-
公开(公告)号：US10957348B2
公开(公告)日：2021-03-23
申请号：US16911143
申请日：2020-06-24
发明人： Zhigang Bai , Alexander Taratorin , Anna Zheng , Venkatesh Chembrolu , Supradeep Narayana , Suping Song , Yaguang Wei , Terence Lam , Michael Kuok San Ho , Changqing Shi , Lijie Guan
摘要： 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：US10741202B2
公开(公告)日：2020-08-11
申请号：US16276500
申请日：2019-02-14
发明人： Michael Kuok San Ho , Yunfei Ding , Zhigang Bai , Yaguang Wei , Terence Lam , Goncalo Baiao de Albuquerque , Xinjiang Shen , Feng Q. Liu
摘要： 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：US10699734B2
公开(公告)日：2020-06-30
申请号：US16277947
申请日：2019-02-15
发明人： Zhigang Bai , Alexander Taratorin , Anna Zheng , Venkatesh Chembrolu , Supradeep Narayana , Suping Song , Yaguang Wei , Terence Lam , Michael Kuok San Ho , Changqing Shi , Lijie Guan
摘要： 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：US10276208B1
公开(公告)日：2019-04-30
申请号：US15990468
申请日：2018-05-25
发明人： Zhigang Bai , Yaguang Wei , Terence Tin Lok Lam , Kuok San Ho , Lijie Guan
摘要： 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.
-
公开(公告)号：US11373675B2
公开(公告)日：2022-06-28
申请号：US17141068
申请日：2021-01-04
发明人： 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
摘要： 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：US10777219B1
公开(公告)日：2020-09-15
申请号：US16450111
申请日：2019-06-24
发明人： 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
摘要： 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：US10762919B1
公开(公告)日：2020-09-01
申请号：US15883327
申请日：2018-01-30
发明人： Suping Song , Zhanjie Li , Yaguang Wei , Terence Tin-Lok Lam , Kuok San Ho
摘要： A perpendicular magnetic recording write head includes a main portion formed of conventional high-moment magnetic materials, and a beveled or tapered trailing portion formed of a Co/Fe multilayer with negative magnetic anisotropy (negative anisotropy constant or —Ku). The Co/Fe multilayer tapered trailing portion has a high saturation magnetization (Ms) and thus functions as part of the write pole to direct the flux perpendicularly to the recording layer. Also, the —Ku Co/Fe multilayer tapered trailing portion has its hard axis oriented substantially orthogonal to the layer thickness and thus substantially prevents flux leakage into the write gap. The —Ku Co/Fe multilayer may also be formed on the sides of the write pole in the cross-track direction to prevent flux leakage into the side gaps.
-
公开(公告)号：US11657835B2
公开(公告)日：2023-05-23
申请号：US17721137
申请日：2022-04-14
发明人： 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分类号： G11B5/115 , G11B5/1278 , G11B5/187 , G11B5/3116
摘要： 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：US11600293B1
公开(公告)日：2023-03-07
申请号：US16559372
申请日：2019-09-03
摘要： A magnetic recording device includes a main pole, a coil around the main pole, a trailing shield, and a leading shield. A trailing gap is between the main pole and the trailing shield. In one embodiment, the trailing gap includes a non-magnetic conductive material. In another embodiment, the trailing gap includes a spin torque oscillator device. A leading gap is between the main pole and the leading shield. The leading gap includes a non-magnetic conductive material. The main pole is coupled to a first terminal. The trailing shield coupled to a second terminal. The leading shield is coupled to a third terminal.
-
公开(公告)号：US11437060B2
公开(公告)日：2022-09-06
申请号：US17107637
申请日：2020-11-30
发明人： Venkatesh Chembrolu , Muhammad Asif Bashir , Petrus Antonius Van Der Heijden , Terence Lam , Yaguang Wei
摘要： The present disclosure generally relates to data storage devices, and more specifically, to a magnetic media drive employing a magnetic recording head. The head includes a main pole, a trailing shield, and a MAMR stack including at least one magnetic layer. The magnetic layer has a surface facing the main pole, and the surface has a first side at a media facing surface (MFS) and a second side opposite the first side. The length of the second side is substantially less than the length of the first side. By reducing the length of the second side, the area to be switched at a location recessed from the MFS is reduced as a current flowing from the main pole to the trailing shield or from the trailing shield to the main pole. With the reduced area of the magnetic layer, the overall switch time of the magnetic layer is decreased.
-
-
-
-
-
-
-
-
-
搜索结果
17 条记录 (耗时 0.013 秒)
