公开(公告)号：US20240304211A1

公开(公告)日：2024-09-12

申请号：US18630195

申请日：2024-04-09

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

Inventor： Hiroshi ISOKAWA

IPC: G11B5/012 ,  G11B5/00 ,  G11B5/23 ,  G11B5/31 ,  G11B5/39 ,  G11B5/48 ,  G11B25/04

CPC classification number: G11B5/012 ,  G11B25/043 ,  G11B2005/0018 ,  G11B2005/0024 ,  G11B5/23 ,  G11B5/3116 ,  G11B5/3912 ,  G11B5/3983 ,  G11B5/4813

Abstract: According to one embodiment, among a plurality of magnetic heads, the larger the magnetic pole width of the magnetic pole of the magnetic head in the width direction of a recording track formed in a recording layer or the larger an area width of the magnetic head capable of reading the magnetic characteristics of an area of the recording layer on which magnetic recording has been carried out by means of the magnetic head, the farther is the magnetic head arranged outwardly from the vicinity of the center in the parallel arrangement direction of the magnetic disks.

公开(公告)号：US20240144964A1

公开(公告)日：2024-05-02

申请号：US18408014

申请日：2024-01-09

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：US11935569B2

公开(公告)日：2024-03-19

申请号：US18125289

申请日：2023-03-23

Applicant: Seagate Technology LLC

Inventor： James Gary Wessel ,  Jason Gadbois

IPC: G11B5/31 ,  B24B37/005 ,  G11B5/39 ,  G11B5/60

CPC classification number: G11B5/3169 ,  B24B37/005 ,  G11B5/3116 ,  G11B5/3166 ,  G11B5/3906 ,  G11B5/6011 ,  Y10T29/49032 ,  Y10T29/49048 ,  Y10T29/5313

Abstract: The present invention is directed to the fabrication of head sliders for use in hard disk drives, and in particular the provision and usage of electrical bond pads on the slider surface structure to accommodate needs of the fabrication process as well as slider operation within a disk drive.

公开(公告)号：US11869548B1

公开(公告)日：2024-01-09

申请号：US17183161

申请日：2021-02-23

Applicant: Western Digital Technologies, Inc.

Inventor： Muhammad Asif Bashir ,  Petrus Antonius Van Der Heijden ,  James Terrence Olson ,  Alexander Goncharov ,  Zhigang Bai ,  Yunfei Ding

IPC: G11B5/00 ,  G11B5/31

CPC classification number: G11B5/315 ,  G11B5/3116

Abstract: Aspects of the present disclosure generally relate to a magnetic recording head assembly that includes an external alternating current (AC) source. A magnetic recording head of the magnetic recording head assembly includes a conductive structure between a main pole and a trailing shield. The conductive structure includes a conductive layer, and the conductive layer is nonmagnetic. The magnetic recording head assembly also includes an external AC source to supply AC current that flows through the conductive structure. In one aspect, the conductive structure is between a coil structure and the trailing shield, and the external AC source is coupled to the coil structure. The conductive structure and the external AC source facilitate consistently providing an enhanced AC writing field to facilitate effective and reliable writing, high ADC, high SNR, and reduced jitter.

公开(公告)号：US11651783B1

公开(公告)日：2023-05-16

申请号：US17652067

申请日：2022-02-22

Applicant: Western Digital Technologies, Inc.

Inventor： Alexander Goncharov

IPC: G11B5/39 ,  G11B5/187 ,  G11B5/127 ,  G11B5/11 ,  G11B5/60 ,  G11B5/31

CPC classification number: G11B5/3912 ,  G11B5/1278 ,  G11B5/187 ,  G11B5/3116 ,  G11B5/6082 ,  G11B5/11 ,  G11B5/31

Abstract: The present disclosure relates to a magnetic recording head having dual layer leading shield or leading edge shield (LES). The layer closest to the main pole of the magnetic recording head has a shallow flare to enhance shape anisotropy while the layer farthest away from the main pole has a steep flare to initiate reversal of the direction of magnetization for the layer during the initialization. The layer closest to the main pole will retain a direction of magnetization that matches the direction of magnetization of the initialization direction. Both layers are sufficiently thick to ensure a two domain state that is favorable from an energy balance point of view.

公开(公告)号：US20190228795A1

公开(公告)日：2019-07-25

申请号：US15880458

申请日：2018-01-25

Applicant: Yoshitaka SASAKI ,  Hiroyuki ITO ,  Kazuki SATO ,  Hironori ARAKI ,  Yukinori IKEGAWA ,  Yoji NOMURA

Inventor： Yoshitaka SASAKI ,  Hiroyuki ITO ,  Kazuki SATO ,  Hironori ARAKI ,  Yukinori IKEGAWA ,  Yoji NOMURA

IPC: G11B5/39

CPC classification number: G11B5/3116 ,  G11B5/11 ,  G11B5/112 ,  G11B5/1278 ,  G11B5/315 ,  G11B5/3163 ,  G11B5/6082 ,  Y10T29/49046 ,  Y10T29/49052

Abstract: A first side shield has a first sidewall and a second sidewall, and a second side shield has a third sidewall and a fourth sidewall. The first to fourth sidewalls have first to fourth edges, respectively, that are farthest from a top surface of a substrate. The distance between a rear end of the first edge and a rear end of the third edge in a track width direction is greater than the distance between a front end of the first edge and a front end of the third edge in the track width direction. The distance between the second edge and the fourth edge in the track width direction increases with increasing distance from the medium facing surface.

