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    THERMALLY ASSISTED MAGNETIC HEAD, METHOD OF MANUFACTURING THE SAME, HEAD GIMBAL ASSEMBLY, AND HARD DISK DRIVE
    75.
    发明申请
    THERMALLY ASSISTED MAGNETIC HEAD, METHOD OF MANUFACTURING THE SAME, HEAD GIMBAL ASSEMBLY, AND HARD DISK DRIVE 有权
    热辅助磁头，其制造方法，头部组件和硬盘驱动

    公开(公告)号：US20150085629A1

    公开(公告)日：2015-03-26

    申请号：US14035015

    申请日：2013-09-24

    Applicant: Yoshitaka SASAKI ,  Hiroyuki ITO ,  Hironori ARAKI ,  Shigeki TANEMURA ,  Kazuki SATO ,  Ryuji FUJII

    Inventor： Yoshitaka SASAKI ,  Hiroyuki ITO ,  Hironori ARAKI ,  Shigeki TANEMURA ,  Kazuki SATO ,  Ryuji FUJII

    IPC: G11B5/48 ,  G11B5/127

    CPC classification number: G11B5/314 ,  G02B6/1226 ,  G11B5/3116 ,  G11B5/3163 ,  G11B2005/0021 ,  Y10T29/49032

    Abstract: A thermally assisted magnetic head includes a main magnetic pole layer, a near-field light generating layer having a generating end part generating near-field light arranged within a medium-opposing surface, and an optical waveguide guiding light to the near-field light generating layer. The near-field light generating layer has a laminated structure in which a first thin-film metal layer formed in a thin film form along a direction intersecting the medium-opposing surface and a second thin-film metal layer formed in a thin film form and formed using a second metal larger in hardness than a first metal forming the first thin-film metal layer are alternately laminated. Further, in the second thin-film metal layer, a defect part is formed, the defect part is a part smaller in thickness than another part or is a hole part, and a flat layer part other than the defect part surrounds the defect part.

    Abstract translation: 一种热辅助磁头包括主磁极层，具有产生在介质相对表面内布置的近场光的产生端部分的近场光产生层和将光引导到近场光产生 层。 近场光产生层具有层叠结构，其中沿着与介质相对表面相交的方向形成薄膜的第一薄膜金属层和形成为薄膜形式的第二薄膜金属层，以及 使用比形成第一薄膜金属层的第一金属硬度大的第二金属交替层压。 此外，在第二薄膜金属层中，形成缺陷部，缺陷部的厚度比另一部分小，也可以是孔部，缺陷部以外的平坦部包围缺损部。

    Touch down detection with HDI sensor DC mode
    77.
    发明授权
    Touch down detection with HDI sensor DC mode 有权
    使用HDI传感器直流模式进行触摸屏检测

    公开(公告)号：US08976481B1

    公开(公告)日：2015-03-10

    申请号：US14182377

    申请日：2014-02-18

    Applicant: SAE Magnetics (H.K.) Ltd. ,  Headway Technologies, Inc.

    Inventor： Qinghua Zeng ,  Ellis Cha ,  Soramany Ka

    IPC: G11B21/02 ,  G11B5/09

    CPC classification number: G11B5/607 ,  G11B5/6076

    Abstract: Methods are provided for determining the heater power level of a dynamic flying height (DFH) type write head at which a touch down (TD) occurs. Each method makes use of the DC component of a head-disk interference (HDI) sensor and the determination of the TD heater energy is deduced from certain characteristics of the function relating heater power to HDI DC signal strength. Characteristics that provide reliable indication of a TD include points of minimum slope, structure of the slope's slope and the properties of a linear fit to the slope if the slope does not converge to a consistent value. It is found that the use of all methods in combination allow a reliable TD determination under virtually all conditions.

    Abstract translation: 提供了用于确定触发（TD）发生的动态飞行高度（DFH）型写入头的加热器功率电平的方法。 每种方法利用头盘干扰（HDI）传感器的直流分量，并从加热器功率与HDI直流信号强度相关的功能的某些特性推导出TD加热器能量的确定。 提供TD的可靠指示的特征包括最小坡度点，坡度斜率的结构以及如果斜率不会收敛到一致的值，则对斜率进行线性拟合的属性。 发现组合使用所有方法可在几乎所有条件下进行可靠的TD测定。

    High data rate writer design
    78.
    发明授权
    High data rate writer design 有权
    高数据率写入器设计

    公开(公告)号：US08929029B2

    公开(公告)日：2015-01-06

    申请号：US13863495

    申请日：2013-04-16

    Applicant: Headway Technologies, Inc.

