公开(公告)号：US06657826B2

公开(公告)日：2003-12-02

申请号：US09920821

申请日：2001-08-03

申请人： Koji Shimazawa ,  Koichi Terunuma

发明人： Koji Shimazawa ,  Koichi Terunuma

IPC分类号： G11B530

CPC分类号： B82Y25/00 ,  B82Y10/00 ,  G11B5/012 ,  G11B5/3903 ,  G11B5/4806 ,  G11B2005/3996 ,  Y10T29/49032 ,  Y10T29/49043 ,  Y10T29/49044 ,  Y10T29/49046 ,  Y10T29/49048 ,  Y10T29/49052

摘要： A magnetoresisive device comprises: an MR element having two surfaces that face toward opposite directions and two side portions that face toward opposite directions; two bias field applying layers that are located adjacent to the side portions of the MR element and apply a longitudinal bias magnetic field to the MR element; and two electrode layers that are located adjacent to one of the surfaces of each of the bias field applying layers and feed a sense current to the MR element. The electrode layers overlap the one of the surfaces of the MR element. The magnetoresistive device further comprises two nonconductive layers that are located between the one of the surfaces of the MR element and the two electrode layers and located in two regions that include ends of the MR element near the side portions thereof, the two regions being parts of the region in which the electrode layers face toward the one of the surfaces of the MR element.

公开(公告)号：US07403358B2

公开(公告)日：2008-07-22

申请号：US11227126

申请日：2005-09-16

申请人： Koichi Terunuma ,  Koji Shimazawa ,  Akifumi Kamijima

发明人： Koichi Terunuma ,  Koji Shimazawa ,  Akifumi Kamijima

IPC分类号： G11B5/39 ,  G11B5/127

CPC分类号： G11B5/3903 ,  G11B5/3932 ,  G11B5/3967 ,  Y10T29/49046

摘要： A magnetoresistive effective film responds commensurate with an external magnetic field. Magnetic domain-controlling films apply a perpendicular biasing magnetic field to the magnetoresistive effective film. The forefronts of first electrode films constituting a pair of electrode films are overlaid on the magnetoresistive effective film, and the forefront surfaces of the first electrode films are risen at an inner angle of θ1. Second electrode films are overlaid on the first electrode films, and the forefront surfaces of the second electrode films are risen at an inner angle of θ2 smaller than the inner angle θ1.

摘要翻译： 磁阻有效膜响应与外部磁场相称。 磁畴控制膜对磁阻有效膜施加垂直偏置磁场。 构成一对电极膜的第一电极膜的前面覆盖在磁阻有效膜上，并且第一电极膜的最前面以内角θ1升高。 第二电极膜覆盖在第一电极膜上，并且第二电极膜的最前端表面以小于内角θ1的内角θ2升高。

公开(公告)号：US07082673B2

公开(公告)日：2006-08-01

申请号：US10670470

申请日：2003-09-26

申请人： Koji Shimazawa ,  Koichi Terunuma

发明人： Koji Shimazawa ,  Koichi Terunuma

IPC分类号： G11B5/127 ,  H04R31/00

CPC分类号： B82Y25/00 ,  B82Y10/00 ,  G11B5/012 ,  G11B5/3903 ,  G11B5/4806 ,  G11B2005/3996 ,  Y10T29/49032 ,  Y10T29/49043 ,  Y10T29/49044 ,  Y10T29/49046 ,  Y10T29/49048 ,  Y10T29/49052

摘要： A magnetoresisive device comprises: an MR element having two surfaces that face toward opposite directions and two side portions that face toward opposite directions; two bias field applying layers that are located adjacent to the side portions of the MR element and apply a longitudinal bias magnetic field to the MR element; and two electrode layers that are located adjacent to one of the surfaces of each of the bias field applying layers and feed a sense current to the MR element. The electrode layers overlap the one of the surfaces of the MR element. The magnetoresistive device further comprises two nonconductive layers that are located between the one of the surfaces of the MR element and the two electrode layers and located in two regions that include ends of the MR element near the side portions thereof, the two regions being parts of the region in which the electrode layers face toward the one of the surfaces of the MR element.

