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1.发明公开公开(公告)号：US20240355353A1
公开(公告)日：2024-10-24
申请号：US18355133
申请日：2023-07-19
Applicant: Western Digital Technologies, Inc.
Inventor： Muhammad ASIF BASHIR , Alexander GONCHAROV , Daniel BAI , Yunfei DING
IPC: G11B5/31
CPC classification number: G11B5/3116 , G11B5/3143 , G11B2005/0024
Abstract: The present disclosure generally relates to a magnetic recording head for magnetic media, such as a magnetic media drive. The head has a main pole, trailing shield, leading shield, first side shield, and second side shield. One side shield is electrically connected to the trailing shield and electrically disconnected from the leading shield. The other side shield is electrically connected to the leading shield and electrically disconnected from the trailing shield. The side shields are electrically connected through a hot seed layer and/or a nonmagnetic electrically conductive layer that is electrically disconnected from the main pole. Such an arrangement results in a current path from the trailing shield, through the side shields, around the main pole, and to the leading shield, which results in reduced resistance.
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公开(公告)号：US20200327902A1
公开(公告)日：2020-10-15
申请号：US16911083
申请日：2020-06-24
Applicant: Western Digital Technologies, Inc.
Inventor： Alexander GONCHAROV , Muhammad ASIF BASHIR , James Terrence OLSON , Petrus Antonius VANDERHEIJDEN
Abstract: A magnetic recording head is disclosed having a main pole, a shield hot seed layer positioned at a first side of the main pole, a first material positioned at both a second side and a third side of the main pole, the first material connected to the main pole, a second material positioned adjacent to the first material on the second side and the third side of the main pole, the second material comprised of a spin torque layer, a third material positioned adjacent to the second material on the second side and the third side of the main pole, a fourth material positioned adjacent to the third material on the second side and the third side of the main pole and a side shield connected on an exterior side of the fourth material.
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公开(公告)号：US20250166658A1
公开(公告)日：2025-05-22
申请号：US18511235
申请日：2023-11-16
Applicant: Western Digital Technologies, Inc.
Inventor： Muhammad ASIF BASHIR , Yunfei DING , Zhigang BAI , Alexander GONCHAROV , Aron PENTEK
Abstract: The present disclosure generally relates to a magnetic recording system comprising a magnetic recording head that provides a low resistance cross-track current path at the trailing side of the main pole. A bias current may be driven through the path to enhance the magnetic write field to the magnetic recording media. The current is driven by an alternating current (AC) source external to the head. In some embodiments, the cross-track current going through the low resistance path enables high amounts of current to be utilized without break down of the magnetic recording head.
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公开(公告)号：US20240112694A1
公开(公告)日：2024-04-04
申请号：US18540472
申请日：2023-12-14
Applicant: Western Digital Technologies, Inc.
Inventor： Muhammad ASIF BASHIR , Petrus Antonius VAN DER HEIJDEN , James Terrence OLSON , Alexander GONCHAROV , Zhigang BAI , Yunfei DING
IPC: G11B5/31
CPC classification number: G11B5/315 , G11B5/3116
Abstract: Aspects of the present disclosure generally relate to a magnetic recording head assembly that includes an external alternating current (AC) source. A magnetic recording head of the magnetic recording head assembly includes a conductive structure between a main pole and a trailing shield. The conductive structure includes a conductive layer, and the conductive layer is nonmagnetic. The magnetic recording head assembly also includes an external AC source to supply AC current that flows through the conductive structure. In one aspect, the conductive structure is between a coil structure and the trailing shield, and the external AC source is coupled to the coil structure. The conductive structure and the external AC source facilitate consistently providing an enhanced AC writing field to facilitate effective and reliable writing, high ADC, high SNR, and reduced jitter.
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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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Patent Agency Ranking
6.发明申请公开(公告)号：US20200227076A1
公开(公告)日：2020-07-16
申请号：US16835198
申请日：2020-03-30
Applicant: Western Digital Technologies, Inc.
