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1.发明授权System and method for calibrating and controlling a fly-height actuator in a magnetic recording disk drive 有权用于校准和控制磁记录盘驱动器中的飞高致动器的系统和方法公开(公告)号：US07180692B1
公开(公告)日：2007-02-20
申请号：US11320425
申请日：2005-12-27
CPC分类号： G11B5/6005 , G11B5/3948 , G11B5/6064
摘要： A system and method for calibrating and controlling a magnetic recording disk drive fly-height actuator uses the signal from the magnetoresistive (MR) read head to determine head-disk contact (HDC). The MR signal is measured over a low-frequency range, with the slider out-of-contact with the disk, to develop a reference value. The MR signal is then measured over the same low-frequency range and if it exceeds the reference value by some predetermined amount, this is an indication of HDC. The fly-height actuator control signal value for HDC is recorded and thus corresponds to a head-disk spacing of zero. The calibration method also determines the sensitivity of head-disk spacing to the fly-height actuator control signal by measuring a series of MR read signal amplitudes for a corresponding series of control signals. The fly-height actuator is calibrated from the sensitivity and the value of control signal that results in zero head-disk spacing, and can then be controlled to move the head to a desired fly height and maintain it at the desired fly height.
摘要翻译： 用于校准和控制磁记录盘驱动器飞行高度致动器的系统和方法使用来自磁阻（MR）读取头的信号来确定磁头盘接触（HDC）。 MR信号在低频范围内测量，滑块与磁盘不接触，以产生参考值。 然后在相同的低频范围内测量MR信号，并且如果超过参考值一定的量，则这是HDC的指示。 记录HDC的飞高致动器控制信号值，因此对应于磁头 - 磁盘间距为零。 校准方法还通过测量相应系列控制信号的一系列MR读信号幅度来确定磁头 - 磁盘间距对飞高执行器控制信号的灵敏度。 飞行高度执行器根据灵敏度和控制信号的值进行校准，从而导致零磁头间距，然后可以将磁头移动到所需的飞行高度并将其保持在所需的飞行高度。
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2.发明授权System and method for determining head-disk contact in a magnetic recording disk drive 有权用于确定磁记录盘驱动器中的磁头盘接触的系统和方法公开(公告)号：US07215495B1
公开(公告)日：2007-05-08
申请号：US11320423
申请日：2005-12-27
CPC分类号： G11B5/455 , G11B5/6005 , G11B5/6064 , G11B19/04 , G11B27/36 , G11B2220/2516
摘要： A system and method for determining head-disk contact (HDC) in a magnetic recording disk drive uses the signal from the magnetoresistive (MR) read head. The analog MR signal is digitized and input to a digital signal processor with circuitry and/or software for integrating the signal amplitude over a low-frequency range. The calculated value from the integration when the slider is out-of-contact with the disk is a reference value. The same integration is then performed during operation of the disk drive and the measured value is compared to the reference value. If the measured value exceeds the reference value by some predetermined amount, this is an indication of the onset of HDC or that HDC has occurred. The method can be used in head-disk testers to facilitate the design and testing of disk drive components, such as slider-suspension assemblies and fly-height actuators located on the slider to alter the head-disk spacing, and in disk drives to control fly-height actuators and to take corrective action prior to HDC.
摘要翻译： 用于确定磁记录盘驱动器中的磁头盘接触（HDC）的系统和方法使用来自磁阻（MR）读头的信号。 模拟MR信号被数字化并输入到具有用于在低频范围上积分信号幅度的电路和/或软件的数字信号处理器。 滑块与磁盘脱离接触时的积分计算值是参考值。 然后在磁盘驱动器的操作期间执行相同的积分，并将测量值与参考值进行比较。 如果测量值超过参考值一定预定量，则这是HDC发生或HDC发生的指示。 该方法可用于头盘测试仪，以便于磁盘驱动器组件的设计和测试，例如位于滑块上的滑块悬挂组件和飞高执行器，以改变磁头盘间距，并在磁盘驱动器中进行控制 飞行高度执行器，并在HDC之前采取纠正措施。
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3.发明授权Full track profile derivative method for read and write width measurements of magnetic recording head 失效磁记录头的读和写宽度测量的全磁道轮廓导出方法公开(公告)号：US07119537B2
公开(公告)日：2006-10-10
申请号：US10956950
申请日：2004-09-30
申请人： Xiaodong Che , Terence Tin-Lok Lam , Zhong-heng Lin , Xiaoyu Sui
发明人： Xiaodong Che , Terence Tin-Lok Lam , Zhong-heng Lin , Xiaoyu Sui
CPC分类号： G11B5/4555 , G11B5/012 , G11B5/455 , G11B5/5534 , G11B2005/001 , G11B2005/0016 , G11B2005/3996
摘要： A method for measuring a magnetic read width MRW of a magnetic read sensor directly from the derivative of a full track profile, with better accuracy and more advantages than the micro-track method was invented and also there is no need to use a separate wide write head. The magnetic write width MWW of the write head, without the influence of sensor side reading, can also be obtained by this method along with the MRW with no additional calculations.