摘要翻译： 磁感应装置包括：MR元件，其具有面向相反方向的两个表面和面向相反方向的两个侧面部分; 两个偏置场施加层，其位于与MR元件的侧部相邻并且向MR元件施加纵向偏置磁场; 以及两个电极层，其位于每个偏置场施加层的一个表面附近，并将感测电流馈送到MR元件。 电极层与MR元件的一个表面重叠。 磁阻器件还包括位于MR元件的一个表面和两个电极层之间的两个非导电层，并且位于两个区域中，该两个区域包括MR元件的靠近其侧部的端部，两个区域是 电极层朝向MR元件的一个表面的区域。

公开(公告)号：US07221546B2

公开(公告)日：2007-05-22

申请号：US10833162

申请日：2004-04-28

申请人： Koichi Terunuma ,  Koji Shimazawa ,  Yoshihiro Tsuchiya

发明人： Koichi Terunuma ,  Koji Shimazawa ,  Yoshihiro Tsuchiya

IPC分类号： G11B5/39 ,  G11B5/127

CPC分类号： G11B5/31 ,  Y10T29/49041 ,  Y10T29/49046

摘要： A longitudinal bias magnetic field control layer applies a counter bias magnetic field to a soft magnetic layer that is antiparallel (in opposite direction) to a longitudinal bias magnetic field. A magnitude of the counter bias magnetic field applied to the soft magnetic layer by the longitudinal bias magnetic field control layer is set smaller than that of the longitudinal bias magnetic field at a track center portion of the soft magnetic layer applied by a pair of bias magnetic field applying layers. A substantial longitudinal bias magnetic field is substantially applied to the soft magnetic layer in the same direction as that of the longitudinal bias magnetic field, and a magnitude of the substantial longitudinal bias magnetic field is maximum at both end portions of the soft magnetic layer and is weakened at the center portion of the soft magnetic layer.

摘要翻译： 纵向偏置磁场控制层将反偏置磁场施加到与纵向偏置磁场反平行（相反方向）的软磁性层。 通过纵向偏置磁场控制层施加到软磁性层的反向偏置磁场的大小被设定为小于通过一对偏置磁铁施加的软磁性层的轨道中心部分处的纵向偏置磁场的大小 场施加层。 基本的纵向偏置磁场基本上与纵向偏置磁场的方向相同地施加到软磁性层，并且在软磁性层的两个端部处，基本的纵向偏置磁场的大小最大，并且是 在软磁性层的中心部分变弱。

公开(公告)号：US20050013063A1

公开(公告)日：2005-01-20

申请号：US10889053

申请日：2004-07-13

申请人： Kosuke Tanaka ,  Koji Shimazawa ,  Koichi Terunuma ,  Tomoaki Shimizu

发明人： Kosuke Tanaka ,  Koji Shimazawa ,  Koichi Terunuma ,  Tomoaki Shimizu

IPC分类号： G11B5/39 ,  G11B5/33 ,  H01F10/16 ,  H01L43/08

CPC分类号： G11B5/3932 ,  B82Y25/00 ,  G01R33/093 ,  G01R33/098 ,  Y10T428/1107 ,  Y10T428/1121

摘要： A pair of domain control layers are disposed on both sides of the track width direction of the MR film so as to be separated from each other such that the MR film is held therebetween, and apply a longitudinal magnetic field to the MR film (free layer). The MR film is flanked by the domain control layers, each including a layer structure constituted by a base layer, a ferromagnetic layer, and a hard magnetic layer. The base layer causes the hard magnetic layer to have a magnetization direction aligning with an in-plane direction, so as to enhance the coercive force of the hard magnetic layer.

