公开(公告)号：US10240975B2

公开(公告)日：2019-03-26

申请号：US15190462

申请日：2016-06-23

Applicant: Seagate Technology LLC

Inventor： James Dillon Kiely ,  John Charles Duda ,  Patrick Carl Fletcher ,  Andrei Dorobantu ,  Jon D. Trantham

IPC: G01J1/42 ,  G01K7/16

Abstract: An apparatus comprises a light source configured to generate light, and a modulator coupled to the light source and configured to modulate the light above a predetermined frequency. A slider is configured for heat-assisted magnetic recording and to receive the modulated light. A resistive sensor is integral to the slider and subject to heating by absorption of electromagnetic radiation and conduction of heat. Measuring circuitry is coupled to the resistive sensor and configured to measure a response of the resistive sensor due to absorbed electromagnetic radiation and not from the heat conduction. The measuring circuitry may further be configured to determine output optical power of the light source using the measured resistive sensor response.

公开(公告)号：US10127940B1

公开(公告)日：2018-11-13

申请号：US15342339

申请日：2016-11-03

Applicant: Seagate Technology LLC

Inventor： James Gary Wessel ,  Jon Karsten Klarqvist ,  John Charles Duda

IPC: G11B5/02 ,  G11B7/13 ,  G01J5/22 ,  G01J1/42 ,  G11B5/48 ,  G11B5/00

Abstract: A slider configured for heat-assisted magnetic recording comprises an optical sensor coupled to first and second bond pads. The optical sensor comprises a bolometer and a reference sensor. The bolometer is situated at a location of the slider that receives at least some of the light and exposed to an ambient temperature at the slider. The bolometer produces a signal in response to a change in the ambient temperature and the change in output optical power. The reference sensor is situated at a location of the slider unexposed to the light and exposed to the ambient temperature. The reference sensor is coupled to the bolometer and configured to produce a signal in response to the change in the ambient temperature. The optical sensor is configured to generate a sensor signal indicative of changes in output optical power of a laser source without contribution due to ambient temperature changes.

公开(公告)号：US10002631B1

公开(公告)日：2018-06-19

申请号：US15631489

申请日：2017-06-23

Applicant: Seagate Technology LLC

Inventor： James Dillon Kiely ,  Zhen Wei ,  Neil Zuckerman ,  John Charles Duda ,  Eric L. Montei

IPC: G11B21/02 ,  G11B5/60

CPC classification number: G11B5/607 ,  G11B5/6076

Abstract: An apparatus comprising a slider and a detector coupled to the slider. The slider is configured for writing data to and reading data from a magnetic recording medium. The slider comprises a heater configured to receive a modulated signal and cause oscillation in a spacing between the slider and the medium. At least one heat generating component of the slider is configured to receive a modulated signal. A contact sensor is situated on the slider to receive heat generated by the at least one heat generating component. The detector is configured to measure a response signal of the heated contact sensor as the slider approaches the medium. The detector is further configured to detect contact between the slider and the medium in response to the response signal reaching a predetermined threshold.

公开(公告)号：US09978405B1

公开(公告)日：2018-05-22

申请号：US15444518

申请日：2017-02-28

Applicant: Seagate Technology LLC

Inventor： Zoran Jandric ,  Vasudevan Ramaswamy ,  Erik J. Hutchinson ,  John Charles Duda

IPC: G11B11/00 ,  G11B5/31 ,  G11B5/00 ,  G11B5/60 ,  G11B7/1267 ,  G11B7/1263 ,  G11B7/127

CPC classification number: G11B5/314 ,  G11B5/6005 ,  G11B5/6011 ,  G11B5/607 ,  G11B5/6076 ,  G11B5/6088 ,  G11B7/1263 ,  G11B7/1267 ,  G11B7/127 ,  G11B2005/0021

Abstract: A slider configured for heat-assisted magnetic recording comprises an air bearing surface (ABS), a writer, and a close point of the writer. A plurality of heat producing or dissipating components are situated a predetermined distance from a vertical plane that is normal to the ABS and aligned with the close point. A location of the writer close point remains substantially consistent irrespective of which of the plurality of heat producing or dissipating components are energized.

公开(公告)号：US20180122414A1

公开(公告)日：2018-05-03

申请号：US15657746

申请日：2017-07-24

Applicant: Seagate Technology LLC

Inventor： John Charles Duda ,  Zoran Jandric

IPC: G11B5/60 ,  G11B5/48 ,  G11B5/00

CPC classification number: G11B5/6082 ,  G11B5/314 ,  G11B5/455 ,  G11B5/4866 ,  G11B5/607 ,  G11B5/6076 ,  G11B5/6088 ,  G11B2005/0021

Abstract: An apparatus comprises a slider having an air bearing surface (ABS) and a near-field transducer (NFT) at or near the ABS. An optical waveguide is configured to couple light from a laser source to the NFT. A resistive sensor comprises an ABS section situated at or proximate the ABS and a distal section extending away from the ABS to a location at least lateral of or behind the NFT. The resistive sensor is configured to detect changes in output optical power of the laser source and contact between the slider and a magnetic recording medium.

