公开(公告)号：US5723198A

公开(公告)日：1998-03-03

申请号：US258923

申请日：1994-06-13

申请人： Yuzuru Hosoe ,  Yoshihiro Shiroishi ,  Akira Ishikawa ,  Futoshi Tomiyama ,  Kazuetsu Yoshida ,  Tomoo Yamamoto ,  Yotsuo Yahisa ,  Akira Osaki ,  Katsuo Abe ,  Shinji Narishige ,  Naoki Kodama ,  Kiwamu Tanahashi ,  Emi Mangyo

发明人： Yuzuru Hosoe ,  Yoshihiro Shiroishi ,  Akira Ishikawa ,  Futoshi Tomiyama ,  Kazuetsu Yoshida ,  Tomoo Yamamoto ,  Yotsuo Yahisa ,  Akira Osaki ,  Katsuo Abe ,  Shinji Narishige ,  Naoki Kodama ,  Kiwamu Tanahashi ,  Emi Mangyo

IPC分类号： G11B5/66

CPC分类号： G11B5/66 ,  Y10S428/90 ,  Y10T428/24355 ,  Y10T428/24942 ,  Y10T428/265

摘要： In a magnetic recording system including magnetic recording media, a rotation driving unit for driving these magnetic recording media, read/write magnetic heads, driving apparatus for driving these read/write magnetic heads, and a read/write signal processing apparatus, a reading portion of the respective magnetic heads is arranged by a magnetoresistive head. The magnetic recording media are constructed of multi-layered magnetic media having a plurality of magnetic layers fabricated directly, or via underlayers on a non-magnetic disk substrate, and of non-magnetic intermediate layers arranged among these non-magnetic layers. Furthermore, one coercivity which is measured by applying a magnetic field along a circumferential direction of the magnetic recording media, is selected to be larger than the other coercivity which is measured by applying a magnetic field along a radial direction of the magnetic recording media, so that a higher signal-to-noise ratio is achieved, as compared with that of the conventional magnetic recording system. Since the thickness of the non-magnetic intermediate layers is smaller than or equal to 5 nm, and also the total layer is smaller than or equal to 5 nm, and also the total layer number of the plural magnetic layers is selected to be odd, better characteristics can be achieved. Accordingly, since the MTBF (Mean Time Before Failure) is longer than or equal to 0.15 million hours with high recording density, and the disk substrate and the magnetic head sliders can be mounted at high packaging density, a compact and high-capacity magnetic recording system can be obtained.

摘要翻译： 在包括磁记录介质的磁记录系统中，用于驱动这些磁记录介质的旋转驱动单元，读/写磁头，用于驱动这些读/写磁头的驱动装置以及读/写信号处理装置，读/ 相应的磁头由磁阻头安排。 磁记录介质由具有直接制造的多个磁性层或通过非磁盘基板上的底层以及布置在这些非磁性层之间的非磁性中间层的多层磁性介质构成。 此外，通过沿着磁记录介质的圆周方向施加磁场来测量的一个矫顽力被选择为大于通过沿着磁记录介质的径向方向施加磁场而测量的其他矫顽力，因此， 与常规磁记录系统相比，实现了更高的信噪比。 由于非磁性中间层的厚度小于或等于5nm，并且总层小于或等于5nm，并且多个磁性层的总层数也被选择为奇数， 可以实现更好的特性。 因此，由于MTBF（平均故障间隔时间）长于或等于0.15万小时，具有高记录密度，并且盘基板和磁头滑块可以以高封装密度安装，紧凑且高容量的磁记录 系统可以得到。

公开(公告)号：US07157162B2

公开(公告)日：2007-01-02

申请号：US11036064

申请日：2005-01-18

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： G11B5/65

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

摘要： A magnetic recording medium having a substrate, an under-layer formed on the substrate, a magnetic layer formed on the substrate and a protective layer formed on the magnetic layer. The magnetic layer comprises Co, Cr and Pt with a thickness being from 10 nm to 22 nm. Further, a coercivity of the magnetic layer is not less than 2000 Oe, and a fluctuation field of magnetic viscosity at a field strength equal to remanence coercivity or coercivity is not less than 30 Oe.

摘要翻译： 具有基板的磁记录介质，在基板上形成的下层，形成在基板上的磁性层和形成在磁性层上的保护层。 磁性层包括厚度为10nm至22nm的Co，Cr和Pt。 此外，磁性层的矫顽力不小于2000Oe，磁场强度等于剩磁矫顽力或矫顽磁力的磁场粘度的波动范围不小于30Oe。

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：US06613428B2

公开(公告)日：2003-09-02

申请号：US09849404

申请日：2001-05-07

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： G11B564

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

摘要： A thin film magnetic recording medium including a magnetic layer having a fluctuation field defined as S/Xirr, where S is magnetic viscosity and Xirr is irreversible susceptibility Xirr. The fluctuation field of the magnetic layer is not less than 15 oersteds.

