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1.发明申请公开(公告)号：US20200327900A1
公开(公告)日：2020-10-15
申请号：US16911143
申请日：2020-06-24
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：US20190318760A1
公开(公告)日：2019-10-17
申请号：US16293481
申请日：2019-03-05
Applicant: Western Digital Technologies, Inc.
Inventor： Venkatesh CHEMBROLU , Muhammad ASIF BASHIR , Petrus Antonius VAN DER HEIJDEN , Terence LAM , Yaguang WEI
IPC: G11B5/31
Abstract: 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.
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公开(公告)号：US20220108715A1
公开(公告)日：2022-04-07
申请号：US17644231
申请日：2021-12-14
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：US20200349968A1
公开(公告)日：2020-11-05
申请号：US16932468
申请日：2020-07-17
Applicant: Western Digital Technologies, Inc.
Inventor： Michael Kuok San HO , Yunfei DING , Zhigang BAI , Yaguang WEI , Terence LAM , Goncalo Marcos BAIÃO 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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5.发明申请公开(公告)号：US20210074322A1
公开(公告)日：2021-03-11
申请号：US17039840
申请日：2020-09-30
Applicant: Western Digital Technologies, Inc.
Inventor： Suping SONG , Zhanjie LI , Terence LAM , Lijie GUAN
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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Patent Agency Ranking
公开(公告)号：US20200381011A1
公开(公告)日：2020-12-03
申请号：US16995656
申请日：2020-08-17
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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公开(公告)号：US20210125631A1
公开(公告)日：2021-04-29
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：US20190251992A1
公开(公告)日：2019-08-15
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：US20210082457A1
公开(公告)日：2021-03-18
申请号：US17107637
申请日：2020-11-30
Applicant: Western Digital Technologies, Inc.
Inventor： Venkatesh CHEMBROLU , Muhammad ASIF BASHIR , Petrus Antonius VAN DER HEIJDEN , Terence LAM , Yaguang WEI
IPC: G11B5/31
Abstract: 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.
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公开(公告)号：US20200005815A1
公开(公告)日：2020-01-02
申请号：US16277953
申请日：2019-02-15
Applicant: Western Digital Technologies, Inc.
Inventor： Zhigang BAI , Venkatesh CHEMBROLU , Yaguang WEI , Terence LAM , Michael Kuok San HO , Lijie GUAN , Suping SONG , Supradeep NARAYANA
Abstract: 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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