公开(公告)号：US5436777A

公开(公告)日：1995-07-25

申请号：US941248

申请日：1992-09-04

Applicant: Susumu Soeya ,  Shigeru Tadokoro ,  Takao Imagawa ,  Eiji Ashida ,  Moriaki Fuyama ,  Shinji Narishige ,  Kouichi Nishioka

Inventor： Susumu Soeya ,  Shigeru Tadokoro ,  Takao Imagawa ,  Eiji Ashida ,  Moriaki Fuyama ,  Shinji Narishige ,  Kouichi Nishioka

IPC: G11B5/00 ,  G11B5/012 ,  G11B5/31 ,  G11B5/39

CPC classification number: G11B5/3932 ,  G11B5/012 ,  G11B5/3903 ,  G11B5/398 ,  G11B5/399 ,  G11B2005/0016 ,  G11B5/3113 ,  G11B5/313

Abstract: A magnetoresistive head has a substrate (1) and, on the substrate, a magnetoresistive film (40) for converting a magnetic signal into an electric signal by using magnetoresistance effects and a pair of electrodes (60) for causing a signal detection current to flow through the magnetoresistive film. A pair of first domain wall suppressing layers (30) are arranged at opposite end portions of the magnetoresistive film, respectively, to apply a longitudinal magnetic bias to the magnetoresistive film. A second domain wall suppressing layer (45) is also provided for applying a longitudinal magnetic bias, which is weaker compared with the longitudinal magnetic bias applied by the first domain wall suppressing layers, to the magnetoresistive film (40).

Abstract translation: 磁阻头具有衬底（1），并且在衬底上具有用于通过使用磁阻效应将磁信号转换为电信号的磁阻膜（40）和用于使信号检测电流流动的一对电极（60） 通过磁阻膜。 一对第一畴壁抑制层（30）分别布置在磁阻膜的相对端部，以将纵向磁偏压施加到磁阻膜。 还提供了第二畴壁抑制层（45），用于施加与由第一畴壁抑制层施加的纵向磁偏压相比较对磁阻膜（40）较弱的纵向磁偏压。

公开(公告)号：US5428893A

公开(公告)日：1995-07-04

申请号：US145469

申请日：1993-11-04

Applicant: Michael L. Mallary

Inventor： Michael L. Mallary

IPC: G11B5/127 ,  G11B5/17 ,  G11B5/31 ,  G11B5/52

CPC classification number: G11B5/17 ,  G11B5/127 ,  G11B5/31 ,  G11B5/3113 ,  Y10T29/49032 ,  Y10T29/49064

Abstract: A thin film magnetic transducer formed in multiple layers and comprising a yoke having a plurality of arms, at least one of which has segments lying in separate layers and connected through a transition layer, and a multiturn coil intertwined with the yoke to provide at least two flux interactions between the yoke and coil. The transducer is constructed to enhance flux conduction by rotation and minimize flux conduction by wall motion in the yoke.

Abstract translation: 一种形成在多层中的薄膜磁换能器，其包括具有多个臂的磁轭，所述磁轭具有多个臂，所述磁轭中的至少一个具有位于分开的层中并通过过渡层连接的分段，以及与所述磁轭缠绕的多圈线圈，以提供至少两个 轭和线圈之间的磁通相互作用。 传感器被构造为通过旋转来增强磁通传导，并且通过磁轭中的壁运动来最小化磁通传导。

公开(公告)号：US5385637A

公开(公告)日：1995-01-31

申请号：US986252

申请日：1992-12-07

Applicant: Pradeep K. Thayamballi

Inventor： Pradeep K. Thayamballi

IPC: G11B5/31 ,  G11B5/00

CPC classification number: G11B5/3163 ,  G11B5/3113 ,  Y10T29/49034

Abstract: A method and means for reducing readback non-repeatability in thin film heads due to non-repeatablele domain structure, comprising the steps of depositing a layer of antiferromagnetic material, such as MnFe, to create larger uniaxial anisotropy, and localizing such a layer in the upper magnetic pole to improve head performance without sacrificing efficiency. In a particular implementation, alternating layers of NiFe/MnFe/NiFe, each 500 Angstroms thick, are deposited, followed by a sputtered seed layer for subsequent plating. After lapping to correct throat height, the head is then heated above the Neel temperature of MnFe and cooled in the presence of an applied magnetic field.