摘要翻译： 发明了一种直接从全轨道轮廓的导数测量磁读取传感器的磁读宽度MRW的方法，具有比微轨道方法更好的精度和更多的优点，并且也不需要使用单独的宽写 头。 写入头的磁写入宽度MWW，不受传感器侧读数的影响，也可以通过该方法与MRW一起获得，而不需要额外的计算。
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4.发明授权Method and apparatus for determining the magnetic track width of a magnetic head 失效用于确定磁头的磁道宽度的方法和装置公开(公告)号：US06680609B1
公开(公告)日：2004-01-20
申请号：US10193514
申请日：2002-07-11
IPC分类号： G01R3312
CPC分类号： G11B5/00 , G11B5/012 , G11B5/455 , G11B5/4886 , G11B20/10009 , G11B2005/001 , G11B2005/0016
摘要： A method of determining a magnetic track width of a magnetic head. The method begins by obtaining a full track profile of the magnetic head which includes a plurality of signal amplitudes read across a track of a magnetic disk at a plurality of magnetic head positions. An initial magnetic track width value is then determined from the full track profile data. Preferably, this initial value is the magnetic write width which is determined based on the difference between left and right head positions which read half of the maximum signal amplitude. To determine the final magnetic write width, the initial value is adjusted with side reading correction values. The side reading correction values are determined based on left and right side reading “tails” of a bell-shaped signal curve which is formed by the full track profile data when graphed. It is not necessary to obtain the microtrack profile to determine these side reading values. Off track read capability (OTRC) and erase band width (EBW) values determined by the triple track test can also be corrected.
摘要翻译： 一种确定磁头的磁道宽度的方法。 该方法通过获得磁头的完整轨道轮廓开始，其包括在多个磁头位置处通过磁盘的磁道读取的多个信号幅度。 然后从全轨道轮廓数据确定初始磁道宽度值。 优选地，该初始值是基于读取最大信号幅度的一半的左右头部位置之间的差确定的磁写入宽度。 为了确定最终磁写入宽度，初始值用侧读校正值进行调整。 侧读取校正值基于在绘制时由完整轨道轮廓数据形成的钟形信号曲线的左侧和右侧读取“尾”来确定。 不需要获得微曲线轮廓以确定这些侧读数值。 也可以校正由三轨测试确定的离轨读取能力（OTRC）和擦除带宽（EBW）值。
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5.发明授权Process for measuring nonlinear transition shift (NLTS) at high recording densities with a giant magetoresistive (GMR) head 失效用巨型阻抗（GMR）头在高记录密度下测量非线性过渡位移（NLTS）的过程公开(公告)号：US06788481B2
公开(公告)日：2004-09-07
申请号：US10104422
申请日：2002-03-21
IPC分类号： G11B2736
CPC分类号： B82Y25/00 , B82Y10/00 , G11B5/09 , G11B20/10009 , G11B27/36 , G11B2005/001 , G11B2005/3996 , Y10S977/934
摘要： A nonlinear transition shift (NLTS) measurement procedure for read/write heads employing a giant magnetoresistive (GMR) merged heads. The method of this invention includes the pulse-shape distortion effects on recording nonlinearity, which can significantly affect the existing theoretical formulae for calculating nonlinearity correction factor from measured partial erasure values, and second-order approximation of equation of NLTS and nonlinearity correction factor. Transition broadening effects (TBE) and partial erasure (PE) are incorporated in the NLTS measurement procedure to permit accurate isolation of the NLTS from the unrelated TBE/PE and GMR nonlinear transfer characteristic (NTC). First, a fifth harmonic elimination (5HE) test is performed at bit period T to measure a first nonlinearity value X. Then two partial erasure (PE) tests are done at two different densities, one below the PE threshold to measure a second nonlinearity value XS and the other at the same density as the 5HE test to measure a third nonlinearity value Xh. Finally, the NLTS is computed by combining the first, second and third nonlinearity values.
