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：US20130083429A1

公开(公告)日：2013-04-04

申请号：US13686568

申请日：2012-11-27

Applicant: SEAGATE TECHNOLOGY LLC

Inventor： Declan Macken ,  Eric Walter Singleton ,  Peter Jeremy Czoschke

IPC: G11B5/127

CPC classification number: G11B5/127 ,  G11B5/1278 ,  G11B5/3133 ,  G11B2005/0008

Abstract: A magnetic writer includes a write element having a first domain pattern when in a quiescent state and a second domain pattern when in an active state. A biasing structure is configured to induce the write element into the first domain pattern when the magnetic writer is in the quiescent state.

Abstract translation: 磁性写入器包括当处于静止状态时具有第一域图案的写元件和处于活动状态时的第二域图案。 偏置结构被配置为当磁性写入器处于静止状态时将写入元件引入第一域图案。

公开(公告)号：US20200265865A1

公开(公告)日：2020-08-20

申请号：US16854403

申请日：2020-04-21

Applicant: Seagate Technology LLC

Inventor： Erik Jon Hutchinson ,  Declan Macken ,  Manuel Charles Anaya-Dufresne

IPC: G11B5/31 ,  G11B5/48 ,  G11B5/60

Abstract: An apparatus comprises a slider having an air bearing surface (ABS), a leading edge, and a trailing edge opposing the leading edge. A writer having a write pole is situated at or near the ABS. A near-field transducer (NFT) is situated at or near the ABS and between the write pole and the leading edge of the slider. An optical waveguide is configured to couple light from a laser source to the NFT. A contact sensor is situated between the write pole and the trailing edge. The contact sensor comprises a first ABS section situated at or near the ABS, a second ABS section situated at or near the ABS and spaced apart from the first ABS in a cross-track direction by a gap, and a distal section extending away from the ABS and connecting the first ABS section with the second ABS section.

公开(公告)号：US10580444B1

公开(公告)日：2020-03-03

申请号：US16272448

申请日：2019-02-11

Applicant: Seagate Technology LLC

Inventor： Declan Macken ,  Jon Kartsen Klarqvist

IPC: G11B5/09 ,  G11B5/60 ,  G11B5/48 ,  G11B5/00

Abstract: A slider of a heat-assisted magnetic recording head comprises an air bearing surface and an optical waveguide configured to receive light from a laser source. The slider comprises a plurality of electrical bond pads including a first bond pad and a second bond pad. A first resistive sensor is configured to sense for spacing changes and contact between the slider and a magnetic recording medium at or near a first close point of the slider. A second resistive sensor is configured to sense for spacing changes and contact between the slider and the medium at or near a second close point of the slider. A bolometer is situated at a location within the slider that receives at least some of the light communicated along the optical waveguide. The first resistive sensor, the second resistive sensor, and the bolometer are coupled together and between the first and second bond pads.

公开(公告)号：US10410660B1

公开(公告)日：2019-09-10

申请号：US16134021

申请日：2018-09-18

Applicant: Seagate Technology LLC

Inventor： Erik Jon Hutchinson ,  Declan Macken ,  Manuel Charles Anaya-Dufresne

IPC: G11B11/105 ,  G11B5/31 ,  G11B5/48 ,  G11B5/60 ,  G11B5/00

Abstract: An apparatus comprises a slider having an air bearing surface (ABS), a leading edge, and a trailing edge opposing the leading edge. A writer having a write pole is situated at or near the ABS. A near-field transducer (NFT) is situated at or near the ABS and between the write pole and the leading edge of the slider. An optical waveguide is configured to couple light from a laser source to the NFT. A contact sensor is situated between the write pole and the trailing edge. The contact sensor comprises a first ABS section situated at or near the ABS, a second ABS section situated at or near the ABS and spaced apart from the first ABS in a cross-track direction by a gap, and a distal section extending away from the ABS and connecting the first ABS section with the second ABS section.