Abstract translation: 一种用于减少由于不可重复域结构导致的薄膜磁头中的回读不可重复性的方法和装置，其特征在于包括沉积诸如MnFe的反铁磁性材料层以产生更大的单轴各向异性的步骤，以及将这种层定位在 上磁极提高头部性能而不牺牲效率。 在一个具体实施方案中，沉积每500埃厚的NiFe / MnFe / NiFe交替层，随后是溅射种子层用于随后的镀覆。 研磨后，将头部加热到高于NeFe的MnFe温度，并在施加的磁场存在下冷却。

公开(公告)号：US5382301A

公开(公告)日：1995-01-17

申请号：US961395

申请日：1992-10-15

Applicant: Keiji Ohkubo ,  Yuko Arimoto ,  Hiroyuki Uwazumi ,  Hisashi Yamasaki

Inventor： Keiji Ohkubo ,  Yuko Arimoto ,  Hiroyuki Uwazumi ,  Hisashi Yamasaki

IPC: G11B5/31 ,  H01F1/153 ,  H01F41/22

CPC classification number: G11B5/3113 ,  G11B5/3163 ,  H01F1/15341 ,  Y10T29/49034

Abstract: A thin-film magnetic head is disclosed that includes a lower magnetic core and an upper magnet core formed on the surface of a substrate and connected together at a first end thereof, a magnetic gap is formed between the lower and upper magnetic cores at a second end thereof, and a coil-form electric conductive layer is located between the lower magnetic core and the upper magnet core. The lower and upper magnetic cores have a saturated magnetic flux density from 10,000 G to 18,000 G, while the magnetic permeability along the magnetic path of the magnetic head is 3,000 or higher at a frequency of 10 MHz. The unique characteristics of the magnetic head are obtained by heating an arrangement comprising the lower and upper magnetic cores, the magnetic gap layer, and the electric conductive layer to a temperature above 325.degree. C., and applying an external magnetic field greater than 0.01 kOe to the lower and upper magnetic cores to relax their magnetic anisotropy as the lower and upper magnetic cores are cooled during the manufacturing process.

Abstract translation: 公开了一种薄膜磁头，其包括形成在基板的表面上的下磁芯和上磁芯，并在其第一端连接在一起，在下磁芯和上磁芯之间形成磁隙，第二 并且线圈形导电层位于下磁芯和上磁心之间。 下磁芯和上磁芯具有10,000G至18,000G的饱和磁通密度，而磁头的磁路的磁导率在10MHz的频率下为3,000或更高。 通过将包括下磁芯和上磁芯，磁隙层和导电层的装置加热到高于325℃的温度，并施加大于0.01kOe的外部磁场，获得磁头的独特特性 到下磁芯和上磁芯，以在制造过程中随着下磁芯和上磁芯的冷却而松弛其磁各向异性。

公开(公告)号：US5269895A

公开(公告)日：1993-12-14

申请号：US801241

申请日：1991-12-03

Applicant: Paul F. Michalek ,  John Kirchberg ,  John A. Rice

Inventor： Paul F. Michalek ,  John Kirchberg ,  John A. Rice

IPC: G11B5/31 ,  G11B5/39 ,  H01F10/28 ,  H01F10/30 ,  C23C14/34 ,  G11B5/127

CPC classification number: G11B5/3925 ,  G11B5/3103 ,  G11B5/3113 ,  G11B5/3163 ,  G11B5/3967 ,  H01F10/28 ,  H01F10/30

Abstract: A surface smooth enough to allow the formation thereon of a single domain magnetic element is obtained by covering a polished layer with a thin layer of the same material, to smooth sharp edges and corners. The resulting structure is useful in thin film magnetic heads.