摘要翻译： 采用巨磁阻（GMR）合并磁头的读/写头的非线性转换偏移（NLTS）测量程序。 本发明的方法包括对记录非线性的脉冲形状失真影响，这可以显着影响现有的用于从测量的部分擦除值计算非线性校正因子的理论公式，以及NLTS和非线性校正因子等式的二阶近似。 过渡拓宽效应（TBE）和部分擦除（PE）被纳入到NLTS测量程序中，以允许NLTS与无关TBE / PE和GMR非线性传递特性（NTC）的精确隔离。 首先，在位周期T执行第五次谐波消除（5HE）测试以测量第一非线性值X.然后，以两个不同的密度进行两次部分擦除（PE）测试，一个低于PE阈值，以测量第二非线性值 XS和另一个与5HE测试相同的密度来测量第三非线性值Xh。 最后，通过组合第一，第二和第三非线性值来计算NLTS。
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公开(公告)号：US06777929B2
公开(公告)日：2004-08-17
申请号：US10229459
申请日：2002-08-27
IPC分类号： G01R3312
CPC分类号： G11B5/012 , G11B5/02 , G11B5/455 , G11B5/4806 , G11B20/24 , G11B27/36 , G11B2005/0016 , G11B2220/20
摘要： A process, computer program product, and apparatus for detecting and quantifying crosstalk instability in a read/write mechanism are provided. A write current is varied in a write circuit for exciting the write head. Measurements are taken of a magnetoresistive impedance of a read current of a read circuit. Measurements are also taken of a signal amplitude in the read circuit. A bit error rate of the overall system is also measured. The read/write mechanism is failed if the signal amplitude changes by a predetermined amount during the varying of the write current. Likewise, the read/write mechanism is failed if the error rate changes by a predetermined amount during the varying of the write current. The write-to-read signal coupling of HGA (Head Gimbal Assembly) and HSA (Head Stack Assembly), including GMR sensor, suspension and flex cable on the actuator arm, can be evaluated at component design level. The methodologies successfully simulate GMR cross talk instability inside a drive on magnetic testers. Therefore, a good prediction of drive failure rate can be achieved.
摘要翻译： 提供了一种用于检测和量化读/写机构中的串扰不稳定性的过程，计算机程序产品和装置。 在用于激励写入头的写入电路中改变写入电流。 测量读取电路的读取电流的磁阻阻抗。 还读取电路中的信号幅度。 还测量了整个系统的误码率。 如果在写入电流的变化期间信号幅度改变预定量，则读/写机构失败。 同样地，如果在写入电流的变化期间错误率改变预定量，则读/写机制失败。 可以在组件设计级别评估HGA（头云台组件）和HSA（磁头堆叠组件）（包括GMR传感器，悬架和柔性电缆）在写臂上的读写信号耦合。 这些方法成功地模拟了磁性测试仪驱动器内的GMR串扰不稳定性。 因此，可以实现对驱动器故障率的良好预测。
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7.发明授权Method and apparatus for providing a write head with an improved pole tip to improve overwrite and/or adjacent track interference 失效用于向写头提供改进的极尖以改善重写和/或相邻轨道干扰的方法和装置公开(公告)号：US08331058B2
公开(公告)日：2012-12-11
申请号：US10857363
申请日：2004-05-28
申请人： Savas Gider , Wen-Chien David Hsiao , Quan-chiu Harry Lam , Terence Tin-Lok Lam , Edward Hin Pong Lee , Yansheng Luo , Vladimir Nikitin , Changqing Shi , Xiaoyu Sui
发明人： Savas Gider , Wen-Chien David Hsiao , Quan-chiu Harry Lam , Terence Tin-Lok Lam , Edward Hin Pong Lee , Yansheng Luo , Vladimir Nikitin , Changqing Shi , Xiaoyu Sui
IPC分类号： G11B5/127
CPC分类号： G11B5/3116
摘要： A method and apparatus for providing a write head with an improved pole tip to improve overwrite and/or adjacent track interference. A cross pole tip writer is provided with a shape that is designed to reduce the saturation on the pole tip and aid in the concentration of flux to the down track.
摘要翻译： 一种用于向写头提供改进的极尖以改善覆盖和/或相邻轨道干扰的方法和装置。 十字极尖端写入器具有被设计成减小极尖上的饱和度的形状，并且有助于向下轨道的通量的集中。
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公开(公告)号：US20090168260A1
公开(公告)日：2009-07-02
申请号：US12005558
申请日：2007-12-26
申请人： Donald G. Allen , Hieu Lam , Terence Tin-Lok Lam , Steve C. Puga
发明人： Donald G. Allen , Hieu Lam , Terence Tin-Lok Lam , Steve C. Puga
IPC分类号： G11B5/33
CPC分类号： G11B5/3153 , G11B5/1278
摘要： Methods and structures for the fabrication of both thin film longitudinal and perpendicular write heads are disclosed. A unique feature of these write heads is the inclusion of layered return poles, which comprise alternating layers of 22/78 and 80/20 NiFe alloys. The alternating layers also vary in thickness, the 22/78 NiFe layers having a nominal thickness of 1500 angstroms and the 80/20 NiFe layers having a nominal thickness of about 75 angstroms. Head efficiency and signal to noise ratios are significantly improved in heads having layered return pole construction.
