公开(公告)号：US20240282333A1

公开(公告)日：2024-08-22

申请号：US18637904

申请日：2024-04-17

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：US20230267953A1

公开(公告)日：2023-08-24

申请号：US17652066

申请日：2022-02-22

Applicant: Western Digital Technologies, Inc.

Inventor： Alexander GONCHAROV ,  Zhanjie LI ,  Terence T. LAM ,  Suping SONG

IPC: G11B5/31

CPC classification number: G11B5/3116 ,  G11B5/315

Abstract: The present disclosure relates to a magnetic recording head having an exchange biased leading shield or leading edge shield (LES). The LES is a bilayer structure. One or more layers are coupled below the LES such that the LES is disposed between the main pole and the one or more layers. The one or more layers exchange bias the LES such that the upper layer of the LES has a magnetization parallel to the magnetization of the trailing shield. The lower layer of the LES has a magnetization that is antiparallel to the magnetization of the upper layer of the LES. The one or more layers set the preferred direction for the lower layer of the LES and sets the LES as a two-domain state without relying upon the anisotropy field (Hk) of either the upper or lower layers of the LES.

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

IPC: G11B5/31 ,  G11B5/127 ,  G11B5/012 ,  G11B5/235 ,  G11B5/02

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.

公开(公告)号：US20200327899A1

公开(公告)日：2020-10-15

申请号：US16912572

申请日：2020-06-25

Applicant: Western Digital Technologies, Inc.

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

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

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：US20190325902A1

公开(公告)日：2019-10-24

申请号：US16459064

申请日：2019-07-01

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: 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, and wherein the driving current comprises an AC component with a duty cycle selected based at least in part on a power constraint. 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, wherein the driving current comprises an AC component with a duty cycle based at least in part on a power constraint.

公开(公告)号：US20190279665A1

公开(公告)日：2019-09-12

申请号：US15976684

申请日：2018-05-10

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.