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    Head-medium contact detection using high frequency heater oscillation
    2.
    发明授权
    Head-medium contact detection using high frequency heater oscillation 有权
    使用高频加热器振荡的头 - 介质接触检测

    公开(公告)号：US09437234B1

    公开(公告)日：2016-09-06

    申请号：US14831314

    申请日：2015-08-20

    Applicant: Seagate Technology LLC

    Inventor： Shi Jung Kim ,  Dong Wook Lee ,  Ju Yong Lee ,  Won Choul Yang

    IPC: G11B5/60 ,  G11B7/1263 ,  G11B20/18 ,  G11B5/31 ,  G11B5/00

    CPC classification number: G11B5/6076 ,  G11B5/3136 ,  G11B5/607 ,  G11B7/1263 ,  G11B20/18 ,  G11B2005/0021

    Abstract: An apparatus comprises a read/write head having a heater, wherein a low- or non-modulation interface is defined between the head and a magnetic recording medium. A microactuator is coupled to the head. A main actuator is coupled to the microactuator and the head. A controller is coupled to the main actuator, the microactuator, and the head. The controller is configured to control movement of the main actuator and the microactuator in response to a position error signal. The controller is further configured to induce an oscillation in the heater at a predetermined frequency. A detector is coupled to the controller. The detector is configured to sense a disturbance in the PES supplied to the microactuator resulting from the induced heater oscillation, and detect contact between the head and the medium using the PES disturbance.

    Abstract translation: 一种装置包括具有加热器的读/写头，其中在头和磁记录介质之间限定低调或非调制接口。 微型致动器耦合到头部。 主致动器联接到微致动器和头部。 控制器耦合到主致动器，微致动器和头。 控制器被配置为响应于位置误差信号来控制主致动器和微致动器的运动。 控制器还被配置为以预定频率诱发加热器中的振荡。 检测器耦合到控制器。 检测器被配置为感测由感应的加热器振荡产生的提供给微致动器的PES中的干扰，并使用PES干扰来检测头部和介质之间的接触。

    ADAPTIVE LASER OUTPUT CONTROL IN A HAMR DEVICE
    5.
    发明申请
    ADAPTIVE LASER OUTPUT CONTROL IN A HAMR DEVICE 有权
    自适应激光输出控制在HAMR设备

    公开(公告)号：US20160307590A1

    公开(公告)日：2016-10-20

    申请号：US14688049

    申请日：2015-04-16

    Applicant: Seagate Technology LLC

    Inventor： Won Choul Yang ,  Shi Jung Kim ,  Ju Yong Lee

    IPC: G11B7/1267

    CPC classification number: G11B7/1267 ,  G11B5/02 ,  G11B5/3133 ,  G11B7/126 ,  G11B7/1263 ,  G11B2005/001 ,  G11B2005/0021

    Abstract: A current temperature of a data storage device having a heat assisted recording (HAMR) device is measured while in idle. A threshold laser diode power output of the HAMR device is calculated at the current temperature when there is a change between a previous temperature and the current temperature. A new laser diode current that produced the calculated threshold laser diode power output is applied to the HAMR device when there is a change between the currently applied laser diode current and the new laser diode current.

    Abstract translation: 在空闲状态下测量具有热辅助记录（HAMR）装置的数据存储装置的当前温度。 当在先前温度和当前温度之间存在变化时，在当前温度下计算HAMR器件的阈值激光二极管功率输出。 当激光二极管电流和新激光二极管电流之间发生变化时，产生计算出的阈值激光二极管功率输出的新型激光二极管电流被施加到HAMR器件。

    Adaptive laser output control in a HAMR device
    6.
    发明授权
    Adaptive laser output control in a HAMR device 有权
    HAMR设备中的自适应激光输出控制

    公开(公告)号：US09472229B1

    公开(公告)日：2016-10-18

    申请号：US14688049

    申请日：2015-04-16

    Applicant: Seagate Technology LLC

    Inventor： Won Choul Yang ,  Shi Jung Kim ,  Ju Yong Lee

    IPC: G11B7/1263 ,  G11B7/126 ,  G11B7/1267 ,  G11B5/00

    CPC classification number: G11B7/1267 ,  G11B5/02 ,  G11B5/3133 ,  G11B7/126 ,  G11B7/1263 ,  G11B2005/001 ,  G11B2005/0021

    Abstract: A current temperature of a data storage device having a heat assisted recording (HAMR) device is measured while in idle. A threshold laser diode power output of the HAMR device is calculated at the current temperature when there is a change between a previous temperature and the current temperature. A new laser diode current that produced the calculated threshold laser diode power output is applied to the HAMR device when there is a change between the currently applied laser diode current and the new laser diode current.

