公开(公告)号：US6080476A

公开(公告)日：2000-06-27

申请号：US048167

申请日：1998-03-25

申请人： Tetsuya Kanbe ,  Yoshio Takahashi ,  Akira Ishikawa ,  Ichiro Tamai ,  Yuzuru Hosoe ,  Yoshifumi Matsuda ,  Kiwamu Tanahashi ,  Tomoo Yamamoto

发明人： Tetsuya Kanbe ,  Yoshio Takahashi ,  Akira Ishikawa ,  Ichiro Tamai ,  Yuzuru Hosoe ,  Yoshifumi Matsuda ,  Kiwamu Tanahashi ,  Tomoo Yamamoto

IPC分类号： G11B5/66 ,  G11B5/39 ,  G11B5/64 ,  G11B5/65 ,  H01F10/16

CPC分类号： G11B5/65 ,  G11B5/64 ,  G11B5/653 ,  Y10S428/90 ,  Y10T428/12465 ,  Y10T428/12854 ,  Y10T428/26 ,  Y10T428/265

摘要： It is an object of the present invention to provide a magnetic recording medium which has a magnetic layer deposited on a substrate through a single-layer underlayer or a multilayer-underlayer, the magnetic layer includes magnetic crystal grains having an acicular structure or amorphous magnetic particles, an average grain size of the magnetic grain and a grain-size dispersion normalized by the average grain size are less than 16 nm and less than 0.5, respectively, a value Ku.multidot.v/kT which results from dividing a product of a magnetic anisotropy constant Ku and a volume v of the magnetic grain by a product of a Boltzmann constant k and an absolute temperature T is selected to be greater than 60, and a film thickness of the magnetic layer falls within twice of the average grain size. Thus, there can be realized a magnetic recording system in which a media noise can be reduced, a high S/N and a low bit error rate can be obtained and which has a high recording density of 2 gigabits per one square inches and an MTBF (mean time between failure) of higher than 300000 hours.

摘要翻译： 本发明的目的是提供一种通过单层底层或多层下层沉积在基板上的磁性层的磁记录介质，该磁性层包括具有针状结构的磁性晶粒或非晶磁性颗粒 磁性晶粒的平均晶粒尺寸和平均晶粒尺寸归一化的晶粒尺寸分散度分别小于16nm且小于0.5时，分别由磁各向异性常数Ku的乘积产生的Kuxv / kT值 并且通过玻尔兹曼常数k和绝对温度T的乘积将磁性粒子的体积v选择为大于60，并且磁性层的膜厚度落在平均晶粒尺寸的两倍内。 因此，可以实现可以降低媒体噪声的磁记录系统，可以获得高S / N和低误码率，并且其具有高达2吉比特每平方英寸的高记录密度和MTBF （故障之间的平均时间）高于30万小时。

公开(公告)号：US06605374B2

公开(公告)日：2003-08-12

申请号：US10137398

申请日：2002-05-03

申请人： Tetsuya Kanbe ,  Yoshio Takahashi ,  Akira Ishikawa ,  Ichiro Tamai ,  Yuzuru Hosoe ,  Yoshifumi Matsuda ,  Kiwamu Tanahashi ,  Tomoo Yamamoto

发明人： Tetsuya Kanbe ,  Yoshio Takahashi ,  Akira Ishikawa ,  Ichiro Tamai ,  Yuzuru Hosoe ,  Yoshifumi Matsuda ,  Kiwamu Tanahashi ,  Tomoo Yamamoto

IPC分类号： G11B566

CPC分类号： G11B5/65 ,  G11B5/64 ,  G11B5/653 ,  Y10S428/90 ,  Y10T428/12465 ,  Y10T428/12854 ,  Y10T428/26 ,  Y10T428/265

摘要： The present invention provides a magnetic recording medium having a magnetic layer deposited on a substrate through a single-layer underlayer or a multilayer-underlayer, the magnetic layer includes magnetic crystal grains having an acicular structure or amorphous magnetic particles, an average grain size of the magnetic grain and a grain-size dispersion normalized by the average grain size are less than 16 nm and less than 0.5, respectively, a value Ku·v/kT which results from dividing a product of a magnetic anisotropy constant Ku and a volume v of the magnetic grain by a product of a Boltzmann constant k and an absolute temperature T is selected to be greater than 60, and a film thickness of the magnetic layer falls within twice of the average grain size. Thus, there can be realized a magnetic recording system in which a media noise can be reduced, a high S/N and a low bit error rate can be obtained and which has a high recording density of 2 gigabits per one square inches and an MTBF (mean time between failure) of higher than 300000 hours.