Inventor： Alexander GONCHAROV , Muhammad ASIF BASHIR
Abstract: A microwave-assisted magnetic recording (MAMR) write head has a spin-torque oscillator (STO) and a ferromagnetic compensation layer between the write pole and trailing shield. The compensation layer is separated from the free layer by a nonmagnetic barrier layer that prevents spin-polarized electrons from the free layer from reaching the compensation layer. The compensation layer may be located between the write pole and the free layer. Electrons become spin-polarized by the compensation layer and are reflected back from the write pole across a nonmagnetic spacer layer. This causes the magnetization of the compensation layer to flip and become antiparallel to the magnetization of the free layer. The compensation layer thus generates a DC offset field that compensates for the negative effect of the DC shunting field from the free layer.
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公开(公告)号：US20190244634A1
公开(公告)日：2019-08-08
申请号：US16276480
申请日：2019-02-14
Applicant: Western Digital Technologies, Inc.
Inventor： Alexander GONCHAROV , Muhammad ASIF BASHIR , James Terrence OLSON , Petrus Antonius VAN DER HEIJDEN
Abstract: A magnetic recording head is disclosed having a main pole, a shield hot seed layer positioned at a first side of the main pole, a first material positioned at both a second side and a third side of the main pole, the first material connected to the main pole, a second material positioned adjacent to the first material on the second side and the third side of the main pole, the second material comprised of a spin torque layer, a third material positioned adjacent to the second material on the second side and the third side of the main pole, a fourth material positioned adjacent to the third material on the second side and the third side of the main pole and a side shield connected on an exterior side of the fourth material.
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8.发明公开公开(公告)号：US20240144963A1
公开(公告)日：2024-05-02
申请号：US18226111
申请日：2023-07-25
Applicant: Western Digital Technologies, Inc.
Inventor： Muhammad ASIF BASHIR , Alexander GONCHAROV , Zhigang BAI , Masato SHIIMOTO , Yunfei DING
IPC: G11B5/31
CPC classification number: G11B5/3116 , G11B5/314
Abstract: The present disclosure is generally related to a magnetic recording device comprising a magnetic recording head. The magnetic recording head comprises a main pole, a hot seed layer, and a spintronic device disposed between the main pole and the hot seed layer. The spintronic device comprises two field generation layers (FGLs), two spin polarization layers (SPLs), and two spin kill layers. The second SPL of the spintronic device drives the second FGL. The spintronic device further comprises one or more optional thin negative beta material layers, such as layers comprising FeCr, disposed in contact with at least one of the spin kill layers. When electric current is applied, the spin kill layers and optional negative beta material layers eliminate or reduce any spin torque between the FGLs and the SPLs.
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9.发明公开公开(公告)号：US20240144962A1
公开(公告)日：2024-05-02
申请号：US18226109
申请日：2023-07-25
Applicant: Western Digital Technologies, Inc.
Inventor： Muhammad ASIF BASHIR , Alexander GONCHAROV , Zhigang BAI , Masato SHIIMOTO , Yunfei DING
IPC: G11B5/31
CPC classification number: G11B5/3116 , G11B5/314
Abstract: The present disclosure is generally related to a magnetic recording device comprising a magnetic recording head. The magnetic recording head comprises a main pole, a shield, and a spintronic device disposed between the main pole and the shield. The spintronic device comprises two field generation layers (FGLs), two spin polarization layers (SPLs), and two spin kill layers. The spintronic device further comprises one or more optional thin negative beta material layers, such as layers comprising FeCr, disposed in contact with at least one of the spin kill layers. When electric current is applied, the spin kill layers and optional negative beta material layers eliminate or reduce any spin torque between the FGLs and the SPLs.
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公开(公告)号：US20240135966A1
公开(公告)日：2024-04-25
申请号：US18226114
申请日：2023-07-24
Applicant: Western Digital Technologies, Inc.
Inventor： Muhammad ASIF BASHIR , Alexander GONCHAROV , Yaguang WEI
IPC: G11B5/31
Abstract: The present disclosure is generally related to a magnetic recording device comprising a magnetic recording head. The magnetic recording head comprises a main pole (MP), a shield, and a spintronic device disposed between the MP and the shield. The spintronic device comprises a MP notch disposed on the MP, a first spin torque layer (STL), a second STL, a spin kill layer disposed between the first and second STLs, and a shield notch. The spin kill layer prevents spin torque from being transferred between the first STL and the second STL. In a forward stack where electrons flow from the MP to the shield, the MP notch comprises FeCr and the shield notch comprises CoFe. In a reverse stack where electrons flow from the shield to the MP, the MP notch comprises CoFe and the shield notch comprises FeCr.
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