公开(公告)号：US20210225397A1

公开(公告)日：2021-07-22

申请号：US17221945

申请日：2021-04-05

Applicant: Seagate Technology LLC

Inventor： Reyad Mehfuz ,  Aidan Dominic Goggin ,  Pierre Asselin ,  Christopher Neil Harvey

IPC: G11B5/48 ,  G11B5/31 ,  G11B5/60 ,  G02B6/122

Abstract: A write head includes an input coupler configured to receive light excited by a light source. A waveguide core is configured to receive light from the input coupler at a fundamental transverse electric (TE00) mode. The waveguide core has a first straight portion. The waveguide core has a mode converter portion comprising a branched portion extending from the first straight portion. The mode converter portion is configured to convert the light to a higher-order (TE10) mode, the mode converter portion spaced apart from the input coupler. The waveguide core has a second straight portion between the mode converter portion and a media-facing surface. The write head has a near-field transducer at the media-facing surface, the near-field transducer receiving the light at the TE10 mode from the waveguide and directing surface plasmons to a recording medium in response thereto.

公开(公告)号：US10734019B1

公开(公告)日：2020-08-04

申请号：US16528174

申请日：2019-07-31

Applicant: Seagate Technology LLC

Inventor： Christopher Neil Harvey ,  Aidan Dominic Goggin ,  Kelly Elizabeth Callan ,  John Bernard McGurk ,  Reyad Mehfuz

IPC: G11B11/105 ,  G11B5/48 ,  G02B6/126 ,  G02B6/136 ,  G02B6/132 ,  G02B6/122 ,  G11B7/1387 ,  G02B6/27 ,  G11B5/60 ,  G11B5/00

Abstract: An apparatus includes an input coupler configured to receive light excited by a light source. A near-field transducer (NFT) is positioned at a media-facing surface of a write head. A layered waveguide is positioned between the input coupler and the NFT and configured to receive the light output from the input coupler in a transverse electric (TE) mode and deliver the light to the NFT in a transverse magnetic (TM) mode. The layered waveguide comprises a first layer extending along a light-propagation direction. The first layer is configured to receive light from the input coupler. The first layer tapers from a first cross track width to a second cross track width where the second cross track width is narrower than the first cross track width. The layered waveguide includes a second layer that is disposed on the first layer. The second layer has a cross sectional area in a plane perpendicular to the light propagation direction that increases along the light propagation direction. The cross sectional area of the second layer is smaller proximate to the input coupler and larger proximate to the NFT. The layered waveguide includes an interface between the first layer and the second layer, the interface comprises a curve.

公开(公告)号：US12106771B2

公开(公告)日：2024-10-01

申请号：US18371146

申请日：2023-09-21

Applicant: Seagate Technology LLC

Inventor： Aidan Dominic Goggin ,  John Moloney ,  Reyad Mehfuz ,  Chuan Zhong ,  Christopher Neil Harvey

IPC: G11B5/48 ,  G11B13/08 ,  G11B5/00 ,  G11B5/60 ,  G11B11/105

CPC classification number: G11B13/08 ,  G11B5/4866 ,  G11B2005/0021 ,  G11B5/6088 ,  G11B11/105

Abstract: A recording head includes a channel waveguide that delivers light to a media-facing surface. A near-field transducer (NFT) is at an end of the channel waveguide and proximate to the media-facing surface. A laser including an active region has a longitudinal axis corresponding to a propagation direction of the channel waveguide. The active region includes a back facet and a front facet proximate the NFT. The front facet has a surface shape configured to suppress back reflection of the light.

公开(公告)号：US20240112696A1

公开(公告)日：2024-04-04

申请号：US18537957

申请日：2023-12-13

Applicant: Seagate Technology LLC

Inventor： Mark Anthony Gubbins ,  Christopher Neil Harvey ,  Aidan Dominic Goggin ,  Fadi El Hallak ,  Reshma Anamari Mohandas ,  Bryn John Howells ,  Scott Eugene Olson

IPC: G11B5/60 ,  G11B5/31 ,  G11B5/48 ,  G11B7/126 ,  G11B13/08

CPC classification number: G11B5/6088 ,  G11B5/314 ,  G11B5/4866 ,  G11B7/126 ,  G11B13/08 ,  G11B2005/0021

Abstract: A heat-assisted magnetic recording head includes a laser, a near-field transducer, a primary waveguide, a secondary waveguide, and a photodiode. The laser is configured to emit electromagnetic radiation. The near-field transducer is configured to focus and emit an optical near-field. The primary waveguide configured to receive the electromagnetic radiation and propagate the electromagnetic radiation toward and proximal to the near-field transducer. The secondary waveguide configured to receive a portion of the electromagnetic radiation from the primary waveguide. The photodiode configured to receive the portion of the electromagnetic radiation from the secondary waveguide and emit a signal that represents a magnitude of the electromagnetic radiation that the laser emits.

