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.

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.

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

CPC classification number: G11B5/315 ,  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 (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.

公开(公告)号：US20200342899A1

公开(公告)日：2020-10-29

申请号：US16857423

申请日：2020-04-24

Applicant: Western Digital Technologies, Inc.

Inventor： James Terrence OLSON ,  Hiroyuki HOSHIYA ,  Alexander GONCHAROV ,  Masato SHIIMOTO ,  Mikito SUGIYAMA

IPC: G11B5/127 ,  G11B5/31 ,  G11B5/23 ,  G11B5/02 ,  G11B5/39 ,  G11B5/66 ,  G11B5/455 ,  G11B5/714

Abstract: A write head for a data storage device comprises a main pole, a trailing shield, and a write-field enhancement structure disposed in a write gap between the main pole and the trailing shield. The write-field enhancement structure comprises a non-magnetic spacer, a non-magnetic layer, and a magnetic DC-field-generation (DFG) layer. The DFG layer is sandwiched between the non-magnetic layer and the non-magnetic spacer. The write head also includes at least one magnetic notch adjacent to at least one of the main pole or the trailing shield. The non-magnetic spacer is adjacent to a magnetic notch. Some embodiments include multiple magnetic notches. Also disclosed are data storage devices comprising such write heads.

公开(公告)号：US20200234729A1

公开(公告)日：2020-07-23

申请号：US16748881

申请日：2020-01-22

Applicant: Western Digital Technologies, Inc.

Inventor： James Terrence OLSON ,  Hiroyuki HOSHIYA ,  Alexander GONCHAROV ,  Masato SHIIMOTO ,  Mikito SUGIYAMA

IPC: G11B5/39 ,  G11B5/31

Abstract: Disclosed herein are magnetic write heads for providing spin-torque-assisted write field enhancement, and hard disk drives comprising such magnetic write heads. Within the write gap, each magnetic write head comprises a main pole, a trailing shield, a spacer disposed between the main pole and the trailing shield, a non-magnetic layer disposed between the main pole and the trailing shield, and a magnetic DC-field-generation (DFG) layer adjacent to the spacer and disposed between the spacer and the non-magnetic layer. In some embodiments, the DFG layer is the only magnetic layer within the write gap that is not adjacent to the main pole or the trailing shield.

公开(公告)号：US20240321296A1

公开(公告)日：2024-09-26

申请号：US18228523

申请日：2023-07-31

Applicant: Western Digital Technologies, Inc.

Inventor： Alexander GONCHAROV ,  Muhammad ASIF BASHIR ,  Yunfei DING

IPC: G11B5/31

CPC classification number: G11B5/3133 ,  G11B5/3143 ,  G11B2005/0024

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.

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：US20200372929A1

公开(公告)日：2020-11-26

申请号：US16991971

申请日：2020-08-12

Applicant: Western Digital Technologies, Inc.

Inventor： Quang LE ,  Yongchul AHN ,  Susumu OKAMURA ,  Zheng GAO ,  Alexander GONCHAROV ,  Muhammad ASIF BASHIR ,  Petrus Antonius VAN DER HEIJDEN ,  James Mac FREITAG

IPC: G11B5/31 ,  G11B5/115 ,  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. The head includes a trailing shield, a main pole, an STO disposed between the trailing shield and the main pole, and a non-magnetic conductive structure adjacent to the main pole and in contact with the STO. The STO includes an FGL and an SPL, and the FGL is disposed between the main pole and the SPL. The FGL includes a side extending over the main pole and at least a portion of the non-magnetic conductive structure. With the FGL disposed proximate to the main pole and over at least a portion of the non-magnetic conductive structure, current crowding and disturbance from the trailing shield are minimized.

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：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.