公开(公告)号：US5808843A

公开(公告)日：1998-09-15

申请号：US890170

申请日：1992-05-29

申请人： Toshio Kobayashi ,  Isamu Yuito ,  Masahiro Kitada ,  Noboru Shimizu ,  Naoki Koyama

发明人： Toshio Kobayashi ,  Isamu Yuito ,  Masahiro Kitada ,  Noboru Shimizu ,  Naoki Koyama

IPC分类号： G11B5/31 ,  G11B5/39

CPC分类号： G11B5/3932 ,  G11B5/3903 ,  G11B5/398 ,  G11B5/3116 ,  G11B5/313

摘要： A magnetoresistance effect reproduction head which comprises a magnetoresistive layer having a central sensing region and an end domain control region and formed into a thin film of a ferromagnetic material, a hard magnetic layer overlapping with the end domain control region in direct contact therewith and formed into a thin film of a hard magnetic material, a magnetic field and a longitudinal magnetic bias field by ferromagnetic exchange coupling is generated for maintaining the central sensing region of the magnetoresistive layer in single domain state.

摘要翻译： 一种磁阻效应再现头，包括具有中心感测区域和端畴控制区域并形成铁磁材料薄膜的磁阻层，硬磁层与与其直接接触的端畴控制区域重叠并形成 产生硬磁材料的薄膜，通过铁磁交换耦合的磁场和纵向磁偏置场，以将磁阻层的中心感测区域保持在单域状态。

公开(公告)号：US5212609A

公开(公告)日：1993-05-18

申请号：US792630

申请日：1991-11-15

申请人： Isamu Yuito ,  Makoto Morijiri ,  Tooru Takeura ,  Naoki Koyama ,  Masahiro Kitada

发明人： Isamu Yuito ,  Makoto Morijiri ,  Tooru Takeura ,  Naoki Koyama ,  Masahiro Kitada

IPC分类号： G11B5/39

CPC分类号： G11B5/3903 ,  Y10T29/49052

摘要： A magnetoresistive head is disclosed. It comprises a lower gap film, a magnetoresistive film, a bias film, an electrode, an upper gap film, and upper shield film provided in sequence on a substrate. A protective film is provided under the upper shield film to prevent the upper gap film and electrode from the undesirable etching during patterning the upper shield film.

摘要翻译： 公开了一种磁阻头。 它包括依次设置在基板上的下间隙膜，磁阻膜，偏置膜，电极，上间隙膜和上屏蔽膜。 在上屏蔽膜下方设置有保护膜，以防止在上屏蔽膜图案化期间上间隙膜和电极不期望的蚀刻。

公开(公告)号：US5719729A

公开(公告)日：1998-02-17

申请号：US990769

申请日：1992-12-15

申请人： Naoki Koyama ,  Yoshihiro Hamakawa ,  Isamu Yuitoo ,  Kanji Kawakami ,  Kazuo Shiiki ,  Masahiro Kitada

发明人： Naoki Koyama ,  Yoshihiro Hamakawa ,  Isamu Yuitoo ,  Kanji Kawakami ,  Kazuo Shiiki ,  Masahiro Kitada

IPC分类号： G11B5/31 ,  G11B5/39 ,  G11B5/265

CPC分类号： G11B5/3967

摘要： In an inductive-write, magnetoresistive-read type magnetic head having a magnetoresistive read head and an inductive write head superimposed on each other, the magnetic center of the read head is made more coincident with the physical center of the write head by a changing of a magnetization direction of a magnetoresistive element. The recording/reproducing apparatus using this magnetic head can thus have a good S/N ratio even if the track width is narrow.