公开(公告)号：US11837256B1

公开(公告)日：2023-12-05

申请号：US17851367

申请日：2022-06-28

Applicant: Seagate Technology LLC

Inventor： Christopher Neil Harvey ,  Aidan Dominic Goggin ,  Chuan Zhong

IPC: G11B5/00 ,  G11B13/08 ,  G11B5/012 ,  G02B6/42

CPC classification number: G11B13/08 ,  G02B6/4206 ,  G11B5/012 ,  G11B2005/0021

Abstract: Described are heat assisted magnetic read-write heads that include a coupler, a waveguide, a transducer, and appurtenant structures, as well as related methods.

公开(公告)号：US11069376B1

公开(公告)日：2021-07-20

申请号：US17024234

申请日：2020-09-17

Applicant: Seagate Technology LLC

Inventor： John Bernard McGurk ,  Reyad Mehfuz ,  Christopher Neil Harvey ,  Aidan Dominic Goggin

IPC: G11B11/105 ,  G11B5/48 ,  G11B5/60 ,  G11B5/31 ,  G11B13/04 ,  G02B6/122 ,  G11B5/00

Abstract: An apparatus includes a substrate. A laser is formed on a non-self supporting structure and bonded to the substrate. A waveguide having a gap portion is deposited proximate the laser. The waveguide is configured to communicate light from the laser to a near-field transducer (NFT) that directs energy resulting from plasmonic excitation to a recording medium. An optical isolator is disposed over the gap portion.

公开(公告)号：US10971179B1

公开(公告)日：2021-04-06

申请号：US16433467

申请日：2019-06-06

Applicant: Seagate Technology LLC

Inventor： Reyad Mehfuz ,  Aidan Dominic Goggin ,  Pierre Asselin ,  Christopher Neil Harvey

IPC: G11B11/105 ,  G11B5/48 ,  G11B5/31 ,  G11B5/60 ,  G02B6/122 ,  G11B5/00

Abstract: A write head includes an input coupler configured to receive light excited by a light source. A waveguide core is configured to receive light from the input coupler at a fundamental transverse electric (TE00) mode. The waveguide core has a first straight portion. The waveguide core has a mode converter portion comprising a branched portion extending from the first straight portion. The mode converter portion is configured to convert the light to a higher-order (TE10) mode, the mode converter portion spaced apart from the input coupler. The waveguide core has a second straight portion between the mode converter portion and a media-facing surface. The write head has a near-field transducer at the media-facing surface, the near-field transducer receiving the light at the TE10 mode from the waveguide and directing surface plasmons to a recording medium in response thereto.

公开(公告)号：US11817119B2

公开(公告)日：2023-11-14

申请号：US17546855

申请日：2021-12-09

Applicant: Seagate Technology LLC

Inventor： Aidan Dominic Goggin ,  John Moloney ,  Reyad Mehfuz ,  Chuan Zhong ,  Christopher Neil Harvey

IPC: G11B5/105 ,  G11B5/48 ,  G11B13/08 ,  G11B5/60 ,  G11B5/00 ,  G11B11/105

CPC classification number: G11B13/08 ,  G11B5/4866 ,  G11B5/6088 ,  G11B11/105 ,  G11B2005/0021

Abstract: A recording head includes a channel waveguide that delivers light to a media-facing surface. A near-field transducer (NFT) is at an end of the channel waveguide and proximate to the media-facing surface. A laser including an active region has a longitudinal axis corresponding to a propagation direction of the channel waveguide. The active region includes a back facet and a front facet proximate the NFT. The front facet has a surface shape configured to suppress back reflection of the light.

公开(公告)号：US11227633B1

公开(公告)日：2022-01-18

申请号：US17082360

申请日：2020-10-28

Applicant: Seagate Technology LLC

Inventor： Aidan Dominic Goggin ,  John Moloney ,  Reyad Mehfuz ,  Chuan Zhong ,  Christopher Neil Harvey

IPC: G11B11/105 ,  G11B13/08 ,  G11B5/48 ,  G11B5/60 ,  G11B5/00

Abstract: A recording head includes a channel waveguide that delivers light to a media-facing surface. A near-field transducer (NFT) is at an end of the channel waveguide and proximate to the media-facing surface. A laser including an active region has a longitudinal axis corresponding to a propagation direction of the channel waveguide. The active region includes a back facet and a front facet proximate the NFT. The front facet has a surface shape configured to suppress back reflection of the light.

公开(公告)号：US10811043B2

公开(公告)日：2020-10-20

申请号：US16714919

申请日：2019-12-16

Applicant: Seagate Technology LLC

Inventor： Christopher Neil Harvey ,  Aidan Dominic Goggin ,  Kelly Elizabeth Callan ,  Reyad Mehfuz

IPC: G11B11/105 ,  G11B5/48 ,  G11B5/60 ,  G11B5/31 ,  G11B5/00 ,  G11B7/126

Abstract: An apparatus includes a first waveguide core extending along a light-propagation direction and configured to receive light from a light source at a combined transverse electric (TE) mode and a transverse magnetic (TM) mode. A second waveguide core is spaced apart from the first waveguide core and is configured to couple light at a TM mode to the second waveguide core. A near-field transducer (NFT) is disposed at a media-facing surface of a write head, the NFT receiving the light from the first waveguide core or the second waveguide core and heating a magnetic recording medium in response thereto.