公开(公告)号：US5572379A

公开(公告)日：1996-11-05

申请号：US305193

申请日：1994-09-13

申请人： Hajime Aoi ,  Toshiaki Tsuyoshi ,  Makoto Koizumi ,  Nobumasa Nishiyama ,  Yoshibumi Matsuda ,  Takuji Ogawa ,  Kazuhisa Shiraishi

发明人： Hajime Aoi ,  Toshiaki Tsuyoshi ,  Makoto Koizumi ,  Nobumasa Nishiyama ,  Yoshibumi Matsuda ,  Takuji Ogawa ,  Kazuhisa Shiraishi

IPC分类号： G11B5/02 ,  G11B5/00 ,  G11B5/012 ,  G11B5/09 ,  G11B5/39 ,  G11B5/40 ,  G11B5/55 ,  G11B5/596 ,  G11B19/02 ,  G11B19/04 ,  G11B27/30 ,  G11B27/36 ,  G11B5/03 ,  G11B5/127 ,  G11B5/33

CPC分类号： G11B19/04 ,  G11B19/02 ,  G11B27/3027 ,  G11B27/36 ,  G11B5/00 ,  G11B5/012 ,  G11B5/40 ,  G11B5/5547 ,  G11B2005/0016 ,  G11B2005/0018 ,  G11B5/59683

摘要： In a magnetic recording drive having a plurality of magnetic heads each employing a magnetoresistive sensor for the purpose of averaging the time required for sense currents to be caused to flow through the respective magnetoresistive sensors to shorten the longest reproducing time and to suppress the degradation of the characteristics due to the electromigration, thereby improving the reliability of the magnetic recording drive, the magnetic recording drive includes circuits for averaging the useful life depending on the currents caused to flow through the respective magnetoresistive sensors among the plurality of magnetic heads, whereby the time required for the sense current to be caused to flow through one MR reproducing head is greatly shortened. Therefore, the levels of outputs of the MR reproducing heads can be increased without reduction of the reliability and thus the reliability of the magnetic recording drive can be improved.

摘要翻译： 在具有多个磁头的磁记录驱动器中，每个磁头采用磁阻传感器，用于平均要使感应电流流过各磁阻传感器所需的时间，以缩短最长再现时间并抑制 由于电迁移的特性，从而提高了磁记录驱动器的可靠性，磁记录驱动器包括用于根据流过多个磁头中的相应磁阻传感器的电流来平均使用寿命的电路，由此所需的时间 使得通过一个MR再现头流动的感测电流大大缩短。 因此，可以在不降低可靠性的情况下增加MR再现头的输出电平，从而可以提高磁记录驱动器的可靠性。

公开(公告)号：US20060109000A1

公开(公告)日：2006-05-25

申请号：US11286130

申请日：2005-11-22

申请人： Kiyoshi Makino ,  Yoshibumi Matsuda

发明人： Kiyoshi Makino ,  Yoshibumi Matsuda

IPC分类号： G01R33/12

CPC分类号： G11B27/36 ,  G01R33/1207 ,  G11B5/4555 ,  G11B19/04 ,  G11B2005/001 ,  G11B2005/0029

摘要： Because of its characteristics, a perpendicular magnetic recording medium has the inconvenience that since sections with low signal stability due to magnetic defects are not easily detectible in advance, these sections are detected after mounting of the medium in a magnetic disk device or after product shipping. According to one embodiment, in the manufacturing processes for the perpendicular magnetic recording medium, a DC-erase process step for direct-current demagnetizing the medium is performed after a magnetic film deposition process step and a lubricating-agent application process step. This maximizes the effects of a demagnetizing field and intentionally increases directional instability of magnetization. After the above processes, the medium is further provided with a heating process to accelerate the reversal of magnetization in latent defective sections. A defect examination step for detecting the magnetization reversal sections on the basis of changes in the baseline of the signal read out from the medium under the above state is performed, whereby defects can be detected efficiently.

