公开(公告)号：US20230311268A1

公开(公告)日：2023-10-05

申请号：US18199526

申请日：2023-05-19

Applicant: Seagate Technology LLC

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

IPC: B24B37/04 ,  G11B5/31

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：US09042050B2

公开(公告)日：2015-05-26

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: G11B21/02 ,  G11B20/10 ,  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.

公开(公告)号：US20140347760A1

公开(公告)日：2014-11-27

申请号：US14457678

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.

公开(公告)号：US08837070B1

公开(公告)日：2014-09-16

申请号：US13867756

申请日：2013-04-22

Applicant: Seagate Technology LLC

Inventor： Michael Thomas Johnson ,  Pablo G. Levi

IPC: G11B5/02 ,  G11B21/12

CPC classification number: G11B5/6017

Abstract: A modulated signal of a predetermined frequency is applied to a capacitive sensor of a magnetic head. The capacitive sensor is located proximate to a media-facing surface of the magnetic head. A clearance between the magnetic head and a magnetic medium is determined using a response to the modulated signal at the predetermined frequency.

Abstract translation: 将预定频率的调制信号施加到磁头的电容式传感器。 电容传感器位于靠近磁头的面向媒体的表面上。 使用对预定频率的调制信号的响应来确定磁头和磁介质之间的间隙。

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：US09679598B2

公开(公告)日：2017-06-13

申请号：US14836010

申请日：2015-08-26

Applicant: Seagate Technology LLC

Inventor： Peng Peng ,  Declan Macken ,  Michael Thomas Johnson ,  Zheying Guo

IPC: G11B5/31 ,  G11B5/127 ,  G11B5/60

CPC classification number: G11B5/6076 ,  G11B5/1278 ,  G11B5/3133 ,  G11B5/3143 ,  G11B5/607

Abstract: A writer core of a transducer is configured to interact with a magnetic recording medium and comprises an upper core and a lower core. At least one of the upper and lower cores comprises a return pole having a return shield. The apparatus also comprises a writer pole between the upper and lower cores, and a writer gap defined between the writer pole and the return shield. The apparatus further comprises a sensor element within one of the upper and lower cores that includes the writer gap. The sensor element has a temperature coefficient of resistance and is configured to sense for a change in temperature indicative of one or both of a change in spacing and contact between the transducer and the magnetic recording medium.

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：US09202499B2

公开(公告)日：2015-12-01

申请号：US13802386

申请日：2013-03-13

Applicant: Seagate Technology LLC

Inventor： James Dillon Kiely ,  Karl Scheppers ,  Declan Macken ,  Michael Thomas Johnson

IPC: G11B5/60 ,  G11B5/31 ,  G11B5/00

CPC classification number: G11B5/6076 ,  G11B5/3116 ,  G11B5/3133 ,  G11B5/3136 ,  G11B5/314 ,  G11B5/607 ,  G11B5/6088 ,  G11B2005/0021

Abstract: An apparatus is arranged to detect contact between an air bearing surface of a transducer and a medium using a modulated thermal sensor signal. A laser source produces modulated laser light. A thermal sensor is disposed at or near the air bearing surface and is subject to cyclic heating by the modulated laser light. The thermal sensor is configured to produce the modulated sensor signal in response to the cyclic heating.

Abstract translation: 一种装置被布置成使用调制的热传感器信号检测换能器的空气轴承表面和介质之间的接触。 激光源产生调制激光。 热传感器设置在空气轴承表面上或附近，并且通过调制的激光进行循环加热。 热传感器被配置为响应于循环加热产生调制的传感器信号。

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：US08873352B1

公开(公告)日：2014-10-28

申请号：US14206683

申请日：2014-03-12

Applicant: Seagate Technology LLC

Inventor： Zoran Jandric ,  Chris Rea ,  Pierre Asselin ,  Michael Thomas Johnson ,  Manuel Charles Anaya-Dufresne ,  John C. Duda

IPC: G11B11/00

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

Abstract: An apparatus has a near-field transducer located proximate a media-facing surface of a slider magnetic recording heat. A waveguide is configured to couple light to the near-field transducer and includes a top cladding layer facing the near-field transducer, a bottom cladding layer, and a core layer between the top and bottom cladding layers. The apparatus includes a write pole with a flat portion substantially parallel to the core layer and a sloped portion extending from the flat portion of the write pole towards the media-facing surface at an angle to the core layer and to the media-facing surface. A light mitigation layer is located between the top cladding layer and the write pole.

Abstract translation: 一种装置具有靠近滑块磁记录热的面向介质表面的近场换能器。 波导被配置为将光耦合到近场换能器并且包括面向近场换能器的顶部覆层，底部包层以及在顶部和底部包层之间的芯层。 该装置包括具有基本上平行于芯层的平坦部分的写入极和从写入极的平坦部分朝着与介质相对的表面以与芯层成一定角度延伸到介质面向表面的倾斜部分。 光缓解层位于顶包层和写柱之间。