公开(公告)号：US06403242B1

公开(公告)日：2002-06-11

申请号：US09524914

申请日：2000-03-14

申请人： Tetsuya Kanbe ,  Yoshio Takahashi ,  Akira Ishikawa ,  Ichiro Tamai ,  Yuzuru Hosoe ,  Yoshifumi Matsuda ,  Kiwamu Tanahashi ,  Tomoo Yamamoto

发明人： Tetsuya Kanbe ,  Yoshio Takahashi ,  Akira Ishikawa ,  Ichiro Tamai ,  Yuzuru Hosoe ,  Yoshifumi Matsuda ,  Kiwamu Tanahashi ,  Tomoo Yamamoto

IPC分类号： G11B566

CPC分类号： G11B5/65 ,  G11B5/64 ,  G11B5/653 ,  Y10S428/90 ,  Y10T428/12465 ,  Y10T428/12854 ,  Y10T428/26 ,  Y10T428/265

摘要： The present invention provides a magnetic recording medium having a magnetic layer deposited on a substrate through a single-layer underlayer or a multilayer-underlayer, the magnetic layer includes magnetic crystal grains having an acicular structure or amorphous magnetic particles, an average grain size of the magnetic grain and a grain-size dispersion normalized by the average grain size are less than 16 nm and less than 0.5, respectively, a value Ku·v/kT which results from dividing a product of a magnetic anisotropy constant Ku and a volume v of the magnetic grain by a product of a Boltzmann constant k and an absolute temperature T is selected to be greater than 60, and a film thickness of the magnetic layer falls within twice of the average grain size. Thus, there can be realized a magnetic recording system in which a media noise can be reduced, a high S/N and a low bit error rate can be obtained and which has a high recording density of 2 gigabits per one square inches and an MTBF (mean time between failure) of higher than 300000 hours.

公开(公告)号：US06403240B1

公开(公告)日：2002-06-11

申请号：US08849414

申请日：1997-05-19

申请人： Tetsuya Kanbe ,  Akira Ishikawa ,  Ichiro Tamai ,  Yotsuo Yahisa ,  Yuzuru Hosoe ,  Kiwamu Tanahashi ,  Yoshibumi Matsuda ,  Hiroyuki Kataoka ,  Toshinori Ono ,  Shinji Fukaya ,  Kazuhiro Ura ,  Naoto Endo ,  Tomoo Yamamoto

发明人： Tetsuya Kanbe ,  Akira Ishikawa ,  Ichiro Tamai ,  Yotsuo Yahisa ,  Yuzuru Hosoe ,  Kiwamu Tanahashi ,  Yoshibumi Matsuda ,  Hiroyuki Kataoka ,  Toshinori Ono ,  Shinji Fukaya ,  Kazuhiro Ura ,  Naoto Endo ,  Tomoo Yamamoto

IPC分类号： B32B1504

CPC分类号： G11B5/7325 ,  G11B5/012 ,  G11B5/39 ,  G11B5/66 ,  Y10S428/90 ,  Y10T428/12465 ,  Y10T428/12847 ,  Y10T428/12854 ,  Y10T428/26

摘要： A magnetic recording system includes an in-plane magnetic recording medium having a magnetic layer fabricated on a single underlayer or on a plurality of underlayers respectively fabricated on a substrate; a driver unit for driving the in-plane magnetic recording medium in a write direction; a magnetic head having a read unit and a write unit; a unit for moving the magnetic head relative to the in-plane magnetic recording medium; and a read/write signal processing unit for reading an output signal from the magnetic head and writing an input signal to the magnetic recording media, wherein the read unit of the magnetic head is a magnetoresistive head and the single underlayer or at least one of the plurality of underlayers is made of Co-containing amorphous material or fine crystal material, or is made of alloy material, the alloy material having as the main components at least one element selected from a group consisting of Cr, Mo, V and Ta and containing at least one element selected from a group consisting of B, C, P and Bi. The magnetic recording system can be realized which can read and write high density information and have high reliability.

