公开(公告)号：US20240321305A1

公开(公告)日：2024-09-26

申请号：US18459152

申请日：2023-08-31

Applicant: Kabushiki Kaisha Toshiba ,  Toshiba Electronic Devices & Storage Corporation

Inventor： Masaya OHTAKE ,  Kaori KIMURA

IPC: G11B5/60 ,  G11B5/40

CPC classification number: G11B5/6011 ,  G11B5/40 ,  G11B2005/0021

Abstract: A magnetic recording and reproducing device includes a magnetic recording medium including a protective layer that is exposed to an enclosed interior volume of the magnetic recording and reproducing device, which contains oxygen and helium, a magnetic head including a heat assist element that is also exposed to the enclosed interior volume, the magnetic head configured to record data onto the magnetic recording medium, and an oxygen amount measurement unit configured to measure an oxygen amount in the enclosed interior volume.

公开(公告)号：US20240312479A1

公开(公告)日：2024-09-19

申请号：US18458923

申请日：2023-08-30

Applicant: Kabushiki Kaisha Toshiba ,  Toshiba Electronic Devices & Storage Corporation

Inventor： Masayuki KONDO

IPC: G11B5/008 ,  G11B5/49 ,  G11B5/58 ,  G11B5/596

CPC classification number: G11B5/00821 ,  G11B5/4961 ,  G11B5/581 ,  G11B5/59638 ,  G11B2005/0021

Abstract: According to one embodiment, a magnetic disk device which supplies, at the time of startup of data write or startup of data read, electric power higher than steady electric power used to make, in advance, spacing between a magnetic disk and a magnetic head become saturated at a target value to a heater of the magnetic head for a specified time and, after an elapse of the specified time, gradually reduces the electric power to be supplied to the heater of the magnetic head to the steady electric power.

公开(公告)号：US12057149B2

公开(公告)日：2024-08-06

申请号：US18322171

申请日：2023-05-23

Applicant: Western Digital Technologies, Inc.

Inventor： Takuya Matsumoto

IPC: G11B5/00 ,  G11B5/31 ,  G11B5/60 ,  G11B11/105 ,  G11B13/08

CPC classification number: G11B5/6088 ,  G11B5/314 ,  G11B11/10536 ,  G11B13/08 ,  G11B2005/0021

Abstract: A heat-assisted magnetic recording (HAMR) head has a slider with a gas-bearing-surface (GBS). The slider supports a near-field transducer (NFT) with an output tip at the GBS and a main magnetic pole with a pole tip at the GBS. The pole tip has a narrow cross-track width that can be substantially the same as the cross-track width of the NFT output tip. A plasmonic layer is located between the main pole and the NFT and has a tip at the GBS between the main pole tip and the NFT output tip. The plasmonic layer may also be located on the cross-track sides of the main pole and the main pole tip.

公开(公告)号：US12046265B1

公开(公告)日：2024-07-23

申请号：US18232128

申请日：2023-08-09

Applicant: WESTERN DIGITAL TECHNOLOGIES, INC.

Inventor： Guoxiao Guo ,  Erhard S. Schreck ,  William B. Boyle ,  Kei Yasuna

IPC: G11B5/02 ,  G11B5/54 ,  G11B5/596 ,  G11B5/00

CPC classification number: G11B5/596 ,  G11B2005/0021

Abstract: Various illustrative aspects are directed to a data storage device, comprising one or more disks; an actuator mechanism configured to position one or more heads proximate to a corresponding disk surface of the one or more disks; and one or more processing devices. The one or more processing devices are configured to: select a sector on the corresponding disk surface to which to write data, wherein the sector is selected in accordance with a data erosion mitigation pattern; and output, while the head is positioned proximate to a preceding sector that precedes the selected sector, a laser pre-bias current to a laser-generating component of the head, wherein the laser pre-bias current is sufficient to induce significant data erosion on the preceding sector.

公开(公告)号：US11996126B2

公开(公告)日：2024-05-28

申请号：US17957304

申请日：2022-09-30

Applicant: Headway Technologies, Inc.

Inventor： Koji Shimazawa ,  Shengyuan Wang ,  Yukinori Ikegawa

IPC: G11B5/31 ,  B82Y20/00 ,  G02B5/00 ,  G11B7/1387 ,  G11B5/00

CPC classification number: G11B5/314 ,  B82Y20/00 ,  G02B5/008 ,  G11B5/3163 ,  G11B7/1387 ,  G11B2005/0021

Abstract: The present embodiments relate to a heat-assisted magnetic recording (HAMR) write head with an iridium (Ir) film. The Ir film can include a body layer and a plasmon generator (PG) film comprising Iridium with a thin Ir seed layer. The Ir seed layer can be in direct contact with a dielectric (aluminum oxide). The thickness of the Ir film can be 40 nanometers or less including both a body layer and the seed layer. Incorporating Iridium as a material used for a PG can be a high surface plasmon efficient material with also being reliable under high temperature irradiation during a heat-assisted writing process.