摘要翻译： 在具有叠加在一起的磁阻读取头和感应写入头的感应写入磁阻读取型磁头中，通过改变读写头的磁中心使写头的磁心与记录头的物理中心更一致 磁阻元件的磁化方向。 因此，即使磁道宽度窄，使用该磁头的记录/再现装置也可以具有良好的S / N比。

公开(公告)号：US4663607A

公开(公告)日：1987-05-05

申请号：US737873

申请日：1985-05-28

申请人： Masahiro Kitada ,  Hideo Tanabe ,  Noboru Shimizu ,  Hiroshi Tsuchiya ,  Masao Katsumata

发明人： Masahiro Kitada ,  Hideo Tanabe ,  Noboru Shimizu ,  Hiroshi Tsuchiya ,  Masao Katsumata

IPC分类号： G01R33/09 ,  G01R33/06 ,  G11B5/39 ,  H01L41/12 ,  H01L43/08 ,  H01L43/10 ,  H01L43/04

CPC分类号： G11B5/3903 ,  H01L41/125 ,  H01L43/08 ,  G11B5/3948

摘要： A magnetroresistive element formed by laminating a plurality of metallic magnetoresistance effect films having magnetostriction of different signs on a substrate. The magnetoresistive element can be formed to exhibit zero magnetostriction or to exhibit magnetostriction of any desired value. Further, the magnetoresistive element exhibits magnetostriction that changes little with the change in the film composition. The metallic magnetoresistance effect films preferably have positive and negative magnetostriction with an absolute value not greater than 15.times.10.sup.-6.

摘要翻译： 通过在衬底上层叠具有不同符号的磁致伸缩的多个金属磁阻效应膜而形成的磁阻元件。 磁阻元件可以形成为表现出零磁致伸缩或表现出任何所需值的磁致伸缩。 此外，磁阻元件显示随着膜组成的变化而变化很小的磁致伸缩。 金属磁阻效应膜优选具有绝对值不大于15×10 -6的正和负磁致伸缩。

公开(公告)号：US06297929B1

公开(公告)日：2001-10-02

申请号：US09557002

申请日：2000-04-20

申请人： Hisashi Takano ,  Masahiro Kitada ,  Mikio Suzuki

发明人： Hisashi Takano ,  Masahiro Kitada ,  Mikio Suzuki

IPC分类号： G11B5127

CPC分类号： G11B5/31 ,  G11B5/012 ,  G11B5/09 ,  G11B5/1272 ,  G11B5/17 ,  G11B5/3109 ,  G11B5/313 ,  G11B5/39 ,  G11B5/3967

摘要： The proposed magnetic storage apparatus has the following features. The frequency at which data is recorded is selected to be 45 MHz. The thickness, resistivity and relative permeability of the magnetic film of which the magnetic poles of the magnetic head used in the apparatus are made are designed considering the eddy current loss. Also, the relation of &mgr;d2/&rgr;≦500 is satisfied where d (&mgr;m) is the thickness of the magnetic film of which the magnetic poles of the magnetic head are made, &rgr;(&mgr;&OHgr;-cm) is the resistivity, and &mgr;is the relative permeability in a low-frequency range. Under these conditions, the amount of attenuation of recording magnetic field is reduced to 10% or below, and problems of writing blur and overwrite value variation which occur as the recording frequency changes can be solved. Moreover, the media data rate is 15 megabytes per sec., and the areal data-recording density is 500 megabits per square inch or more.

摘要翻译： 所提出的磁存储装置具有以下特征。 记录数据的频率选择为45 MHz。 考虑到涡电流损耗，设计制造设备中使用的磁头的磁极的磁性膜的厚度，电阻率和相对磁导率。 此外，在d（mum）是制造磁头的磁极的磁性膜的厚度，rho（μOMEGA-cm）是电阻率的情况下，满足mud2 / rho <= 500的关系，并且mu 在低频范围内的相对磁导率。 在这些条件下，记录磁场的衰减量降低到10％以下，可以解决写入模糊和记录频率变化时的覆盖值变化的问题。 此外，媒体数据速率为每秒15兆字节，而面积数据记录密度为500兆比特每平方英寸或更多。

