公开(公告)号：US20130286805A1

公开(公告)日：2013-10-31

申请号：US13797840

申请日：2013-03-12

Applicant: SEAGATE TECHNOLOGY LLC

Inventor： Declan Macken ,  James Dillon Kiely ,  Manuel Charles Anaya-Dufresne

IPC: G11B27/17

CPC classification number: G11B5/607 ,  G11B5/314 ,  G11B5/4866 ,  G11B5/6005 ,  G11B5/6011 ,  G11B5/6088 ,  G11B27/17 ,  G11B2005/0021

Abstract: An apparatus includes a near-field transducer at or near an air bearing surface of the apparatus. A write pole is disposed at or near the air bearing surface and proximate the near-field transducer, respectively. A thermal sensor is disposed at the air bearing surface and within a protrusion region of the air bearing surface defined relative to at least one of the near-field transducer and the write pole. The thermal sensor is configured to produce a signal indicative of a temperature at the protrusion region.

公开(公告)号：US10482908B2

公开(公告)日：2019-11-19

申请号：US16193189

申请日：2018-11-16

Applicant: Seagate Technology LLC

Inventor： Riyan Mendonsa ,  Jon D. Trantham ,  James Dillon Kiely ,  Peng Li ,  Joshua Ward Christensen

IPC: G11B11/105 ,  G11B5/455 ,  G11B5/60 ,  G11B5/00 ,  G11B7/126

Abstract: An apparatus comprises a laser diode configured to generate light during a write operation. A slider comprises a near-field transducer (NFT) and an optical waveguide. The slider is configured for heat-assisted magnetic recording and to communicate the light to the NFT via the waveguide. A writer heater of the slider is configured to receive power during the write operation. A thermal sensor is situated at or near an air bearing surface of the slider. The thermal sensor is configured to produce a sensor signal in response to sensing back-heating from the medium while the NFT generates heat during a write operation. Circuitry, coupled to the thermal sensor, is configured to compare the sensor signal to a threshold and generate an output signal indicative of degradation of NFT performance in response to the sensor signal exceeding the threshold.

公开(公告)号：US20190212192A1

公开(公告)日：2019-07-11

申请号：US16352243

申请日：2019-03-13

Applicant: Seagate Technology LLC

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

IPC: G01J1/42 ,  G01K7/16

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：US20190103132A1

公开(公告)日：2019-04-04

申请号：US16193189

申请日：2018-11-16

Applicant: Seagate Technology LLC

Inventor： Riyan Mendonsa ,  Jon D. Trantham ,  James Dillon Kiely ,  Peng Li ,  Joshua Ward Christensen

IPC: G11B5/455 ,  G11B5/60 ,  G11B5/00 ,  G11B7/126

Abstract: An apparatus comprises a laser diode configured to generate light during a write operation. A slider comprises a near-field transducer (NFT) and an optical waveguide. The slider is configured for heat-assisted magnetic recording and to communicate the light to the NFT via the waveguide. A writer heater of the slider is configured to receive power during the write operation. A thermal sensor is situated at or near an air bearing surface of the slider. The thermal sensor is configured to produce a sensor signal in response to sensing back-heating from the medium while the NFT generates heat during a write operation. Circuitry, coupled to the thermal sensor, is configured to compare the sensor signal to a threshold and generate an output signal indicative of degradation of NFT performance in response to the sensor signal exceeding the threshold.

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：US10204655B1

公开(公告)日：2019-02-12

申请号：US15784509

申请日：2017-10-16

Applicant: Seagate Technology LLC

Inventor： Minjie Ma ,  Tim Rausch ,  Edward Charles Gage ,  James Dillon Kiely ,  Paul M. Jones ,  Yang Yang

IPC: G11B11/00 ,  G11B21/10 ,  G11B5/00 ,  G11B7/126 ,  G11B7/1267 ,  G11B7/1263 ,  G11B5/60

Abstract: Data is written to data sectors of a heat-assisted magnetic recording (HAMR) medium using a laser of a HAMR head supplied with a sum of an operational current and a threshold current. A service current is supplied to the laser when the head is over servo sectors of the medium, such that a temperature of the medium at the servo sectors is greater than or equal to a temperature of the head when over the servo sectors.

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：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：US20150255098A1

公开(公告)日：2015-09-10

申请号：US14720276

申请日：2015-05-22

Applicant: Seagate Technology LLC

Inventor： Declan Macken ,  James Dillon Kiely

IPC: G11B5/48

CPC classification number: G11B5/4866 ,  G11B5/314 ,  G11B5/6076 ,  G11B5/6088 ,  G11B13/08 ,  G11B21/21 ,  G11B2005/0021

Abstract: An apparatus includes a writer, an arrangement comprising a plasmonic near-field transducer (NFT) adjacent the writer and comprising a material having a temperature coefficient of resistance (TCR), and a lead arrangement connected to the NFT arrangement. In some configurations, the NFT arrangement includes a heat sink, and the lead arrangement is connected to the heat sink. In other configurations, the lead arrangement is connected directly to the NFT.

公开(公告)号：US09042210B2

公开(公告)日：2015-05-26

申请号：US14038099

申请日：2013-09-26

Applicant: Seagate Technology LLC

Inventor： Declan Macken ,  James Dillon Kiely

IPC: G11B11/00 ,  G11B21/21 ,  G11B13/08 ,  G11B5/48

CPC classification number: G11B5/4866 ,  G11B5/314 ,  G11B5/6076 ,  G11B5/6088 ,  G11B13/08 ,  G11B21/21 ,  G11B2005/0021

Abstract: An apparatus includes a writer, an arrangement comprising a plasmonic near-field transducer (NFT) adjacent the writer and comprising a material having a temperature coefficient of resistance (TCR), and a lead arrangement connected to the NFT arrangement. In some configurations, the NFT arrangement includes a heat sink, and the lead arrangement is connected to the heat sink. In other configurations, the lead arrangement is connected directly to the NFT.