公开(公告)号：US11961543B2

公开(公告)日：2024-04-16

申请号：US17898936

申请日：2022-08-30

Applicant: Seagate Technology LLC

Inventor： Karim Tatah ,  Mourad Benakli ,  James Gary Wessel

IPC: H01S5/06 ,  G11B5/02 ,  G11B5/09 ,  G11B5/40 ,  G11B5/455 ,  G11B7/1263 ,  H01S5/024 ,  H01S5/026 ,  H01S5/065 ,  H01S5/068 ,  G11B5/00 ,  H01S5/062

CPC classification number: G11B7/1263 ,  G11B5/02 ,  G11B5/09 ,  G11B5/40 ,  G11B5/455 ,  H01S5/0261 ,  H01S5/0612 ,  H01S5/0651 ,  H01S5/06804 ,  H01S5/06808 ,  G11B2005/0021 ,  H01S5/02453 ,  H01S5/0617 ,  H01S5/06216

Abstract: A method and apparatus provide for determining a temperature at a junction of a laser diode when the laser diode is operated in a lasing state that facilitates heat-assisted magnetic recording, comparing the junction temperature and an injection current supplied during the lasing state to stored combinations of junction temperature and injection current, and determining a likelihood of mode hopping occurring for the laser diode during the lasing state based on the comparison to stored combinations of junction temperature and injection current.

公开(公告)号：US11955147B1

公开(公告)日：2024-04-09

申请号：US18175443

申请日：2023-02-27

Applicant: Kabushiki Kaisha Toshiba ,  Toshiba Electronic Devices & Storage Corporation

Inventor： Takuya Matsumoto

IPC: G11B5/09 ,  G11B13/08 ,  G11B5/00

CPC classification number: G11B5/09 ,  G11B13/08 ,  G11B2005/0021

Abstract: According to one embodiment, a magnetic recording/reproducing device comprises a magnetic head including an assist element and configured to perform assist recording by applying assist power to the assist element, a rotation driver configured to perform rotation drive of the magnetic recording medium, a rotation number controller, and an assist power controller. The assist recording is performed under a first condition including a first rotation number and a first assist power, or under a second condition including a second rotation number which is different from the first rotation number and a second assist power which is different from the first assist power.

公开(公告)号：US20240112693A1

公开(公告)日：2024-04-04

申请号：US17957304

申请日：2022-09-30

Applicant: Headway Technologies, Inc.

Inventor： Koji Shimazawa ,  Shengyuan Wang ,  Yukinori Ikegawa

IPC: G11B5/31 ,  B82Y20/00 ,  G02B5/00 ,  G11B7/1387

CPC classification number: G11B5/314 ,  B82Y20/00 ,  G02B5/008 ,  G11B5/3163 ,  G11B7/1387 ,  G11B2005/0021

Abstract: The present embodiments relate to a heat-assisted magnetic recording (HAMR) write head with an iridium (Ir) film. The Ir film can include a body layer and a plasmon generator (PG) film comprising Iridium with a thin Ir seed layer. The Ir seed layer can be in direct contact with a dielectric (aluminum oxide). The thickness of the Ir film can be 40 nanometers or less including both a body layer and the seed layer. Incorporating Iridium as a material used for a PG can be a high surface plasmon efficient material with also being reliable under high temperature irradiation during a heat-assisted writing process.

公开(公告)号：US20240096368A1

公开(公告)日：2024-03-21

申请号：US17945747

申请日：2022-09-15

Applicant: Western Digital Technologies, Inc.

Inventor： Hua Yuan ,  Hoan Cong Ho ,  Paul Christopher Dorsey

IPC: G11B13/08 ,  G11B5/73

CPC classification number: G11B13/08 ,  G11B5/73917 ,  G11B2005/0021

Abstract: Various apparatuses, systems, methods, and media are disclosed to provide a heat-assisted magnetic recording (HAMR) medium. A magnetic recording medium includes a substrate, a heat sink layer on the substrate, and an underlayer on the heat sink layer. The underlayer includes an amount of an electrically conductive material between about 20 mole percent (mol %) and about 100 mol %. The magnetic recording medium further includes the plurality of magnetic recording layers on the underlayer. The plurality of magnetic recording layers includes a first magnetic recording layer that comprises FePt—Ag—X, wherein X is an oxide.

公开(公告)号：US20240096350A1

公开(公告)日：2024-03-21

申请号：US18175443

申请日：2023-02-27

Applicant: Kabushiki Kaisha Toshiba ,  Toshiba Electronic Devices & Storage Corporation

Inventor： Takuya MATSUMOTO

IPC: G11B5/09 ,  G11B13/08

CPC classification number: G11B5/09 ,  G11B13/08 ,  G11B2005/0021

Abstract: According to one embodiment, a magnetic recording/reproducing device comprises a magnetic head including an assist element and configured to perform assist recording by applying assist power to the assist element, a rotation driver configured to perform rotation drive of the magnetic recording medium, a rotation number controller, and an assist power controller. The assist recording is performed under a first condition including a first rotation number and a first assist power, or under a second condition including a second rotation number which is different from the first rotation number and a second assist power which is different from the first assist power.