公开(公告)号：US20190381629A1

公开(公告)日：2019-12-19

申请号：US16434853

申请日：2019-06-07

Applicant: Seagate Technology LLC

Inventor： Edwin Rejda ,  Andrew Habermas ,  Jeff O'Konski ,  Andrew Sherve ,  Michael Thomas Johnson ,  Dongming Liu

IPC: B24B37/04 ,  G11B5/31

Abstract: The present disclosure includes methods of lapping that include energizing one or more elements that are located proximal to a first magnetoresistive element in a transducer region and generate heat and cause the first magnetoresistive element to selectively expand in the lapping direction relative to one or more other magnetoresistive elements. The present disclosure also includes methods of lapping that use one or more thermal sensors located proximal to the first magnetoresistive element to help control lapping in the lapping direction. The present disclosure includes related lapping systems and sliders.

公开(公告)号：US09390741B2

公开(公告)日：2016-07-12

申请号：US14720299

申请日：2015-05-22

Applicant: Seagate Technology LLC

Inventor： Michael Thomas Johnson ,  Dongming Liu ,  Huazhou Lou ,  Declan Macken ,  Timothy William Stoebe ,  James Gary Wessel ,  Xuan Zheng

IPC: G11B5/02 ,  G11B5/60 ,  G11B20/10 ,  G01K13/00 ,  G11B5/024

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 head transducer, configured to interact with a magnetic recording medium, includes a first sensor having a temperature coefficient of resistance (TCR) and configured to produce a first sensor signal, and a second sensor having a TCR and configured to produce a second sensor signal. One of the first and second sensors is situated at or near a close point of the head transducer in relation to the magnetic recording medium, and the other of the first and second sensors spaced away from the close point. Circuitry is configured to combine the first and second sensor signals and produce a combined sensor signal indicative of one or both of a change in head-medium spacing and head-medium contact. Each of the sensors may have a TCR with the same sign (positive or negative) or each sensor may have a TCR with a different sign.

公开(公告)号：US20140355150A1

公开(公告)日：2014-12-04

申请号：US14457694

申请日：2014-08-12

Applicant: Seagate Technology LLC

Inventor： Michael Thomas Johnson ,  Dongming Liu ,  Huazhou Lou ,  Declan Macken ,  Timothy William Stoebe ,  James Gary Wessel ,  Xuan Zheng

IPC: G11B5/60

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 head transducer, configured to interact with a magnetic recording medium, includes a first sensor having a temperature coefficient of resistance (TCR) and configured to produce a first sensor signal, and a second sensor having a TCR and configured to produce a second sensor signal. One of the first and second sensors is situated at or near a close point of the head transducer in relation to the magnetic recording medium, and the other of the first and second sensors spaced away from the close point. Circuitry is configured to combine the first and second sensor signals and produce a combined sensor signal indicative of one or both of a change in head-medium spacing and head-medium contact. Each of the sensors may have a TCR with the same sign (positive or negative) or each sensor may have a TCR with a different sign.

Abstract translation: 被配置为与磁记录介质相互作用的头传感器包括具有温度系数电阻（TCR）并被配置为产生第一传感器信号的第一传感器，以及具有TCR并被配置为产生第二传感器信号的第二传感器 。 第一传感器和第二传感器中的一个位于头部换能器相对于磁记录介质的接近点附近，并且第一传感器和第二传感器中的另一个与近端点间隔开。 电路被配置为组合第一和第二传感器信号并产生指示头 - 介质间隔和头 - 介质接触的变化中的一个或两个的组合的传感器信号。 每个传感器可以具有相同符号（正或负）的TCR，或者每个传感器可以具有不同符号的TCR。

公开(公告)号：US20140254040A1

公开(公告)日：2014-09-11

申请号：US14165906

申请日：2014-01-28

Applicant: Seagate Technology LLC

Inventor： Dongming Liu ,  Kenneth Haapala ,  Scott E. Ryun ,  Lin Zhou

IPC: G11B5/58

CPC classification number: G11B5/581 ,  G11B5/607 ,  G11B5/6076

Abstract: An apparatus includes a head transducer configured to interact with a magnetic recording medium and a heater configured to thermally actuate the head transducer. A thermal sensor at or near the head transducer is configured to produce a sensor signal. Circuitry is coupled to the heater and configured to cause an oscillation in heater power. The heater power oscillation causes an oscillation in the sensor signal. A detector is coupled to the thermal sensor and configured to detect head-medium contact using the oscillating sensor signal and heater power.