摘要翻译： 一种薄膜磁记录介质，包括具有定义为S / Xirr的波动场的磁性层，其中S是磁粘度和Xirr是不可逆的磁化率Xirr。 磁性层的波动场不小于15奥斯特。

公开(公告)号：US06310748B1

公开(公告)日：2001-10-30

申请号：US08521363

申请日：1995-08-31

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： G11B566

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

摘要： A ferromagnetic thin film is used to provide a magnetic recording medium whose noise is low and whose S/N 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： 铁磁薄膜用于提供噪声低且S / N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：US20050123806A1

公开(公告)日：2005-06-09

申请号：US11036064

申请日：2005-01-18

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： A magnetic recording medium having a substrate, an under-layer formed on the substrate, a magnetic layer formed on the substrate and a protective layer formed on the magnetic layer. The magnetic layer comprises Co, Cr and Pt with a thickness being from 10 nm to 22 nm. Further, a coercivity of the magnetic layer is not less than 2000 Oe, and a fluctuation field of magnetic viscosity at a field strength equal to remanence coercivity or coercivity is not less than 30 Oe.

摘要翻译： 具有基板的磁记录介质，在基板上形成的下层，形成在基板上的磁性层和形成在磁性层上的保护层。 磁性层包括厚度为10nm至22nm的Co，Cr和Pt。 此外，磁性层的矫顽力不小于2000Oe，磁场强度等于剩磁矫顽力或矫顽磁力的磁场粘度的波动范围不小于30Oe。

公开(公告)号：US5671107A

公开(公告)日：1997-09-23

申请号：US399221

申请日：1995-03-06

申请人： Katsuya Mitsuoka ,  Hiroshi Fukui ,  Makoto Aihara ,  Masanori Tanabe ,  Moriaki Fuyama ,  Shinji Narishige ,  Yutaka Sugita ,  Yoshihiro Shiroishi ,  Hajime Aoi ,  Yokuo Saitoh ,  Kanji Kawakami ,  Yoshikazu Tsuji ,  Masaaki Hayashi ,  Kazuo Nakagoshi

发明人： Katsuya Mitsuoka ,  Hiroshi Fukui ,  Makoto Aihara ,  Masanori Tanabe ,  Moriaki Fuyama ,  Shinji Narishige ,  Yutaka Sugita ,  Yoshihiro Shiroishi ,  Hajime Aoi ,  Yokuo Saitoh ,  Kanji Kawakami ,  Yoshikazu Tsuji ,  Masaaki Hayashi ,  Kazuo Nakagoshi

IPC分类号： G11B5/012 ,  G11B5/39 ,  G11B5/31 ,  G11B5/60

CPC分类号： G11B5/012 ,  G11B5/39

摘要： A magnetic disc apparatus has a large recording density of 120 megabits per square inch or more, and defines a relationship among a pole thickness (Pt) of thin-film magnetic heads disposed in the magnetic disc apparatus, and a saturation flux density (Bs) of cores of the heads and a recording wavelength (.lambda.) for the thin film magnetic discs have a coercivity of 1800 Oe or more, wherein a levitation space between the head and the disc is 0.15 .mu.m or less.

摘要翻译： 磁盘装置具有120兆比特每平方英寸或更大的记录密度，并且限定了设置在磁盘装置中的薄膜磁头的极厚度（Pt）与饱和磁通密度（Bs）之间的关系， 的磁头的磁芯和用于薄膜磁盘的记录波长（λ）具有1800Oe或更高的矫顽力，其中磁头和磁盘之间的悬浮空间为0.15μm或更小。

公开(公告)号：US07221544B2

公开(公告)日：2007-05-22

申请号：US10206751

申请日：2002-07-26

申请人： Takayoshi Ohtsu ,  Shinji Narishige

发明人： Takayoshi Ohtsu ,  Shinji Narishige

IPC分类号： G11B5/66

CPC分类号： G11B5/00 ,  G11B5/03 ,  G11B5/1278 ,  G11B5/3967 ,  G11B2005/001 ,  G11B2005/0016

摘要： Formation of magnetic domains in a perpendicularly magnetized medium comprising an underlayer of a soft magnetic layer is prevented by appropriate magnetic domain control in the soft magnetic layer. One method controls magnetic domains of the soft magnetic layer by applying an external magnetic field to the medium. Another method provides a mechanism in the magnetic head for generating a magnetic field to control the magnetic domains of the soft magnetic layer of the medium.