    Inventor： Tai Min ,  Suping Song ,  Yuhui Tang ,  Lijie Guan

    IPC: G11B5/147

    CPC classification number: G11B5/1278 ,  G11B5/3116 ,  G11B5/315

    Abstract: A magnetic write head is fabricated with its main pole attached to and magnetically coupled to a tapered yoke. The tapered yoke can be a top yoke (on the trailing side of the pole), a bottom yoke (on the leading side of the pole) or a combination of top and bottom configurations. The tapered portion of the yoke is at the distal end of the yoke and it is an extension of an otherwise uniformly thick yoke. It is found that the taper enables the yoke to be close to the ABS for better response times and a high data rate, while simultaneously being distant, producing less field disturbance by the shields and corresponding improvement of BER, and ATE/WATE. A taper of 45° is optimal for its production of uniform magnetization of the pole and optimal response times.

    Abstract translation: 制造磁性写头，其主极附接到磁耦合到锥形轭。 锥形轭可以是顶部磁轭（在磁极的后侧），底部磁轭（在磁极的前导侧）或顶部和底部结构的组合。 轭的锥形部分位于轭的远端，并且是其它均匀厚的轭的延伸部。 已经发现，锥形使轭能够靠近ABS以获得更好的响应时间和高数据速率，同时远程，由屏蔽产生更少的场干扰和相应的BER改善和ATE / WATE。 45°的锥度对于产生极的均匀磁化和最佳响应时间是最佳的。

    MRAM Write Pulses to Dissipate Intermediate State Domains
    79.
    发明申请
    MRAM Write Pulses to Dissipate Intermediate State Domains 有权
    MRAM写脉冲消散中间状态域

    公开(公告)号：US20140347918A1

    公开(公告)日：2014-11-27

    申请号：US13899623

    申请日：2013-05-22

    Applicant: Headway Technologies, Inc.

    Inventor： Yuan-Jen Lee ,  Po-Kang Wang ,  Guenole Jan

    IPC: G11C5/00

    CPC classification number: G11C11/1675 ,  G11C11/00 ,  G11C11/1659 ,  G11C11/1693 ,  G11C29/12015 ,  G11C29/56

    Abstract: A write method for a STT-RAM MTJ is disclosed that substantially reduces the bit error rate caused by intermediate domain states generated during write pulses. The method includes a plurality of “n” write periods or pulses and “n−1” domain dissipation periods where a domain dissipation period separates successive write periods. During each pulse, a write current is applied in a first direction across the MTJ and during each domain dissipation period, a second current with a magnitude equal to or less than the read current is applied in an opposite direction across the MTJ. Alternatively, no current is applied during one or more domain dissipation periods. Each domain dissipation period has a duration of 1 to 10 ns that is equal to or greater than the precession period of free layer magnetization in the absence of spin torque transfer current.

    Abstract translation: 公开了一种用于STT-RAM MTJ的写入方法，其基本上减少了由写入脉冲期间产生的中间域状态引起的误码率。 该方法包括多个“n”个写入周期或脉冲以及“n-1”个域耗散周期，其中域耗散周期分隔连续写入周期。 在每个脉冲期间，跨越MTJ的第一方向施加写入电流，并且在每个域耗散周期期间，跨越MTJ的相反方向施加具有等于或小于读取电流的幅度的第二电流。 或者，在一个或多个域耗散周期期间不施加电流。 每个域耗散周期的持续时间为1到10ns，等于或大于在没有自旋转矩传递电流的情况下自由层磁化的进动周期。

    Non-uniform write gap perpendicular writer for shingle writing
    80.
    发明授权
    Non-uniform write gap perpendicular writer for shingle writing 有权
    用于瓦片写入的非均匀写入间隙垂直写入器

    公开(公告)号：US08896965B2

    公开(公告)日：2014-11-25

    申请号：US14033736

    申请日：2013-09-23

    Applicant: Headway Technologies, Inc.

    Inventor： Lijie Guan

    IPC: G11B5/23 ,  G11B5/31 ,  G11B5/10 ,  G11B5/127

    CPC classification number: G11B5/23 ,  C23C14/06 ,  G11B5/1278 ,  G11B5/3176 ,  G11B5/6082 ,  G11B5/84 ,  G11B5/85 ,  G11B5/851

    Abstract: A PMR writer is disclosed that includes at least one of a recessed center section in the write pole trailing edge and a center recessed trailing shield to improve the field gradient at track edge. In all embodiments, there is a non-uniform write gap between the trailing edge and the trailing shield. The recessed portion of the write pole trailing edge and/or center recess of the trailing shield has a thickness from 10 to 40 nm in a down-track direction and a width in a cross-track direction of 20 to 200 nm. The distance between the center recess and a corner of the trailing edge is from 20 to 80 nm. A sequence of steps is provided to fabricate the two embodiments of the present invention.

    Abstract translation: 公开了一种PMR写入器，其包括写磁极后缘中的凹入中心部分和中心凹陷后屏蔽中的至少一个，以改善磁道边缘处的磁场梯度。 在所有实施例中，在后缘和后屏蔽之间存在不均匀的写入间隙。 后屏蔽的写磁极后缘和/或中心凹部的凹陷部分在下行轨道方向上具有10至40nm的厚度和20至200nm的交叉磁迹方向上的宽度。 中心凹部与后缘的角部之间的距离为20〜80nm。 提供了一系列步骤来制造本发明的两个实施例。

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