公开(公告)号：US10229706B1

公开(公告)日：2019-03-12

申请号：US15960100

申请日：2018-04-23

Applicant: Seagate Technology LLC

Inventor： Declan Macken ,  Jon Karsten Klarqvist

IPC: G11B5/09 ,  G11B5/60 ,  G11B5/48 ,  G11B5/00

Abstract: A slider of a heat-assisted magnetic recording head comprises an air bearing surface and an optical waveguide configured to receive light from a laser source. The slider comprises a plurality of electrical bond pads including a first bond pad and a second bond pad. A first resistive sensor is configured to sense for spacing changes and contact between the slider and a magnetic recording medium at or near a first close point of the slider. A second resistive sensor is configured to sense for spacing changes and contact between the slider and the medium at or near a second close point of the slider. A bolometer is situated at a location within the slider that receives at least some of the light communicated along the optical waveguide. The first resistive sensor, the second resistive sensor, and the bolometer are coupled together and between the first and second bond pads.

公开(公告)号：US10192578B1

公开(公告)日：2019-01-29

申请号：US16049331

申请日：2018-07-30

Applicant: Seagate Technology LLC

Inventor： Declan Macken ,  Tyler Lenn Perry ,  Karim Tatah ,  Andrei Dorobantu ,  Todd Michael Lammers

IPC: G11B5/00 ,  G11B7/1263 ,  G11B5/09 ,  G11B20/18 ,  G11B5/012

Abstract: A slider configured for heat-assisted magnetic recording includes a laser diode optically coupled to a waveguide of the slider. A power supply is coupled to the laser diode. A preamplifier is coupled to the power supply. The preamplifier is configured to monitor a forward voltage across the laser diode while operating the laser diode at a constant current during a write operation, detect a change in the forward voltage indicative of laser power instability, and generate a signal in response to detecting the forward voltage change.

公开(公告)号：US10176832B2

公开(公告)日：2019-01-08

申请号：US15869361

申请日：2018-01-12

Applicant: Seagate Technology LLC

Inventor： Jason Bryce Gadbois ,  Declan Macken ,  Karsten Klarqvist

IPC: G11B5/48 ,  G11B5/49 ,  G11B5/00

Abstract: A bond pad set includes at least one ground pad and at least one electrical bond pad configured to bias and send/receive signals. The bond pad set is electrically connected to a multiplicity of electrical components. At least one electrical bond pad of the bond pad set is shared between two or more of the electrical components.

公开(公告)号：US09812159B1

公开(公告)日：2017-11-07

申请号：US15443344

申请日：2017-02-27

Applicant: Seagate Technology LLC

Inventor： Declan Macken

IPC: G11B21/02 ,  G11B5/48 ,  G11B5/00

CPC classification number: G11B5/4853 ,  G11B5/607 ,  G11B5/6076 ,  G11B2005/0021

Abstract: A slider of a magnetic recording head includes a plurality of electrical bond pads and a plurality of readers comprising at least a first reader and a second reader. Each of the readers is coupled to a different pair of electrical bond pads. A temporary contact sensor is provided on the slider and coupled between a bond pad of the first reader and a bond pad of the second reader. The temporary contact sensor is configured for operation during a certification process of the apparatus and to become inoperable after completion of the certification process.

公开(公告)号：US09812158B1

公开(公告)日：2017-11-07

申请号：US15370985

申请日：2016-12-06

Applicant: Seagate Technology LLC

Inventor： Narayanan Ramakrishnan ,  Declan Macken

IPC: G11B5/48 ,  G11B5/00

CPC classification number: G11B5/4853 ,  G11B5/607 ,  G11B5/6076 ,  G11B2005/0021

Abstract: A slider of a magnetic recording head comprises a plurality of electrical bond pads coupled to bias sources and a ground pad. Each of a plurality of electrical components of the slider is coupled one or more of the electrical bond pads, wherein at least one of the electrical bond pads is a shared electrical bond pad coupled to at least a first electrical component and a second electrical component. A switching transistor is coupled to the first and second components and the ground pad. The switching transistor is arranged to control powering of the second component in response to biasing of the first component.