公开(公告)号：US20170194024A1

公开(公告)日：2017-07-06

申请号：US14988651

申请日：2016-01-05

Applicant: HGST Netherlands B.V.

Inventor： Richard Leo Galbraith ,  Weldon Mark Hanson ,  Mark A. Nichols ,  Alexander Taratorin ,  Roger William Wood

IPC: G11B5/596

CPC classification number: G11B5/59683 ,  G11B5/59627

Abstract: A method, apparatus, and system are provided for implementing track following using signal asymmetry metrics monitored during read back in hard disk drives (HDDs). Signal asymmetry metrics monitored during read back are used together with a position error signal (PES) to correct and guide the position of a read sensor with respect to a written track in the HDD.

公开(公告)号：US09123369B2

公开(公告)日：2015-09-01

申请号：US14482124

申请日：2014-09-10

Applicant: Marvell World Trade Ltd.

Inventor： Mats Oberg ,  Qiyue Zou ,  Gregory Burd

IPC: G11B21/02 ,  G11B5/596 ,  G11B5/48 ,  G11B5/55

CPC classification number: G11B5/59627 ,  G11B5/4886 ,  G11B5/553 ,  G11B5/59683

Abstract: Determining the radial position of a first read head of a storage device includes reading servo data from a storage media platter surface using the first read head, deriving from that servo data a first positron error signal representing a first estimate of the radial position of the first read head, reading the servo data from the storage media platter surface using a different read head, deriving from that servo data a second position error signal representing an estimate of the radial position of the different read head, and combining the first estimate of the radial position of the first read head and the estimate of the radial position of the different read head to obtain a revised estimate of the radial position of the first read head. The combining could include taking account of a known positional offset between the first read head and the different read head.

Abstract translation: 确定存储设备的第一读取头的径向位置包括使用第一读取头从存储媒体盘片表面读取伺服数据，从该伺服数据中导出表示第一和第二读取头的径向位置的第一估计的第一正电子误差信号 读取头，使用不同的读取头从存储介质盘表面读取伺服数据，从该伺服数据导出表示不同读取头的径向位置的估计的第二位置误差信号，并组合径向的第一估计 第一读取头的位置和不同读取头的径向位置的估计，以获得第一读取头的径向位置的修正估计。 组合可以包括考虑第一读头和不同读头之间的已知位置偏移。

公开(公告)号：US09099135B1

公开(公告)日：2015-08-04

申请号：US14644343

申请日：2015-03-11

Applicant: Seagate Technology LLC

Inventor： HaoJi Bao ,  Aigang Feng ,  Myint Ngwe

IPC: G11B5/596

CPC classification number: G11B5/59627 ,  G11B5/596 ,  G11B5/59683 ,  G11B5/59688

Abstract: Methods including determining a distribution of a position error signal (PES) of a magnetoresistive head by obtaining PES data from a servo controller associated with the magnetoresistive head; determining an encroachment function of a storage disc; and determining a track density of the storage disc by considering both the PES distribution and the encroachment function.

Abstract translation: 方法包括通过从与磁阻头相关联的伺服控制器获得PES数据来确定磁阻头的位置误差信号（PES）的分布; 确定存储盘的侵占功能; 以及通过考虑PES分布和侵占功能来确定存储盘的轨道密度。

公开(公告)号：US07961418B2

公开(公告)日：2011-06-14

申请号：US11747681

申请日：2007-05-11

Applicant: Naoko Takemoto ,  Motomu Hashizume

Inventor： Naoko Takemoto ,  Motomu Hashizume

IPC: G11B5/03

CPC classification number: G11B5/59683 ,  G11B5/02 ,  G11B2005/0008

Abstract: Resistivity sense bias circuits are described herein. An example resistivity sense bias circuit for use with a magnetoresistive read head includes a current biasing portion configured to provide a bias current across the magnetoresistive read head thereby establishing a bias voltage across the magnetoresistive read head, a resistivity sensing portion coupled to the current biasing portion and configured to sense a change in the bias current based on a resistivity change of the magnetoresistive read head, and a voltage source to provide the bias voltage and to adjust the bias voltage in response to the resistivity change of the magnetoresistive read head.

