公开(公告)号：US09792940B2

公开(公告)日：2017-10-17

申请号：US13840962

申请日：2013-03-15

Applicant: Seagate Technology LLC

Inventor： Lin Zhou ,  Juil Lee ,  Dongming Liu ,  Huazhou Lou

IPC: G11B5/60

CPC classification number: G11B5/607 ,  G11B5/6076

Abstract: Using a high sample rate dPES, together with pulsed heater and lock-in technique, to improve dPES SNR for contact detection between the head and media surface. Steps of powering a transducing head actuator with pulsed input signal at a select data track offset from a previously-written to data track of the storage medium, where the pulsed input signal has select amplitude and duty cycle to simulate a response signal, and further locking in an amplitude with respect to the heater frequency, can lead to a determination of level of heater power for initiating contact between the transducing head and the storage medium.

公开(公告)号：US09123371B2

公开(公告)日：2015-09-01

申请号：US14050526

申请日：2013-10-10

Applicant: SEAGATE TECHNOLOGY LLC

Inventor： Huazhou Lou ,  Lin Zhou ,  Vincent Engelkes

IPC: G11B5/02 ,  G11B27/36 ,  G11B21/02 ,  G11B5/60 ,  G11B5/48 ,  G11B5/012

CPC classification number: G11B5/6076 ,  G11B5/012 ,  G11B5/4826 ,  G11B5/6011

Abstract: In certain embodiments, a head-suspension assembly includes a resonator attached to either a head or gimbal. The resonator is configured to resonate at a predefined resonant frequency. In certain embodiments, disc drives includes a recording medium, a head-suspension assembly, and a resonator. The resonator is attached to either a head or gimbal of the head-suspension assembly. The resonator is configured to resonate at a predefined resonant frequency.

Abstract translation: 在某些实施例中，头悬挂组件包括附接到头部或万向节的谐振器。 谐振器被配置为以预定的谐振频率谐振。 在某些实施例中，盘驱动器包括记录介质，磁头 - 悬架组件和谐振器。 谐振器连接到头悬挂组件的头部或万向节。 谐振器被配置为以预定的谐振频率谐振。

公开(公告)号：US20140269241A1

公开(公告)日：2014-09-18

申请号：US13840962

申请日：2013-03-15

Applicant: SEAGATE TECHNOLOGY LLC

Inventor： Lin Zhou ,  Juil Lee ,  Dongming Liu ,  Huazhou Lou

IPC: G11B21/12

CPC classification number: G11B5/607 ,  G11B5/6076

Abstract: Using a high sample rate dPES, together with pulsed heater and lock-in technique, to improve dPES SNR for contact detection between the head and media surface. Steps of powering a transducing head actuator with pulsed input signal at a select data track offset from a previously-written to data track of the storage medium, where the pulsed input signal has select amplitude and duty cycle to simulate a response signal, and further locking in an amplitude with respect to the heater frequency, can lead to a determination of level of heater power for initiating contact between the transducing head and the storage medium.

Abstract translation: 使用高采样率dPES，连同脉冲加热器和锁定技术，以提高头部和介质表面之间的接触检测的dPES SNR。 在选择数据轨道上从脉冲输入信号偏移到存储介质的先前写入数据轨道的脉冲输入信号为脉冲输入信号供电的步骤，其中脉冲输入信号具有选择幅度和占空比以模拟响应信号，并进一步锁定 在相对于加热器频率的振幅中，可以导致确定用于启动换能头和存储介质之间的接触的加热器功率的水平。

公开(公告)号：US11475924B2

公开(公告)日：2022-10-18

申请号：US17207027

申请日：2021-03-19

Applicant: Seagate Technology LLC

Inventor： Robert D. Turner ,  Yuhang Cheng ,  Peter W. Kanas ,  Martin Liam McGarry ,  Peter Kevin McGeehin ,  Kevin R. Heim ,  Edward Charles Gage ,  Shaikh Mubassar Ali ,  Huazhou Lou

IPC: G11B33/14 ,  G11B13/08 ,  G11B5/012 ,  G11B5/31 ,  G11B5/00

Abstract: A heat-assisted magnetic recording device is disposed in a hermetically sealed enclosure. The device includes a slider comprising a reader, a writer, and an optical waveguide configured to couple light from a light source to a near-field transducer situated at or near an air bearing surface of the slider. The near-field transducer comprises an enlarged portion and a peg extending from the enlarged portion in a direction of the air bearing surface. A fill gas is provided within the enclosure. The fill gas comprises a mixture of a low-density, inert gas and at least one gas that oxidizes carbon, where the total carbon oxidizing gas concentration of the fill gas is 3-50% by volume. In certain embodiments, the fill gas comprises a hydrogen concentration sufficient to retard oxidation of the peg when the peg is at an operating temperature associated with write operations.

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。

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。

公开(公告)号：US09171581B2

公开(公告)日：2015-10-27

申请号：US13790820

申请日：2013-03-08

Applicant: Seagate Technology LLC

Inventor： Huazhou Lou ,  Lin Zhou

IPC: G11B27/36 ,  G11B5/455 ,  G11B5/60

CPC classification number: G11B27/36 ,  G11B5/4555 ,  G11B5/6058 ,  G11B5/607 ,  G11B5/6076

Abstract: The application discloses a sensor device to measure friction force at a head-media interface. As disclosed, the sensor device has a transducer element oriented to provide an electrical output responsive to force or strain imparted to the transducer element along an in-plane axis. Sensor circuitry is coupled to the transducer element to process the electrical output to provide an output measure of friction force. In illustrated embodiments, the head includes an actuator element which is powered on/off at an on/off frequency to cyclically protrude a localized portion of the head. The on/off frequency of the actuator is used by the sensor circuitry to detect excitation of the sensor device due to friction force at the head-media interface.

