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    Low noise magnetic head for high frequency recording
    2.
    发明授权
    Low noise magnetic head for high frequency recording 失效
    低噪音磁头用于高频录音

    公开(公告)号：US5792547A

    公开(公告)日：1998-08-11

    申请号：US607130

    申请日：1996-02-26

    Applicant: Francis H. Liu ,  Minshen Tan ,  Hua-Ching Tong

    Inventor： Francis H. Liu ,  Minshen Tan ,  Hua-Ching Tong

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

    CPC classification number: B82Y25/00 ,  G11B5/3113 ,  G11B5/3903 ,  G11B5/3925 ,  H01F10/3218 ,  G11B5/3163 ,  Y10S428/90 ,  Y10T428/1186 ,  Y10T428/24942

    Abstract: A laminated pole structure for use in a low noise magnetic head suitable for high frequency signal operation is formed by interleaving a plurality of ferromagnetic layers and electrically insulating antiferromagnetic layers so as to form interface surfaces therebetween. External magnetic fields are applied as the interface surfaces are being formed for establishing exchange anisotropies with predetermined permanent exchange pinning directions in the ferromagnetic layers. The exchange anisotropies may be in the same or opposite directions, as defined by the external magnetic fields. In one embodiment, the pole structure has an open edge lamination, while in another embodiment the pole structure has a closed edge lamination. In still another embodiment, the antiferromagnetic layers include predetermined patterns of nonmagnetic material.

    Abstract translation: 用于适用于高频信号操作的低噪声磁头中的层叠极结构是通过交错多个铁磁层和电绝缘反铁磁层形成的，以便在它们之间形成界面。 当形成界面表面以在铁磁层中建立具有预定永久交换钉扎方向的交换各向异性时，施加外部磁场。 交换各向异性可以是与外部磁场所定义的相同或相反的方向。 在一个实施例中，极结构具有开口边缘层叠，而在另一实施例中，极结构具有封闭边缘层叠。 在另一个实施例中，反铁磁层包括非磁性材料的预定图案。

    Method of forming a thin film magnetic structure having ferromagnetic and antiferromagnetic layers
    3.
    发明授权
    Method of forming a thin film magnetic structure having ferromagnetic and antiferromagnetic layers 失效
    形成具有铁磁性和反铁磁性层的薄膜磁性结构的方法

    公开(公告)号：US5612098A

    公开(公告)日：1997-03-18

    申请号：US696656

    申请日：1996-08-14

    Applicant: Minshen Tan ,  Hua-Ching Tong ,  Francis H. Liu ,  Swie-In Tan

    Inventor： Minshen Tan ,  Hua-Ching Tong ,  Francis H. Liu ,  Swie-In Tan

    IPC: C23C14/35 ,  G01R33/09 ,  G11B5/31 ,  G11B5/39 ,  H01F10/32 ,  H01F41/30 ,  C23C14/08

    CPC classification number: B82Y25/00 ,  B82Y40/00 ,  C23C14/351 ,  G01R33/093 ,  G11B5/3109 ,  G11B5/3113 ,  G11B5/3903 ,  G11B5/3948 ,  H01F10/3218 ,  H01F10/3254 ,  H01F41/302 ,  Y10T428/265

    Abstract: A method of forming a magnetic structure having layers with different magnetization orientations provided by a common magnetic bias layer includes the steps of depositing an antiferromagnetic layer between first and second ferromagnetic layers. During the deposition of the first and second ferromagnetic layers, magnetization fields of different orientations are employed separately to induce different directions of magnetization in the first and second layers. The different directions of magnetization in the first and second layers are sustained, through the process of exchange coupling, by the interposed antiferromagnetic layer which serves as the bias layer. A magnetic structure thus fabricated, can be used as a read transducer capable of generating differential signals with common mode noise rejection, and can be used as a magnetic pole for a magnetic head with reduced Barkhausen noise.

