公开(公告)号：US20080096050A1

公开(公告)日：2008-04-24

申请号：US11953906

申请日：2007-12-11

Applicant: Akira KIKITSU ,  Tadashi Kai ,  Junichi Akiyama

Inventor： Akira KIKITSU ,  Tadashi Kai ,  Junichi Akiyama

IPC: G11B5/33

CPC classification number: G11B5/66 ,  B82Y10/00 ,  B82Y25/00 ,  G11B5/00 ,  G11B5/012 ,  G11B5/02 ,  G11B5/1278 ,  G11B5/3916 ,  G11B5/3925 ,  G11B5/488 ,  G11B5/59683 ,  G11B5/743 ,  G11B5/746 ,  G11B5/82 ,  G11B7/00 ,  G11B2005/0002 ,  G11B2005/0005 ,  G11B2005/0021 ,  G11B2005/3996 ,  Y10T428/24942 ,  Y10T428/31

Abstract: A magnetic recording medium capable of alleviating thermal fluctuation and improving the recording density includes a functional layer containing a magnetic material, and a recording layer overlying the functional layer and containing a magnetic material. The recording layer contains a plurality of magnetic grains and a nonmagnetic material existing among the magnetic grains, and the functional layer and the recording layer exert exchange coupling interaction in a direction making a substantially orthogonal relation with each other at room temperature.

Abstract translation: 能够缓和热波动并提高记录密度的磁记录介质包括含有磁性材料的功能层和覆盖功能层并含有磁性材料的记录层。 记录层包含多个磁性颗粒和存在于磁性颗粒之间的非磁性材料，并且功能层和记录层在室温下沿彼此基本上正交关系的方向发挥交换耦合相互作用。

公开(公告)号：US06881495B2

公开(公告)日：2005-04-19

申请号：US10183603

申请日：2002-06-28

Applicant: Akira Kikitsu ,  Tadashi Kai ,  Junichi Akiyama

Inventor： Akira Kikitsu ,  Tadashi Kai ,  Junichi Akiyama

IPC: G11B5/65 ,  G11B5/00 ,  G11B5/012 ,  G11B5/02 ,  G11B5/265 ,  G11B5/39 ,  G11B5/48 ,  G11B5/596 ,  G11B5/64 ,  G11B5/66 ,  G11B5/738 ,  G11B7/00 ,  G11B11/10 ,  H01F10/30 ,  G11B5/73

CPC classification number: G11B5/66 ,  B82Y10/00 ,  B82Y25/00 ,  G11B5/00 ,  G11B5/012 ,  G11B5/02 ,  G11B5/1278 ,  G11B5/3916 ,  G11B5/3925 ,  G11B5/488 ,  G11B5/59683 ,  G11B5/743 ,  G11B5/746 ,  G11B5/82 ,  G11B7/00 ,  G11B2005/0002 ,  G11B2005/0005 ,  G11B2005/0021 ,  G11B2005/3996 ,  Y10T428/24942 ,  Y10T428/31

Abstract: A magnetic recording medium capable of alleviating thermal fluctuation and improving the recording density includes a functional layer (12) containing a magnetic material, and a recording layer (11) overlying the functional layer and containing a magnetic material. The recording layer contains a plurality of magnetic grains (51) and a nonmagnetic material (52) existing among the magnetic grains, and the functional layer and the recording layer exert exchange coupling interaction in a direction making a substantially orthogonal relation with each other at the room temperature.

Abstract translation: 能够减轻热波动并提高记录密度的磁记录介质包括含有磁性材料的功能层（12）和覆盖功能层并含有磁性材料的记录层（11）。 记录层包含存在于磁性颗粒之间的多个磁性颗粒（51）和非磁性材料（52），功能层和记录层在相互之间形成基本正交的方向上发挥交换耦合相互作用 室内温度。

公开(公告)号：US06785100B2

公开(公告)日：2004-08-31

申请号：US09829400

申请日：2001-04-09

Applicant: Masayoshi Hiramoto ,  Nozomu Matsukawa ,  Akihiro Odagawa ,  Kenji Iijima ,  Hiroshi Sakakima

Inventor： Masayoshi Hiramoto ,  Nozomu Matsukawa ,  Akihiro Odagawa ,  Kenji Iijima ,  Hiroshi Sakakima