摘要翻译： 一对域控制层设置在MR膜的轨道宽度方向的两侧，以便彼此分离，使得MR膜保持在它们之间，并将纵向磁场施加到MR膜（自由层 ）。 MR膜侧面是域控制层，每个层包括由基层，铁磁层和硬磁性层构成的层结构。 基层使得硬磁性层具有与面内方向对准的磁化方向，以增强硬磁性层的矫顽力。

公开(公告)号：US07259940B2

公开(公告)日：2007-08-21

申请号：US10889053

申请日：2004-07-13

申请人： Kosuke Tanaka ,  Koji Shimazawa ,  Koichi Terunuma ,  Tomoaki Shimizu

发明人： Kosuke Tanaka ,  Koji Shimazawa ,  Koichi Terunuma ,  Tomoaki Shimizu

IPC分类号： G11B5/33 ,  G11B5/39

CPC分类号： G11B5/3932 ,  B82Y25/00 ,  G01R33/093 ,  G01R33/098 ,  Y10T428/1107 ,  Y10T428/1121

摘要： A pair of domain control layers are disposed on both sides of the track width direction of the MR film so as to be separated from each other such that the MR film is held therebetween, and apply a longitudinal magnetic field to the MR film (free layer). The MR film is flanked by the domain control layers, each including a layer structure constituted by a base layer, a ferromagnetic layer, and a hard magnetic layer. The base layer causes the hard magnetic layer to have a magnetization direction aligning with an in-plane direction, so as to enhance the coercive force of the hard magnetic layer.

摘要翻译： 一对域控制层设置在MR膜的轨道宽度方向的两侧，以便彼此分离，使得MR膜保持在它们之间，并将纵向磁场施加到MR膜（自由层 ）。 MR膜侧面是域控制层，每个层包括由基层，铁磁层和硬磁性层构成的层结构。 基层使得硬磁性层具有与面内方向对准的磁化方向，以增强硬磁性层的矫顽力。

公开(公告)号：US07136263B2

公开(公告)日：2006-11-14

申请号：US10727551

申请日：2003-12-05

申请人： Kosuke Tanaka ,  Koji Shimazawa ,  Koichi Terunuma

发明人： Kosuke Tanaka ,  Koji Shimazawa ,  Koichi Terunuma

IPC分类号： G11B5/127

CPC分类号： G11B5/3906 ,  Y10T29/49052

摘要： A thin-film magnetic head comprises a magnetoresistive film, a pair of magnetic domain control layers for applying a bias magnetic field to the magnetoresistive film, a pair of electrode layers for supplying a current to the magnetoresistive film, first and second shield layers for shielding the magnetoresistive film, a first insulating layer disposed between the magnetoresistive film and magnetic domain control layer and the first shield layer, and a second insulating layer disposed between the magnetoresistive film and electrode layer and the second shield layer. The shield layers have a distance therebetween shorter at a position where the electrode layer and magnetic domain control layer are laminated than that at a position where the magnetoresistive film is located. While the surface of the magnetic domain control layer on the first insulating layer side at the position where the electrode film and magnetic domain control layer are laminated is taken as a reference surface, the distance from the reference surface to the surface of the electrode layer on the second insulating layer side is set shorter than the distance from the reference surface to the surface of the magnetoresistive film on the second insulating layer side.

摘要翻译： 薄膜磁头包括磁阻膜，用于向磁阻膜施加偏置磁场的一对磁畴控制层，用于向磁阻膜提供电流的一对电极层，用于屏蔽的第一和第二屏蔽层 磁阻膜，设置在磁阻膜和磁畴控制层之间的第一绝缘层和第一屏蔽层，以及设置在磁阻膜与电极层和第二屏蔽层之间的第二绝缘层。 在层叠电极层和磁畴控制层的位置上，屏蔽层的距离比在磁阻膜位置处的屏蔽层之间的距离更短。 将层叠有电极膜和磁畴控制层的位置上的第一绝缘层侧的磁畴控制层的表面作为基准面，从基准面到电极层的表面的距离 第二绝缘层侧被设定为比从第二绝缘层侧的磁阻膜的基准面到表面的距离短。