公开(公告)号：US20180261242A1

公开(公告)日：2018-09-13

申请号：US15975257

申请日：2018-05-09

Applicant: Western Digital (Fremont), LLC

Inventor： Yu PAN ,  Yugang WANG ,  ZHIGANG BAI ,  Tao LIN ,  Peng Zhao

IPC: G11B5/31 ,  G11B5/127 ,  G11B5/23 ,  G11B5/187 ,  G11B5/11

CPC classification number: G11B5/3116 ,  G11B5/112 ,  G11B5/1278 ,  G11B5/1871 ,  G11B5/23 ,  G11B5/232 ,  G11B5/315

Abstract: A magnetic write apparatus has a media-facing surface (MFS), a pole, a write gap, a top shield and coil(s). The pole includes a yoke and a pole tip. The pole tip includes a bottom, a top wider than the bottom and first and second sides. The pole tip has a height between the top and the bottom. At least part of the top of the pole tip is convex in a cross-track direction between the first and second sides such that the height at the MFS is larger between the first and second sides than at the first and second sides. The height increases in a yoke direction perpendicular to the MFS. The write gap is adjacent to and conformal with the top of the pole at the MFS and is between part of the top shield and the pole. The top shield is concave at the MFS.

公开(公告)号：US20180261241A1

公开(公告)日：2018-09-13

申请号：US15703089

申请日：2017-09-13

Applicant: Kabushiki Kaisha Toshiba

Inventor： Naoyuki NARITA ,  Hitoshi IWASAKI ,  Mariko SHIMIZU ,  Katsuhiko KOUI ,  Kenichiro YAMADA

IPC: G11B5/31 ,  G11B5/66 ,  G11B5/48 ,  G11B5/187

CPC classification number: G11B5/315 ,  G11B5/187 ,  G11B5/3116 ,  G11B5/312 ,  G11B5/4813 ,  G11B5/4826 ,  G11B5/66

Abstract: According to one embodiment, a magnetic head includes a magnetic pole, and a first shield, and a stacked body provided between the magnetic pole and the first shield. The stacked body includes a first layer, a second layer and a third layer. The first layer includes at least one first element selected from the group consisting of Fe, Co, and Ni. The second layer is provided between the magnetic pole and the first layer, and includes at least one second element selected from the group consisting of Cr, V, Mn, Ti, and Sc. The third layer is provided between the first layer and the first shield, and includes at least one third element selected from the group consisting of Cr, V, Mn, Ti, and Sc.

公开(公告)号：US20180247663A1

公开(公告)日：2018-08-30

申请号：US15444169

申请日：2017-02-27

Applicant: International Business Machines Corporation

Inventor： Robert G. Biskeborn ,  Calvin S. Lo

IPC: G11B5/39 ,  G11B5/008

CPC classification number: G11B5/3153 ,  G11B5/00813 ,  G11B5/00826 ,  G11B5/147 ,  G11B5/1871 ,  G11B5/23 ,  G11B5/265 ,  G11B5/2652 ,  G11B5/29 ,  G11B5/3116 ,  G11B5/3945 ,  G11B5/3967

Abstract: An apparatus, according to one embodiment, includes: an array of write transducers, each write transducer having: a first write pole having a pole tip extending from a media facing side of the first write pole, a second write pole having a pole tip extending from a media facing side of the second write pole, a nonmagnetic write gap between the pole tips of the write poles, and a high moment layer between the write gap and the pole tip of the second write pole. The high moment layer has a higher magnetic moment than a magnetic moment of the pole tip of the second write pole. Moreover, the high moment layer protrudes beyond a plane extending along a media facing side of the second pole tip. Other systems, methods, and computer program products are described in additional embodiments.

公开(公告)号：US09990942B1

公开(公告)日：2018-06-05

申请号：US15357105

申请日：2016-11-21

Applicant: Headway Technologies, Inc.

Inventor： Yue Liu ,  Ying Liu ,  Yuhui Tang ,  Jiun-Ting Lee ,  Moris Dovek ,  Yiming Wang

IPC: G11B5/187 ,  G11B5/31 ,  G11B5/127 ,  G11B5/39 ,  G11B5/008

CPC classification number: G11B5/3116 ,  G11B5/00826 ,  G11B5/1278 ,  G11B5/187 ,  G11B5/3912

Abstract: A PMR writer is disclosed with an all wrap around (AWA) shield design in which one or more of the leading shield, side shields, and trailing shield (TS) structure (except the hot seed layer) at the air bearing surface (ABS) are comprised of an alloy having a damping parameter α of ≥0.04 to minimize wide area track erasure (WATE). The TS structure comprises two outer magnetic layers with an 8-16 kiloGauss (kG) saturation magnetic moment on each side of a center stack with a lower write gap, a middle hot seed layer having a 19-24 kG saturation magnetic moment, and an upper magnetic layer with a 16-24 kG saturation magnetic moment, and each having a first cross-track width. The hot seed layer, upper TS magnetic layer and an overlying PP3 trailing shield promote improved area density capability (ADC).