公开(公告)号：US20060088736A1

公开(公告)日：2006-04-27

申请号：US11257978

申请日：2005-10-24

申请人： Takayuki Ichihara ,  Hiroyuki Nakagawa ,  Ikuko Takekuma ,  Ichiro Tamai

发明人： Takayuki Ichihara ,  Hiroyuki Nakagawa ,  Ikuko Takekuma ,  Ichiro Tamai

IPC分类号： G11B5/65 ,  C23C14/00

CPC分类号： C23C14/34 ,  G11B5/656 ,  G11B5/667 ,  G11B5/851

摘要： In a granular magnetic recording layer of a perpendicular magnetic recording medium, media noises are reduced by separating adequately magnetic crystal grains and non-magnetic grain boundary and decreasing magnetic exchange interactions among the magnetic crystal grains without causing damage to magnetic anisotropy of the magnetic crystal grains. In one embodiment, the perpendicular magnetic recording medium, in which crystal alloy grains containing Co, Pt, and Cr, and non-magnetic grain boundary containing Si and O is included; the ratio of the number of O atom to that of Si atom in the magnetic recording layer is between about 2.5 and 5; the Si atomic composition in the magnetic recording layer is between about 3 and 6 atomic %; and the O atomic composition in the magnetic recording layer is between about 12 and 20 atomic %, is used. The in-plane distribution of perpendicular coercivity at any points of the medium of the magnetic recording layer is made at most about ±10% of an average value.

公开(公告)号：US20050227121A1

公开(公告)日：2005-10-13

申请号：US11148164

申请日：2005-06-09

申请人： Yoshiyuki Hirayama ,  Hiroyuki Nakagawa ,  Hiroaki Nemoto ,  Ichiro Tamai ,  Ikuko Takekuma

发明人： Yoshiyuki Hirayama ,  Hiroyuki Nakagawa ,  Hiroaki Nemoto ,  Ichiro Tamai ,  Ikuko Takekuma

IPC分类号： G11B5/65 ,  B32B3/00 ,  G11B5/147 ,  G11B5/64 ,  G11B5/66 ,  G11B5/667 ,  G11B5/70 ,  G11B5/73 ,  G11B5/851

CPC分类号： B82Y10/00 ,  G11B5/656 ,  G11B5/66 ,  G11B5/7325 ,  G11B5/743 ,  Y10T428/24802

摘要： A perpendicular magnetic recording medium includes an intermediate film formed of a plurality of layers between a soft magnetic film and a perpendicular magnetization film. The intermediate film includes at least two layers, i.e., an oxygen-containing layer, or a nonmetallic element-containing layer containing nitrogen, silicon or carbon, and a metallic layer formed on a surface side of the oxygen-containing layer or the nonmetallic element-containing layer. The metallic layer includes a plurality of isolated island-shaped structures. Crystal grains of the perpendicular magnetization film are formed so as to correspond to the isolated island-shaped structures. As a result, a high recording density is obtained.

摘要翻译： 垂直磁记录介质包括由软磁膜和垂直磁化膜之间的多层形成的中间膜。 中间膜包括至少两层，即含氧层或含有氮，硅或碳的非金属元素层，以及在含氧层或非金属元素的表面侧上形成的金属层 包含层。 金属层包括多个孤立的岛状结构。 垂直磁化膜的晶粒形成为对应于孤立的岛状结构。 结果，获得高记录密度。

公开(公告)号：US20050227120A1

公开(公告)日：2005-10-13

申请号：US11105045

申请日：2005-04-12

申请人： Takayuki Ichihara ,  Atsushi Nakamura ,  Ichiro Tamai ,  Yuzuru Hosoe

发明人： Takayuki Ichihara ,  Atsushi Nakamura ,  Ichiro Tamai ,  Yuzuru Hosoe

IPC分类号： G11B5/64 ,  G11B5/65 ,  G11B5/66 ,  G11B5/667 ,  G11B5/73 ,  G11B5/738 ,  H01F10/16 ,  H01F10/30

CPC分类号： G11B5/667 ,  G11B5/66 ,  G11B5/7325

摘要： Embodiments of the invention provide a perpendicular magnetic recording medium capable of reconciling a high recording density with high thermal stability, and having a high write-ability while maintaining high magnetic anisotropy energy. In one embodiment, a perpendicular magnetic recording medium has a soft-magnetic underlayer, and magnetic recording layers, and the magnetic recording layers comprises a first recording layer containing magnetic grains oriented in a direction normal to a medium plane, and a second recording layer containing magnetic grains tilted in a cross-track direction. There can be provided a perpendicular magnetic recording medium resistant to thermal fluctuation, small in medium noise, and excellent in write-ability.

摘要翻译： 本发明的实施方案提供了一种垂直磁记录介质，其能够调和高记录密度和高热稳定性，并且具有高的写入能力，同时保持高的磁各向异性能量。 在一个实施例中，垂直磁记录介质具有软磁性底层和磁记录层，并且磁记录层包括含有沿垂直于介质平面的方向取向的磁性颗粒的第一记录层和含有 磁性晶粒沿横向方向倾斜。 可以提供耐热波动，中等噪声小，写入性优异的垂直磁记录介质。

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：US06221508B1

公开(公告)日：2001-04-24

申请号：US09206869

申请日：1998-12-08

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： C23C1500

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 magneto-resistance 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.

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，用于使磁头相对于磁体相对移动的装置 记录介质和记录/重放信号处理器装置，用于对磁头执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的磁头组成 所述磁记录介质被构造成包括基板和形成在其上的一个或多个底层之间形成的磁性层，其中至少一个底层是由其中含有Ni的非晶或微晶材料制成的特定层 作为其主要成分或主要成分，还含有至少一种 选自Nb和Ta的元素。

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。