公开(公告)号：US07056604B2

公开(公告)日：2006-06-06

申请号：US10452723

申请日：2003-06-03

申请人： Tetsuya Kanbe ,  Akira Ishikawa ,  Ichiro Tamai ,  Yotsuo Yahisa ,  Yuzuru Hosoe ,  Kiwamu Tanahashi ,  Yoshibumi Matsuda ,  Hiroyuki Kataoka ,  Toshinori Ono ,  Shinji Fukaya ,  Kazuhiro Ura ,  Naoto Endo ,  Tomoo Yamamoto

发明人： Tetsuya Kanbe ,  Akira Ishikawa ,  Ichiro Tamai ,  Yotsuo Yahisa ,  Yuzuru Hosoe ,  Kiwamu Tanahashi ,  Yoshibumi Matsuda ,  Hiroyuki Kataoka ,  Toshinori Ono ,  Shinji Fukaya ,  Kazuhiro Ura ,  Naoto Endo ,  Tomoo Yamamoto

IPC分类号： G11B5/66 ,  G11B5/70

CPC分类号： G11B5/7325 ,  G11B5/012 ,  G11B5/39 ,  G11B5/66 ,  Y10S428/90 ,  Y10T428/12465 ,  Y10T428/12847 ,  Y10T428/12854 ,  Y10T428/26

摘要： A magnetic recording system includes an in-plane magnetic recording medium having a magnetic layer fabricated on a single underlayer or on a plurality of underlayers respectively fabricated on a substrate; a driver unit for driving the in-plane magnetic recording medium in a write direction; a magnetic head having a read unit and a write unit; a unit for moving the magnetic head relative to the in-plane magnetic recording medium; and a read/write signal processing unit for reading an output signal from the magnetic head and writing an input signal to the magnetic recording media, wherein the read unit of the magnetic head is a magnetoresistive head and the single underlayer or at least one of the plurality of underlayers is made of Co-containing amorphous material or fine crystal material, or is made of alloy material, the alloy material having as the main components at least one element selected from a group consisting of Cr, Mo, V and Ta and containing at least one element selected from a group consisting of B, C, P and Bi. The magnetic recording system can be realized which can read and write high density information and have high reliability.

公开(公告)号：US6001447A

公开(公告)日：1999-12-14

申请号：US4318

申请日：1998-01-08

申请人： Kiwamu Tanahashi ,  Yuzuru Hosoe ,  Ichiro Tamai ,  Tetsuya Kanbe ,  Tomoo Yamamoto ,  Masukazu Igarashi ,  Yoshio Takahashi

发明人： Kiwamu Tanahashi ,  Yuzuru Hosoe ,  Ichiro Tamai ,  Tetsuya Kanbe ,  Tomoo Yamamoto ,  Masukazu Igarashi ,  Yoshio Takahashi

IPC分类号： G11B5/66 ,  G11B5/39 ,  G11B5/64 ,  G11B5/65 ,  G11B5/73 ,  G11B5/738 ,  H01F10/16

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

摘要： The magnetic storage apparatus has a high reliability at a recording density of 2 gigabits or more per square inch. The longitudinal recording media necessary to realize the apparatus has a low media noise and is immune from the influence of thermal fluctuations. The magnetic storage apparatus has a longitudinal magnetic recording media including a magnetic layer which is formed on a substrate via a multi-layered underlayer; a driver for driving the recording media in a recording direction; a magnetic head including a recording section and a read-back section; a driver for moving the magnetic head relatively with respect to the longitudinal magnetic recording media; and a read/write signal processor for processing input signals to the magnetic head and output signal read-back therefrom. The read-back section of the magnetic head includes a magnetoresistive head. One layer of the multi-layered underlayer in the longitudinal magnetic recording media which is in contact with the magnetic layer has a substantially hexagonal close-packed (hcp) structure and has crystal grains whose c-axes are substantially parallel with the substrate plane.

摘要翻译： 磁记录装置在每平方英寸2吉比特或更高的记录密度下具有高可靠性。 实现该装置所需的纵向记录介质具有低介质噪声并且免受热波动的影响。 磁存储装置具有纵向磁记录介质，其包括通过多层底层形成在基板上的磁性层; 用于在记录方向上驱动记录介质的驱动器; 包括记录部分和回读部分的磁头; 用于相对于纵向磁记录介质移动磁头的驱动器; 以及用于处理对磁头的输入信号和从其读回的输出信号的读/写信号处理器。 磁头的回读部分包括磁阻头。 与磁性层接触的纵向磁记录介质中的多层底层的一层具有大致六边形密堆积（hcp）结构，并且具有c轴与基板平面基本平行的晶粒。

