公开(公告)号：US20240144964A1

公开(公告)日：2024-05-02

申请号：US18408014

申请日：2024-01-09

Applicant: Western Digital Technologies, Inc.

Inventor： Alexander GONCHAROV ,  Muhammad ASIF BASHIR ,  Petrus Antonius VAN DER HEIJDEN ,  Yunfei DING ,  Zhigang BAI ,  James Terrence OLSON

IPC: G11B5/31 ,  G11B5/23

CPC classification number: G11B5/3116 ,  G11B5/23

Abstract: The present disclosure is generally related to a magnetic recording device comprising a magnetic recording head having a first current flow in a cross-track direction through a trailing shield. In one or more embodiments, a second current flows in a cross-track direction around the main pole. The magnetic recording device comprises a main pole disposed between a trailing shield, a leading shield, and side shields. A trailing gap is disposed between the side shields and the trailing shield. A high moment seed layer is disposed between the main pole and the trailing shield. A first insulation layer is disposed within the trailing shield and directs the first current through the trailing shield, guided to the proximity of the main pole. A second insulation layer, disposed below the trailing shield, directs the second current through the trailing shield, or alternatively through the side shields and around the main pole.

公开(公告)号：US20210158839A1

公开(公告)日：2021-05-27

申请号：US17001593

申请日：2020-08-24

Applicant: Western Digital Technologies, Inc.

Inventor： Thao A. NGUYEN ,  Michael Kuok San HO ,  Zhigang BAI ,  Zhanjie LI ,  Quang LE

IPC: G11B5/09 ,  G11B5/31 ,  G11B5/187 ,  G11B5/60 ,  G11B5/40 ,  G11B5/23

Abstract: The present disclosure generally relates to a magnetic media drive employing a magnetic recording head. The magnetic recording head comprises a first write head, a second write head, at least one read head, and a thermal fly height control element. The first write head is a wide writing write head comprising a first main pole and a first trailing shield. The second write head a narrow writing write head comprising a second main pole, a trailing gap, a second trailing shield, and one or more side shields. The first main pole has a shorter height and a greater width than the second main pole. The second main pole has a curved or U-shaped surface disposed adjacent to the trailing gap. The thermal fly height control element and the at least one read head are aligned with a center axis of the second main pole of the second write head.

公开(公告)号：US20200349968A1

公开(公告)日：2020-11-05

申请号：US16932468

申请日：2020-07-17

Applicant: Western Digital Technologies, Inc.

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

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

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.

公开(公告)号：US20250087235A1

公开(公告)日：2025-03-13

申请号：US18959957

申请日：2024-11-26

Applicant: Western Digital Technologies, Inc.

Inventor： Muhammad ASIF BASHIR ,  Alexander GONCHAROV ,  Zhigang BAI ,  Masato SHIIMOTO ,  Yunfei DING

IPC: G11B5/31 ,  G11B5/00 ,  G11B5/127 ,  G11B5/235

Abstract: The present disclosure is generally related to a magnetic recording device comprising a magnetic recording head. The magnetic recording head comprises a main pole, a hot seed layer, and a spintronic device disposed between the main pole and the hot seed layer. The spintronic device comprises two field generation layers (FGLs), two spin polarization layers (SPLs), and two spin kill layers. The second SPL of the spintronic device drives the second FGL. The spintronic device further comprises one or more optional thin negative beta material layers, such as layers comprising FeCr, disposed in contact with at least one of the spin kill layers. When electric current is applied, the spin kill layers and optional negative beta material layers eliminate or reduce any spin torque between the FGLs and the SPLs.

公开(公告)号：US20200381011A1

公开(公告)日：2020-12-03

申请号：US16995656

申请日：2020-08-17

Applicant: Western Digital Technologies, Inc.

Inventor： Muhammad ASIF BASHIR ,  Yaguang WEI ,  Petrus Antonius VAN DER HEIJDEN ,  Xinjiang SHEN ,  Terence LAM ,  Zhigang BAI ,  Youfeng ZHENG ,  Changqing SHI ,  Michael Kuok San HO ,  Jian-Gang ZHU ,  Lijie GUAN ,  Venkatesh CHEMBROLU

IPC: G11B5/11 ,  G11B5/187

Abstract: Embodiments of the present disclosure generally relate to data storage devices, and more specifically, to storage devices employing an energy-assisted magnetic recording write head. The write head may comprise a main pole, a trailing shield, a conducting gap disposed between the main pole and the trailing shield, and one or more current blockers. The conducting gap may be conformal with the main pole. The one or more current blockers may be configured to direct the current from the main pole to the trailing shield through the conducting gap. The one or more current blockers may be further configured to recess the conducting gap away from the media facing surface. The one or more current blockers may be configured to direct the current away from a media facing surface of the write head.