IPC: G11B539

CPC classification number: B82Y25/00 ,  B82Y10/00 ,  G11B5/012 ,  G11B5/11 ,  G11B5/3903 ,  G11B5/3909 ,  G11B5/3916 ,  G11B5/3925 ,  G11B5/398 ,  G11B5/40 ,  G11B2005/3996

Abstract: The present invention provides a magnetic head having improved characteristics, using a magnetoresistive device in which current flows across the film plane such as a TMR device. In a first magnetic head of the present invention, when the area of a non-magnetic layer is defined as a device cross-section area, and the area of a yoke is defined as a yoke area, viewed along the direction perpendicular to the surface of the substrate over which the yoke and the magnetoresistive device are formed, then the device cross-section area is not less than 30% of the yoke area, so that a resistance increase of the device cross-section area is suppressed. In a second magnetic head of the present invention, a magnetoresistive device is formed on a substrate, and a yoke is provided above a non-magnetic layer constituting the device. In a third magnetic head of the present invention, the free layer of the magnetoresistive device includes at least two magnetic films and at least one non-magnetic film that are laminated alternately, and the thickness of the non-magnetic layer is not less than 2 nm and not more than 10 nm, and magnetostatic coupling is dominant. In a fourth magnetic head of the present invention, a magnetic gap is provided adjacent to the magnetoresistive device and the magnetic films are coupled antiferromagnetically.

Abstract translation: 本发明提供一种具有改进特性的磁头，其使用磁阻装置，其中电流流过诸如TMR装置的膜平面。 在本发明的第一磁头中，当非磁性层的面积被定义为器件横截面积，并且将磁轭的面积定义为磁轭面积时，沿垂直于表面的方向观察 在形成磁轭和磁阻装置的基板上，器件截面积不小于磁轭面积的30％，从而可以抑制器件截面积的电阻增加。 在本发明的第二磁头中，在基板上形成磁阻装置，在构成装置的非磁性层的上方设置磁轭。 在本发明的第三磁头中，磁阻装置的自由层包括至少两个磁性膜和交替层叠的至少一个非磁性膜，非磁性层的厚度不小于2 nm，不大于10nm，静磁耦合为主。 在本发明的第四磁头中，与磁阻装置相邻设置有磁隙，并且磁膜与反铁磁耦合。

公开(公告)号：US06710984B1

公开(公告)日：2004-03-23

申请号：US09668471

申请日：2000-09-25

Applicant: Hiromi Yuasa ,  Yuzo Kamiguchi

Inventor： Hiromi Yuasa ,  Yuzo Kamiguchi

IPC: G11B539

CPC classification number: B82Y25/00 ,  B82Y10/00 ,  G11B5/00 ,  G11B5/3903 ,  G11B5/3909 ,  G11B5/3925 ,  G11B2005/3996 ,  H01F10/3263

Abstract: A magnetoresistance effect element has two ferromagnetic films separated by an interlayer film coupling the magnetization of one ferromagnetic layer in a direction perpendicular to the magnetization direction of the other ferromagnetic film, with an antiferromagnetic layer disposed adjacent to one of the ferromagnetic layers, and a free magnetic layer disposed adjacent to an antiferromagnetic film. The heat treatment for producing in the free layer a simple magnetic domain and the heat treatment for fixing the magnetizations of the ferromagnetic layers are simultaneously carried out. Thereby, because maintaining a difference between the blocking temperature of the antiferromagnetic layer adjacent to the free layer and the blocking temperature of an antiferromagnetic layer adjacent to the pin layer becomes unnecessary, an antiferromagnetic layer having a high exchange coupling magnetic field and a high blocking temperature can be selected. Also, because the allowable range to the dispersion of the exchange coupling magnetic field is widen, thinning of the film of the antiferromagnetic layer can be realized and the magnetoresistance effect element can be suitably applied to a magnetic reproducing head requiring a narrow gap.

Abstract translation: 磁阻效应元件具有由层间膜分离的两个铁磁膜，该层间膜在垂直于另一个铁磁膜的磁化方向的方向上耦合一个铁磁层的磁化，其中反铁磁层与铁磁层之一相邻设置， 邻近反铁磁膜设置的磁性层。 同时进行用于在自由层中制造简单磁畴的热处理和用于固定铁磁层的磁化的热处理。 因此，由于保持与自由层相邻的反铁磁性层的阻挡温度与与引线层相邻的反铁磁性层的阻挡温度之间的差异变得不必要，所以具有高交换耦合磁场和高阻挡温度的反铁磁层 可以选择。 此外，由于交换耦合磁场的分散的容许范围变宽，因此可以实现反铁磁层的薄膜的薄化，并且可以将磁阻效应元件适用于需要窄间隙的磁性再现头。

