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    HEAT-ASSISTED MAGNETIC RECORDING HEAD-DISK CLEARANCE SETTING
    1.
    发明申请
    HEAT-ASSISTED MAGNETIC RECORDING HEAD-DISK CLEARANCE SETTING 有权
    热辅助记录头盘清洁设置

    公开(公告)号：US20160232930A1

    公开(公告)日：2016-08-11

    申请号：US14619795

    申请日：2015-02-11

    Applicant: Seagate Technology LLC

    Inventor： Huazhou Lou ,  Jason Riddering

    IPC: G11B5/60

    CPC classification number: G11B5/607 ,  G11B5/6029 ,  G11B5/6076 ,  G11B5/6088 ,  G11B2005/0021

    Abstract: A magnetic recording head comprises a transducer, a heater, a writer and a laser. The transducer is configured to write to a magnetic recording medium during a write operation. The heater, writer and laser are configured to affect a protrusion of the transducer. The heater is calibrated to produce a pre-write heater power to obtain a target pre-write clearance for a write operation through use of a clearance-heater power curve. The curve is generated by measuring a clearance between the transducer and the medium as the heater is cycled from zero to a contact power.

    Abstract translation: 磁记录头包括换能器，加热器，写入器和激光器。 传感器配置为在写入操作期间写入磁记录介质。 加热器，写入器和激光器被配置成影响换能器的突起。 加热器被校准以产生预写加热器功率，以通过使用间隙加热器功率曲线获得用于写入操作的目标预写间隙。 当加热器从零循环到接触功率时，通过测量换能器和介质之间的间隙来产生曲线。

    Estimating narrow, laser-induced protrusion at a near-field transducer
    2.
    发明授权
    Estimating narrow, laser-induced protrusion at a near-field transducer 有权
    估计近场传感器处的窄激光诱发突起

    公开(公告)号：US08873353B1

    公开(公告)日：2014-10-28

    申请号：US14254179

    申请日：2014-04-16

    Applicant: Seagate Technology LLC

    Inventor： Jason Riddering

    IPC: G11B11/00 ,  G11B13/08 ,  G11B21/12 ,  G11B5/48 ,  G11B5/00

    CPC classification number: G11B5/314 ,  G11B5/6029 ,  G11B5/607 ,  G11B5/6088 ,  G11B2005/0021

    Abstract: Fixed patterns are written on a track of a heat-assisted, recording medium at multiple, heater-induced write clearances via a recording head. The writing involves heating the recording medium via a near-field transducer of the recording head. Amplitudes of the fixed patterns are read back at a predetermined read clearance. A clearance difference between a start and an end of a first data sector of the track is determined based on the amplitudes. A narrow, laser-induced protrusion is estimated at the near-field transducer based on the clearance difference.

    Abstract translation: 固定图案通过记录头以多个加热器引起的写入间隙写在热辅助记录介质的轨道上。 该写入涉及通过记录头的近场传感器加热记录介质。 以预定的读取间隙读回固定图案的幅度。 基于振幅来确定轨道的第一数据扇区的开始和结束之间的间隙差。 基于间隙差在近场换能器处估计出狭窄的激光诱发突起。

    Heat-assisted magnetic recording head-disk clearance setting
    3.
    发明授权
    Heat-assisted magnetic recording head-disk clearance setting 有权
    热辅助磁记录头盘间隙设置

    公开(公告)号：US09472225B2

    公开(公告)日：2016-10-18

    申请号：US14619795

    申请日：2015-02-11

    Applicant: Seagate Technology LLC

    Inventor： Huazhou Lou ,  Jason Riddering

    IPC: G11B5/60 ,  G11B5/00

    CPC classification number: G11B5/607 ,  G11B5/6029 ,  G11B5/6076 ,  G11B5/6088 ,  G11B2005/0021

    Abstract: A magnetic recording head comprises a transducer, a heater, a writer and a laser. The transducer is configured to write to a magnetic recording medium during a write operation. The heater, writer and laser are configured to affect a protrusion of the transducer. The heater is calibrated to produce a pre-write heater power to obtain a target pre-write clearance for a write operation through use of a clearance-heater power curve. The curve is generated by measuring a clearance between the transducer and the medium as the heater is cycled from zero to a contact power.

