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公开(公告)号：US12249358B2
公开(公告)日：2025-03-11
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
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.
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2.发明授权公开(公告)号：US12190919B2
公开(公告)日：2025-01-07
申请号：US18226109
申请日：2023-07-25
Applicant: Western Digital Technologies, Inc.
Inventor： Muhammad Asif Bashir , Alexander Goncharov , Zhigang Bai , Masato Shiimoto , Yunfei Ding
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 shield, and a spintronic device disposed between the main pole and the shield. The spintronic device comprises two field generation layers (FGLs), two spin polarization layers (SPLs), and two spin kill layers. 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.
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公开(公告)号：US11881237B1
公开(公告)日：2024-01-23
申请号：US17456440
申请日：2021-11-24
Applicant: Western Digital Technologies, Inc.
Inventor： Muhammad Asif Bashir , Edward Hin Pong Lee , Amanda Baer , Aron Pentek , Zhigang Bai , Yunfei Ding , James Terrence Olson , Alexander Goncharov , Petrus Antonius Van Der Heijden
CPC classification number: G11B5/315 , G11B5/11 , G11B5/1278 , G11B5/235 , G11B5/314 , G11B5/3116 , G11B5/3133 , G11B5/3146 , G11B5/21 , G11B2005/0024
Abstract: The present disclosure is generally related to a magnetic recording device comprising a magnetic recording head having a current flow in a cross-track direction around a 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 main pole and the trailing shield. A hot seed layer is disposed between the trailing gap and the trailing shield. A first insulation layer is disposed between the hot seed layer and the trailing shield, where the first insulation layer contacts the side shields. A second insulation layer is disposed between the main pole and leading shield, where the second insulation layer contacts the side shields. The first and second insulation layers direct the current through the side shields and across the main pole in a cross-track direction.
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公开(公告)号：US10388305B1
公开(公告)日：2019-08-20
申请号：US15919025
申请日：2018-03-12
Applicant: Western Digital Technologies, Inc.
Inventor： Gonçalo Marcos Baião De Albuquerque , Yunfei Ding , Alexander Goncharov , Kuok San Ho , Daniele Mauri , Goran Mihajlovic , Suping Song , Petrus Antonius Van Der Heijden
Abstract: Disclosed herein are apparatuses and methods for writing to a magnetic medium, and data storage devices comprising such apparatuses and methods. An apparatus comprises a main pole, a trailing shield, a write-field-enhancing structure, a write coil, a write current control circuit configured to supply a write current to the write coil to record a bit to a magnetic medium, and a driving current control circuit configured to supply a driving current to the write-field-enhancing structure, wherein the driving current comprises a driving pulse. A method of writing to a magnetic medium comprises supplying a write current to a write coil of a magnetic write head, and supplying a driving current to a free layer disposed in a write gap between a main pole and a trailing shield of the magnetic write head, wherein the driving current comprises an AC component.
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5.发明公开公开(公告)号：US20240203449A1
公开(公告)日：2024-06-20
申请号：US18447419
申请日：2023-08-10
Applicant: Western Digital Technologies, Inc.
Inventor： John T. Contreras , Howard Gordon Zolla , Yunfei Ding , Joey M. Poss
IPC: G11B5/012
CPC classification number: G11B5/012 , G11B2005/001
Abstract: Various illustrative aspects are directed to a data storage device comprising a disk and a read/write head configured to read data from and write data to the disk. The read/write head comprises a write pole tip and a transducer configured near the write pole tip. One or more processing devices are mounted on or near the read/write head and generate an AC current that is applied to the transducer to cause the transducer to generate a high frequency auxiliary field that is applied to the disk. The one or more processing devices may be an RF source IC mounted on or near a slider on which the read/write head is integrated or mounted.
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Patent Agency Ranking
公开(公告)号：US11900971B1
公开(公告)日：2024-02-13
申请号：US17845777
申请日：2022-06-21
Applicant: Western Digital Technologies, Inc.
Inventor： Alexander Goncharov , Muhammad Asif Bashir , Petrus Antonius Van Der Heijden , Yunfei Ding , Zhigang Bai , James Terrence Olson
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.
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公开(公告)号：US11776568B2
公开(公告)日：2023-10-03
申请号：US17652070
申请日：2022-02-22
Applicant: Western Digital Technologies, Inc.
Inventor： Yu Lo , Yan Liu , Timothy A. Riener , Feng Liu , Yunfei Ding , Yaw-Shing Tang , Karl A. Flechsig
CPC classification number: G11B5/40 , G11B33/144 , G11B2005/0018
Abstract: The present disclosure generally relates to improved lifetime of a data storage device utilizing an energy assist element. Rather than applying the same current to each energy assist element of a device, each energy assist element has a write current specific to the energy assist element. The unique applied current results in the corresponding energy assist elements having substantially the same temperature during operation. Obtaining substantially the same temperature during operation provides predictable and repeatable device performance and increases the lifetime of the entire data storage device as all energy assist elements should have substantially the same lifetime.
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公开(公告)号：US10741202B2
公开(公告)日：2020-08-11
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
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.
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公开(公告)号：US12205620B2
公开(公告)日：2025-01-21
申请号：US18228523
申请日：2023-07-31
Applicant: Western Digital Technologies, Inc.
Inventor： Alexander Goncharov , Muhammad Asif Bashir , Yunfei Ding
Abstract: The present disclosure generally relates to a magnetic recording system comprising a magnetic recording head. The magnetic recording head comprises a main pole, a shield, and a spintronic device disposed between the main pole and the shield. The spintronic device comprises a field generation layer (FGL) spaced a distance of about 2 nm to about 3 nm from the main pole, a first spacer layer disposed on the FGL, a spin torque layer (STL) disposed on the first spacer layer, a second spacer layer disposed on the STL, and a negative polarization layer (NPL) disposed between the second spacer layer and the shield. The spintronic device has a length of about 17 nm to about 21. During operation, the STL has a magnetization precession of about 16 degrees to about 170 degrees, and the FGL has a magnetization precession of about 60 degrees to about 70 degrees.
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公开(公告)号：US12183372B2
公开(公告)日：2024-12-31
申请号：US18447419
申请日：2023-08-10
Applicant: Western Digital Technologies, Inc.
Inventor： John T. Contreras , Howard Gordon Zolla , Yunfei Ding , Joey M. Poss
Abstract: Various illustrative aspects are directed to a data storage device comprising a disk and a read/write head configured to read data from and write data to the disk. The read/write head comprises a write pole tip and a transducer configured near the write pole tip. One or more processing devices are mounted on or near the read/write head and generate an AC current that is applied to the transducer to cause the transducer to generate a high frequency auxiliary field that is applied to the disk. The one or more processing devices may be an RF source IC mounted on or near a slider on which the read/write head is integrated or mounted.
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