公开(公告)号：US20040095133A1

公开(公告)日：2004-05-20

申请号：US10298880

申请日：2002-11-18

申请人： International Business Machines Corporation

发明人： Vladimir Nikitin ,  Katalin Pentek

IPC分类号： G01R033/12

CPC分类号： G01Q60/54 ,  G01Q10/06 ,  G01R33/0385 ,  G11B5/012 ,  G11B5/3103 ,  G11B5/3166 ,  G11B5/3173 ,  G11B5/3193 ,  G11B5/3909 ,  G11B5/455 ,  G11B2005/001 ,  G11B2005/0013 ,  G11B2005/0016 ,  G11B2005/3996

摘要： A novel magnetic imaging microscope test system with high spatial (1-10 nm) and temporal (null1 ns) resolution of the magnetic field is disclosed, as well as the system application for characterization of read and write heads for magnetic recording. The test system includes a scanner assembly and a work piece holder for holding a work piece to be tested. The scanner assembly and the work piece holder are positionable relative to each other at very fine resolution during scanning. A probe arm is cantilevered from the scanner assembly to bring a probe head into close proximity to the work piece holder. The probe head is configured scan a work piece in contacting engagement therewith so that a magnetic device on the probe head magnetically interacts with a magnetic field generating or magnetic field sensing device on the work piece. A probe head for use in the test system and a related test method are also disclosed.

摘要翻译： 公开了一种具有高空间（1-10nm）和时间（〜1ns）磁场分辨率的新型磁成像显微镜测试系统，以及用于表征磁记录读写头的系统应用。 测试系统包括扫描器组件和用于保持要测试的工件的工件保持器。 扫描仪组件和工件保持件可以在扫描期间以非常细的分辨率相对于彼此定位。 探头臂从扫描仪组件悬臂，使探针头靠近工件支架。 探针头被配置为扫描与其接触的工件，使得探针头上的磁性装置与工件上的磁场产生或磁场感测装置磁性地相互作用。 还公开了用于测试系统的探头和相关测试方法。

公开(公告)号：US20040090715A1

公开(公告)日：2004-05-13

申请号：US10611623

申请日：2003-06-30

申请人： Hitachi Global Storage Technologies

发明人： Richard Hsiao ,  James D. Jarratt ,  Emo Hilbrand Klaassen ,  Ian Robson McFadyen ,  Timothy J. Moran

IPC分类号： G11B005/39

CPC分类号： B82Y10/00 ,  G11B5/33 ,  G11B5/3967 ,  G11B5/40 ,  G11B5/455 ,  G11B33/10 ,  G11B2005/0013 ,  Y10T29/49032 ,  Y10T29/49036 ,  Y10T29/49039 ,  Y10T29/49043 ,  Y10T29/49044 ,  Y10T29/49071 ,  Y10T29/49073 ,  Y10T29/49078

摘要： A first read gap layer has a resistance RG1 between a first shield layer and one of the first and second lead layers of a read head and the second read gap layer has a resistance RG2 between a second shield layer and said one of the first and second lead layers of the read head. A connection is provided via a plurality of resistors between a first node and each of the first and second shield layers wherein the plurality of resistors includes at least first and second resistors RS1 and RS2 and the first node is connected to said one of the first and second lead layers. A second node is located between the first and second resistors RS1 and RS2. An operational amplifier has first and second inputs connected to the first and second nodes respectively so as to be across the first resistor RS1 and has an output connected to the first node for maintaining the first and second nodes at a common voltage potential. In a first embodiment the first and second shield layers are shorted together. A test instrument is then employed for determining the combined parallel resistance of the resistors RS1 and RS2 by having a first side of the test instrument connected to the first node and the second side connected to each of the first and second shield layers. In the second embodiment a third resistor RS3 is connected between the second node and one of the shield layers, such as the second shield layer. The test instrument can determine the resistances of the first and second gap layers separately by being connected between the first node and the first shield layer for the resistance of the first gap layer or between the first node and the second shield layer for the resistance of the second gap layer.