公开(公告)号：US09911441B1

公开(公告)日：2018-03-06

申请号：US15381015

申请日：2016-12-15

Applicant: Seagate Technology LLC

Inventor： Zoran Jandric ,  Martin Blaber ,  Chubing Peng ,  John Charles Duda

IPC: G11B11/00 ,  G11B5/48 ,  G11B5/00 ,  G11B11/105 ,  G11B7/126

CPC classification number: G11B5/314 ,  G11B7/126 ,  G11B11/10506 ,  G11B11/1051 ,  G11B2005/0021

Abstract: A solid-immersion mirror has two reflective portions surrounding a focal region. A thermal sensor that senses temperature as a function of resistance is proximate at least one of the two reflective portions of the solid-immersion mirror. A near-field transducer is located proximate the focal region of the solid-immersion mirror. The near-field transducer directs optical energy to a magnetic recording medium.

公开(公告)号：US20170370770A1

公开(公告)日：2017-12-28

申请号：US15190462

申请日：2016-06-23

Applicant: Seagate Technology LLC

Inventor： James Dillon Kiely ,  John Charles Duda ,  Patrick Carl Fletcher ,  Andrei Dorobantu ,  Jon D. Trantham

IPC: G01J1/42

CPC classification number: G01J1/4257 ,  G01K7/16

Abstract: An apparatus comprises a light source configured to generate light, and a modulator coupled to the light source and configured to modulate the light above a predetermined frequency. A slider is configured for heat-assisted magnetic recording and to receive the modulated light. A resistive sensor is integral to the slider and subject to heating by absorption of electromagnetic radiation and conduction of heat. Measuring circuitry is coupled to the resistive sensor and configured to measure a response of the resistive sensor due to absorbed electromagnetic radiation and not from the heat conduction. The measuring circuitry may further be configured to determine output optical power of the light source using the measured resistive sensor response.

公开(公告)号：US09799361B1

公开(公告)日：2017-10-24

申请号：US15391125

申请日：2016-12-27

Applicant: Seagate Technology LLC

Inventor： John Charles Duda ,  James Gary Wessel

IPC: G11B5/02 ,  G11B5/60 ,  G11B5/00 ,  G11B5/48

CPC classification number: G11B5/6076 ,  G11B5/455 ,  G11B5/4866 ,  G11B5/6052 ,  G11B5/607 ,  G11B5/6088 ,  G11B2005/0021

Abstract: An apparatus comprises a slider and an optical waveguide formed in the slider and configured to receive light from a laser source. A near-field transducer (NFT) is formed on the slider at or near an air bearing surface (ABS) of the slider and optically coupled to the waveguide. A bolometric sensor is positioned proximate the NFT and exposed to at least some of the light. The bolometric sensor is configured to detect changes in output optical power of the laser source and contact between the slider and a magnetic recording medium.

公开(公告)号：US09728209B2

公开(公告)日：2017-08-08

申请号：US15163035

申请日：2016-05-24

Applicant: Seagate Technology LLC

Inventor： Weibin Chen ,  Martin Blaber ,  Tong Zhao ,  Michael Christopher Kautzky ,  John Charles Duda

IPC: G11B11/00 ,  G11B5/02 ,  G11B5/31 ,  G11B5/00

CPC classification number: G11B5/314 ,  G11B5/3116 ,  G11B5/3133 ,  G11B2005/0021

Abstract: A near-field transducer includes first and second stacked base portions having a common outline shape. The second base portion is proximate alight delivery structure. A peg extends from the first base portion towards a media-facing surface. The peg includes a material that is more thermally robust than a plasmonic material of the base portion. The peg has a peg thickness that is less than a thickness of the first base portion. The first base portion has a first recess proximate the peg. The first recess separates the first base portion from the media-facing surface and exposes at least a top side of the peg.

公开(公告)号：US09691424B2

公开(公告)日：2017-06-27

申请号：US15051053

申请日：2016-02-23

Applicant: Seagate Technology LLC

Inventor： John Charles Duda ,  Ruoxi Yang ,  James Gary Wessel

IPC: G11B11/00 ,  G11B5/60 ,  G11B5/31 ,  G11B5/00 ,  G11B11/105 ,  G11B11/12 ,  G11B11/14

CPC classification number: G11B11/10547 ,  G11B5/314 ,  G11B5/4866 ,  G11B5/6052 ,  G11B5/607 ,  G11B5/6082 ,  G11B5/6088 ,  G11B11/06 ,  G11B11/10532 ,  G11B11/10543 ,  G11B11/12 ,  G11B11/14 ,  G11B2005/0021

Abstract: An apparatus comprises a slider having an air-bearing surface (ABS), a write pole at or near the ABS, and a reader at or near the ABS and connected to a pair of reader bond pads of the slider. A near-field transducer (NFT) is formed on the slider at or near the ABS, and an optical waveguide is formed in the slider and configured to receive light from a laser source. A sensor is situated proximal of the write pole at a location within the slider that receives at least some of the light communicated along the waveguide. The sensor may be electrically coupled to the reader bond pads in parallel with the reader, and configured to generate a signal indicative of output optical power of the laser source.