摘要翻译： 由于其特征，垂直磁记录介质具有不便之处，即由于磁缺陷引起的信号稳定性低的部分预先不易检测，所以在将介质安装在磁盘装置中或在产品运输之后检测这些部分。 根据一个实施例，在垂直磁记录介质的制造过程中，在磁性薄膜沉积工艺步骤和润滑剂涂布工艺步骤之后进行直流去磁介质的直流 - 擦除处理步骤。 这使得去磁场的作用最大化，故意增加磁化的方向不稳定性。 在上述处理之后，介质还具有加热处理，以加速潜在缺陷部分中的磁化反转。 执行基于在上述状态下从介质读出的信号的基线的变化来检测磁化反转部的缺陷检查步骤，由此能够有效地检测缺陷。

公开(公告)号：US07005202B2

公开(公告)日：2006-02-28

申请号：US10631768

申请日：2003-08-01

申请人： Tetsuya Kanbe ,  Yotsuo Yahisa ,  Yoshibumi Matsuda ,  Jo Inagaki ,  Koji Sakamoto

发明人： Tetsuya Kanbe ,  Yotsuo Yahisa ,  Yoshibumi Matsuda ,  Jo Inagaki ,  Koji Sakamoto

IPC分类号： G11B5/66 ,  G11B5/70

CPC分类号： G11B5/7325 ,  G11B5/00 ,  G11B5/656 ,  Y10S428/90 ,  Y10T428/12465 ,  Y10T428/12854 ,  Y10T428/12944

摘要： The longitudinal magnetic recording medium includes a non-magnetic substrate, a first underlayer having at least one of an amorphous structure and a fine crystal structure formed on the non-magnetic substrate, a second underlayer having a body-centered cubic structure formed on the first underlayer, a third underlayer having a hexagonal closed packed structure formed on the second underlayer, and a magnetic layer having the hexagonal closed packed structure formed on the third underlayer, wherein the third underlayer is composed of an alloy containing Co and Ru.

公开(公告)号：US06846577B2

公开(公告)日：2005-01-25

申请号：US10386456

申请日：2003-03-13

申请人： Kazusuke Yamanaka ,  Tomoo Yamamoto ,  Yuzuru Hosoe ,  Nobuyuki Inaba ,  Yasutaro Uesaka ,  Masaaki Futamoto ,  Yoshibumi Matsuda ,  Kenji Furusawa ,  Shinji Narishige

发明人： Kazusuke Yamanaka ,  Tomoo Yamamoto ,  Yuzuru Hosoe ,  Nobuyuki Inaba ,  Yasutaro Uesaka ,  Masaaki Futamoto ,  Yoshibumi Matsuda ,  Kenji Furusawa ,  Shinji Narishige

IPC分类号： G11B5/66 ,  G11B5/02 ,  G11B5/64 ,  G11B5/65 ,  G11B5/73

CPC分类号： G11B5/64 ,  Y10T428/12465 ,  Y10T428/12986 ,  Y10T428/265 ,  Y10T428/31

摘要： An ferromagnetic thin film is used to provide a magnetic recording medium whose noise is low and whose S/N value is high. The ferromagnetic thin film as the magnetic film of the magnetic recording medium is such that the fluctuation field of magnetic viscosity at 25° C. at the field strength equal to remanence coercivity or coercivity is not less than 15 oersteds and the coercivity is not less than 2000 oersteds.

摘要翻译： 铁磁性薄膜用于提供噪声低且S / N值高的磁记录介质。 作为磁记录介质的磁性膜的铁磁性薄膜使得在等于剩磁矫顽力或矫顽力的场强下，25℃下磁力粘度的波动范围不小于15奥斯特，矫顽力不小于 2000奥斯特。

公开(公告)号：US06692843B2

公开(公告)日：2004-02-17

申请号：US09784078

申请日：2001-02-16

申请人： Yoshibumi Matsuda ,  Akira Ishikawa ,  Yotsuo Yahisa ,  Yuzuru Hosoe ,  Tetsuya Kanbe ,  Koji Sakamoto

发明人： Yoshibumi Matsuda ,  Akira Ishikawa ,  Yotsuo Yahisa ,  Yuzuru Hosoe ,  Tetsuya Kanbe ,  Koji Sakamoto

