公开(公告)号：US20200327900A1

公开(公告)日：2020-10-15

申请号：US16911143

申请日：2020-06-24

Applicant: Western Digital Technologies, Inc.

Inventor： Zhigang BAI ,  Alexander TARATORIN ,  Anna ZHENG ,  Venkatesh CHEMBROLU ,  Supradeep NARAYANA ,  Suping SONG ,  Yaguang WEI ,  Terence LAM ,  Michael Kuok San HO ,  Changqing SHI ,  Lijie GUAN

IPC: G11B5/31 ,  G11B5/147 ,  G11B5/23 ,  G11B5/127 ,  G11B5/235

Abstract: A magnetic recording write head has an electrically-conductive structure in the write gap between the write pole and the trailing shield and electrical circuitry for directing current through the write gap. The current through the electrically-conductive structure generates a circular Ampere field which, at the disk-facing end of the write pole, is substantially parallel to the disk-facing end of the write pole. The electrically-conductive structure in the write gap may be a STO or an electrically-conductive layer that is not part of a STO. The current direction through the electrically-conductive structure in the write gap is selected so that the generated Ampere field at the write pole end is in substantially the same direction as the magnetization direction of the write head side shields, which has been discovered to result in minimization of cross-track interference.

公开(公告)号：US20230178104A1

公开(公告)日：2023-06-08

申请号：US17541794

申请日：2021-12-03

Applicant: Western Digital Technologies, Inc.

Inventor： Yingjian CHEN ,  Yonghua CHEN ,  Anna ZHENG ,  Zhanjie LI ,  Yi WANG ,  Jian Xiang SHEN ,  Lijie GUAN

IPC: G11B5/39

CPC classification number: G11B5/3912

Abstract: The present disclosure generally relates to magnetic recording devices with stable magnetization. The magnetic recording device comprises a lower leading shield, an upper leading shield disposed on the lower leading shield, a main pole disposed above the upper leading shield, a trailing shield disposed above the main pole and upper leading shield, and an upper return pole disposed above the trailing shield. A first non-magnetic layer is disposed between the lower leading shield and the upper leading shield, and a second non-magnetic layer is disposed between the trailing shield and the upper return pole. The lower leading shield has a different domain state than the upper leading shield, and the trailing shield and the upper leading shield have a same domain state. The materials and thickness of the first and second non-magnetic layers result in magnetostatic coupling or anti-ferromagnetic coupling.

公开(公告)号：US20190267029A1

公开(公告)日：2019-08-29

申请号：US16277947

申请日：2019-02-15

Applicant: Western Digital Technologies, Inc.

Inventor： Zhigang BAI ,  Alexander TARATORIN ,  Anna ZHENG ,  Venkatesh CHEMBROLU ,  Supradeep NARAYANA ,  Suping SONG ,  Yaguang WEI ,  Terence LAM ,  Michael Kuok San HO ,  Changqing SHI ,  Lijie GUAN

IPC: G11B5/147 ,  G11B5/31 ,  G11B5/23

Abstract: A magnetic recording write head has an electrically-conductive structure in the write gap between the write pole and the trailing shield and electrical circuitry for directing current through the write gap. The current through the electrically-conductive structure generates a circular Ampere field which, at the disk-facing end of the write pole, is substantially parallel to the disk-facing end of the write pole. The electrically-conductive structure in the write gap may be a STO or an electrically-conductive layer that is not part of a STO. The current direction through the electrically-conductive structure in the write gap is selected so that the generated Ampere field at the write pole end is in substantially the same direction as the magnetization direction of the write head side shields, which has been discovered to result in minimization of cross-track interference.

公开(公告)号：US20210125631A1

公开(公告)日：2021-04-29

申请号：US17141068

申请日：2021-01-04

Applicant: Western Digital Technologies, Inc.

Inventor： Zhigang BAI ,  Anna ZHENG ,  Venkatesh CHEMBROLU ,  Supradeep NARAYANA ,  Yaguang WEI ,  Suping SONG ,  Terence LAM ,  Michael Kuok San HO ,  Changqing SHI ,  Lijie GUAN ,  Jian-Gang ZHU

IPC: G11B5/115 ,  G11B5/31

Abstract: A magnetic head includes a main pole configured to serve as a first electrode, an upper pole containing a trailing magnetic shield configured to a serve as a second electrode, and an electrically conductive portion located in a trailing gap between the main pole and the trailing magnetic shield. The electrically conductive portion is not part of a spin torque oscillator stack, and the electrically conductive portion includes at least one electrically conductive, non-magnetic material layer. The main pole and the trailing magnetic shield are electrically shorted by the electrically conductive portion across the trailing gap between the main pole and the trailing magnetic shield such that an electrically conductive path is present between the main pole and the trailing magnetic shield through the electrically conductive portion.