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

IPC: G11B5/235 ,  G11B5/23 ,  G11B5/31 ,  G11B5/127 ,  G11B5/39 ,  G11B5/245 ,  G11B5/00 ,  G11B5/48

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.

公开(公告)号：US20210082458A1

公开(公告)日：2021-03-18

申请号：US17107611

申请日：2020-11-30

Applicant: Western Digital Technologies, Inc.

Inventor： Zhanjie LI ,  Suping SONG ,  Lijie GUAN

IPC: G11B5/37 ,  G11B5/127 ,  G11B5/31 ,  G11B5/235

Abstract: A magnetic recording head includes a trailing shield and a main pole. A trailing shield gap is between the trailing shield and the main pole. A spin orbital torque structure is within the trailing shield gap. The spin orbital torque structure includes a spin torque layer having a first side and a second side at a media facing surface. A first spin Hall layer is along the first side of the spin torque layer. A second spin Hall layer is along the second side of the spin torque layer. The first spin Hall layer comprises a heavy metal material having a positive spin Hall angle. The second spin Hall layer comprises a heavy metal material having a negative spin Hall angle.

公开(公告)号：US20200349967A1

公开(公告)日：2020-11-05

申请号：US16833650

申请日：2020-03-29

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: G11B5/127 ,  G11B5/31 ,  G11B5/60 ,  G11B5/11 ,  G11B5/02 ,  G11B5/39 ,  G11B5/455

Abstract: Disclosed herein are magnetic recording devices and methods of using them. A magnetic recording device comprises a main pole extending to an air-bearing surface (ABS), a trailing shield extending to the ABS, a write-field-enhancing structure disposed between and coupled to the main pole and the trailing shield at the ABS, a write coil configured to magnetize the main pole, a write current control circuit coupled to the write coil and configured to apply a write current to the write coil, wherein the write current comprises a write pulse, and a bias current control circuit coupled to the write-field-enhancing structure and configured to apply a bias current to the write-field-enhancing structure, wherein the bias current comprises a driving pulse offset in time from the write pulse by a delay, wherein the delay substantially coincides with an expected magnetization switch-time lag of a free layer of the write-field-enhancing structure.

公开(公告)号：US20240005951A1

公开(公告)日：2024-01-04

申请号：US17854617

申请日：2022-06-30

Applicant: Western Digital Technologies, Inc.

Inventor： Ning SHI ,  Brian R. YORK ,  Susumu OKAMURA ,  Suping SONG

IPC: G11B5/39

CPC classification number: G11B5/3929 ,  G11B5/3912

Abstract: Aspects of the present disclosure generally relate to magnetic recording heads (such as write heads of data storage devices) that include multilayer structures to facilitate targeted switching and relatively low coercivity. In one or more embodiments, a magnetic recording head includes an iron-cobalt (FeCo) layer having a crystalline structure that is a cubic lattice structure, a first crystalline layer formed of a first material, and a second crystalline layer between the first crystalline layer and the FeCo layer. The second crystalline layer is formed of a second material different from the first material, and the second crystalline layer interfaces both the FeCo layer and the first crystalline layer. The crystalline structure of the FeCo layer has a texture of .

公开(公告)号：US20220208220A1

公开(公告)日：2022-06-30

申请号：US17697859

申请日：2022-03-17

Applicant: Western Digital Technologies, Inc.

Inventor： 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

IPC: G11B5/115 ,  G11B5/31 ,  G11B5/127 ,  G11B5/187

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.

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

IPC: G11B5/115 ,  G11B5/53

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.

公开(公告)号：US20190392861A1

公开(公告)日：2019-12-26

申请号：US16560844

申请日：2019-09-04

Applicant: Western Digital Technologies, Inc.

Inventor： Zhanjie LI ,  Suping SONG ,  Kuok San HO

IPC: G11B5/31 ,  G11B5/37

Abstract: The present disclosure generally relates to magnetic media devices, and more specifically, to a magnetic media drive employing a magnetic recording head. The recording head includes a main pole, a trailing shield hot seed layer, a spin Hall layer disposed between the main pole and the trailing shield hot seed layer, and a spin-torque layer disposed between the main pole and the trailing shield hot seed layer. Spin-orbit torque (SOT) is generated from the spin Hall layer. The spin-torque layer magnetization switching or precession is induced by the SOT. The SOT based head reduces the switching current and the Vjump due to higher spin polarization ratio, which improves energy efficiency. In addition, the spin Hall layer and the spin-torque layer are easier to form compared to the conventional pseudo spin-valve structure.

公开(公告)号：US20190279663A1

公开(公告)日：2019-09-12

申请号：US16009046

申请日：2018-06-14

Applicant: Western Digital Technologies, Inc.

Inventor： Suping SONG ,  Zhanjie LI ,  Michael Kuok San HO ,  Quang LE ,  Alexander M. ZELTSER

IPC: G11B5/127 ,  G11B5/23 ,  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 at a media facing surface (MFS), a trailing shield at the MFS, and a heavy metal layer disposed between the main pole and the trailing shield at the MFS. Spin-orbit torque (SOT) is generated from the heavy metal layer and transferred to a surface of the main pole as a current passes through the heavy metal layer in a cross-track direction. The SOT executes a torque on the surface magnetization of the main pole, which reduces the magnetic flux shunting from the main pole to the trailing shield. With the reduced magnetic flux shunting from the main pole to the trailing shield, write-ability is improved.

公开(公告)号：US20190267029A1

公开(公告)日：2019-08-29

申请号：US16277947

申请日：2019-02-15

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

IPC: G11B5/147 ,  G11B5/31 ,  G11B5/23

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.

公开(公告)号：US20240379119A1

公开(公告)日：2024-11-14

申请号：US18229081

申请日：2023-08-01

Applicant: Western Digital Technologies, Inc.

Inventor： Muhammad ASIF BASHIR ,  Suping SONG ,  Yaguang WEI ,  Terence T. LAM ,  Petrus Antonius VAN DER HEIJDEN

IPC: G11B5/115

Abstract: The present disclosure generally relates to a magnetic recording system comprising a magnetic recording head. The magnetic recording head comprises a main pole disposed at a media facing surface (MFS). The main pole is disposed between a trailing shield and a leading shield, the trailing shield and the leading shield each extending to the MFS. A first lead is disposed between the main pole and the trailing shield, and the first lead is recessed from the MFS. A first portion of the first lead is disposed in contact with the main pole. A first insulating layer is disposed between and in contact with a second portion of the first lead and the main pole, and the first insulating layer being recessed from the MFS. The first lead and the first insulating layer direct a current through the main pole at a location recessed from the MFS.