IPC分类号： G11B573

CPC分类号： G11B5/7325 ,  G11B5/8404 ,  Y10T428/1266 ,  Y10T428/12667

摘要： A magnetic recording medium having first undercoating layers 40, 40′ formed directly or via substrate face undercoating layers on a substrate 40, second undercoating layers 42, 42′ directly formed on the first undercoating layers 40, 40′, magnetic films 43, 43′ formed on the second undercoating layers 42, 42′, and protective films 44, 44′ formed on the magnetic films 43, 43′. Clusters having a large amount of oxygen are dispersed on the boundary face of the first and second undercoating layers. Preferably, the first undercoating layer is made of an alloy which includes two kinds of elements in which the difference between oxide formation standard free energies &Dgr;G° of the elements at the temperature of 250° C. is large.

摘要翻译： 一种磁记录介质，其具有直接形成在衬底40上的衬底表面底涂层形成的第一底涂层40,40'，直接形成在第一底涂层40,40'上的第二底涂层42,42'，磁性膜43,43' 形成在第二底涂层42,42'上，以及形成在磁性膜43,43'上的保护膜44,44'。 具有大量氧的簇分散在第一和第二底涂层的边界面上。 优选地，第一底涂层由包含两种元素的合金制成，其中在250℃的温度下元素的氧化物形成标准自由能的差ΔG°大。

公开(公告)号：US06623874B2

公开(公告)日：2003-09-23

申请号：US09888523

申请日：2001-06-26

申请人： Tetsuya Kanbe ,  Yotsuo Yahisa ,  Yoshibumi Matsuda ,  Jo Inagaki ,  Koji Sakamoto

发明人： Tetsuya Kanbe ,  Yotsuo Yahisa ,  Yoshibumi Matsuda ,  Jo Inagaki ,  Koji Sakamoto

IPC分类号： G11B566

CPC分类号： G11B5/7325 ,  G11B5/00 ,  G11B5/656 ,  Y10S428/90 ,  Y10T428/12465 ,  Y10T428/12854 ,  Y10T428/12944

摘要： The longitudinal magnetic recording medium includes a non-magnetic substrate, a first underlayer having at least one of an amorphous structure and a fine crystal structure formed on the non-magnetic substrate, a second underlayer having a body-centered cubic structure formed on the first underlayer, a third underlayer having a hexagonal closed packed structure formed on the second underlayer, and a magnetic layer having the hexagonal closed packed structure formed on the third underlayer, wherein the third underlayer is composed of an alloy containing Co and Ru.

公开(公告)号：US6014275A

公开(公告)日：2000-01-11

申请号：US701705

申请日：1996-08-22

申请人： Hajime Aoi ,  Toshiaki Tsuyoshi ,  Makoto Koizumi ,  Nobumasa Nishiyama ,  Yoshibumi Matsuda ,  Takuji Ogawa ,  Kazuhisa Shiraishi

发明人： Hajime Aoi ,  Toshiaki Tsuyoshi ,  Makoto Koizumi ,  Nobumasa Nishiyama ,  Yoshibumi Matsuda ,  Takuji Ogawa ,  Kazuhisa Shiraishi

IPC分类号： G11B5/02 ,  G11B5/00 ,  G11B5/012 ,  G11B5/09 ,  G11B5/39 ,  G11B5/40 ,  G11B5/55 ,  G11B5/596 ,  G11B19/02 ,  G11B19/04 ,  G11B27/30 ,  G11B27/36 ,  G11B5/03

CPC分类号： G11B19/04 ,  G11B19/02 ,  G11B27/3027 ,  G11B27/36 ,  G11B5/00 ,  G11B5/012 ,  G11B5/40 ,  G11B5/5547 ,  G11B2005/0016 ,  G11B2005/0018 ,  G11B5/59683

摘要： In a magnetic recording drive having a plurality of magnetic heads each employing a magnetoresistive sensor for the purpose of averaging the time required for sense currents to be caused to flow through the respective magnetoresistive sensors to shorten the longest reproducing time and to suppress the degradation of the characteristics due to the electromigration, thereby improving the reliability of the magnetic recording drive, the magnetic recording drive includes circuits for averaging the useful life depending on the currents caused to flow through the respective magnetoresistive sensors among the plurality of magnetic heads, whereby the time required for the sense current to be caused to flow through one MR reproducing head is greatly shortened. Therefore, the levels of outputs of the MR reproducing heads can be increased without reduction of the reliability and thus the reliability of the magnetic recording drive can be improved.