摘要翻译： 第一读取间隙层在第一屏蔽层和读取头的第一和第二引线层中的一个之间具有电阻RG1，并且第二读取间隙层在第二屏蔽层和第一和第二引线之间的电阻RG2 读头的引导层。 通过第一节点和第一和第二屏蔽层中的每一个之间的多个电阻器提供连接，其中多个电阻器至少包括第一和第二电阻器RS1和RS2，并且第一节点连接到第一和第二屏蔽层 第二铅层。 第二节点位于第一和第二电阻器RS1和RS2之间。 运算放大器具有分别连接到第一和第二节点的第一和第二输入，以跨过第一电阻器RS1并且具有连接到第一节点的输出，用于将第一和第二节点维持在共同的电压电位。 在第一实施例中，第一和第二屏蔽层被短路在一起。 然后通过使测试仪器的第一侧连接到第一节点并且第二侧连接到第一和第二屏蔽层中的每一个，然后采用测试仪器来确定电阻器RS1和RS2的组合并联电阻。 在第二实施例中，第三电阻器RS3连接在第二节点和其中一个屏蔽层之间，例如第二屏蔽层。 测试仪器可以通过连接在第一节点和第一屏蔽层之间来分别确定第一和第二间隙层的电阻，用于第一间隙层的电阻或第一节点和第二屏蔽层之间的电阻， 第二间隙层。

公开(公告)号：US06735034B1

公开(公告)日：2004-05-11

申请号：US09599176

申请日：2000-06-22

申请人： Ashish Manjrekar ,  Echere Iroaga ,  Bryan Bloodworth ,  Paul Merle Emerson

发明人： Ashish Manjrekar ,  Echere Iroaga ,  Bryan Bloodworth ,  Paul Merle Emerson

IPC分类号： G11B1512

CPC分类号： G11B20/10027 ,  G11B5/012 ,  G11B5/02 ,  G11B20/10009 ,  G11B2005/001 ,  G11B2005/0013

摘要： A method and circuit for selectively timing amplifier stages of a multi-stage reader amplifier for a hard disk drive system. The reader amplifier includes a first stage, second stage and third stage coupled in series. The method includes the steps of powering the first stage, delaying the enabling of the second stage, and delaying the enabling of the third stage, in order to reduce excursions on the third stage output signal. The circuit includes a logic circuit for successively enabling the second and third amplifier stages.

摘要翻译： 一种用于选择性地为硬盘驱动器系统的多级读取器放大器的放大器级定时的方法和电路。 阅读器放大器包括串联耦合的第一级，第二级和第三级。 该方法包括以下步骤：对第一级供电，延迟第二级的使能，并延迟第三级的使能，以减少第三级输出信号的偏移。 电路包括用于连续启用第二和第三放大器级的逻辑电路。

公开(公告)号：US20040084528A1

公开(公告)日：2004-05-06

申请号：US10649621

申请日：2003-08-28

发明人： Seiji Moriya ,  Masahiro Yoshii ,  Akihiro Tadamasa ,  Takeshi Horinouchi ,  Gaku Sezaki

IPC分类号： G06K007/08

CPC分类号： G11B5/00808 ,  G06K1/125 ,  G06K17/00 ,  G11B2005/001 ,  G11B2005/0013

摘要： A method and apparatus are disclosed for determining an appropriate write current for a magnetic recording medium and to write magnetic information on the magnetic recording medium at the appropriate write current thus determined. When a current value suited to writing on a magnetic recording medium is to be found, a coercive force of the magnetic recording medium is found from a voltage at which magnetic information written on the magnetic recording medium is read, and a traveling quantity of the magnetic recording medium, and a current value corresponding to the coercive force, are found.