    Abstract translation: 在空闲状态下测量具有热辅助记录（HAMR）装置的数据存储装置的当前温度。 当在先前温度和当前温度之间存在变化时，在当前温度下计算HAMR器件的阈值激光二极管功率输出。 当激光二极管电流和新激光二极管电流之间发生变化时，产生计算出的阈值激光二极管功率输出的新型激光二极管电流被施加到HAMR器件。

    Apparatus and method for measuring surface charge of a slider
    7.
    发明授权
    Apparatus and method for measuring surface charge of a slider 有权
    用于测量滑块表面电荷的装置和方法

    公开(公告)号：US09245561B1

    公开(公告)日：2016-01-26

    申请号：US14666765

    申请日：2015-03-24

    Applicant: Seagate Technology LLC

    Inventor： Ju Yong Lee ,  Won Choul Yang ,  Shi Jung Kim

    IPC: G11B21/02 ,  G11B5/60

    CPC classification number: G11B5/6017 ,  G11B5/607 ,  G11B5/6076

    Abstract: An apparatus comprises a slider that includes a fly height sensor. A signal generator is coupled to the slider. The signal generator is configured to generate an AC electrical signal having a DC offset voltage and to adjust the DC offset of the AC electrical signal to a plurality of DC offset voltages. Circuitry is coupled to the fly height sensor and the signal generator. The circuitry is configured to measure fly height of the slider in response to application of the AC electrical signal with varying DC offset voltages to the slider. The circuitry is further configured to determine an extremum of the measured fly heights and generate an output that includes the DC offset voltage associated with the fly height extremum.

    Abstract translation: 一种装置包括包括飞高传感器的滑块。 信号发生器耦合到滑块。 信号发生器被配置为产生具有DC偏移电压的AC电信号，并且将AC电信号的DC偏移调整到多个DC偏移电压。 电路耦合到飞行高度传感器和信号发生器。 电路被配置为响应于具有变化的DC偏移电压的AC电信号到滑块来测量滑块的飞行高度。 该电路还被配置成确定所测量的飞行高度的极值，并产生包括与飞行高度极值相关联的DC偏移电压的输出。

    Adaptive write pole tip protrusion compensation
    9.
    发明授权
    Adaptive write pole tip protrusion compensation 有权
    自适应写极尖突起补偿

    公开(公告)号：US08934188B1

    公开(公告)日：2015-01-13

    申请号：US14036863

    申请日：2013-09-25

    Applicant: Seagate Technology LLC

    Inventor： Shi Jung Kim ,  Won Choul Yang ,  Ju Yong Lee

    IPC: G11B5/02 ,  G11B27/36

    CPC classification number: G11B5/012 ,  G11B5/455 ,  G11B5/607

    Abstract: Technologies are described herein for adaptive write pole tip protrusion compensation in a storage device having magnetic recording media. Variations in temperature of a head of a storage device are measured for various combinations of values of write-channel parameters during multiple test writes to the recording media. Sensitivity of the head temperature to change in value of the write-channel parameters is determined from the temperature measurements. A ratio of change in write pole tip protrusion of the head to change in head temperature is also determined. From the sensitivity of the head temperature to change in value of the write-channel parameters and the ratio of change in write pole tip protrusion of the head to change in head temperature, a coefficient corresponding to each write-channel parameter is calculated for the head to be utilized in a write pole tip protrusion compensation mechanism of the storage device.

    Abstract translation: 本文中描述了在具有磁记录介质的存储装置中的自适应写极尖突起补偿技术。 在针对记录介质的多次测试写入期间，针对写入通道参数的值的各种组合来测量存储设备的磁头的温度变化。 根据温度测量确定磁头温度对写通道参数值变化的灵敏度。 还确定了磁头的磁头尖端突起与磁头温度变化的变化率。 从头温度的灵敏度到写通道参数的值的变化以及磁头的写入极尖突起的变化比率与磁头温度的变化相对应，针对磁头的每个写通道参数对应的系数 用于存储装置的写极尖突起补偿机构。

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