公开(公告)号：US20250166658A1

公开(公告)日：2025-05-22

申请号：US18511235

申请日：2023-11-16

Applicant: Western Digital Technologies, Inc.

Inventor： Muhammad ASIF BASHIR ,  Yunfei DING ,  Zhigang BAI ,  Alexander GONCHAROV ,  Aron PENTEK

IPC: G11B5/60 ,  G11B5/00

Abstract: The present disclosure generally relates to a magnetic recording system comprising a magnetic recording head that provides a low resistance cross-track current path at the trailing side of the main pole. A bias current may be driven through the path to enhance the magnetic write field to the magnetic recording media. The current is driven by an alternating current (AC) source external to the head. In some embodiments, the cross-track current going through the low resistance path enables high amounts of current to be utilized without break down of the magnetic recording head.

公开(公告)号：US20240112694A1

公开(公告)日：2024-04-04

申请号：US18540472

申请日：2023-12-14

Applicant: Western Digital Technologies, Inc.

Inventor： Muhammad ASIF BASHIR ,  Petrus Antonius VAN DER HEIJDEN ,  James Terrence OLSON ,  Alexander GONCHAROV ,  Zhigang BAI ,  Yunfei DING

IPC: G11B5/31

CPC classification number: G11B5/315 ,  G11B5/3116

Abstract: Aspects of the present disclosure generally relate to a magnetic recording head assembly that includes an external alternating current (AC) source. A magnetic recording head of the magnetic recording head assembly includes a conductive structure between a main pole and a trailing shield. The conductive structure includes a conductive layer, and the conductive layer is nonmagnetic. The magnetic recording head assembly also includes an external AC source to supply AC current that flows through the conductive structure. In one aspect, the conductive structure is between a coil structure and the trailing shield, and the external AC source is coupled to the coil structure. The conductive structure and the external AC source facilitate consistently providing an enhanced AC writing field to facilitate effective and reliable writing, high ADC, high SNR, and reduced jitter.

公开(公告)号：US20220208220A1

公开(公告)日：2022-06-30

申请号：US17697859

申请日：2022-03-17

Applicant: Western Digital Technologies, Inc.

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

IPC: G11B5/115 ,  G11B5/31 ,  G11B5/127 ,  G11B5/187

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：US20220013139A1

公开(公告)日：2022-01-13

申请号：US17029826

申请日：2020-09-23

Applicant: Western Digital Technologies, Inc.

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

IPC: G11B5/37 ,  G11B5/11 ,  G11B5/23

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 layer, a first free layer, a gap layer, a second spin hall layer, a second free layer, and a second shield. The gap layer functions as an electrode and is disposed between the first spin hall layer and the second spin hall layer. Electrical lead connections are located about the first spin hall layer, the second spin hall 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：US20210409601A1

公开(公告)日：2021-12-30

申请号：US16915730

申请日：2020-06-29

Applicant: Western Digital Technologies, Inc.

Inventor： Quang LE ,  Zhigang BAI ,  Xiaoyong LIU ,  Zhanjie LI ,  Kuok San HO ,  Rajeev NAGABHIRAVA

IPC: H04N5/232 ,  H04N5/225 ,  G03B13/36 ,  G03B3/10

Abstract: Aspects of the present disclosure relate to optical devices and related methods that facilitate independent control of movement of lenses and image sensors in camera systems. In one example, an image sensor is movable independently of and relative to a lens, and the lens is movable independently of the image sensor. In one example, an optical device includes a lens, and an image sensor disposed below the lens. The image sensor is movable relative to the lens. The optical device includes a plurality of magnets disposed about the lens, a plurality of vertical coil structures coiled in one or more vertical planes, and one or more horizontal coil structures coiled in one or more horizontal planes. The plurality of vertical coil structures are configured to, when powered, move the image sensor relative to the lens. The one or more horizontal coil structures are configured to, when powered, move the lens.