    Abstract translation: 形成具有由公共偏磁层提供的具有不同磁化取向的层的磁性结构的方法包括以下步骤：在第一和第二铁磁层之间沉积反铁磁性层。 在沉积第一和第二铁磁层期间，分别采用不同取向的磁化场以在第一和第二层中引起不同的磁化方向。 通过交换耦合的过程，通过用作偏置层的插入的反铁磁层来维持第一和第二层中不同的磁化方向。 如此制造的磁结构可以用作能够产生具有共模噪声抑制的差分信号的读取传感器，并且可以用作具有降低的巴克豪森噪声的磁头的磁极。

    Magnetoresistive transducer having a common magnetic bias using assertive and complementary signals
    4.
    发明授权
    Magnetoresistive transducer having a common magnetic bias using assertive and complementary signals 失效
    具有使用断言和互补信号的公共磁偏置的磁阻换能器

    公开(公告)号：US06392850B1

    公开(公告)日：2002-05-21

    申请号：US09651053

    申请日：1998-10-19

    Applicant: Hua-Ching Tong ,  Francis H. Liu ,  Minshen Tan ,  Robert Earl Rottmayer ,  Jian-Gang Zhu ,  Samuel W. Yuan

    Inventor： Hua-Ching Tong ,  Francis H. Liu ,  Minshen Tan ,  Robert Earl Rottmayer ,  Jian-Gang Zhu ,  Samuel W. Yuan

    IPC: G11B539

    CPC classification number: B82Y25/00 ,  B82Y10/00 ,  G01R33/093 ,  G01R33/096 ,  G11B5/3954 ,  G11B2005/3996

    Abstract: Magnetic transducers are formed with common magnetic exchange layers capable of providing assertive and complementary signals. The transducers include an assertive transducer portion and a complementary transducer portion. Between the two transducer portions is a common bias portion which comprises an antiferromagnetic layer providing bias fields in different directions to the respective transducer portions. During normal operations, a current is directed into each of the transducer portions. The assertive transducer portion, being magnetically biased in one direction, generates a varying voltage as an assertive version of the electrical signal. The complementary transducer, being magnetically biased in another direction, generates another varying voltage as a complementary version of the electrical signal. In one embodiment, the transducer portions are implemented to operate as an anisotropic MR(AMR) sensor. In a second embodiment, the transducer portions operate as a giant MR(GMR) or spin valve sensor.

    Abstract translation: 磁传感器形成有能够提供断言和互补信号的公共磁交换层。 换能器包括断言换能器部分和互补换能器部分。 在两个换能器部分之间是公共偏置部分，其包括反铁磁层，其向相应的换能器部分提供不同方向的偏置场。 在正常操作期间，电流被引导到每个换能器部分中。 在一个方向上被磁偏置的断言换能器部分产生变化的电压作为电信号的断言版本。 互补传感器在另一个方向上被磁偏置，产生另一个变化的电压作为电信号的互补版本。 在一个实施例中，传感器部分被实现为用作各向异性MR（AMR）传感器。 在第二实施例中，换能器部分作为巨型MR（GMR）或自旋阀传感器工作。

    Thin film magnetic structure having ferromagnetic and antiferromagnetic layers
    5.
    发明授权
    Thin film magnetic structure having ferromagnetic and antiferromagnetic layers 失效
    具有铁磁性和反铁磁性层的薄膜磁性结构

    公开(公告)号：US5876848A

    公开(公告)日：1999-03-02

    申请号：US794765

    申请日：1997-02-03

    Applicant: Minshen Tan ,  Hua-Ching Tong ,  Francis H. Liu ,  Swie-In Tan

    Inventor： Minshen Tan ,  Hua-Ching Tong ,  Francis H. Liu ,  Swie-In Tan

    IPC: C23C14/35 ,  G01R33/09 ,  G11B5/31 ,  G11B5/39 ,  H01F10/32 ,  H01F41/30 ,  B05D5/12

    CPC classification number: B82Y25/00 ,  B82Y40/00 ,  C23C14/351 ,  G01R33/093 ,  G11B5/3109 ,  G11B5/3113 ,  G11B5/3903 ,  G11B5/3948 ,  H01F10/3218 ,  H01F10/3254 ,  H01F41/302 ,  Y10T428/265

    Abstract: A method of forming a magnetic structure having layers with different magnetization orientations provided by a common magnetic bias layer includes the steps of depositing an antiferromagnetic layer between first and second ferromagnetic layers. During the deposition of the first and second ferromagnetic layers, magnetization fields of different orientations are employed separately to induce different directions of magnetization in the first and second layers. The different directions of magnetization in the first and second layers are sustained, through the process of exchange coupling, by the interposed antiferromagnetic layer which serves as the bias layer. A magnetic structure thus fabricated, can be used as a read transducer capable of generating differential signals with common mode noise rejection, and can be used as a magnetic pole for a magnetic head with reduced Barkhausen noise.