公开(公告)号：US6064546A

公开(公告)日：2000-05-16

申请号：US3506

申请日：1998-01-06

申请人： Hisashi Takano ,  Masahiro Kitada ,  Mikio Suzuki

发明人： Hisashi Takano ,  Masahiro Kitada ,  Mikio Suzuki

IPC分类号： G11B5/012 ,  G11B5/02 ,  G11B5/09 ,  G11B5/127 ,  G11B5/17 ,  G11B5/31 ,  G11B5/39 ,  G11B5/23

CPC分类号： G11B5/31 ,  G11B5/012 ,  G11B5/09 ,  G11B5/1272 ,  G11B5/17 ,  G11B5/3109 ,  G11B5/313 ,  G11B5/39 ,  G11B5/3967

摘要： The proposed magnetic storage apparatus has the following features. The frequency at which data is recorded is selected to be 45 MHz. The thickness, resistivity and relative permeability of the magnetic film of which the magnetic poles of the magnetic head used in the apparatus are made are designed considering the eddy current loss. Also, the relation of .mu.d.sup.2 /.rho..ltoreq.500 is satisfied where d (.mu.m) is the thickness of the magnetic film of which the magnetic poles of the magnetic head are made, .rho. (.mu..OMEGA.-cm) is the resistivity, and .mu. is the relative permeability in a low-frequency range. Under these conditions, the amount of attenuation of recording magnetic field is reduced to 10% or below, and problems of writing blur and overwrite value variation which occur as the recording frequency changes can be solved. Moreover, the media data rate is 15 megabytes per sec., and the areal data-recording density is 500 megabits per square inch or more.

摘要翻译： 所提出的磁存储装置具有以下特征。 记录数据的频率选择为45 MHz。 考虑到涡电流损耗，设计制造设备中使用的磁头的磁极的磁性膜的厚度，电阻率和相对磁导率。 此外，满足μd2 / rho <500的关系，其中d（μm）是制造磁头的磁极的磁膜的厚度，rho（mu OMEGA-cm）是电阻率 ，mu是低频范围内的相对磁导率。 在这些条件下，记录磁场的衰减量降低到10％以下，可以解决写入模糊和记录频率变化时的覆盖值变化的问题。 此外，媒体数据速率为每秒15兆字节，而面积数据记录密度为500兆比特每平方英寸或更多。

公开(公告)号：US06452758B2

公开(公告)日：2002-09-17

申请号：US09860645

申请日：2001-05-21

申请人： Hisashi Takano ,  Masahiro Kitada ,  Mikio Suzuki

发明人： Hisashi Takano ,  Masahiro Kitada ,  Mikio Suzuki

IPC分类号： G11B5127

CPC分类号： G11B5/31 ,  G11B5/012 ,  G11B5/09 ,  G11B5/1272 ,  G11B5/17 ,  G11B5/3109 ,  G11B5/313 ,  G11B5/39 ,  G11B5/3967

摘要： The proposed magnetic storage apparatus has the following features. The frequency at which data is recorded is selected to be 45 MHz. The thickness, resistivity and relative permeability of the magnetic film of which the magnetic poles of the magnetic head used in the apparatus are made are designed considering the eddy current loss. Also, the relation of &mgr;d2/&rgr;≦500 is satisfied where d (&mgr;m) is the thickness of the magnetic film of which the magnetic poles of the magnetic head are made, &rgr; (&mgr;&OHgr;-cm) is the resistivity, and &mgr; is the relative permeability in a low-frequency range. Under these conditions, the amount of attenuation of recording magnetic field is reduced to 10% or below, and problems of writing blur and overwrite value variation which occur as the recording frequency changes can be solved. Moreover, the media data rate is 15 megabytes per sec., and the areal data-recording density is 500 megabits per square inch or more.

摘要翻译： 所提出的磁存储装置具有以下特征。 记录数据的频率选择为45 MHz。 考虑到涡电流损耗，设计制造设备中使用的磁头的磁极的磁性膜的厚度，电阻率和相对磁导率。 此外，在d（mum）是制造磁头的磁极的磁性膜的厚度，rho（μOMEGA-cm）是电阻率的情况下，满足mud2 / rho <= 500的关系，并且mu 在低频范围内的相对磁导率。 在这些条件下，记录磁场的衰减量降低到10％以下，可以解决写入模糊和记录频率变化时的覆盖值变化的问题。 此外，媒体数据速率为每秒15兆字节，而面积数据记录密度为500兆比特每平方英寸或更多。