公开(公告)号：US06665143B2

公开(公告)日：2003-12-16

申请号：US09810187

申请日：2001-03-19

Applicant: Hiroaki Yoda ,  Yuichi Osawa ,  Tomomi Funayama

Inventor： Hiroaki Yoda ,  Yuichi Osawa ,  Tomomi Funayama

IPC: G11B5127

CPC classification number: G11B5/3925 ,  G11B5/00 ,  G11B5/127 ,  G11B5/1278 ,  G11B5/3116 ,  G11B2005/0002 ,  G11B2005/0021 ,  Y10T29/49039 ,  Y10T29/49043 ,  Y10T29/49044 ,  Y10T29/49046 ,  Y10T29/49055 ,  Y10T29/49067

Abstract: There is provided a magnetic head capable of efficiently carrying out a recording or reproducing operation even in the case of a shorter magnetic path length and a shorter wavelength signal. The magnetic head comprises: a pair of magnetic bodies including respective first and second medium facing surfaces, respective first and second rear surfaces opposite to the medium facing surfaces, and respective inner side surfaces, the inner side surfaces facing each other; and a magnetic gap disposed between the inner side surfaces and including third medium facing surface coplanar with the first and the second medium facing surfaces and third rear surface coplanar with the first and second rear surfaces; one of the inner side surfaces satisfying relationships of x=G1 /2 with respect to 0≦y≦TH, and 0.1·tan{2(x−G1 /2)}+TH≦y≦5·tan(2(x−G1/2))+TH with respect to TH≦y where x represents X-coordinate of the one of the inner side surfaces and y represents Y-coordinate of the one of the inner side surfaces, the X-axis extends from a center of the third medium facing surface toward a center of the first or the second medium facing surface, the Y-axis extends from the center of the third medium facing surface toward the third rear surface, the Y-axis is substantially perpendicular to the X-axis, and G1 and TH respectively represent constants.

Abstract translation: 即使在较短的磁路长度和较短的波长信号的情况下，也能够有效地执行记录或重放操作的磁头。 磁头包括：一对磁体，包括相应的第一和第二介质面对表面，与介质相对表面相对的相应的第一和第二后表面，以及相应的内侧表面，内侧表面彼此相对; 以及设置在所述内侧表面之间并且包括与所述第一和第二介质相对表面共面的第三介质面对表面和与所述第一和第二后表面共面的第三后表面的磁隙; 内侧表面满足关系的其中一个表示内侧表面之一的X坐标，y表示内侧表面之一的Y坐标，X轴从第三介质的中心朝向 面朝向第一或第二介质面向表面的中心，Y轴从第三介质相对表面的中心朝向第三后表面延伸，Y轴基本上垂直于X轴，并且G1和 TH分别表示常数。

公开(公告)号：US20030162344A1

公开(公告)日：2003-08-28

申请号：US10181759

申请日：2003-02-19

Inventor： Satoru Ishii ,  Satoshi Sasaki

IPC: H01L021/8238

CPC classification number: B82Y25/00 ,  B82Y10/00 ,  B82Y40/00 ,  G01R33/093 ,  G11B5/3116 ,  G11B5/3163 ,  G11B5/3903 ,  G11B5/3909 ,  G11B5/3916 ,  G11B5/3925 ,  G11B5/3967 ,  G11B2005/3996 ,  H01F10/3268 ,  H01F41/302 ,  H01F41/308 ,  H01L43/12

Abstract: There is provided an MR manufacturing method comprising a film-forming process for forming a multilayer film including at least an antiferromagnetic layer 4, a fixed layer 3 and a spacer layer 5, a first patterning process for patterning the multilayer film after a predetermined pattern, a filing process for filling up the circumference of the patterned multilayer film, with an insulating layer 13 a process for forming a magnetic flux guide layer or a free layer also acting as the magnetic flux guide layer over this insulating layer 13 and the patterned multilayer film and a second patterning process by beam etching for simultaneously patterning the magnetic flux guide layer and the above-mentioned multilayer film to form the above-mentioned multilayer structure portion, wherein an incident angle of the etching beam are selected so that an angle null of an etching surface relative to a normal is selected in a range of from 10nullnullnullnull40null, preferably, 15nullnullnullnull35null. Thus, etch rates of the materials composing the multilayer structure portion and materials compoising the insulating layer become nearly equal, whereby etchings at the respective portions can be achieved satisfactorily with high accuracy. As a result, characteristics of the magneto-resistive effect element and the magneto-resistive effect type magnetic head can be stabilized, and the yield thereof can be improved.