    Abstract translation: 形成具有由公共偏磁层提供的具有不同磁化取向的层的磁性结构的方法包括以下步骤：在第一和第二铁磁层之间沉积反铁磁性层。 在沉积第一和第二铁磁层期间，分别采用不同取向的磁化场以在第一和第二层中引起不同的磁化方向。 通过交换耦合的过程，通过用作偏置层的插入的反铁磁层来维持第一和第二层中不同的磁化方向。 如此制造的磁结构可以用作能够产生具有共模噪声抑制的差分信号的读取传感器，并且可以用作具有降低的巴克豪森噪声的磁头的磁极。

    Method of producing exchange coupled magnetic thin films with post-deposition annealing
    7.
    发明授权
    Method of producing exchange coupled magnetic thin films with post-deposition annealing 失效
    具有后沉积退火的交换耦合磁性薄膜的制备方法

    公开(公告)号：US5529814A

    公开(公告)日：1996-06-25

    申请号：US547694

    申请日：1995-10-19

    Applicant: Minshen Tan ,  Hua-Ching Tong ,  Swie-In Tan

    Inventor： Minshen Tan ,  Hua-Ching Tong ,  Swie-In Tan

    IPC: G11B5/66 ,  G11B5/84 ,  B05D1/02

    CPC classification number: G11B5/66 ,  G11B5/84

    Abstract: Exchange coupled magnetic thin films are produced by depositing an antiferromagnetic layer, followed by deposition of a layer of ferromagnetic material on the antiferromagnetic layer. The composite antiferromagnetic/ferromagnetic structure is then annealed at an elevated temperature for a predetermined length of time. This process results in considerably higher exchange coupling fields than obtainable before. Alternatively, the antiferromagnetic layer may be annealed prior to deposition of the ferromagnetic layer.

    Abstract translation: 交换耦合的磁性薄膜是通过沉积反铁磁性层，随后在反铁磁性层上沉积一层铁磁材料制成的。 然后将复合反铁磁/铁磁结构在升高的温度下退火预定的时间长度。 该过程导致比以前可获得的交换耦合场相当高的交换耦合场。 或者，反铁磁层可以在沉积铁磁层之前退火。

    Thin film magnetic head with trimmed pole tips etched by focused ion beam for undershoot reduction
    10.
    发明授权
    Thin film magnetic head with trimmed pole tips etched by focused ion beam for undershoot reduction 失效
    薄膜磁头，具有通过聚焦离子束蚀刻的修剪极尖，用于下冲

    公开(公告)号：US5726841A

    公开(公告)日：1998-03-10

    申请号：US661749

    申请日：1996-06-11

    Applicant: Hua-Ching Tong ,  Francis H. Liu ,  Samuel W. Yuan ,  Vernon M. Riedlin, Jr. ,  Pradeep K. Thayamballi

    Inventor： Hua-Ching Tong ,  Francis H. Liu ,  Samuel W. Yuan ,  Vernon M. Riedlin, Jr. ,  Pradeep K. Thayamballi

    IPC: G11B5/31 ,  G11B5/39 ,  G11B5/187

    CPC classification number: G11B5/3967 ,  G11B5/3116 ,  G11B5/3163

    Abstract: An air bearing magnetic head is formed with a trimmed head pole tip that includes first and second poles having first and second surfaces respectively, which are coplanar with the air bearing surface of the magnetic head. A pair of leading and trailing bevel surfaces are angularly formed with respect to the first and second surfaces respectively. The bevel surfaces retract portions of the head pole tip away from the surface of a storage medium, and render the head pole tip less sensitive to stray flux, resulting in readback data signals being practically free of undesirable signal undershoots and overshoots. In addition, a minute amount of pole material of the first and second surfaces are trimmed away, thereby defining stepped areas with narrow widths in the first and second poles. The stepped areas enable the magnetic head to record data with narrow and well defined track widths.

    Abstract translation: 一个空气轴承磁头形成有一个修剪的磁头极头，它包括分别具有与磁头的空气支承表面共面的第一和第二表面的第一和第二磁极。 一对前后斜面分别相对于第一表面和第二表面成角度地形成。 斜面使头磁极尖端的部分远离存储介质的表面，并使磁头极尖对杂散磁通较不敏感，导致回读数据信号实际上没有不期望的信号下冲和过冲。 此外，第一和第二表面的极材料的微小量被修剪掉，从而在第一和第二极中限定具有窄宽度的台阶区域。 台阶区域使得磁头能够以窄且良好的轨道宽度记录数据。

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