Abstract translation: 本文描述了电阻率检测偏置电路。 用于磁阻读取头的示例电阻率检测偏置电路包括电流偏置部分，其被配置为在磁阻读取头两端提供偏置电流，从而在磁阻读取头两端建立偏置电压，耦合到电流偏置部分的电阻率检测部分 并且被配置为基于磁阻读取头的电阻率变化和电压源来感测偏置电流的变化，以提供偏置电压并且响应于磁阻读取头的电阻率变化来调整偏置电压。

公开(公告)号：US07782575B2

公开(公告)日：2010-08-24

申请号：US11698180

申请日：2007-01-26

Applicant: Yoshihiro Tsuchiya ,  Kei Hirata ,  Tomohito Mizuno ,  Koji Shimazawa

Inventor： Yoshihiro Tsuchiya ,  Kei Hirata ,  Tomohito Mizuno ,  Koji Shimazawa

IPC: G11B5/39

CPC classification number: G11B5/59683 ,  B82Y10/00 ,  B82Y25/00 ,  G01R33/093 ,  G11B5/3909 ,  G11B5/3929 ,  G11B2005/3996

Abstract: An MR element includes: a free layer having a direction of magnetization that changes in response to a signal magnetic field; a pinned layer having a fixed direction of magnetization; and a spacer layer disposed between these layers. The spacer layer includes a first nonmagnetic metal layer and a second nonmagnetic metal layer each made of a nonmagnetic metal material, and a semiconductor layer that is made of a material containing an oxide semiconductor and that is disposed between the first and second nonmagnetic metal layers. The MR element has a resistance-area product within a range of 0.1 to 0.3Ω·μm2, and the spacer layer has a conductivity within a range of 133 to 432 S/cm.

Abstract translation: MR元件包括：具有响应于信号磁场而改变的磁化方向的自由层; 具有固定的磁化方向的钉扎层; 以及设置在这些层之间的间隔层。 间隔层包括由非磁性金属材料制成的第一非磁性金属层和第二非磁性金属层，以及由含有氧化物半导体的材料制成并且设置在第一和第二非磁性金属层之间的半导体层。 MR元件的电阻面积为0.1〜0.3Ω·Ω·cm 2，间隔层的导电率为133〜432S / cm。

公开(公告)号：US07330335B2

公开(公告)日：2008-02-12

申请号：US10946011

申请日：2004-09-22

Applicant: Akira Kikitsu ,  Tadashi Kai ,  Junichi Akiyama

Inventor： Akira Kikitsu ,  Tadashi Kai ,  Junichi Akiyama

IPC: G11B5/127

CPC classification number: G11B5/66 ,  B82Y10/00 ,  B82Y25/00 ,  G11B5/00 ,  G11B5/012 ,  G11B5/02 ,  G11B5/1278 ,  G11B5/3916 ,  G11B5/3925 ,  G11B5/488 ,  G11B5/59683 ,  G11B5/743 ,  G11B5/746 ,  G11B5/82 ,  G11B7/00 ,  G11B2005/0002 ,  G11B2005/0005 ,  G11B2005/0021 ,  G11B2005/3996 ,  Y10T428/24942 ,  Y10T428/31

Abstract: A magnetic recording medium capable of alleviating thermal fluctuation and improving the recording density includes a functional layer (12) containing a magnetic material, and a recording layer (11) overlying the functional layer and containing a magnetic material. The recording layer contains a plurality of magnetic grains (51) and a nonmagnetic material (52) existing among the magnetic grains, and the functional layer and the recording layer exert exchange coupling interaction in a direction making a substantially orthogonal relation with each other at the room temperature.

Abstract translation: 能够减轻热波动并提高记录密度的磁记录介质包括含有磁性材料的功能层（12）和覆盖功能层并含有磁性材料的记录层（11）。 记录层包含存在于磁性颗粒之间的多个磁性颗粒（51）和非磁性材料（52），功能层和记录层在相互之间形成基本正交的方向上发挥交换耦合相互作用 室内温度。

公开(公告)号：US20070279809A1

公开(公告)日：2007-12-06

申请号：US11783098

申请日：2007-04-05

Applicant: Daisuke Myiauchi ,  Kazuki Sato ,  Takayasu Kanaya ,  Takahiko Machita

Inventor： Daisuke Myiauchi ,  Kazuki Sato ,  Takayasu Kanaya ,  Takahiko Machita

IPC: G11B17/00

CPC classification number: G11B5/3163 ,  G11B5/398 ,  G11B5/59683 ,  H01L43/08 ,  H01L43/12

Abstract: A magneto-resistance effect element comprises a stacked body which comprises a pinned layer having a fixed magnetization direction, a free layer having a magnetization direction that varies according to an external magnetic field, and a nonmagnetic spacer layer which is interposed between the pinned layer and the free layer. The stacked body having a constricted shape in which at least one part of the spacer layer is constricted when viewed from at least one direction perpendicular to a stacked direction of the stacked body.

Abstract translation: 磁阻效应元件包括层叠体，该层叠体包括具有固定的磁化方向的被钉扎层，具有根据外部磁场变化的磁化方向的自由层，以及插入在被钉扎层和被覆层之​​间的非磁性间隔层 自由层。 所述层叠体具有收缩形状，其中当从垂直于所述层叠体的堆叠方向的至少一个方向观察时，所述间隔层的至少一部分收缩。

公开(公告)号：US07173785B2

公开(公告)日：2007-02-06

申请号：US10601266

申请日：2003-06-19

Applicant: Manabu Saikawa ,  Hirofumi Yanase

Inventor： Manabu Saikawa ,  Hirofumi Yanase

IPC: G11B5/09 ,  G11B5/00 ,  G11B20/20

CPC classification number: G11B5/012 ,  G11B5/4886 ,  G11B5/59683

Abstract: Provided is a data storage device in which read and write heads can be desirably located with respect to servo tracks from the viewpoint of linearity of a PES on the premise that a read write offset exists. A read write offset value, which is a deviation amount between write and read heads in a radial direction of a disk-shaped storage medium, is set equivalent to an integer number N of servo tracks.