Abstract translation: 提供一种MR制造方法，其包括用于形成至少包含反铁磁层4，固定层3和间隔层5的多层膜的成膜工艺，用于在预定图案之后图案化多层膜的第一图案化工艺， 用于填充图案化多层膜的圆周的填充工艺，绝缘层13是用于形成磁导引层或在该绝缘层13上作为磁通引导层的自由层的工艺，以及图案化多层膜 以及通过光束蚀刻进行第二图案化处理，以同时构图磁通引导层和上述多层膜，以形成上述多层结构部分，其中选择蚀刻光束的入射角，使得 蚀刻表面相对于法线的选择范围为10°<= 40°，优选为15°<θ= 35°。 因此，组成多层结构部分的材料和构成绝缘层的材料的蚀刻速率变得几乎相等，由此能够以高精度令人满意地实现各部分的蚀刻。 结果，可以稳定磁阻效应元件和磁阻效应型磁头的特性，并且可以提高其收率。

公开(公告)号：US06606225B1

公开(公告)日：2003-08-12

申请号：US09583575

申请日：2000-05-31

Applicant: Tomomi Funayama ,  Yuichi Osawa ,  Masatoshi Yoshikawa ,  Hiroaki Yoda

Inventor： Tomomi Funayama ,  Yuichi Osawa ,  Masatoshi Yoshikawa ,  Hiroaki Yoda

IPC: G11B5127

CPC classification number: B82Y25/00 ,  B82Y10/00 ,  G11B5/1278 ,  G11B5/3183 ,  G11B5/3903 ,  G11B5/3925 ,  G11B2005/3996

Abstract: The objective of this invention is to provide a yoke-type magnetic head and a magnetic recording device in which Barkhausen noise is low. It is possible to induce a magnetic flux efficiently within a magnetic head by using a granular magnetic film that exhibits both soft magnetic properties and a high resistance, which suppresses any shunt of the flow of the sense current into the magnetic yokes, thus preventing any deterioration insensitivity. Since this means that eddy currents can be suppressed, even during use in high-frequency regions, the frequency response characteristics are also improved. In addition, since the magnetic grains within the granular magnetic film are nano-sized, the dimensions of magnetic domains therein are also miniaturized to match that size, and thus there is also substantially no movement of the magnetic domain walls and this miniaturization also makes it possible to suppress the generation of Barkhausen noise. A similar effect can also be obtained by inducing maze domains within the magnetic yokes.

Abstract translation: 本发明的目的是提供一种轭型磁头和一种其中巴克豪森噪声低的磁记录装置。 通过使用表现出软磁性能和高电阻的粒状磁性膜，能够有效地在磁头内引起磁通，这抑制了磁轭中感应电流流动的任何分流，从而防止任何劣化 不敏感。 由于这意味着即使在高频区域使用时也能够抑制涡流，所以也提高了频率响应特性。 此外，由于粒状磁性膜内的磁性粒子是纳米尺寸的，因此其中的磁畴的尺寸也小型化以与该尺寸相匹配，因此也基本上没有磁畴壁的移动，并且这种小型化也使得它 可能抑制巴克豪森噪音的产生。 通过诱导磁轭内的迷宫结构也可以获得类似的效果。

公开(公告)号：US20030128478A1

公开(公告)日：2003-07-10

申请号：US10041786

申请日：2002-01-07

Applicant: INTERNATIONAL BUSINESS MACHINES

Inventor： Hardayal Singh Gill ,  Savas Gider

IPC: G11B005/39

CPC classification number: G11C11/14 ,  B82Y10/00 ,  B82Y25/00 ,  G11B5/012 ,  G11B5/3903 ,  G11B5/3925 ,  G11B5/3993 ,  G11B2005/3996

Abstract: An extraordinary magnetoresistance (EMR) magnetic head is provided including a first shield and a second shield defining a gap adapted for being positioned over a magnetic recording disk. An EMR sensor is positioned between the first shield and the second shield. In order to ensure proper operation of the EMR sensor, a plane in which the EMR sensor is positioned is perpendicular to magnetic flux associated with the magnetic recording disk.