摘要翻译： 公开了一种用于确定磁记录介质的适当写入电流并以这样确定的适当写入电流将磁信息写入磁记录介质的方法和装置。 当要找到适合于在磁记录介质上写入的当前值时，从读取写在磁记录介质上的磁信息的电压和磁记录介质的行进量发现磁记录介质的矫顽力 记录介质和对应于矫顽力的当前值。

公开(公告)号：US20040075927A1

公开(公告)日：2004-04-22

申请号：US10273603

申请日：2002-10-17

申请人： International Business Machines Corporation

发明人： Hardayal Singh Gill

IPC分类号： G11B005/02 ,  G11B005/127

CPC分类号： G11B5/1278 ,  G11B5/187 ,  G11B5/3116 ,  G11B5/313 ,  G11B5/3156 ,  G11B5/3967 ,  G11B5/465 ,  G11B2005/0008 ,  G11B2005/0013

摘要： A single pole perpendicular write head is provided comprising an inductive write head pole structure comprising a layered structure alternating a plurality of ferromagnetic layers with a plurality of antiparallel coupling layers to form an antiparallel coupled ferromagnetic stack. The antiparallel coupling of the ferromagnetic layers when the head is not writing forms a flux closed magnetic configuration of the write pole resulting in reduction or elimination of stray remanence fields at the pole tip region that may cause unwanted data erasure at the disk surface.

摘要翻译： 提供了单极垂直写入头，其包括感应写头磁极结构，其包括层叠结构，交替具有多个反并联耦合层的多个铁磁层以形成反并联耦合的铁磁堆叠。 当磁头不写时，铁磁层的反平行耦合形成写极的通量闭合磁性结构，从而减少或消除磁极尖端区域处的杂散残磁场，这可能导致磁盘表面上的不必要的数据擦除。

公开(公告)号：US06724551B2

公开(公告)日：2004-04-20

申请号：US09895909

申请日：2001-06-29

申请人： Indumini W. Ranmuthu

发明人： Indumini W. Ranmuthu

IPC分类号： G11B2736

CPC分类号： G11B5/40 ,  G11B5/012 ,  G11B2005/0013 ,  G11B2005/0016 ,  G11B2005/0018

摘要： A differential circuit to read differential data from a disk by a current bias on a plurality of read heads includes a read circuit to read the differential data from the disk by maintaining the current bias. The current is below a maximum current of a read head having the lowest maximum voltage of said plurality of read heads.

摘要翻译： 通过多个读取头上的电流偏置从盘读取差分数据的差分电路包括读取电路，以通过维持电流偏压来从盘读取差分数据。 电流低于具有所述多个读取头的最低最大电压的读取头的最大电流。

公开(公告)号：US06717759B1

公开(公告)日：2004-04-06

申请号：US10076592

申请日：2002-02-19

申请人： Genevieve Himle ,  Quinn Haddock ,  Davide Guarisco ,  Erhard Schreck

发明人： Genevieve Himle ,  Quinn Haddock ,  Davide Guarisco ,  Erhard Schreck

IPC分类号： G11B2736

CPC分类号： G11B5/3136 ,  G11B5/012 ,  G11B5/40 ,  G11B27/36 ,  G11B2005/001 ,  G11B2005/0013 ,  G11B2220/20

摘要： A hard disk is provided with tools for limiting the duty cycle (a group of variations of load with time). The write current is controlled by, e.g., limiting the duration of a given write cycle. The write cycle may involve writing data continuously along adjacent portions of the disk media (e.g., writing of data in adjacent segments of a track in the outer diameter (OD) region of a platter), with an intermittent duty write current.

摘要翻译： 硬盘提供了用于限制占空比的工具（一组负载随时间变化）。 写入电流由例如限制给定写周期的持续时间来控制。 写周期可以包括沿着盘介质的相邻部分连续地写入数据（例如，在间隔的占空比写入电流中，在盘的外径（OD）区域中的轨道的相邻段中写入数据）。

公开(公告)号：US06710959B1

公开(公告)日：2004-03-23

申请号：US09512847

申请日：2000-02-25

申请人： Echere Iroaga

发明人： Echere Iroaga

IPC分类号： G11B502

CPC分类号： G11B5/022 ,  G11B5/012 ,  G11B5/02 ,  G11B5/035 ,  G11B5/09 ,  G11B2005/0013

摘要： An adjustable impedance boosting circuit for a magneto-resistive head in a gain stage beyond the input gain stage. The boosting circuit compensates for a frequency pole of the head leads by introducing a zero in proportion to the resistance of the magneto-resistive element and with selectable circuit parameters to further adjust the pole compensation. The invention includes selectively adjusting the sensitivity of the pole compensation to changes in the resistance of the head, selectively adjusting the peak compensation, and adjusting the frequency of the compensating zero.

