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

IPC: G11B5/235 ,  G11B5/127 ,  G11B5/31 ,  G11B5/00

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.

公开(公告)号：US11881237B1

公开(公告)日：2024-01-23

申请号：US17456440

申请日：2021-11-24

Applicant: Western Digital Technologies, Inc.

Inventor： 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

IPC: G11B5/11 ,  G11B5/127 ,  G11B5/235 ,  G11B5/31 ,  G11B5/21 ,  G11B5/00

CPC classification number: G11B5/315 ,  G11B5/11 ,  G11B5/1278 ,  G11B5/235 ,  G11B5/314 ,  G11B5/3116 ,  G11B5/3133 ,  G11B5/3146 ,  G11B5/21 ,  G11B2005/0024

Abstract: 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.

公开(公告)号：US11211083B1

公开(公告)日：2021-12-28

申请号：US16911296

申请日：2020-06-24

Applicant: Western Digital Technologies, Inc.

Inventor： Yuankai Zheng ,  Zheng Gao ,  Christian Kaiser ,  Zhitao Diao ,  Susumu Okamura ,  James Mac Freitag ,  Alexander Goncharov

IPC: G11B5/127 ,  G11B5/31 ,  G11B5/02 ,  G11B5/00

Abstract: Embodiments of the present disclosure generally relate to a write head for a magnetic recording device. The write head includes a spin torque oscillator (STO) that has a seed layer formed on a write pole, a spin polarization layer (SPL) formed on the seed layer, a first spacer layer formed on the SPL, a field generation layer (FGL) formed on the first spacer layer, a second spacer layer formed on the FGL, and a notch formed on the second spacer layer. The FGL and the notch are antiferromagnetically coupled through the second spacer layer and thus increases the FGL angle and improves the write capabilities of the write head.

公开(公告)号：US10388305B1

公开(公告)日：2019-08-20

申请号：US15919025

申请日：2018-03-12

Applicant: Western Digital Technologies, Inc.

Inventor： Gonçalo Marcos Baião De Albuquerque ,  Yunfei Ding ,  Alexander Goncharov ,  Kuok San Ho ,  Daniele Mauri ,  Goran Mihajlovic ,  Suping Song ,  Petrus Antonius Van Der Heijden

IPC: G11B5/09 ,  G11B5/31

Abstract: 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.

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

IPC: G11B5/31 ,  G11B5/23

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.

公开(公告)号：US11682421B2

公开(公告)日：2023-06-20

申请号：US17359046

申请日：2021-06-25

Applicant: Western Digital Technologies, Inc.

Inventor： David J. Seagle ,  Alexander Goncharov ,  Robert G. Biskeborn

IPC: G11B5/48 ,  G11B5/265 ,  G11B5/29 ,  G11B5/008 ,  G11B5/23 ,  G11B5/39 ,  G11B5/115 ,  G11B5/11 ,  G11B15/26

CPC classification number: G11B5/3977 ,  G11B5/00813 ,  G11B5/115 ,  G11B5/23 ,  G11B5/265 ,  G11B5/2652 ,  G11B5/29 ,  G11B5/3958 ,  G11B5/3967 ,  G11B5/4893 ,  G11B5/11 ,  G11B15/26

Abstract: The present disclosure generally relates to a tape drive including a tape head. The tape head comprises at least one same gap verify (SGV) module comprising a plurality of write transducer and read transducer pairs disposed on a substrate. Each pair comprises a null shield disposed between the write transducer and the read transducer. One or more of a position between the write transducer and the read transducer of each pair, a width, a height, a thickness, and a permeability of the null shield is adjusted to create a null region, and the read transducer is disposed in the null region. The SGV module is configured to write data to a tape using the write transducer of each pair and read verify the data written on the tape using the read transducer of each pair such that the write transducer and read transducer of each pair are concurrently operable.

公开(公告)号：US11657836B2

公开(公告)日：2023-05-23

申请号：US17649246

申请日：2022-01-28

Applicant: Western Digital Technologies, Inc.

Inventor： James Mac Freitag ,  Susumu Okamura ,  Alexander Goncharov ,  Zheng Gao

IPC: G11B5/127 ,  G11B5/02 ,  G11B5/31 ,  G11B5/23

CPC classification number: G11B5/1278 ,  G11B5/02 ,  G11B5/23 ,  G11B5/313 ,  G11B5/314 ,  G11B5/315 ,  G11B5/3133 ,  G11B5/3146

Abstract: Aspects of the present disclosure generally relate to a magnetic recording head of a spintronic device, such as a write head of a data storage device, for example a magnetic media drive. In one example, a magnetic recording head includes a main pole, a trailing shield, and a spin torque layer (STL) between the main pole and the trailing shield. The magnetic recording head includes a first layer structure on the main pole, and the first layer structure includes a negative polarization layer. The magnetic recording head also includes a second layer structure disposed on the negative polarization layer and between the negative polarization layer and the STL. The negative polarization layer is an FeCr layer. The second layer structure includes a Cr layer disposed on the FeCr layer, and a Cu layer disposed on the Cr layer and between the Cr layer and the STL.

公开(公告)号：US11257514B2

公开(公告)日：2022-02-22

申请号：US16912509

申请日：2020-06-25

Applicant: Western Digital Technologies, Inc.

Inventor： James Mac Freitag ,  Susumu Okamura ,  Alexander Goncharov ,  Zheng Gao

IPC: G11B5/127 ,  G11B5/02 ,  G11B5/31 ,  G11B5/23

Abstract: Aspects of the present disclosure generally relate to a magnetic recording head of a spintronic device, such as a write head of a data storage device, for example a magnetic media drive. In one example, a magnetic recording head includes a main pole, a trailing shield, and a spin torque layer (STL) between the main pole and the trailing shield. The magnetic recording head includes a first layer structure on the main pole, and the first layer structure includes a negative polarization layer. The magnetic recording head also includes a second layer structure disposed on the negative polarization layer and between the negative polarization layer and the STL. The negative polarization layer is an FeCr layer. The second layer structure includes a Cr layer disposed on the FeCr layer, and a Cu layer disposed on the Cr layer and between the Cr layer and the STL.

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.

Inventor： Muhammad Asif Bashir ,  Alexander Goncharov ,  Petrus Antonius Van Der Heijden

IPC: G11B5/31 ,  G11B5/23 ,  G11B5/127

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.

公开(公告)号：US11894026B1

公开(公告)日：2024-02-06

申请号：US17845788

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

IPC: G11B5/11 ,  G11B5/115

CPC classification number: G11B5/115

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.