Abstract translation: 一种装置包括：头部换能器，被配置为与磁记录介质相互作用;以及加热器，其被配置为热致动头部换能器。 在头部传感器处或附近的热传感器被配置成产生传感器信号。 电路耦合到加热器并且被配置为引起加热器功率的振荡。 加热器功率振荡导致传感器信号的振荡。 检测器耦合到热传感器并且被配置为使用振荡传感器信号和加热器功率检测头 - 介质接触。

公开(公告)号：US11691242B2

公开(公告)日：2023-07-04

申请号：US17720847

申请日：2022-04-14

Applicant: Seagate Technology LLC

Inventor： Edwin Rejda ,  Andrew Habermas ,  Jeff O'Konski ,  Andrew Sherve ,  Michael Thomas Johnson ,  Dongming Liu

IPC: G11B5/31 ,  B24B37/04

CPC classification number: B24B37/048 ,  G11B5/3169

Abstract: The present disclosure includes methods of lapping that include energizing one or more elements that are located proximal to a first magnetoresistive element in a transducer region and generate heat and cause the first magnetoresistive element to selectively expand in the lapping direction relative to one or more other magnetoresistive elements. The present disclosure also includes methods of lapping that use one or more thermal sensors located proximal to the first magnetoresistive element to help control lapping in the lapping direction. The present disclosure includes related lapping systems and sliders.

公开(公告)号：US09928873B1

公开(公告)日：2018-03-27

申请号：US15638839

申请日：2017-06-30

Applicant: Seagate Technology LLC

Inventor： Dongming Liu ,  Huazhou Lou ,  Eric John McCalla ,  James Robert Oscarson ,  Shawn S. Silewski

IPC: G11B21/02 ,  G11B21/21 ,  G11B23/50 ,  G11B5/40 ,  G11B5/60 ,  G11B7/122 ,  G11B5/00 ,  G11B5/31

CPC classification number: G11B21/21 ,  G11B5/3106 ,  G11B5/40 ,  G11B5/6064 ,  G11B5/607 ,  G11B5/6076 ,  G11B5/6082 ,  G11B7/122 ,  G11B23/507 ,  G11B2005/0016

Abstract: An apparatus comprises a slider configured for writing data to and reading data from a magnetic recording medium and for heat-assisted magnetic recording. The slider comprises a heater configured to receive an AC signal and to cause oscillation in a spacing between the slider and the medium, and a contact sensor situated on the slider and configured to produce a DC response signal. A detector is coupled to the slider and configured to measure an amplitude of a spike in the DC response signal, calculate a ratio between the spike amplitude and an amplitude of the DC response signal, and detect contact between the slider and the medium in response to the ratio exceeding a predetermined threshold.

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：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：US08638349B1

公开(公告)日：2014-01-28

申请号：US13793803

申请日：2013-03-11

Applicant: Seagate Technology LLC

Inventor： Dongming Liu ,  Kenneth Haapala ,  Scott E. Ryun ,  Lin Zhou

IPC: G11B21/12 ,  G11B5/455

CPC classification number: G11B5/581 ,  G11B5/607 ,  G11B5/6076

Abstract: An apparatus includes a head transducer configured to interact with a magnetic recording medium and a heater configured to thermally actuate the head transducer. A thermal sensor at or near the head transducer is configured to produce a sensor signal. Circuitry is coupled to the heater and configured to cause an oscillation in heater power. The heater power oscillation causes an oscillation in the sensor signal. A detector is coupled to the thermal sensor and configured to detect head-medium contact using the oscillating sensor signal and heater power.

Abstract translation: 一种装置包括：头部换能器，被配置为与磁记录介质相互作用;以及加热器，其被配置为热致动头部换能器。 在头部传感器处或附近的热传感器被配置成产生传感器信号。 电路耦合到加热器并且被配置为引起加热器功率的振荡。 加热器功率振荡导致传感器信号的振荡。 检测器耦合到热传感器并且被配置为使用振荡传感器信号和加热器功率检测头 - 介质接触。

公开(公告)号：US09548072B2

公开(公告)日：2017-01-17

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: G11B11/00 ,  G11B5/60 ,  G11B5/31 ,  G11B5/00 ,  G11B7/00 ,  G11B11/105

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。