Abstract translation: 通过用相同材料的薄层覆盖抛光层来获得平滑足以允许其形成单畴磁性元件的表面，以平滑锋利的边缘和拐角。 所得到的结构在薄膜磁头中是有用的。

公开(公告)号：US5214840A

公开(公告)日：1993-06-01

申请号：US550698

申请日：1990-07-10

Applicant: Takao Imagawa ,  Masaaki Sano ,  Katsuya Mitsuoka ,  Kouichi Nishioka ,  Shinji Narishige ,  Tetsuo Kobayashi

Inventor： Takao Imagawa ,  Masaaki Sano ,  Katsuya Mitsuoka ,  Kouichi Nishioka ,  Shinji Narishige ,  Tetsuo Kobayashi

IPC: G11B5/31

CPC classification number: G11B5/3163 ,  G11B5/3113 ,  Y10T29/49034

Abstract: A method of fabricating a thin film magnetic head including a bottom magnetic core formed on a substrate, a top magnetic core laminated through an insulation layer, with one end of the top and bottom magnetic cores being joined and another end forming a magnetic gap, and a conductor coil layer which winds around the joined section for a plurality of number of turns. At least one of the top and bottom magnetic cores has its magnetization easy axis oriented substantially orthogonal to the magnetic path direction of the magnetic head by the magnetic annealing process, so that the magnetic head has an increased output and an enhanced write ability.

Abstract translation: 一种制造薄膜磁头的方法，该薄膜磁头包括形成在基板上的底部磁芯，通过绝缘层层压的顶部磁芯，顶部和底部磁芯的一端接合，另一端形成磁隙， 导体线圈层绕着连接部分缠绕多个匝数。 顶部和底部磁芯中的至少一个通过磁性退火处理使其磁化容易轴定向为基本上垂直于磁头的磁路方向，从而磁头具有增加的输出和增强的写入能力。

公开(公告)号：US5132859A

公开(公告)日：1992-07-21

申请号：US571944

申请日：1990-08-23

Applicant: Panayotis C. Andricacos ,  Jei-Wei Chang ,  Bojan Petek ,  Lubomyr T. Romankiw

Inventor： Panayotis C. Andricacos ,  Jei-Wei Chang ,  Bojan Petek ,  Lubomyr T. Romankiw

IPC: G11B5/127 ,  G11B5/187 ,  G11B5/31 ,  G11B5/39 ,  H01F10/32

CPC classification number: B82Y25/00 ,  G11B5/3113 ,  G11B5/3153 ,  H01F10/32 ,  H01F10/3281 ,  G11B5/3903 ,  G11B5/3919 ,  Y10S428/928

Abstract: A magnetic thin film structure comprising a first layer of magnetic material having a low anisotropy H.sub.k magnetically coupled to a second layer magnetic material having a high anisotropy H.sub.k and a low coercivity. The laminate provides a dual anisotropy behavior such that the laminate exhibits a high initial permeability at relatively small applied fields during the read operation and a high anisotropy at high applied fields during the write operation. The laminate of the present invention reduces inductive head domain instability produced by the write operation while maintaining high reproducing sensitivity during the read operation. Use of the higher H.sub.k material also reduces the sensitivity of the head performance to variation in process-induced stresses.

公开(公告)号：US5018038A

公开(公告)日：1991-05-21

申请号：US413504

申请日：1989-09-27

Applicant: Kanji Nakanishi

Inventor： Kanji Nakanishi

IPC: G11B5/31

CPC classification number: G11B5/3109 ,  G11B5/3113

Abstract: A thin film magnetic head adapted for recording and/or reproducing signals at a frequency of 1 MHz or higher, in which a soft magnetic film having uniaxial magnetic anisotropy is used as a magnetic pole film material and the direction of the magnetic path of the magnetic circuit of the head is arranged to be substantially orthogonal to the axis of easy magnetization, wherein a magnetic pole film constituting the magnetic path is formed as a lamination of at least two, particularly four soft magnetic films, with an intervening nonmagnetic film between the adjacent soft magnetic films, the length W of the magnetic pole film along the direction of the axis of easy magnetization is 30 .mu.m.ltoreq.W.ltoreq.300 .mu.m, and the uniaxial magnetic anisotropy constant Ku is Ku.ltoreq.300 J/m.sup.3. This provides a relative permeance of at least 1000.

