公开(公告)号：US12068008B2

公开(公告)日：2024-08-20

申请号：US18102975

申请日：2023-01-30

Applicant: Headway Technologies, Inc.

Inventor： Wenyu Chen ,  Shohei Kawasaki ,  Tetsuya Roppongi

IPC: G11B5/235 ,  G11B5/11 ,  G11B5/127 ,  G11B5/31 ,  G11B5/00 ,  G11B5/39

CPC classification number: G11B5/3146 ,  G11B5/11 ,  G11B5/1278 ,  G11B5/235 ,  G11B5/3133 ,  G11B5/314 ,  G11B5/3163 ,  G11B2005/0024 ,  G11B5/3912 ,  G11B5/3919 ,  G11B2005/3996

Abstract: A STRAMR structure is disclosed. The STRAMR structure can include a spin torque oscillator (STO) device in a WG provided between the mail pole (MP) trailing side and a trailing shield. The STO device, includes: a flux guiding layer that has a negative spin polarization (nFGL) with a magnetization pointing substantially parallel to the WG field without the current bias and formed between a first spin polarization preserving layer (ppL1) and a second spin polarization preserving layer (ppL2); a positive spin polarization (pSP) layer that adjoins the TS bottom surface; a non-spin polarization preserving layer (pxL) contacting the MP trailing side; a first negative spin injection layer (nSIL1) between the ppL2 and a third spin polarization preserving layer (ppL3); and a second negative spin injection layer (nSIL2) between the ppL3 and the pxL, wherein the nFGL, nSIL1, and nSIL2 have a spin polarization that is negative.

公开(公告)号：US20240135961A1

公开(公告)日：2024-04-25

申请号：US18359982

申请日：2023-07-26

Applicant: KABUSHIKI KAISHA TOSHIBA

Inventor： Tazumi NAGASAWA ,  Satoshi SHIROTORI ,  Akira KIKITSU ,  Yoshihiro HIGASHI

IPC: G11B5/11 ,  G11B5/127 ,  G11B5/37 ,  G11B5/39

CPC classification number: G11B5/11 ,  G11B5/1272 ,  G11B5/374 ,  G11B5/3912

Abstract: According to one embodiment, a magnetic sensor includes first to sixth shields, first and second magnetic layers, a first member, and first to fourth terminals. The first magnetic layer is provided between the first shield and the second shield. The first magnetic layer is between the third shield and the fourth shield in the second direction. The second magnetic layer is provided between the first magnetic layer and the second shield. The second magnetic layer is between the fifth shield and the sixth shield in the second direction. The second magnetic layer is electrically connected to the fifth shield and the sixth shield. The first member includes a first region and a second region. The first region is provided between the third shield and the first magnetic layer. The second region is provided between the first magnetic layer and the fourth shield.

公开(公告)号：US11756577B2

公开(公告)日：2023-09-12

申请号：US17534574

申请日：2021-11-24

Applicant: Headway Technologies, Inc.

Inventor： Yan Wu

IPC: G11B5/012 ,  G11B5/127 ,  G11B5/02 ,  G11B5/31 ,  G11B5/11

CPC classification number: G11B5/012 ,  G11B5/02 ,  G11B5/11 ,  G11B5/1278 ,  G11B5/315 ,  G11B5/3133 ,  G11B5/3146

Abstract: A spin injection assisted magnetic recording structure is disclosed wherein a ferromagnetic (FM) layer and at least one spin preservation (SP) layer are formed between a main pole (MP) trailing side and a write shield (WS). Current (Ia) flows between the MP and WS, or is injected into the FM layer. As a result, the spin polarized electrons from the FM layer, which flow across one or two SP layers to generate a magnetization that enhances one or both of a local WS magnetization and return field, and a local MP magnetization and write field, respectively. A lead to the FM layer may be stitched to enable lower resistance and improve reliability. The FM layer may be recessed from the ABS to allow more overlap with the SP layer for lower current density while maintaining performance. Higher linear density and area density capability, and better reliability are achieved.

公开(公告)号：US20230274761A1

公开(公告)日：2023-08-31

申请号：US18142938

申请日：2023-05-03

Applicant: Western Digital Technologies, Inc.

Inventor： Quan-Chiu Harry LAM

IPC: G11B5/31 ,  G11B5/48 ,  G11B5/187 ,  G11B5/11 ,  G11B5/127

CPC classification number: G11B5/315 ,  G11B5/484 ,  G11B5/187 ,  G11B5/3153 ,  G11B5/11 ,  G11B5/1276

Abstract: Aspects of the present disclosure generally relate to a magnetic recording head that includes a main pole, a leading shield, a first side shield disposed on a first side of the main pole, a second side shield disposed on a second side of the main pole, and a trailing shield. The trailing shield is disposed on a trailing side of the main pole. One or more approaches are disclosed to control return-fluxes. In some embodiments, at least one of the upper return pole, the leading shield, the trailing shield, the first side shield, and the second side shield includes a laminate structure having at least a pair of ferromagnetic layers, and a non-magnetic spacer layer disposed between adjacent ferromagnetic layers. In some embodiments, one or more shunts are positioned, such as connecting the leading shield to the upper return pole in order to create circuits to control magnetic flux.

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：US11670331B2

公开(公告)日：2023-06-06

申请号：US17672016

申请日：2022-02-15

Applicant: KABUSHIKI KAISHA TOSHIBA ,  TOSHIBA ELECTRONIC DEVICES & STORAGE CORPORATION

Inventor： Kaori Kimura ,  Akihiko Takeo ,  Takuya Matsumoto

IPC: G11B5/60 ,  G11B5/127 ,  G11B5/11 ,  G11B5/00

CPC classification number: G11B5/607 ,  G11B5/11 ,  G11B5/1278 ,  G11B5/6076 ,  G11B2005/0021

Abstract: According to one embodiment, a magnetic disk device includes a rotatable disk-shaped recording medium, a magnetic head including a write head having a main magnetic pole that applies a recording magnetic field to the recording medium, an assist element that assists magnetic recording by the main magnetic pole, and a plurality of thermal actuators that control a head gradient with respect to the recording medium, and a controller which includes a detection unit configured to detect deterioration of the magnetic head, and changes a head gradient of the magnetic head by the thermal actuator according to the detected deterioration.