Abstract translation: 本申请公开了一种用于测量头部 - 媒体界面上的摩擦力的传感器装置。 如所公开的，传感器装置具有换向器元件，该换能器元件被定向成响应于沿着平面内轴线传递给换能器元件的力或应变来提供电输出。 传感器电路耦合到换能器元件以处理电输出以提供摩擦力的输出量度。 在所示的实施例中，头部包括致动器元件，该致动器元件在开/关频率上通电/断开以循环地突出头部的局部部分。 致动器的开/关频率由传感器电路用于由于头 - 媒体界面处的摩擦力来检测传感器装置的激励。

公开(公告)号：US20140268410A1

公开(公告)日：2014-09-18

申请号：US14287419

申请日：2014-05-27

Applicant: Seagate Technology LLC

Inventor： Gary Joseph Kunkel ,  Huazhou Lou ,  Declan Macken ,  Timothy William Stoebe

IPC: G11B20/10

CPC classification number: G11B5/607 ,  G01K13/00 ,  G11B5/024 ,  G11B5/3133 ,  G11B5/6011 ,  G11B5/6076 ,  G11B7/0948 ,  G11B7/121 ,  G11B20/10 ,  G11B27/36

Abstract: A temperature sensor of a head transducer measures temperature near or at the close point. The measured temperature varies in response to changes in spacing between the head transducer and a magnetic recording medium. A detector is coupled to the temperature sensor and is configured to detect a change in a DC component of the measured temperature indicative of onset of contact between the head transducer and the medium. Another head transducer configuration includes a sensor having a sensing element with a high temperature coefficient of resistance to interact with asperities of the medium. Electrically conductive leads are connected to the sensing element and have a low temperature coefficient of resistance relative to that of the sensing element, such thermally induced resistance changes in the leads have a negligible effect on a response of the sensing element to contact with the asperities.

Abstract translation: 头传感器的温度传感器测量靠近或接近的温度。 测量的温度响应于头部换能器和磁记录介质之间的间隔的变化而变化。 检测器耦合到温度传感器并且被配置为检测指示头部换能器和介质之间的接触开始的测量温度的DC分量的变化。 另一个头部传感器配置包括传感器，该传感器具有具有高温度系数的传感元件，以与介质的粗糙度相互作用。 导电引线连接到感测元件并且具有相对于感测元件的电阻的低温度系数，引线中的这种热感应电阻变化对感测元件与凹凸接触的响应具有可忽略的影响。

公开(公告)号：US09607649B1

公开(公告)日：2017-03-28

申请号：US15093882

申请日：2016-04-08

Applicant: Seagate Technology LLC

Inventor： Jason Riddering ,  Huazhou Lou

IPC: G11B11/00 ,  G11B7/1267 ,  G11B5/09 ,  G11B5/00 ,  G11B7/1263 ,  G11B11/105 ,  G11B7/126

CPC classification number: G11B5/607 ,  G11B5/455 ,  G11B5/5534 ,  G11B7/126 ,  G11B7/1263 ,  G11B11/10506 ,  G11B11/1051 ,  G11B2005/0021

Abstract: A test involves iterations over a series of laser powers of a heat-assisted read/write head. The iterations involve writing to a recording medium at the selected laser power for a sufficient duration to ensure thermal equilibrium of the read/write head at an end of the write. A clearance-control heater of the read/write head is transitioned from a pre-write power before a start of the write to a steady-state write power. The iterations further involve measuring a temperature of the read/write head during the write and adjusting the steady-state write power to achieve a predefined difference between the temperature at the start of the write and the end of the write. The adjusted steady state write power is stored for each iteration. A write-induced protrusion is determined based on the iterations and used for calibration of the read/write head.

公开(公告)号：US09595277B2

公开(公告)日：2017-03-14

申请号：US14797697

申请日：2015-07-13

Applicant: Seagate Technology LLC

Inventor： Huazhou Lou ,  Jason W. Riddering

IPC: G11B5/60

CPC classification number: G11B5/6029 ,  G11B5/5534 ,  G11B5/607 ,  G11B5/6076 ,  G11B2005/0021

Abstract: Method and apparatus for controlling the fly height of a transducer. In some embodiments, a data pattern is written to a rotating data recording surface using a transducer having a write element, a read element and a thermal assist energy source. A first protrusion distance for the read element induced by operation of the energy source is determined responsive to first and second readback amplitudes obtained from the data pattern using different first and second power levels applied to the energy source. A second protrusion distance for the write element induced by the energy source is determined responsive to the first protrusion distance.

Abstract translation: 用于控制换能器的飞行高度的方法和装置。 在一些实施例中，使用具有写入元件，读取元件和热辅助能量源的换能器将数据模式写入旋转数据记录表面。 响应于使用施加到能量源的不同的第一和第二功率电平从数据模式获得的第一和第二回读幅度来确定由能量源的操作引起的读取元件的第一突出距离。 响应于第一突出距离确定由能量源引起的写入元件的第二突出距离。