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公开(公告)号：US11227627B1
公开(公告)日：2022-01-18
申请号：US16906480
申请日：2020-06-19
Applicant: Western Digital Technologies, Inc.
Inventor： Suping Song , Zhanjie Li , Terence Lam , Changqing Shi , Lijie Guan
Abstract: The present disclosure generally relates to a magnetic media drive employing a magnetic recording head. The magnetic recording head comprises a main pole, an EAMR stack disposed on the main pole, and a trailing shield disposed on the EAMR stack. The EAMR stack comprises a seed layer disposed on the main pole, a spin torque layer disposed on the seed layer, and a spacer layer disposed on the spin torque layer. At least one surface of the spacer layer in contact with the spin torque layer has a smaller or reduced area than the spin torque layer. The at least one surface of the spacer layer in contact with the spin torque layer is recessed from a media facing surface and has a smaller cross-track width than the spin torque layer and a smaller width in the stripe height direction than the spin torque layer.
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公开(公告)号：US10699734B2
公开(公告)日：2020-06-30
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
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.
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公开(公告)号：US10276208B1
公开(公告)日：2019-04-30
申请号：US15990468
申请日：2018-05-25
Applicant: Western Digital Technologies, Inc.
Inventor： Zhigang Bai , Yaguang Wei , Terence Tin Lok Lam , Kuok San Ho , Lijie Guan
Abstract: A data storage device is disclosed comprising a head actuated over a disk surface comprising a first magnetic recording layer and a second magnetic recording layer. Data is encoded into a codeword comprising a plurality of non-binary symbols wherein each symbol represents one of a plurality of symbol values comprising a first symbol value, a second symbol value, and a third symbol value. The first symbol value is written to the disk surface by magnetizing the first and second magnetic recording layers, and the second symbol value is written to the disk surface by magnetizing the first magnetic recording layer without substantially affecting the magnetization of the second magnetic recording layer. The encoding into the codeword codes out at least one sequence of symbol values to prevent an ambiguity between detecting the first symbol value and the second symbol value during a read operation.
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4.发明授权公开(公告)号：US11854581B2
公开(公告)日：2023-12-26
申请号：US17860343
申请日：2022-07-08
Applicant: Western Digital Technologies, Inc.
Inventor： Suping Song , Zhanjie Li , Terence T. Lam , Lijie Guan
CPC classification number: G11B5/315 , G11B5/1278 , G11B5/235 , G11B5/3116 , G11B5/3133 , G11B5/3143 , G11B5/3146 , G11B5/012 , G11B5/02 , G11B5/11 , G11B2005/0024
Abstract: Embodiments of the present disclosure generally relate to a magnetic media drive employing a magnetic recording device. The magnetic recording device comprises a trailing gap disposed adjacent to a first surface of a main pole, a first side gap disposed adjacent to a second surface of the main pole, a second side gap disposed adjacent to a third surface of the main pole, and a leading gap disposed adjacent to a fourth surface of the main pole. A side shield surrounds the main pole and comprises a heavy metal first layer and a magnetic second layer. The first layer surrounds the first, second, and third surfaces of the main pole, or the second, third, and fourth surfaces of the main pole. The second layer surrounds the second and third surfaces of the main pole, and may further surround the fourth surface of the main pole.
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公开(公告)号：US11848034B2
公开(公告)日：2023-12-19
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
CPC classification number: G11B5/3113 , G11B5/1278 , G11B5/315 , G11B5/3146 , 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.
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Patent Agency Ranking
公开(公告)号：US11657835B2
公开(公告)日：2023-05-23
申请号：US17721137
申请日：2022-04-14
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
CPC classification number: G11B5/115 , G11B5/1278 , G11B5/187 , G11B5/3116
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.
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公开(公告)号：US10997991B2
公开(公告)日：2021-05-04
申请号：US16996723
申请日：2020-08-18
Applicant: Western Digital Technologies, Inc.
Inventor： Suping Song , Zhanjie Li , Terence Lam , Lijie Guan
Abstract: A magnetic recording head includes a trailing shield, a main pole, and a spin Hall layer. The spin Hall layer is disposed between the trailing shield and the main pole. A first spin torque layer is disposed between the spin Hall layer and the trailing shield. A second spin torque layer is disposed between the spin Hall layer and the main pole.
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公开(公告)号：US11373675B2
公开(公告)日：2022-06-28
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
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.
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公开(公告)号：US11087783B1
公开(公告)日：2021-08-10
申请号：US16917521
申请日：2020-06-30
Applicant: Western Digital Technologies, Inc.
Inventor： Suping Song , Terence Lam , Changqing Shi , Lijie Guan
Abstract: The present disclosure is generally related to a magnetic media drive employing a magnetic recording head. The magnetic recording head comprises a main pole extending to a media facing surface (MFS). The main pole has a gradually increasing cross-section area with a low aspect ratio from the MFS to a surface recessed from and parallel to the MFS. The main pole comprises a first leading edge taper angle (LETA), a second LETA less than the first LETA, a first trailing edge taper angle (TETA), and a second TETA less than the first TETA. The main pole further comprises a first flare recessed a first distance from the MFS, the first flare having a first angle, and a second flare recessed a second distance from the MFS greater than the first distance, the second flare having a second angle greater than the first angle.
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公开(公告)号：US10777219B1
公开(公告)日：2020-09-15
申请号：US16450111
申请日：2019-06-24
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
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.
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