公开(公告)号：US06596420B2

公开(公告)日：2003-07-22

申请号：US10101946

申请日：2002-03-21

申请人： Tetsuya Kanbe ,  Akira Ishikawa ,  Ichiro Tamai ,  Yotsuo Yahisa ,  Yuzuru Hosoe ,  Kiwamu Tanahashi ,  Yoshibumi Matsuda ,  Hiroyuki Kataoka ,  Toshinori Ono ,  Shinji Fukaya ,  Kazuhiro Ura ,  Naoto Endo ,  Tomoo Yamamoto

发明人： Tetsuya Kanbe ,  Akira Ishikawa ,  Ichiro Tamai ,  Yotsuo Yahisa ,  Yuzuru Hosoe ,  Kiwamu Tanahashi ,  Yoshibumi Matsuda ,  Hiroyuki Kataoka ,  Toshinori Ono ,  Shinji Fukaya ,  Kazuhiro Ura ,  Naoto Endo ,  Tomoo Yamamoto

IPC分类号： G11B566

CPC分类号： G11B5/7325 ,  G11B5/012 ,  G11B5/39 ,  G11B5/66 ,  Y10S428/90 ,  Y10T428/12465 ,  Y10T428/12847 ,  Y10T428/12854 ,  Y10T428/26

摘要： A magnetic recording system includes an in-plane magnetic recording medium having a magnetic layer fabricated on a single underlayer or on a plurality of underlayers respectively fabricated on a substrate; a driver unit for driving the in-plane magnetic recording medium in a write direction; a magnetic head having a read unit and a write unit; a unit for moving the magnetic head relative to the in-plane magnetic recording medium; and a read/write signal processing unit for reading an output signal from the magnetic head and writing an input signal to the magnetic recording media, wherein the read unit of the magnetic head is a magnetoresistive head and the single underlayer or at least one of the plurality of underlayers is made of Co-containing amorphous material or fine crystal material, or is made of alloy material, the alloy material having as the main components at least one element selected from a group consisting of Cr, Mo, V and Ta and containing at least one element selected from a group consisting of B, C, P and Bi. The magnetic recording system can be realized which can read and write high density information and have high reliability.

公开(公告)号：US5922456A

公开(公告)日：1999-07-13

申请号：US922277

申请日：1997-09-03

申请人： Kiwamu Tanahashi ,  Yuzuru Hosoe ,  Ichiro Tamai ,  Tetsuya Kanbe ,  Tomoo Yamamoto

发明人： Kiwamu Tanahashi ,  Yuzuru Hosoe ,  Ichiro Tamai ,  Tetsuya Kanbe ,  Tomoo Yamamoto

IPC分类号： G11B5/66 ,  G11B5/012 ,  G11B5/39 ,  G11B5/64 ,  G11B5/667 ,  G11B5/73 ,  G11B5/738

CPC分类号： B82Y25/00 ,  B82Y10/00 ,  G11B5/012 ,  G11B5/3903 ,  G11B5/3967 ,  G11B5/7325 ,  G11B2005/3996 ,  Y10S428/90 ,  Y10T428/26 ,  Y10T428/265

摘要： A longitudinal magnetic recording medium and a magnetic storage apparatus using the longitudinal magnetic recording medium. The recording medium has a multi-layered underlayer and a magnetic layer formed on it. The underlayer has a first layer of a body-centered cubic structure, a second layer of a hexagonal-close packed structure formed on the first layer, and a third layer of a bcc structure formed on the second layer. The underlayer may further have a fourth layer of an hcp structure layer formed on the third layer.

摘要翻译： 纵向磁记录介质和使用纵向磁记录介质的磁存储装置。 记录介质具有形成在其上的多层底层和磁性层。 底层具有体心立方结构的第一层，形成在第一层上的六方密堆积结构的第二层和形成在第二层上的bcc结构的第三层。 底层可以进一步具有形成在第三层上的第四层hcp结构层。

公开(公告)号：US07050253B2

公开(公告)日：2006-05-23

申请号：US10404071

申请日：2003-04-02

申请人： Tetsuya Kanbe ,  Ichiro Tamai ,  Yuzuru Hosoe ,  Kiwamu Tanahashi ,  Yoshio Takahashi ,  Fumiyoshi Kirino ,  Nagatugu Koiso ,  Satoshi Matsunuma