    Abstract translation: 磁记录头包括换能器，加热器，写入器和激光器。 传感器配置为在写入操作期间写入磁记录介质。 加热器，写入器和激光器被配置成影响换能器的突起。 加热器被校准以产生预写加热器功率，以通过使用间隙加热器功率曲线来获得用于写入操作的目标预写间隙。 当加热器从零循环到接触功率时，通过测量换能器和介质之间的间隙来产生曲线。

    CONCURRENT MODULATION AND FRICTIONAL HEATING HEAD DISK CONTACT DETECTION
    4.
    发明申请
    CONCURRENT MODULATION AND FRICTIONAL HEATING HEAD DISK CONTACT DETECTION 有权
    电流调节和摩擦加热头盘接触检测

    公开(公告)号：US20160232931A1

    公开(公告)日：2016-08-11

    申请号：US14619769

    申请日：2015-02-11

    Applicant: Seagate Technology LLC

    Inventor： Huazhou Lou ,  Jason Riddering ,  Shawn S. Silewski ,  Dongming Liu ,  Lin Zhou

    IPC: G11B5/60

    CPC classification number: G11B5/6076 ,  G11B5/314 ,  G11B5/6017 ,  G11B5/607 ,  G11B5/6088 ,  G11B7/00 ,  G11B11/10558 ,  G11B11/1058 ,  G11B2005/0021 ,  G11B2220/2525

    Abstract: An apparatus comprises a heat-assisted magnetic recording (HAMR) head, a sensor, and a controller. The HAMR head is configured to interact with a magnetic storage medium. The sensor is configured to produce a signal indicating the occurrence of head-medium contact. The controller is configured to receive the signal and concurrently determine from the signal if the occurrence of head-medium contact is caused by a first contact detection parameter, a second contact detection parameter, or both the first and second contact detection parameters.

    Abstract translation: 一种装置包括热辅助磁记录（HAMR）头，传感器和控制器。 HAMR头配置成与磁存储介质相互作用。 传感器被配置为产生指示头 - 介质接触的发生的信号。 控制器被配置为接收信号并且同时从信号确定头 - 介质接触的发生是由第一接触检测参数，第二接触检测参数或第一和第二接触检测参数两者引起的。

    Current boost profile applied to laser during heat-assisted magnetic recording
    6.
    发明授权
    Current boost profile applied to laser during heat-assisted magnetic recording 有权
    在热辅助磁记录中应用于激光的电流增强曲线

    公开(公告)号：US09202506B1

    公开(公告)日：2015-12-01

    申请号：US14595740

    申请日：2015-01-13

    Applicant: Seagate Technology LLC

    Inventor： Drew Michael Mader ,  Alfredo Sam Chu ,  Jason Riddering

    IPC: G11B7/1263 ,  G11B5/31 ,  G11B5/48 ,  G11B5/60 ,  G11B5/00

    CPC classification number: G11B7/1263 ,  G11B5/3133 ,  G11B5/314 ,  G11B5/4866 ,  G11B5/6088 ,  G11B2005/0021

    Abstract: A power level is applied to a laser that heats a heat-assisted recording medium is increased during recording for a plurality of iterations. Each iteration involves writing test data to a plurality of sequential tracks of the recording medium using the power level and determining bit error rates of the test data. Based on the bit error rates of the iterations, a power boost profile is determined. The power boost profile starts at a baseline level at a first track of a plurality of sequentially-written tracks, incrementally increases to a steady-state level over a first portion of the tracks, and remains at the steady-state level over subsequent ones of the tracks. The power boost profile is applied to the laser when recording to the recording medium.

    Abstract translation: 对于在多次迭代的记录期间加热热辅助记录介质的激光器施加功率电平。 每次迭代涉及使用功率电平将测试数据写入记录介质的多个顺序轨道并确定测试数据的误码率。 基于迭代的误码率，确定功率提升曲线。 功率提升曲线在多个顺序写入的轨道的第一轨道处的基线水平处开始，在轨道的第一部分上递增地增加到稳态水平，并且在随后的轨迹中保持在稳态水平 轨道。 当记录到记录介质时，功率提升曲线被应用于激光器。

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