Abstract translation: 一种适用于以1MHz或更高的频率记录和/或再现信号的薄膜磁头，其中使用具有单轴磁各向异性的软磁膜作为磁极膜材料，并且磁性磁路的方向 头部的电路布置成与容易磁化的轴线基本正交，其中构成磁路的磁极膜形成为至少两个，特别是四个软磁膜的叠层，其间具有相邻的非磁性膜之间的中间非磁性膜 软磁性膜，沿着易磁化轴方向的磁极膜的长度W为30μm×W =300μm，单轴磁各向异性常数Ku为Ku <300J / m3。 这提供至少1000的相对渗透。

公开(公告)号：US4764834A

公开(公告)日：1988-08-16

申请号：US9588

申请日：1987-01-29

Applicant: Thomas A. Roscamp ,  Paul D. Frank ,  Gary E. Roberts ,  Allan F. Rice

Inventor： Thomas A. Roscamp ,  Paul D. Frank ,  Gary E. Roberts ,  Allan F. Rice

IPC: G11B5/31 ,  G11B5/147

CPC classification number: G11B5/3143 ,  G11B5/3113

Abstract: A thin film transducer having a substrate, a first and second pole piece formed of a selected magnetic material and terminating in a gap, a coil positioned between the first and second pole pieces and a magnetically conductive layer formed of a material having selected chemical, magnetic and physical properties and having a known magnetic saturation flux density and being positioned contiguous at least one of the first pole piece and second pole piece and rearward of the edges forming the gap to conduct magnetic flux in parallel to the pole pieces and to increase and concentrate the magnetic flux density at the edges of the first and second pole piece defining the gap is shown.

Abstract translation: 一种薄膜换能器，具有基板，由所选择的磁性材料形成并终止于间隙的第一和第二极靴，位于第一和第二极靴之间的线圈和由具有选定的化学磁性材料的材料形成的导电层 并具有已知的磁饱和磁通密度并且被定位为邻接第一极靴和第二极靴中的至少一个并且在形成间隙的边缘的后面，以平行于极靴传导磁通量并增加和集中 示出了限定间隙的第一和第二极靴的边缘处的磁通密度。

公开(公告)号：US4750072A

公开(公告)日：1988-06-07

申请号：US828348

申请日：1986-02-11

Applicant: Masayuki Takagi

Inventor： Masayuki Takagi

IPC: G11B5/31 ,  G11B5/127 ,  G11B5/147 ,  G11B5/187

CPC classification number: G11B5/3163 ,  G11B5/3113

Abstract: A thin-film magnetic head provided with a magnetic thin film having a magnetostrictive characteristic is disclosed in which a central part of magnetic core formed of the magnetic thin film has a positive magnetostriction constants, and side parts of the magnetic core on both sides of the central part have negative magnetostriction constants. Thus, when a stress due to the patterning of the magnetic core varies the magnetic characteristic of the magnetic core, the permeability of the magnetic core becomes high, and the magnetic stability thereof is improved. Accordingly, a signal reproduced by this magnetic head has a high output level, and is low in noise level.

Abstract translation: 公开了一种设置有具有磁致伸缩特性的磁性薄膜的薄膜磁头，其中由磁性薄膜形成的磁芯的中心部分具有正的磁致伸缩常数，并且磁芯的两侧的侧面部分 中心部分具有负磁致伸缩常数。 因此，当由于磁芯的图案化引起的应力改变磁芯的磁特性时，磁芯的磁导率变高，并且其磁稳定性提高。 因此，由该磁头再现的信号具有高输出电平，噪声水平低。