Abstract translation: 提供非凡的磁阻（EMR）磁头，其包括第一屏蔽和限定适于定位在磁记录盘上的间隙的第二屏蔽。 EMR传感器位于第一屏蔽和第二屏蔽之间。 为了确保EMR传感器的正常工作，EMR传感器所在的平面垂直于与磁记录盘相关联的磁通量。

公开(公告)号：US20030017364A1

公开(公告)日：2003-01-23

申请号：US10183603

申请日：2002-06-28

Applicant: Kabushiki Kaisha Toshiba

Inventor： Akira Kikitsu ,  Tadashi Kai ,  Junichi Akiyama

IPC: B32B019/00

CPC classification number: G11B5/66 ,  B82Y10/00 ,  B82Y25/00 ,  G11B5/00 ,  G11B5/012 ,  G11B5/02 ,  G11B5/1278 ,  G11B5/3916 ,  G11B5/3925 ,  G11B5/488 ,  G11B5/59683 ,  G11B5/743 ,  G11B5/746 ,  G11B5/82 ,  G11B7/00 ,  G11B2005/0002 ,  G11B2005/0005 ,  G11B2005/0021 ,  G11B2005/3996 ,  Y10T428/24942 ,  Y10T428/31

Abstract: A magnetic recording medium capable of alleviating thermal fluctuation and improving the recording density includes a functional layer (12) containing a magnetic material, and a recording layer (11) overlying the functional layer and containing a magnetic material. The recording layer contains a plurality of magnetic grains (51) and a nonmagnetic material (52) existing among the magnetic grains, and the functional layer and the recording layer exert exchange coupling interaction in a direction making a substantially orthogonal relation with each other at the room temperature.

Abstract translation: 能够减轻热波动并提高记录密度的磁记录介质包括含有磁性材料的功能层（12）和覆盖功能层并含有磁性材料的记录层（11）。 记录层包含存在于磁性颗粒之间的多个磁性颗粒（51）和非磁性材料（52），功能层和记录层在相互之间形成基本正交的方向上发挥交换耦合相互作用 室内温度。

公开(公告)号：US06344954B1

公开(公告)日：2002-02-05

申请号：US09517580

申请日：2000-03-02

Applicant: Olivier Redon ,  Koji Shimazawa ,  Noriaki Kasahara ,  Satoru Araki

Inventor： Olivier Redon ,  Koji Shimazawa ,  Noriaki Kasahara ,  Satoru Araki

IPC: G11B539

CPC classification number: B82Y25/00 ,  B82Y10/00 ,  G11B5/3903 ,  G11B5/3909 ,  G11B5/3925 ,  G11B2005/3996

Abstract: The present invention relates to a magneto-resistive tunnel junction head having a tunnel multilayered film composed of a tunnel barrier layer, and a ferromagnetic free layer and a ferromagnetic pinned layer formed to sandwich the tunnel barrier layer therebetween, wherein the ferromagnetic free layer comprises, in an integral fashion, a free layer main portion substantially constituting a part of the tunnel multilayered film, a front flux guide portion extending on a front side of the free layer main portion, and a back flux guide portion extending on a back side thereof, wherein the front flux guide portion constitutes a part of an ABS (Air Bearing Surface), and wherein a width-direction length Lm of the free layer main portion is set greater than a width-direction length Lf of the front flux guide portion and a width-direction length Lb of the back flux guide portion. Thus, there can be provided a magneto-resistive tunnel junction head with improved head performance, in particular, which is excellent in corrosion resistance and can achieve a high and stable head output for adaptation to the ultrahigh density recording using an improved longitudinal bias.

Abstract translation: 本发明涉及一种具有由隧道势垒层构成的隧道多层膜和形成为将隧道势垒层夹在其间的铁磁自由层和铁磁性钉扎层的磁阻隧道结头，其中铁磁自由层包括： 整体地形成基本上构成隧道多层膜的一部分的自由层主体部分，在自由层主体部分的前侧延伸的前部磁通引导部分和在其后侧延伸的后部磁通引导部分， 其特征在于，所述前部磁通导向部构成ABS（空气轴承面）的一部分，其中，所述自由层主体部的宽度方向长度Lm被设定为大于所述前部磁通导向部的宽度方向长度Lf， 后通量引导部的宽度方向长度Lb。 因此，可以提供具有改进的头部性能的磁阻隧道结头，特别是耐腐蚀性优异，并且可以使用改进的纵向偏压来实现用于适应超高密度记录的高稳定的头部输出。