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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
Applicant: Western Digital Technologies, Inc.
Inventor： Alexander Goncharov , Muhammad Asif Bashir , Petrus Antonius Van Der Heijden , Yunfei Ding , Zhigang Bai , James Terrence Olson
CPC classification number: G11B5/3116 , G11B5/23
Abstract: 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：US10997989B1
公开(公告)日：2021-05-04
申请号：US16438377
申请日：2019-06-11
Applicant: Western Digital Technologies, Inc.
Abstract: The present disclosure generally relates to data storage devices, and more specifically, to a magnetic media drive employing a magnetic recording head. A magnetic recording head comprises a main pole disposed between a leading shield and a trailing shield. A spin torque oscillator is disposed between the main pole and the trailing shield at a media facing surface. A hot seed bilayer is disposed between the spin torque oscillator and the trailing shield, where the hot seed bilayer is conformal with the spin torque oscillator. The hot seed bilayer comprises a first layer comprised of a high magnetic moment material disposed at the media facing surface and a second layer comprised of a low magnetic material recessed from the media facing surface.
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公开(公告)号：US12205620B2
公开(公告)日：2025-01-21
申请号：US18228523
申请日：2023-07-31
Applicant: Western Digital Technologies, Inc.
Inventor： Alexander Goncharov , Muhammad Asif Bashir , Yunfei Ding
Abstract: The present disclosure generally relates to a magnetic recording system 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 a field generation layer (FGL) spaced a distance of about 2 nm to about 3 nm from the main pole, a first spacer layer disposed on the FGL, a spin torque layer (STL) disposed on the first spacer layer, a second spacer layer disposed on the STL, and a negative polarization layer (NPL) disposed between the second spacer layer and the shield. The spintronic device has a length of about 17 nm to about 21. During operation, the STL has a magnetization precession of about 16 degrees to about 170 degrees, and the FGL has a magnetization precession of about 60 degrees to about 70 degrees.
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4.发明授权公开(公告)号：US12094498B1
公开(公告)日：2024-09-17
申请号：US18355114
申请日：2023-07-19
Applicant: Western Digital Technologies, Inc.
Inventor： Alexander Goncharov , James Mac Freitag , Susumu Okamura , Muhammad Asif Bashir
CPC classification number: G11B5/312 , G11B2005/0024
Abstract: The present disclosure generally relates to a spin torque element disposed between a main pole and a shield in a magnetic recording head. The shield could be a trailing shield, a side shield, or a leading shield. The spin torque element includes a dual layer spin transfer structure that is spaced from magnetic layers on either side using spacer layers. One magnetic layer that faces a positive polarizer has a positive polarization while another magnetic layer facing the negative polarizer has a negative polarization. As such, torque in the spacer layers is maximized when the direction of the magnetization in the STL is opposite to the gap field.
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5.发明授权公开(公告)号：US12057145B2
公开(公告)日：2024-08-06
申请号：US18351344
申请日：2023-07-12
Applicant: Western Digital Technologies, Inc.
CPC classification number: G11B5/235 , G11B5/1278 , G11B5/3109 , G11B5/314 , G11B5/3146 , G11B2005/0024
Abstract: Embodiments of the present disclosure relate to magnetic recording heads (e.g., magnetic write heads) for magnetic recording devices (e.g., hard disk drives (HDD's)). A magnetic recording head includes, in a gap between a write pole and a trailing shield: a spin polarization layer (SPL), a free layer, and a spacer layer between the SPL and free layer. A spin torque layer (STL) is additionally included, and is separated from the free layer by a barrier layer that reduces or eliminates spin torque between the free layer and the STL. In one or more embodiments, to enable a thinner barrier layer, one or more dusting layers are inserted between the write pole and the trailing shield, and the one or more dusting layers are each formed of iron-chromium (FeCr). This helps maintain a thinner or narrower material stack in the gap and enhances writer performance.
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Patent Agency Ranking
公开(公告)号：US11854584B1
公开(公告)日：2023-12-26
申请号：US17876900
申请日：2022-07-29
Applicant: Western Digital Technologies, Inc.
Inventor： Muhammad Asif Bashir , Alexander Goncharov , Takuya Matsumoto , Petrus Antonius Van Der Heijden
CPC classification number: G11B5/6088 , G11B2005/0021
Abstract: The present disclosure relates to heat-assisted magnetic recording (HAMR) write heads including a waveguide and a main pole having a main pole tip. One or more current paths are provided through the main pole tip. Terminals of the one or more current paths can be coupled to the main pole, a trailing shield, a leading shield, a heat sink layer, a touch pad, a pole diffusion barrier layer, a NTS sensor, or another suitable component of the HAMR write head.
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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
Applicant: Western Digital Technologies, Inc.
Inventor： Muhammad Asif Bashir , Petrus Antonius Van Der Heijden , James Terrence Olson , Alexander Goncharov , Zhigang Bai , Yunfei Ding
IPC: G11B11/105 , G11B5/31
Abstract: 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：US10997990B2
公开(公告)日：2021-05-04
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：US10891977B1
公开(公告)日：2021-01-12
申请号：US16924074
申请日：2020-07-08
Applicant: Western Digital Technologies, Inc.
Abstract: A microwave assisted magnetic recording (MAMR) write head includes a main pole and a trailing shield. A spin torque oscillator device is disposed between the main pole and the trailing shield. The spin torque oscillator device includes a free layer. A trailing shield hot seed layer is disposed between the spin torque oscillator device and the trailing shield. The trailing shield hot seed layer includes a magnetic material doped with a rare earth element. In certain embodiments, the trailing shield hot seed layer includes the rare earth element in an atomic percent content from about 2% to about 10% atomic percent. In certain embodiments, the trailing shield hot seed layer has an intrinsic damping from about 0.02 to about 0.2.
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10.发明授权公开(公告)号：US12190919B2
公开(公告)日：2025-01-07
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
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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