公开(公告)号：US09940951B2

公开(公告)日：2018-04-10

申请号：US15053211

申请日：2016-02-25

Applicant: Western Digital (Fremont), LLC

Inventor： Jinqiu Zhang ,  Feng Liu ,  Xiaoyu Yang ,  Ming Jiang ,  Xiaotian Zhou ,  Zeyu Ma ,  Hai Sun

IPC: G11B5/235 ,  G11B5/11 ,  G11B5/127 ,  G11B5/23 ,  G11B5/187 ,  G11B5/10 ,  G11B5/60 ,  H01L21/027 ,  H01L21/3213 ,  G11B5/147 ,  G11B5/31

CPC classification number: G11B5/1278 ,  G11B5/10 ,  G11B5/11 ,  G11B5/112 ,  G11B5/147 ,  G11B5/187 ,  G11B5/1878 ,  G11B5/232 ,  G11B5/235 ,  G11B5/3116 ,  G11B5/313 ,  G11B5/3146 ,  G11B5/315 ,  G11B5/3163 ,  G11B5/6082 ,  H01L21/0272 ,  H01L21/32134 ,  H01L21/32139 ,  Y10T29/49032 ,  Y10T29/49041 ,  Y10T29/49043

Abstract: A perpendicular magnetic recording (PMR) writer is configured to magnetically record data on a rotatable disk surface. The PMR writer including a pole tip, side shields, an air-bearing surface (ABS) region, a yoke region comprising Silicon Dioxide (SiO2), side gaps and a plurality of throat regions. The side gaps are arranged respectively between the pole tip and the side shields and include SiO2. A side gap width of the plurality of throat regions increases with a side shield throat height above the ABS region for each of the throat regions. The side gap width has a different width variation in each of the throat regions.

公开(公告)号：US09928858B1

公开(公告)日：2018-03-27

申请号：US15702571

申请日：2017-09-12

Applicant: Seagate Technology LLC

Inventor： Zhe Shen ,  Zuxuan Lin ,  Lei Lu ,  Jian Zhong

IPC: G11B5/31 ,  G11B19/04 ,  G11B5/11 ,  G11B5/127

CPC classification number: G11B5/3116 ,  G11B5/11 ,  G11B5/1278 ,  G11B5/315 ,  G11B5/3166 ,  G11B5/3196 ,  G11B19/048

Abstract: A method that includes supplying a predetermined signal to a write head having side shields. The method also includes performing, by the write head, a recording operation on a surface of a data storage medium, when the predetermined signal is supplied to the write head, to provide a recorded magnetization pattern. The method further includes carrying out measurements on a portion of the recorded magnetization pattern influenced by a magnetization of the side shields. The measurements are employed to determine whether a reversed side shield magnetization condition is present in the write head.

公开(公告)号：US20180068678A1

公开(公告)日：2018-03-08

申请号：US15808796

申请日：2017-11-09

Applicant: International Business Machines Corporation

Inventor： Robert G. Biskeborn ,  Jason Liang ,  Calvin S. Lo ,  Andrew C. Ting

IPC: G11B5/265 ,  G11B5/11 ,  G11B5/60 ,  G11B5/48 ,  G11B5/39 ,  G11B5/187 ,  G11B5/008 ,  G11B5/29 ,  G11B5/255

CPC classification number: G11B5/265 ,  G11B5/0083 ,  G11B5/11 ,  G11B5/1871 ,  G11B5/255 ,  G11B5/29 ,  G11B5/3109 ,  G11B5/3912 ,  G11B5/3967 ,  G11B5/4893 ,  G11B5/60

Abstract: An apparatus according to one embodiment includes a module having a substrate, read and write transducers positioned towards a media facing side of the module, and a closure. The write transducers include write poles having media facing sides with zero or near-zero recession from a plane extending along the media facing side of a substrate of the module. The read transducers each have two shields. Media facing sides of the two shields are recessed a same amount from the plane, and are more recessed from the plane than the write poles.

公开(公告)号：US20180025745A1

公开(公告)日：2018-01-25

申请号：US15677145

申请日：2017-08-15

Applicant: WESTERN DIGITAL (FREMONT), LLC

Inventor： Feng Liu ,  Zhanjie LI ,  ZHIGANG BAI ,  Yi WANG

IPC: G11B5/31 ,  G11B5/127 ,  G11B5/11

CPC classification number: G11B5/3116 ,  G11B5/11 ,  G11B5/1278 ,  G11B5/23 ,  G11B5/3146 ,  G11B5/315

Abstract: A magnetic write apparatus has a media-facing surface (MFS), a pole having leading and trailing surfaces, a trailing shield having a pole-facing surface, a write gap and coil(s). The pole's trailing surface has a portion adjoining the MFS and oriented at a nonzero, acute bevel angle from a direction perpendicular to the MFS. The pole-facing surface includes a first portion adjoining the MFS and oriented at a first angle substantially the same as the bevel angle, a second portion oriented at a second angle greater than the first trailing shield angle, and a third portion oriented at a third angle substantially the same as the first angle. The write gap has first, second and third thicknesses adjacent to the first, second and third portions of the pole-facing surface, respectively. The first thickness is constant. The second thickness varies. The third thickness is constant and greater than the first thickness.