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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.
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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
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.
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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
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.
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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.
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公开(公告)号：US11615806B2
公开(公告)日：2023-03-28
申请号：US17697859
申请日：2022-03-17
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
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 first and second electrically conductive, non-magnetic material layers. The spin torque oscillator stack is coupled to the first 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：US11017802B2
公开(公告)日：2021-05-25
申请号：US16998989
申请日：2020-08-20
发明人： Venkatesh Chembrolu , Zhigang Bai , Yaguang Wei , Anna Zheng , Supradeep Narayana , Suping Song , Terence Lam , Michael Kouk 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 a record element located in a trailing gap between the main pole and the trailing magnetic shield. The record element includes an electrically conductive, non-magnetic material portion which is not part of a spin torque oscillator stack. The main pole and the trailing magnetic shield are electrically shorted by the record element 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 record element.
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公开(公告)号：US10679650B2
公开(公告)日：2020-06-09
申请号：US16277953
申请日：2019-02-15
发明人： Zhigang Bai , Venkatesh Chembrolu , Yaguang Wei , Terence Lam , Michael Kuok San Ho , Lijie Guan , Suping Song , Supradeep Narayana
摘要： A current-assisted magnetic recording write head has an electrically conductive layer in the write gap between the write pole and the trailing shield. Electrical circuitry directs current from the write pole, through the conductive layer, to the trailing shield. The current through the conductive layer generates an Ampere field substantially orthogonal to the magnetization in the write pole to assist magnetization switching of the write pole. The write head's magnetic throat height (THm) is substantially the thickness of the trailing shield at the write gap, while the write head's electrical throat height (THe) is substantially the height of the conductive layer in the write gap. In embodiments of this invention, the signal-to-noise ratio (SNR) of the readback signal and the soft error rate (SER) of the recorded data can be improved with a write gap structure wherein THe is greater than THm.
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