公开(公告)号：US5337203A

公开(公告)日：1994-08-09

申请号：US873785

申请日：1992-04-27

申请人： Masahiro Kitada ,  Hideo Tanabe ,  Noboru Shimizu ,  Naoki Koyama ,  Toshio Kobayashi

发明人： Masahiro Kitada ,  Hideo Tanabe ,  Noboru Shimizu ,  Naoki Koyama ,  Toshio Kobayashi

IPC分类号： G11B5/39 ,  H01L43/08 ,  H01L43/10

CPC分类号： G11B5/3903 ,  H01L43/08 ,  H01L43/10

摘要： A magnetoresistive head having a structure based on a two-layer film having a first film exhibiting a magnetoresistive effect and a second film comprising Nb and at least one element selected from the group consisting of Ti, Cr, Mo, Zr, W, Pt, Re, V, Hf, Ta, Rh, Ni and Ru as an additive element.

摘要翻译： 具有基于具有显示磁阻效应的第一膜的二层膜的结构的磁致电阻头和包含Nb和选自Ti，Cr，Mo，Zr，W，Pt中的至少一种元素的第二膜， Re，V，Hf，Ta，Rh，Ni和Ru作为添加元素。

公开(公告)号：US4769093A

公开(公告)日：1988-09-06

申请号：US63773

申请日：1987-06-24

申请人： Masahiro Kitada ,  Hideo Tanabe ,  Noboru Shimizu

发明人： Masahiro Kitada ,  Hideo Tanabe ,  Noboru Shimizu

IPC分类号： G11B5/39 ,  H01L43/08 ,  H01F1/04

CPC分类号： H01L43/08

摘要： A magnetoresistive device includes a magnetoresistive film made of permalloy alloy. This thin film is formed on a substrate by sputtering or vapor deposition method. Thereafter, the thin film is heated to a temperature between 200.degree. C. and 350.degree. C. by flowing an electric current therethrough or irradiating the thin film with an electron or laser beam. It is desirable that the heat treatment is effected in an alternating magnetic field. The permalloy alloy may contain at least one element including Rh, Ru, Mo, Cr and V.

摘要翻译： 磁阻器件包括由坡莫合金合金制成的磁阻膜。 该薄膜通过溅射或气相沉积法形成在基板上。 此后，通过使电流流过其中或用电子或激光束照射薄膜将薄膜加热至200℃至350℃的温度。 理想的是，在交变磁场中进行热处理。 坡莫合金可以含有至少一种包括Rh，Ru，Mo，Cr和V的元素。

公开(公告)号：US4544591A

公开(公告)日：1985-10-01

申请号：US537512

申请日：1983-09-30

申请人： Yasutaro Uesaka ,  Sadao Hishiyama ,  Masahiro Kitada ,  Noboru Shimizu ,  Hideo Tanabe ,  Hideo Fujiwara

发明人： Yasutaro Uesaka ,  Sadao Hishiyama ,  Masahiro Kitada ,  Noboru Shimizu ,  Hideo Tanabe ,  Hideo Fujiwara

IPC分类号： G11B5/00 ,  G11B5/64 ,  G11B5/66 ,  G11B5/667 ,  G11B5/70 ,  G11B5/738 ,  H01F10/06 ,  H01F10/12 ,  H01F10/13 ,  H01F10/18 ,  H01F10/187 ,  G11B25/04

CPC分类号： G11B5/00 ,  G11B5/66 ,  G11B5/70 ,  Y10S428/90 ,  Y10T428/24975

摘要： In a perpendicular magnetic recording medium comprising a high permeability film and a perpendicular magnetization film which are laminated on a non-magnetic substrate, a perpendicular magnetic recording medium is provided wherein a permanent magnet film is further sandwiched between the non-magnetic substrate and the high permeability film, thereby eliminating a spike noise.

摘要翻译： 在包括层叠在非磁性基板上的高导磁率膜和垂直磁化膜的垂直磁记录介质中，提供垂直磁记录介质，其中将永磁体膜进一步夹在非磁性基板和高磁性基板之间 渗透膜，从而消除尖峰噪声。