公开(公告)号：US07029770B2

公开(公告)日：2006-04-18

申请号：US10633669

申请日：2003-08-05

申请人： Koji Shimazawa ,  Yoshihiro Tsuchiya ,  Koichi Terunuma

发明人： Koji Shimazawa ,  Yoshihiro Tsuchiya ,  Koichi Terunuma

IPC分类号： G11B5/127

CPC分类号： B32B15/01 ,  B82Y10/00 ,  B82Y25/00 ,  G01R33/093 ,  G11B5/3912 ,  G11B2005/3996 ,  Y10T428/1143 ,  Y10T428/115

摘要： An exchange-coupled film has a ferromagnetic layer sandwich comprising a first ferromagnetic layer containing a ferromagnetic material of the body-centered cubic structure and a pair of second ferromagnetic layers containing a ferromagnetic material of the face-centered cubic structure and formed on respective sides of the first ferromagnetic layer; and an antiferromagnetic layer containing a disordered alloy and formed on one of the second ferromagnetic layers. It yields sufficient exchange coupling energy even in smaller thickness of the antiferromagnetic layer than before, whereby it becomes feasible to decrease the thickness of the exchange-coupled film.

摘要翻译： 交换耦合膜具有铁磁层三明治，其包含含有体心立方结构的铁磁材料的第一铁磁层和包含面心立方结构的铁磁材料的一对第二铁磁层，并形成在 第一铁磁层; 以及含有无序合金并形成在第二铁磁层之一上的反铁磁层。 即使在比以前更小的反铁磁性层的厚度中也产生充分的交换耦合能力，从而可以减小交换膜的厚度。

公开(公告)号：US20060007604A1

公开(公告)日：2006-01-12

申请号：US11227126

申请日：2005-09-16

申请人： Koichi Terunuma ,  Koji Shimazawa ,  Akifumi Kamijima

发明人： Koichi Terunuma ,  Koji Shimazawa ,  Akifumi Kamijima

IPC分类号： G11B5/127 ,  G11B5/33

CPC分类号： G11B5/3903 ,  G11B5/3932 ,  G11B5/3967 ,  Y10T29/49046

摘要： A magnetoresistive effective film responds commensurate with an external magnetic field. Magnetic domain-controlling films apply a perpendicular biasing magnetic field to the magnetoresistive effective film. The forefronts of first electrode films constituting a pair of electrode films are overlaid on the magnetoresistive effective film, and the forefront surfaces of the first electrode films are risen at an inner angle of θ1. Second electrode films are overlaid on the first electrode films, and the forefront surfaces of the second electrode films are risen at an inner angle of θ2 smaller than the inner angle θ1.

公开(公告)号：US07193822B2

公开(公告)日：2007-03-20

申请号：US10861472

申请日：2004-06-07

申请人： Tomoaki Shimizu ,  Koji Shimazawa ,  Kosuke Tanaka ,  Koichi Terunuma

发明人： Tomoaki Shimizu ,  Koji Shimazawa ,  Kosuke Tanaka ,  Koichi Terunuma

IPC分类号： G11B5/127

CPC分类号： B82Y25/00 ,  B82Y10/00 ,  G11B5/3906 ,  G11B5/3909 ,  G11B2005/0016

摘要： At both end portions of at least a soft magnetic layer of a magneto-resistive effect film, a pair of bias magnetic field applying layers are disposed for applying a longitudinal bias magnetic field to the soft magnetic layer via magnetic underlayers. Further, mutual lattice point-to-point distances in the plane where each magnetic underlayer and the corresponding bias magnetic field applying layer are mated, are substantially equalized to each other. Therefore, a coercive force Hc in an in-plane direction (direction parallel to a film surface) of each bias magnetic field applying layer can be maintained at a high level so that even when further gap narrowing or track narrowing is aimed, the bias magnetic field applying layers can act to apply an effective bias magnetic field, i.e. can act to suppress occurrence of the Barkhausen noise.

摘要翻译： 在磁阻效应膜的至少软磁性层的两端部，设置一对偏置磁场施加层，用于经由磁性底层向软磁性层施加纵向偏置磁场。 此外，每个磁性底层和相应的偏置磁场施加层配合的平面中的相互点阵点对点距离基本上相等。 因此，可以将每个偏磁场施加层的面内方向（平行于膜表面的方向）的矫顽力Hc保持在高水平，使得即使当进一步进行间隙变窄或轨道变窄时，偏磁 场施加层可以起作用以施加有效偏置磁场，即可以起到抑制巴克豪森噪声的发生的作用。