发明人： Tetsuya Kanbe ,  Ichiro Tamai ,  Yuzuru Hosoe ,  Kiwamu Tanahashi ,  Yoshio Takahashi ,  Fumiyoshi Kirino ,  Nagatugu Koiso ,  Satoshi Matsunuma

IPC分类号： G11B5/02

CPC分类号： G11B5/7325 ,  C23C14/185 ,  G11B5/00 ,  G11B5/012 ,  G11B2005/001 ,  G11B2005/0016 ,  Y10S428/90 ,  Y10S428/928 ,  Y10T428/1107 ,  Y10T428/1121 ,  Y10T428/12507 ,  Y10T428/1266 ,  Y10T428/12667 ,  Y10T428/12674 ,  Y10T428/12819 ,  Y10T428/12826 ,  Y10T428/12868 ,  Y10T428/12944 ,  Y10T428/265

摘要： In a magnetic storage apparatus having a magnetic recording medium, a drive unit for driving this medium in a prespecified recording direction, a magnetic head assembly including a recorder section and reproduction section, means for causing the magnetic head to move relatively with respect to the magnetic record medium, and a record/playback signal processor means for performing signal inputting to the magnetic head and for effecting reproduction of an output signal from the magnetic head, the reproduction section of said magnetic head is composed of a magnetic head of the magnetoresistance effect type, while said magnetic record medium is structured including a substrate and a magnetic layer formed thereover with one or several underlayers being sandwiched therebetween, wherein at least one of the underlayers is a specific layer that is made of amorphous or microcrystalline materials containing therein Ni as the principal or main component thereof and further containing at least one kind of element as selected from the group consisting of Nb and Ta.

公开(公告)号：US06574060B2

公开(公告)日：2003-06-03

申请号：US09799073

申请日：2001-03-06

申请人： Tetsuya Kanbe ,  Ichiro Tamai ,  Yuzuru Hosoe ,  Kiwamu Tanahashi ,  Yoshio Takahashi ,  Fumiyoshi Kirino ,  Nagatugu Koiso ,  Satoshi Matsunuma

发明人： Tetsuya Kanbe ,  Ichiro Tamai ,  Yuzuru Hosoe ,  Kiwamu Tanahashi ,  Yoshio Takahashi ,  Fumiyoshi Kirino ,  Nagatugu Koiso ,  Satoshi Matsunuma

IPC分类号： G11B502

CPC分类号： G11B5/7325 ,  C23C14/185 ,  G11B5/00 ,  G11B5/012 ,  G11B2005/001 ,  G11B2005/0016 ,  Y10S428/90 ,  Y10S428/928 ,  Y10T428/1107 ,  Y10T428/1121 ,  Y10T428/12507 ,  Y10T428/1266 ,  Y10T428/12667 ,  Y10T428/12674 ,  Y10T428/12819 ,  Y10T428/12826 ,  Y10T428/12868 ,  Y10T428/12944 ,  Y10T428/265

摘要： In a magnetic storage apparatus having a magnetic recording medium, a drive unit for driving this medium in a prespecified recording direction, a magnetic head assembly including a recorder section and reproduction section, a way to cause the magnetic head to move relatively with respect to the magnetic record medium, and a record/playback signal processor for performing signal inputting to the magnetic head and for effecting reproduction of an output signal from the magnetic head, the reproduction section of said magnetic head is composed of a magnetic head of the magnetoresistance effect type, while said magnetic record medium is structured including a substrate and a magnetic layer formed thereover with one or several underlayers being sandwiched therebetween, wherein at least one of hte underlayers is a specific layer that is made of amorphous or microcrystalline materials containing therein Ni as the principal or main component thereof and further containing at least one kind of element as selected from the group consisting of Nb and Ta.

摘要翻译： 在具有磁记录介质的磁存储装置中，用于以预先指定的记录方向驱动该介质的驱动单元，包括记录器部分和再现部分的磁头组件，使磁头相对于 磁记录介质和记录/重放信号处理器，用于对磁头进行信号输入并用于实现来自磁头的输出信号的再现，所述磁头的再现部分由磁阻效应型磁头 而所述磁记录介质被构造成包括衬底和形成在其上的一个或多个底层之间的磁性层，其中至少一个底层是由非晶或微晶材料制成的特定层，其中含有Ni作为 其主要成分或主要成分，还含有至少一种e 选自Nb和Ta组成的组。