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1. 发明申请

US20170194024A1 IMPLEMENTING ENHANCED TRACK FOLLOWING DURING READ BACK USING HEAD ASYMMETRY METRICS IN HARD DISK DRIVES 有权
公开(公告)号：US20170194024A1
公开(公告)日：2017-07-06
申请号：US14988651
申请日：2016-01-05
申请人： HGST Netherlands B.V.
发明人： Richard Leo Galbraith , Weldon Mark Hanson , Mark A. Nichols , Alexander Taratorin , Roger William Wood
IPC分类号： G11B5/596
CPC分类号： G11B5/59683 , G11B5/59627
摘要： 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.

2. 发明授权

US09123369B2 Method and apparatus for determining position of multiple drive heads 有权
标题翻译：用于确定多个驱动头的位置的方法和装置
公开(公告)号：US09123369B2
公开(公告)日：2015-09-01
申请号：US14482124
申请日：2014-09-10
申请人： Marvell World Trade Ltd.
发明人： Mats Oberg , Qiyue Zou , Gregory Burd
IPC分类号： G11B21/02 , G11B5/596 , G11B5/48 , G11B5/55
CPC分类号： G11B5/59627 , G11B5/4886 , G11B5/553 , G11B5/59683
摘要： 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.
摘要翻译：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。

3. 发明授权

US09099135B1 Determining track density capability in a storage device 有权
标题翻译：确定存储设备中的磁道密度能力
公开(公告)号：US09099135B1
公开(公告)日：2015-08-04
申请号：US14644343
申请日：2015-03-11
申请人： Seagate Technology LLC
发明人： HaoJi Bao , Aigang Feng , Myint Ngwe
IPC分类号： G11B5/596
CPC分类号： G11B5/59627 , G11B5/596 , G11B5/59683 , G11B5/59688
摘要： 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.
摘要翻译：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。

4. 发明授权

US07961418B2 Resistivity sense bias circuits and methods of operating the same 有权
标题翻译：电阻率偏置电路及其操作方法
公开(公告)号：US07961418B2
公开(公告)日：2011-06-14
申请号：US11747681
申请日：2007-05-11
申请人： Naoko Takemoto , Motomu Hashizume
发明人： Naoko Takemoto , Motomu Hashizume
IPC分类号： G11B5/03
CPC分类号： G11B5/59683 , G11B5/02 , G11B2005/0008
摘要： 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.
摘要翻译：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。

5. 发明授权

US07782575B2 Magnetoresistive element having free layer, pinned layer, and spacer layer disposed therebetween, the spacer layer including semiconductor layer 有权
标题翻译：具有自由层，钉扎层和间隔层的磁阻元件设置在它们之间，间隔层包括半导体层
公开(公告)号：US07782575B2
公开(公告)日：2010-08-24
申请号：US11698180
申请日：2007-01-26
申请人： Yoshihiro Tsuchiya , Kei Hirata , Tomohito Mizuno , Koji Shimazawa
发明人： Yoshihiro Tsuchiya , Kei Hirata , Tomohito Mizuno , Koji Shimazawa
IPC分类号： G11B5/39
CPC分类号： G11B5/59683 , B82Y10/00 , B82Y25/00 , G01R33/093 , G11B5/3909 , G11B5/3929 , G11B2005/3996
摘要： 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.
摘要翻译： 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。

6. 发明授权

US07330335B2 Magnetic recording medium, magnetic recording apparatus and magnetic recording method 有权
标题翻译：磁记录介质，磁记录装置和磁记录方法
公开(公告)号：US07330335B2
公开(公告)日：2008-02-12
申请号：US10946011
申请日：2004-09-22
申请人： Akira Kikitsu , Tadashi Kai , Junichi Akiyama
发明人： Akira Kikitsu , Tadashi Kai , Junichi Akiyama
IPC分类号： G11B5/127
CPC分类号： 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
摘要： 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.
摘要翻译：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。

7. 发明申请

US20070279809A1 Magneto-resistance effect element, thin-film magnetic head, and method for manufacturing magneto-resistance effect element 有权
标题翻译：磁阻效应元件，薄膜磁头和制造磁阻效应元件的方法
公开(公告)号：US20070279809A1
公开(公告)日：2007-12-06
申请号：US11783098
申请日：2007-04-05
申请人： Daisuke Myiauchi , Kazuki Sato , Takayasu Kanaya , Takahiko Machita
发明人： Daisuke Myiauchi , Kazuki Sato , Takayasu Kanaya , Takahiko Machita
IPC分类号： G11B17/00
CPC分类号： G11B5/3163 , G11B5/398 , G11B5/59683 , H01L43/08 , H01L43/12
摘要： 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.
摘要翻译：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。

8. 发明授权

US07173785B2 Data storage device and servo information writing method 有权
标题翻译：数据存储设备和伺服信息写入方式
公开(公告)号：US07173785B2
公开(公告)日：2007-02-06
申请号：US10601266
申请日：2003-06-19
申请人： Manabu Saikawa , Hirofumi Yanase
发明人： Manabu Saikawa , Hirofumi Yanase
IPC分类号： G11B5/09 , G11B5/00 , G11B20/20
CPC分类号： G11B5/012 , G11B5/4886 , G11B5/59683
摘要： 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.
摘要翻译：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。

9. 发明授权

US06950260B2 Thermally assisted magnetic recording system and method of writing using magnetic and thermal gradients 有权
标题翻译：热辅助磁记录系统和使用磁和热梯度的写入方法
公开(公告)号：US06950260B2
公开(公告)日：2005-09-27
申请号：US09874673
申请日：2001-06-04
申请人： Kevin Robert Coffey , Robert Edward Fontana, Jr. , Jan-Ulrich Thiele
发明人： Kevin Robert Coffey , Robert Edward Fontana, Jr. , Jan-Ulrich Thiele
IPC分类号： G11B5/02 , G11B5/55 , G11B5/596 , G11B27/36
CPC分类号： G11B5/02 , G11B5/5521 , G11B5/59683
摘要： 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.
摘要翻译：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。

10. 发明授权

US06909567B2 Pin layer reversal detection 有权
标题翻译：针层反转检测
公开(公告)号：US06909567B2
公开(公告)日：2005-06-21
申请号：US10053394
申请日：2001-10-29
申请人： Brett A. McClellan , Zubir Adal
发明人： Brett A. McClellan , Zubir Adal
IPC分类号： G11B5/00 , G11B5/596 , G11B19/04 , G11B20/10 , G11B27/30 , G11B5/09
CPC分类号： B82Y10/00 , G11B5/59616 , G11B5/5965 , G11B5/59683 , G11B19/04 , G11B20/10009 , G11B27/3027 , G11B2005/0008 , G11B2005/0016 , G11B2220/20
摘要： 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.
摘要翻译：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。

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