ,  G11B5/66 ,  Y10S428/90

Abstract: 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.

Abstract translation: 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

Applicant: Haruhiro Komura ,  Yuki Yoshida ,  Hisashi Umeda ,  Iwao Okamoto

Inventor： Haruhiro Komura ,  Yuki Yoshida ,  Hisashi Umeda ,  Iwao Okamoto

IPC: G11B566

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

Abstract: 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.

Abstract translation: 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

Applicant: Yuki Yoshida ,  Iwao Okamoto

Inventor： Yuki Yoshida ,  Iwao Okamoto

IPC: G11B566

CPC classification number: G11B5/66 ,  C23C14/025 ,  Y10S428/90 ,  Y10T428/24942

Abstract: 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.

Abstract translation: 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：US6129981A

公开(公告)日：2000-10-10

申请号：US187082

申请日：1998-11-06

Applicant: Chiaki Okuyama ,  Kenji Sato ,  Yuki Yoshida ,  Iwao Okamoto

Inventor： Chiaki Okuyama ,  Kenji Sato ,  Yuki Yoshida ,  Iwao Okamoto

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

CPC classification number: G11B5/656 ,  G11B5/66 ,  Y10S428/90 ,  Y10T428/26 ,  Y10T428/265

Abstract: 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.

Abstract translation: 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

Applicant: Yuki Yoshida ,  Chiaki Okuyama ,  Kenji Sato ,  Iwao Okamoto

Inventor： Yuki Yoshida ,  Chiaki Okuyama ,  Kenji Sato ,  Iwao Okamoto

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

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

Abstract: 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.

Abstract translation: 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：US20050136291A1

公开(公告)日：2005-06-23

申请号：US10975936

申请日：2004-10-28

Applicant: Iwao Okamoto ,  Hisashi Umeda

Inventor： Iwao Okamoto ,  Hisashi Umeda

IPC: G11B5/64 ,  G11B5/65 ,  G11B5/66 ,  G11B5/738 ,  G11B5/72

CPC classification number: G11B5/66 ,  G11B5/656

Abstract: A magnetic recording medium is provided with first and second ferromagnetic layers which are exchange-coupled via a first nonmagnetic coupling layer and have mutually parallel magnetizations. The second ferromagnetic layer and a magnetic layer are exchange-coupled via a second nonmagnetic coupling layer and have magnetizations which are mutually antiparallel. The first and second ferromagnetic layers and the magnetic layer respectively have dynamic coercivities Hc1′, Hc2′ and Hc3′ which satisfy a relationship Hc1′

Abstract translation: 磁记录介质设置有第一和第二铁磁层，其经由第一非磁性耦合层交换耦合并且具有相互平行的磁化。 第二铁磁层和磁性层通过第二非磁性耦合层进行交换耦合，并具有相互反平行的磁化。 第一和第二铁磁层和磁性层分别具有在记录磁场的切换时间区域中满足关系Hc 1'

公开(公告)号：US06677051B1

公开(公告)日：2004-01-13

申请号：US09648097

申请日：2000-08-25

Applicant: B. Ramamurthy Acharya ,  Iwao Okamoto

Inventor： B. Ramamurthy Acharya ,  Iwao Okamoto

IPC: G11B566

CPC classification number: G11B5/656 ,  G11B5/66 ,  Y10T428/12646 ,  Y10T428/12861 ,  Y10T428/12931 ,  Y10T428/26

Abstract: A magnetic recording medium is constructed to include a substrate, and a magnetic layer disposed above the substrate, wherein the magnetic layer has an initial layer on a side closer to the substrate and a final layer on a side opposite from the substrate with respect to the initial layer. The initial layer is made of a CoCrB-based alloy having a thickness of 1 to 10 nm, and the final layer is made of a Co-based alloy having a thickness of 5 to 30 nm.

Abstract translation: 磁记录介质被构造成包括基板和设置在基板上方的磁性层，其中磁性层在靠近基板的一侧具有初始层，并且相对于基板在与基板相反的一侧具有最终层 初始层。 初始层由厚度为1〜10nm的CoCrB系合金构成，最终层由厚度为5〜30nm的Co系合金构成。

公开(公告)号：US06645646B1

公开(公告)日：2003-11-11

申请号：US09587842

申请日：2000-06-06

Applicant: Hisashi Umeda ,  E. Noel Abarra ,  Iwao Okamoto ,  Yoshifumi Mizoshita

Inventor： Hisashi Umeda ,  E. Noel Abarra ,  Iwao Okamoto ,  Yoshifumi Mizoshita

IPC: G11B566

CPC classification number: G11B5/66 ,  G11B5/74 ,  G11B5/82 ,  G11B2005/0002 ,  Y10S428/90 ,  Y10T428/12465 ,  Y10T428/12861 ,  Y10T428/2495 ,  Y10T428/265

Abstract: A magnetic recording medium is constructed to include at least one exchange layer structure and a magnetic layer provided on the exchange layer structure, where the exchange layer structure includes a ferromagnetic layer and a non-magnetic coupling layer provided on the ferromagnetic layer, and a magnetic bonding layer provided between the ferromagnetic layer and the non-magnetic coupling layer and/or between the non-magnetic coupling layer and the magnetic layer, wherein the magnetic bonding layer has a magnetization direction parallel to the ferromagnetic layer and the magnetic layer.

Abstract translation: 磁记录介质被构造成包括至少一个交换层结构和设置在交换层结构上的磁性层，其中交换层结构包括强磁性层和设置在铁磁层上的非磁性耦合层，以及磁性层 粘结层设置在铁磁层和非磁性耦合层之间和/或非磁性耦合层与磁性层之间，其中磁性结合层具有平行于铁磁性层和磁性层的磁化方向。