摘要翻译： 公开了用于制造薄膜纵向和垂直写入头的方法和结构。 这些写头的一个独特之处在于包含层叠的返回极，其包括22/78和80/20 NiFe合金的交替层。 交替层的厚度也变化，22/78 NiFe层的标称厚度为1500埃，而80/20 NiFe层的标称厚度为约75埃。 在具有分层回极结构的头部中，头部效率和信噪比显着提高。
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9.发明授权公开(公告)号：US07889458B2
公开(公告)日：2011-02-15
申请号：US11598418
申请日：2006-11-13
IPC分类号： G11B5/31
CPC分类号： G11B5/1278 , G11B5/187 , G11B2005/0013 , G11B2005/0032
摘要： A magnetic write head having a magnetic cross yoke arranged to provide a cross magnetic field in a pole tip region of the magnetic head. The cross field, which is perpendicular to the magnetization of write pole, reduces the switching time of the write field, thereby increasing the speed with which the write head can record data. The write head can be a longitudinal write head or a perpendicular write head. In the case of a perpendicular write, the write head can include a write pole arranged to provide a magnetic write field that emits a magnetic field substantially perpendicular with an Air Bearing Surface (ABS). A magnetic cross yoke is formed having ends that are disposed at opposite sides of the pole tip region of the write pole.
摘要翻译： 一种磁性写头，具有设置成在磁头的磁极尖端区域中提供交叉磁场的磁性交叉磁轭。 与写入磁极的磁化方向垂直的交叉场减少写入场的切换时间，从而提高写入头可以记录数据的速度。 写头可以是纵向写头或垂直写头。 在垂直写入的情况下，写入头可以包括写极，该写极被布置成提供发射与空气轴承表面（ABS）基本垂直的磁场的磁写入场。 形成磁性交叉轭，其端部设置在写入极的极尖区域的相对侧。
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公开(公告)号：US06477008B1
公开(公告)日：2002-11-05
申请号：US09317668
申请日：1999-05-24
IPC分类号： G11B5115
CPC分类号： G11B5/3103 , G11B5/11 , G11B5/3143 , G11B5/3967
摘要： The present invention is a read/write head for writing information to magnetic media and reading information from magnetic media. It includes a write head element for writing information onto magnetic media, a read head element for reading information from the magnetic media, and an electromagnetic field shield element that is disposed between the write head element and the read head element. The shield functions to shield the read head from electromagnetic field energy created by the write head element. An enhanced second embodiment includes an electrical circuit element that is disposed proximate the read head element that functions to generate an electromagnetic field at the read head element that is generally oppositely directed to the electromagnetic field generated by the write head element to reduce the total electromagnetic field that the read head element is exposed to during a writing operation. The method for operating the read/write head in a hard disk drive, includes the steps of writing data onto a hard disk and reading data from the hard disk simultaneously with the data writing. This is accomplished by shielding the read head from the electromagnetic field energy generated during the data writing by utilizing the electromagnetic field shield element that is disposed between the write head element and the said read head element. The electrical circuit element of the second embodiment is preferably interconnected with the write head electric circuit.
摘要翻译： 本发明是一种用于向磁性介质写入信息并从磁性介质读取信息的读/写头。 它包括用于将信息写入磁介质的写入头元件，用于从磁性介质读取信息的读取头元件以及设置在写入头元件和读取头元件之间的电磁场屏蔽元件。 屏蔽功能用于屏蔽读取头与写入头元件产生的电磁场能量。 增强的第二实施例包括设置在读头元件附近的电路元件，其功能是在读头元件处产生电磁场，该磁头元件通常与写头元件产生的电磁场相反地指向以减小总电磁场 读写头元件在写操作期间被暴露。 用于在硬盘驱动器中操作读/写头的方法包括以下步骤：将数据写入硬盘并且与数据写入同时从硬盘读取数据。 这是通过利用设置在写头元件和所述读头元件之间的电磁场屏蔽元件来屏蔽读头从数据写入期间产生的电磁场能量。 第二实施例的电路元件优选地与写入头电路互连。
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