摘要翻译： 在具有多个磁头的磁记录驱动器中，每个磁头采用磁阻传感器，用于平均要使感应电流流过各磁阻传感器所需的时间，以缩短最长再现时间并抑制 由于电迁移的特性，从而提高了磁记录驱动器的可靠性，磁记录驱动器包括用于根据流过多个磁头中的相应磁阻传感器的电流来平均使用寿命的电路，由此所需的时间 使得通过一个MR再现头流动的感测电流大大缩短。 因此，可以在不降低可靠性的情况下增加MR再现头的输出电平，从而可以提高磁记录驱动器的可靠性。

公开(公告)号：US5736235A

公开(公告)日：1998-04-07

申请号：US740708

申请日：1991-08-06

申请人： Yoshibumi Matsuda ,  Masaaki Futamoto ,  Yoshinori Miyamura ,  Tokuho Takagaki ,  Hisashi Takano ,  Fumio Kugiya ,  Takeshi Nakao ,  Kyo Akagi ,  Mikio Suzuki ,  Hirotsugu Fukuoka ,  Takayuki Munemoto

发明人： Yoshibumi Matsuda ,  Masaaki Futamoto ,  Yoshinori Miyamura ,  Tokuho Takagaki ,  Hisashi Takano ,  Fumio Kugiya ,  Takeshi Nakao ,  Kyo Akagi ,  Mikio Suzuki ,  Hirotsugu Fukuoka ,  Takayuki Munemoto

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

CPC分类号： G11B5/66 ,  G11B5/64 ,  Y10S428/90 ,  Y10T428/24942 ,  Y10T428/2495

摘要： A magnetic recording medium, its fabrication method, and a magnetic recording apparatus in which both saturation induction and coercive force of a magnetic film is made high as they are near a surface of the recording medium. A high density information recording can be made higher than 50 kFCI in linear recording density even for spacing around 0.2 .mu.m.

摘要翻译： 一种磁记录介质，其制造方法和磁记录装置，其中磁记录介质的表面附近磁饱和感应和磁性膜的矫顽力均较高。 即使对于0.2μm左右的间隔，高密度信息记录也可以使线性记录密度高于50kFCI。

公开(公告)号：US06623873B1

公开(公告)日：2003-09-23

申请号：US09444560

申请日：1999-11-19

申请人： Yoshibumi Matsuda ,  Yotsuo Yahisa ,  Koji Sakamoto ,  Yuzuru Hosoe ,  Akira Kato

发明人： Yoshibumi Matsuda ,  Yotsuo Yahisa ,  Koji Sakamoto ,  Yuzuru Hosoe ,  Akira Kato

IPC分类号： G11B566

CPC分类号： G11B5/656 ,  G11B5/66 ,  G11B5/732 ,  G11B5/7325 ,  Y10S428/90 ,  Y10T428/12854

摘要： A magnetic recording medium includes an underlayer of a nonmagnetic alloy containing chromium and titanium, a magnetic layer of a Co—Cr—Pt—Ta or Co—Cr—Pt—B alloy, and an intermediate layer of a Co—Cr—Pt alloy and being disposed between the underlayer and the magnetic layer, thereby carrying out high-density information recording and reproducing operation.

摘要翻译： 磁记录介质包括含有铬和钛的非磁性合金的底层，Co-Cr-Pt-Ta或Co-Cr-Pt-B合金的磁性层和Co-Cr-Pt合金的中间层 并且设置在底层和磁性层之间，从而进行高密度信息记录和再现操作。

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.