公开(公告)号：US10249335B2

公开(公告)日：2019-04-02

申请号：US15713023

申请日：2017-09-22

Applicant: Seagate Technology LLC

Inventor： Randall Victora ,  Zengyuan Liu ,  Pin-wei Huang ,  Ganping Ju ,  Jan-Ulrich Thiele

IPC: G11B5/66 ,  G11B17/028 ,  G11B5/65 ,  G11B5/012 ,  G11B5/127 ,  G11B5/00

Abstract: A heat-assisted magnetic recording media structure with exchange-coupled composite layer structure may be utilized in a data storage device. The heat-assisted magnetic recording disk structure can have a FePt-based layer as a storage layer and a FePt-based or a CoPt-based magnetic layer with higher Curie temperature as a write layer. The interface between the write layer and the storage layer may be separated by an exchange control layer. The composite structure can be optimized to reduce jitter for high density data storage by tuning the exchange coupling between the write layer and storage layer.

公开(公告)号：US11341990B1

公开(公告)日：2022-05-24

申请号：US17330547

申请日：2021-05-26

Applicant: Seagate Technology LLC

Inventor： Zengyuan Liu ,  Edward Charles Gage ,  Tim Rausch ,  Stephanie Hernandez

IPC: G11B5/245 ,  G11B5/39 ,  G11B5/00

Abstract: A recording head for writing data on tracks of a data storage medium is provided. The recording head includes a writer having a write pole and a trailing shield. The write pole includes a pole tip configured to write on the tracks of the data storage medium. The recording head also includes first and second writing-assistance wires positioned between the pole tip and the trailing shield in a down-track direction to enable a writing-assistance current to be provided to produce an assist magnetic field that augments a write field produced by the write pole.

公开(公告)号：US11049515B1

公开(公告)日：2021-06-29

申请号：US16870538

申请日：2020-05-08

Applicant: Seagate Technology LLC

Inventor： Zengyuan Liu ,  Edward Charles Gage ,  Tim Rausch ,  Stephanie Hernandez

IPC: G11B5/245 ,  G11B5/39 ,  G11B5/00

Abstract: A recording head for writing data on tracks of a data storage medium is provided. The recording head includes a writer having a write pole and a trailing shield. The write pole includes a pole tip configured to write on the tracks of the data storage medium. The recording head also includes first and second writing-assistance wires positioned between the pole tip and the trailing shield in a down-track direction to enable a writing-assistance current to be provided to produce an assist magnetic field that augments a write field produced by the write pole.

公开(公告)号：US10706876B1

公开(公告)日：2020-07-07

申请号：US16440306

申请日：2019-06-13

Applicant: Seagate Technology LLC

Inventor： Tim Rausch ,  Edward Charles Gage ,  Zengyuan Liu

IPC: G11B5/127 ,  G11B5/31 ,  G11B11/105 ,  G11B5/00

Abstract: A recording head for writing data on tracks of a data storage medium. The recording head includes a writer having a write pole and a trailing shield. The write pole includes a pole tip configured to write on the tracks of the data storage medium. The recording head also includes a writing-assistance wire that is positioned between the pole tip and the trailing shield in a down-track direction.

公开(公告)号：US12073862B2

公开(公告)日：2024-08-27

申请号：US18181458

申请日：2023-03-09

Applicant: Seagate Technology LLC

Inventor： Thomas Young Chang ,  Philip L. Steiner ,  Zengyuan Liu

IPC: G11B5/73 ,  G11B5/008 ,  G11B5/02 ,  G11B5/00

CPC classification number: G11B5/7366 ,  G11B5/00813 ,  G11B5/02 ,  G11B2005/0021

Abstract: A heat-assisted magnetic recording (HAMR) device is configured to write regions of neutral polarity on a magnetic media during a same pass of the recording head in which other regions are written of positive polarity and negative polarity. The various disclosed write techniques may facilitate creation of “zero state” (substantially net zero polarity) transition zones between each pair of data bits of opposite polarity and/or may facilitate the encoding of three different logical states (e.g., 1, 0, and −1) on the media.

公开(公告)号：US11626136B1

公开(公告)日：2023-04-11

申请号：US17565188

申请日：2021-12-29

Applicant: Seagate Technology LLC

Inventor： Thomas Young Chang ,  Philip L. Steiner ,  Zengyuan Liu

IPC: G11B5/31 ,  G11B20/12 ,  G11B13/08 ,  G11B5/012 ,  G11B5/00

Abstract: A heat-assisted magnetic recording (HAMR) device is configured to write regions of neutral polarity on a magnetic media during a same pass of the recording head in which other regions are written of positive polarity and negative polarity. The various disclosed write techniques may facilitate creation of “zero state” (substantially net zero polarity) transition zones between each pair of data bits of opposite polarity and/or may facilitate the encoding of three different logical states (e.g., 1, 0, and −1) on the media.

公开(公告)号：US11626134B1

公开(公告)日：2023-04-11

申请号：US17565221

申请日：2021-12-29

Applicant: Seagate Technology LLC

Inventor： Thomas Young Chang ,  Philip L. Steiner ,  Zengyuan Liu

IPC: G11B5/73 ,  G11B5/008 ,  G11B5/02 ,  G11B5/00

Abstract: A heat-assisted magnetic recording (HAMR) device is configured to write regions of neutral polarity on a magnetic media during a same pass of the recording head in which other regions are written of positive polarity and negative polarity. The various disclosed write techniques may facilitate creation of “zero state” (substantially net zero polarity) transition zones between each pair of data bits of opposite polarity and/or may facilitate the encoding of three different logical states (e.g., 1, 0, and −1) on the media.

公开(公告)号：US20180082713A1

公开(公告)日：2018-03-22

申请号：US15713023

申请日：2017-09-22

Applicant: Seagate Technology LLC

Inventor： Randall Victora ,  Zengyuan Liu ,  Pin-wei Huang ,  Ganping Ju ,  Jan-Ulrich Thiele

IPC: G11B17/028 ,  G11B5/66 ,  G11B5/65

CPC classification number: G11B5/66 ,  G11B5/012 ,  G11B5/1278 ,  G11B5/65 ,  G11B17/028 ,  G11B2005/0021 ,  G11B2220/23

Abstract: A heat-assisted magnetic recording media structure with exchange-coupled composite layer structure may be utilized in a data storage device. The heat-assisted magnetic recording disk structure can have a FePt-based layer as a storage layer and a FePt-based or a CoPt-based magnetic layer with higher Curie temperature as a write layer. The interface between the write layer and the storage layer may be separated by an exchange control layer. The composite structure can be optimized to reduce jitter for high density data storage by tuning the exchange coupling between the write layer and storage layer.