Abstract translation: 提供了一种数据存储装置，其中，在存在读取写入偏移的前提下，从PES的线性的角度来看，可以期望相对于伺服磁道定位读取和写入磁头。 作为盘状存储介质的径向的写入头和读取头之间的偏移量的读取写入偏移值被设定为相当于整数N的伺服记录道。

公开(公告)号：US06950260B2

公开(公告)日：2005-09-27

申请号：US09874673

申请日：2001-06-04

Applicant: Kevin Robert Coffey ,  Robert Edward Fontana, Jr. ,  Jan-Ulrich Thiele

Inventor： Kevin Robert Coffey ,  Robert Edward Fontana, Jr. ,  Jan-Ulrich Thiele

IPC: G11B5/02 ,  G11B5/55 ,  G11B5/596 ,  G11B27/36

CPC classification number: G11B5/02 ,  G11B5/5521 ,  G11B5/59683

Abstract: A magnetic recording system is provided having a write head employing a combination of magnetic write field gradient and thermal gradient to write data on a ‘thermal spring’ magnetic recording media. The write head comprises a magnetic element using a write current to induce a magnetic write field at the magnetic media and a thermal element using a very small aperture laser to heat a portion of the media. The thermal spring magnetic media comprises [comprises] first and second stacks providing two exchange coupled ferromagnetic layers having different Curie temperatures [The first stack has a high magneto-crystalline anisotropy, a relatively low saturation magnetization and a low Curie temperature.] [The second stack has a relatively low magneto-crystalline anisotropy, a high saturation magnetization and a high Curie temperature.] The magnetic field gradient and the thermal gradient are arranged to substantially overlap at the trailing edge of the heated portion of the magnetic media allowing data at high density with high thermal stability to be recorded on the rapidly cooling thermal spring magnetic recording media.

Abstract translation: 提供磁记录系统，其具有采用磁写场梯度和热梯度的组合的写头，以在“温度弹簧”磁记录介质上写入数据。 写头包括使用写入电流以在磁性介质上引起磁写入场的磁性元件，以及使用非常小的孔径激光器加热介质的一部分的热元件。 热弹簧磁介质包括[包括]第一和第二堆叠，提供具有不同居里温度的两个交换耦合铁磁层[第一堆叠具有高磁晶各向异性，相对低的饱和磁化强度和低居里温度]。[第二 堆叠具有相对较低的磁晶各向异性，高饱和磁化强度和高居里温度。]磁场梯度和热梯度被布置成在磁介质的加热部分的后缘处基本上重叠，允许高数据 具有高热稳定性的密度被记录在快速冷却的热弹簧磁记录介质上。

公开(公告)号：US06909567B2

公开(公告)日：2005-06-21

申请号：US10053394

申请日：2001-10-29

Applicant: Brett A. McClellan ,  Zubir Adal

Inventor： Brett A. McClellan ,  Zubir Adal

IPC: G11B5/00 ,  G11B5/596 ,  G11B19/04 ,  G11B20/10 ,  G11B27/30 ,  G11B5/09

CPC classification number: B82Y10/00 ,  G11B5/59616 ,  G11B5/5965 ,  G11B5/59683 ,  G11B19/04 ,  G11B20/10009 ,  G11B27/3027 ,  G11B2005/0008 ,  G11B2005/0016 ,  G11B2220/20

Abstract: A circuit to detect pin layer reversal including an input circuit to receive an input signal having a first portion to indicate a pin layer reversal and having a second portion to indicate a servo sync mark, a first servo sync mark detector for detecting a positive servo sync mark from the input signal, a second servo sync mark detector for detecting a negative servo sync mark from the input signal, and a circuit responsive to the positive servo sync mark and the negative servo sync mark to generate a signal to indicate if the servo sync mark has been reversed and to generate a signal to indicate the pin layer reversal.

Abstract translation: 一种用于检测引脚层反转的电路，包括输入电路以接收具有第一部分的输入信号，以指示引脚层反转并具有指示伺服同步标记的第二部分;第一伺服同步标记检测器，用于检测正伺服同步 从输入信号标记的第二伺服同步标记检测器，用于从输入信号检测负伺服同步标记的第二伺服同步标记检测器，以及响应于正伺服同步标记和负伺服同步标记的电路，以产生信号以指示伺服同步 标记被反转，并产生一个信号以指示针层反转。