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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
发明人： 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分类号： G11B5/315 , G11B5/11 , G11B5/1278 , G11B5/235 , G11B5/314 , G11B5/3116 , G11B5/3133 , G11B5/3146 , G11B5/21 , G11B2005/0024
摘要： 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
发明人： Gonçalo Marcos Baião De Albuquerque , Yunfei Ding , Alexander Goncharov , Kuok San Ho , Daniele Mauri , Goran Mihajlovic , Suping Song , Petrus Antonius Van Der Heijden
摘要： 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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公开(公告)号：US11508401B1
公开(公告)日：2022-11-22
申请号：US17183155
申请日：2021-02-23
发明人： Muhammad Asif Bashir , Petrus Antonius Van Der Heijden , James Terrence Olson , Alexander Goncharov , Zhigang Bai , Yunfei Ding
IPC分类号： G11B11/105 , G11B5/31
摘要： Aspects of the present disclosure generally relate to a magnetic recording head of a magnetic recording device that facilitates generating a downtrack magnetic bias field to enhance writing. During magnetic writing using the magnetic recording head, a bias current is directed in a cross-track direction on the trailing side of the main pole. Bias current flowing in the cross-track direction on a leading side of the main pole is reduced or eliminated. The bias current flowing in the cross-track direction on the trailing side of the main pole facilitates generating a magnetic field in a downtrack direction. The magnetic field in the downtrack direction is a bias field generated using the bias current. The magnetic bias field in the downtrack direction facilitates enhanced writing performance and increased areal density capability (ADC) for magnetic recording.
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公开(公告)号：US20210327462A1
公开(公告)日：2021-10-21
申请号：US17361496
申请日：2021-06-29
摘要： Disclosed herein is a data storage device comprising a slider comprising an embedded contact sensor, an electronics module, and a plurality of lines disposed between and coupled to the slider and the electronics module, wherein at least one line of the plurality of lines is configured to both (a) couple a slider bias voltage to a body of the slider to control a potential of the slider, and (b) provide a signal to the embedded contact sensor. The slider may also include a shunt circuit for mitigating radio-frequency interference by shunting it to ground. The slider may include a write element, which may include a write-field enhancement structure. The slider may include a read element for reading from a recording media.
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公开(公告)号：US10891973B2
公开(公告)日：2021-01-12
申请号：US16816211
申请日：2020-03-11
摘要： Disclosed herein are circuits, architectures, and methods that provide for the control of a data storage device write head's trailing shield and main pole potential with respect to the disk using circuitry that is integrated with circuitry used to bias a spin torque oscillator (STO) apparatus. Various embodiments include slider connections with STO bias circuitry that resides in a read/write integrated circuit, which has a programmable circuit that generates a bias current with overshoot (bias kicks). Also disclosed are circuits that may be incorporated into a slider to mitigate radio-frequency interference.
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公开(公告)号：US10566018B2
公开(公告)日：2020-02-18
申请号：US16360902
申请日：2019-03-21
发明人： Joey M. Poss , Ian R. McFadyen , Jih-Shiuan Luo , Yunfei Ding
摘要： A data storage device is disclosed comprising a first head actuated over a first disk surface, the first head comprising a plurality of elements including a first element. During a first write operation of the first head, a first bias signal having a first polarity is applied to the first element, and a write interval of the first write operation is measured. During a non-write mode of the first head, a second bias signal having a second polarity opposite the first polarity is applied to the first element during a reverse bias interval that is based on the write interval of the first write operation.
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7.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
IPC分类号： G11B5/012
CPC分类号： G11B5/012 , G11B2005/001
摘要： 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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公开(公告)号：US11900971B1
公开(公告)日：2024-02-13
申请号：US17845777
申请日：2022-06-21
发明人： Alexander Goncharov , Muhammad Asif Bashir , Petrus Antonius Van Der Heijden , Yunfei Ding , Zhigang Bai , James Terrence Olson
CPC分类号： G11B5/3116 , G11B5/23
摘要： 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
发明人： Yu Lo , Yan Liu , Timothy A. Riener , Feng Liu , Yunfei Ding , Yaw-Shing Tang , Karl A. Flechsig
CPC分类号： G11B5/40 , G11B33/144 , G11B2005/0018
摘要： 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
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.
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