公开(公告)号：US20220005498A1

公开(公告)日：2022-01-06

申请号：US17395291

申请日：2021-08-05

Applicant: Western Digital Technologies, Inc.

Inventor： Quang LE ,  Xiaoyong LIU ,  Zhigang BAI ,  Zhanjie LI ,  Kuok San HO ,  Hisashi TAKANO

IPC: G11B5/37 ,  H01L43/04 ,  H01L43/06 ,  G11B5/39 ,  H01L43/14

Abstract: The present disclosure generally relates to spin-orbital torque (SOT) differential reader designs. The SOT differential reader is a multi-terminal device that comprises a first shield, a first spin hall effect layer, a first free layer, a gap layer, a second spin hall effect layer, a second free layer, and a second shield. The gap layer is disposed between the first spin hall effect layer and the second spin hall effect layer. Electrical lead connections are located about the first spin hall effect layer, the second spin hall effect layer, the gap layer, the first shield, and/or the second shield. The electrical lead connections facilitate the flow of current and/or voltage from a negative lead to a positive lead. The positioning of the electrical lead connections and the positioning of the SOT differential layers improves reader resolution without decreasing the shield-to-shield spacing (i.e., read-gap).

公开(公告)号：US20210405131A1

公开(公告)日：2021-12-30

申请号：US16912500

申请日：2020-06-25

Applicant: Western Digital Technologies, Inc.

Inventor： Xiaoyong LIU ,  Quang LE ,  Zhigang BAI ,  Daniele MAURI ,  Zhanjie LI ,  Kuok San HO ,  Thao A. NGUYEN ,  Rajeev NAGABHIRAVA

IPC: G01R33/09 ,  G01R27/14

Abstract: The present disclosure generally relates to sensor device, such as a magnetic sensor bridge, that utilizes a dual free layer (DFL) structure. The device includes a plurality of resistors that each includes the same DFL structure. Adjacent the DFL structure is a magnetic structure that can include a permanent magnet, an antiferromagnetic (AFM) layer having a synthetic AFM (SAF) structure thereon, a permanent magnetic having a SAF structure thereon, or an AFM layer having a ferromagnetic layer thereon. The DFL structures are aligned with different layers of the magnetic structures to differentiate the resistors. The different alignment and/or different magnetic structures result in a decrease in production time due to reduced complexity and, thus, reduces costs.

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.

公开(公告)号：US20190251992A1

公开(公告)日：2019-08-15

申请号：US16276500

申请日：2019-02-14

Applicant: Western Digital Technologies, Inc.

Inventor： Michael Kuok San HO ,  Yunfei DING ,  Zhigang BAI ,  Yaguang WEI ,  Terence LAM ,  Goncalo BAIAO DE ALBUQUERQUE ,  Xinjiang SHEN ,  Feng Q. LIU

IPC: G11B5/73 ,  G11B5/23 ,  G11B5/11

Abstract: The present disclosure generally relates to a magnetic media drive employing a magnetic recording head. The head includes a main pole at a media facing surface (MFS), a trailing shield at the MFS, and a MAMR stack disposed between the main pole and the trailing shield at the MFS. The MAMR stack includes a seed layer and at least one magnetic layer. The seed layer is fabricated from a thermally conductive material having electrical resistivity lower than that of the main pole. The seed layer has a stripe height greater than a stripe height of the at least one magnetic layer. With the extended seed layer, the bias current from the trailing shield to the main pole spreads further away from the MFS along the extended seed layer before flowing into the main pole, reducing temperature rise at or near the MAMR stack, leading to improved write head reliability.