摘要翻译： 用于增益级超导输入增益级的磁阻头的可调阻抗升压电路。 升压电路通过与磁阻元件的电阻成比例地引入零，并具有可选择的电路参数来进一步调整极点补偿，来补偿磁头引线的频率极点。 本发明包括选择性地调节磁极补偿对磁头电阻变化的灵敏度，选择性地调节峰值补偿以及调整补偿零点的频率。

公开(公告)号：US20040044944A1

公开(公告)日：2004-03-04

申请号：US10463860

申请日：2003-06-18

申请人： Samsung Electronics Co., Ltd.

发明人： Seung-hyun Song

IPC分类号： G11C029/00

CPC分类号： G11B5/012 ,  G11B5/3136 ,  G11B5/4886 ,  G11B5/6064 ,  G11B20/18 ,  G11B2005/001 ,  G11B2005/0013

摘要： A method of and an apparatus for controlling a data storage system according to a temperature which thermally expands a write head pole tip of a write head includes supplying the write head with a predetermined warming current in a low temperature environment, so as to prevent a degradation of a writing characteristic of a signal in an initial writing stage. Therefore, errors due to a degradation of a signal level written in a sector of an initial writing mode do not occur by performing a warming write using the predetermined warming current so that data existing in a storage system before performing a writing mode is not erased, and by sufficiently thermally expanding the write head pole tip of the write head until a saturation state before writing starts.

摘要翻译： 一种用于根据温度扩展写入头的写入头极尖的温度来控制数据存储系统的方法和装置包括在低温环境中向写入头提供预定的加热电流，以防止劣化 在初始写入阶段中的信号的写入特性。 因此，通过使用预定的加热电流进行加温写入，不会发生由于写入初始写入模式的扇区的信号电平的劣化而导致的误差，使得在执行写入模式之前存储在存储系统中的数据不被擦除， 并且通过充分地热膨胀写入头的写头极尖直到写入开始之前的饱和状态。

公开(公告)号：US06687066B1

公开(公告)日：2004-02-03

申请号：US09510442

申请日：2000-02-21

申请人： Hieu Van Nguyen

发明人： Hieu Van Nguyen

IPC分类号： G11B509

CPC分类号： G11B20/10481 ,  G11B5/012 ,  G11B5/02 ,  G11B5/09 ,  G11B20/10009 ,  G11B2005/0013

摘要： Apparatus in a disc drive for transferring data between a rotatable disc and a host computer. An analog pre-processor integrated circuit device incorporates circuitry to carry out analog processing functions including write current driving, readback signal amplification, prewrite compensation, frequency-domain filtering, and equalization. A digital post-processor integrated circuit device incorporates circuitry to carry out digital signal processing functions including Viterbi detection, decoding, error detection and correction, buffering, host interface functions, and data encoding and serialization. The analog pre-processor is preferably mounted within the interior environment of the disc drive to an actuator assembly that supports a head adjacent the disc. The digital post-processor is preferably supported on a printed circuit board mounted to an exterior surface of the disc drive.

摘要翻译： 用于在可旋转盘和主计算机之间传送数据的盘驱动器中的装置。 模拟预处理器集成电路器件包含执行模拟处理功能的电路，包括写入电流驱动，回读信号放大，预写补偿，频域滤波和均衡。 数字后处理器集成电路器件包括用于执行数字信号处理功能的电路，包括维特比检测，解码，错误检测和校正，缓冲，主机接口功能以及数据编码和串行化。 模拟预处理器优选地安装在盘驱动器的内部环境中，以支持邻近盘的头部的致动器组件。 数字后处理器优选地被支撑在安装到盘驱动器的外表面的印刷电路板上。