摘要翻译： 通过在软磁性层中适当的磁畴控制来防止在包括软磁性层的底层的垂直磁化介质中形成磁畴。 一种方法是通过向介质施加外部磁场来控制软磁性层的磁畴。 另一种方法提供了磁头中用于产生磁场以控制介质的软磁性层的磁畴的机构。

公开(公告)号：US5296979A

公开(公告)日：1994-03-22

申请号：US963039

申请日：1992-10-19

申请人： Takashi Kawabe ,  Moriaki Fuyama ,  Shinji Narishige ,  Masatoshi Tsuchiya ,  Eiji Ashida ,  Makoto Morijiri ,  Hideki Yamazaki ,  Yutaka Sugita ,  Hiroshi Fukui ,  Tadayuki Iwakura ,  Makoto Aihara ,  Makoto Saito ,  Shunichiro Kuwatsuka ,  Hiroshi Ikeda ,  Yokuo Saitoh

发明人： Takashi Kawabe ,  Moriaki Fuyama ,  Shinji Narishige ,  Masatoshi Tsuchiya ,  Eiji Ashida ,  Makoto Morijiri ,  Hideki Yamazaki ,  Yutaka Sugita ,  Hiroshi Fukui ,  Tadayuki Iwakura ,  Makoto Aihara ,  Makoto Saito ,  Shunichiro Kuwatsuka ,  Hiroshi Ikeda ,  Yokuo Saitoh

IPC分类号： G11B5/012 ,  G11B5/31

CPC分类号： G11B5/012 ,  G11B5/3116

摘要： A magnetic disc apparatus includes a magnetic disc for recording information; a thin film magnetic head including a magnetic pole structure having an upper magnetic pole tip and a lower magnetic pole tip arranged to provide a magnetic gap at respective end portions thereof for writing and reading information in and from the magnetic disc; a device for rotating the magnetic disc; and a device for positioning the thin film magnetic head; the upper and lower magnetic pole tips having different contours at the respective end portions as viewed from a side confronting the magnetic disc wherein the difference (.DELTA.CW in .mu.m) in the width, along the magnetic gap, of the upper magnetic pole tip and the width, along the magnetic gap, of the lower magnetic pole tip satisfies the relation0

摘要翻译： 磁盘装置包括用于记录信息的磁盘; 包括具有上磁极端头和下磁极端头的磁极结构的薄膜磁头，其布置成在其各个端部处提供磁隙以在磁盘中写入和读取信息; 用于旋转磁盘的装置; 以及用于定位薄膜磁头的装置; 所述上磁极尖端和下磁极尖在相应端部处具有不同的轮廓，从与磁盘相对的一侧观察，其中沿着上部的磁隙的宽度（（delta）CW）（（m））） 磁极尖端和下磁极尖端的磁隙的宽度满足磁道密度Tr为每英寸1800或更多磁道的磁盘的关系0 <（Delta）CW <= 5000 / Tr。

公开(公告)号：US4939610A

公开(公告)日：1990-07-03

申请号：US252603

申请日：1988-10-03

申请人： Shinji Narishige ,  Masaaki Sano ,  Kouichi Nishioka ,  Takao Imagawa ,  Masanobu Hanazono ,  Tetsuo Kobayashi ,  Toshihiro Yoshida

发明人： Shinji Narishige ,  Masaaki Sano ,  Kouichi Nishioka ,  Takao Imagawa ,  Masanobu Hanazono ,  Tetsuo Kobayashi ,  Toshihiro Yoshida

IPC分类号： G11B5/31 ,  H01F41/18

CPC分类号： H01F41/18 ,  G11B5/31

摘要： A thin film magnetic head is disclosed which includes a substrate, a first magnetic core disposed on the substrate, a second magnetic core forming a magnetic path in conjunction with the first magnetic core, a conductor coil wound in the magnetic path and a gap formed between ends of the first magnetic core and the second magnetic core. At least one of the first magnetic core and the second magnetic core includes a thin film of a cobalt alloy. The cobalt alloy includes 20-70 atomic percent of cobalt, 20-60 atomic percent of nickel, 12-30 atomic percent of iron and 5-32 atomic percent of palladium.

摘要翻译： 公开了一种薄膜磁头，其包括基板，设置在基板上的第一磁芯，与第一磁芯一起形成磁路的第二磁芯，缠绕在磁路中的导体线圈和形成在磁路之间的间隙 第一磁芯和第二磁芯的端部。 第一磁芯和第二磁芯中的至少一个包括钴合金薄膜。 钴合金包括20-70原子％的钴，20-60原子％的镍，12-30原子％的铁和5-32原子百分比的钯。