公开(公告)号：US20250061956A1

公开(公告)日：2025-02-20

申请号：US18938199

申请日：2024-11-05

Applicant: Micron Technology, Inc.

Inventor： Livio Baldi ,  Marcello Mariani

IPC: G11C19/08 ,  G11B5/49 ,  G11C11/14 ,  G11C11/16 ,  H10N50/01 ,  H10N50/80

Abstract: A method of forming a memory device having magnetic tracks individually comprising a plurality of magnetic domains having domain walls, includes forming an elevationally outer substrate material of uniform chemical composition. The uniform composition material is partially etched into to form alternating regions of elevational depressions and elevational protrusions in the uniform composition material. A plurality of magnetic tracks is formed over and which angle relative to the alternating regions. Interfaces of immediately adjacent of the regions individually form a domain wall pinning site in individual of the magnetic tracks. Other methods, including memory devices independent of method, are disclosed.

公开(公告)号：US11894025B1

公开(公告)日：2024-02-06

申请号：US18053470

申请日：2022-11-08

Applicant: Marvell Asia Pte Ltd

Inventor： Kai Wu ,  Mats Oberg ,  Hao Fang

IPC: G11B11/105 ,  G11B7/00 ,  G11B5/012 ,  G11B5/49

CPC classification number: G11B5/012 ,  G11B5/4946

Abstract: A method for writing data to a magnetic data storage medium includes detecting whether the duration, before occurrence of a data transition, of data to be written exceeds a predetermined threshold, and, when the duration, before the occurrence of the data transition, of the data to be written exceeds the predetermined threshold, writing the data by applying an initial pulse and then maintaining a steady-state write current for a defined interval, and when the duration, before the occurrence of the data transition, of the data to be written is at most equal to the predetermined threshold, writing the data by applying the initial pulse without applying a steady-state write current before the data transition. The predetermined threshold may be determined by size of a magnetic bubble formed when writing a single bit to the magnetic data storage medium. A subsequent pulse may be applied following the defined interval.

公开(公告)号：US20240038261A1

公开(公告)日：2024-02-01

申请号：US17978480

申请日：2022-11-01

Applicant: SAE Magnetics (H.K.) Ltd.

Inventor： Ryuji FUJII ,  Shi Xiong CHEN ,  Zeng Hui ZHANG ,  Yong LEI ,  Yong Jun ZHANG

IPC: G11B5/31 ,  G11B5/127 ,  G11B5/49

CPC classification number: G11B5/3169 ,  G11B5/1276 ,  G11B5/3173 ,  G11B5/49

Abstract: The present disclosure discloses a magnetic head, a head gimbal assembly, a hard disk drive, and a method for processing a magnetic head. The method comprises irradiating at a fixed point proximal to the read/write part with a laser irradiation device until the read head and the write head are thermally expanded; orientating air bearing surfaces of a plurality of magnetic heads forming a magnetic strip toward a lapping surface of a lapping device after laser irradiation, holding the air bearing surfaces in place, lapping with the lapping device until the air bearing surfaces are coplanar; and disassembling the magnetic strip to obtain a lapped magnetic head. Through laser heating induced compensation, the heights of lapped read head and write head of the magnetic head meet their respective target values, ensuring the normal reading and writing of the storage medium of the magnetic disk.

公开(公告)号：US10984822B2

公开(公告)日：2021-04-20

申请号：US16928971

申请日：2020-07-14

Applicant: Marvell Asia Pte, Ltd.

Inventor： Mats Oberg ,  Hao Fang

IPC: G11B5/09 ,  G11B5/012 ,  G11B5/31 ,  G11B5/49 ,  G11B5/00

Abstract: The present disclosure describes aspects of pulse-based writing for magnetic storage media. In some aspects, a pulse-based writer of magnetic storage media determines that a string of data bits having a same polarity corresponds to a magnet longer than a threshold associated with a magnetic media writer. The pulse-based writer inserts, into the string of data bits, a transition to a polarity opposite to the same polarity of the string of data bits. The string of data bits including the inserted transition is then transmitted to the magnetic media writer to cause a write head of the writer to pulse while writing the magnet to magnetic storage media. Various aspects may also implement a control signal to mask a transition or control polarity of the magnetic media writer. By so doing, magnets may be written to the magnetic storage media more efficiently or with less distortion to neighboring tracks.

公开(公告)号：US10803899B2

公开(公告)日：2020-10-13

申请号：US16557035

申请日：2019-08-30

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

Inventor： Koji Ishii

IPC: G11B5/09 ,  G11B19/04 ,  G11B5/55 ,  G11B5/49

Abstract: A magnetic disk device includes a control circuit, and a disk unit including a plurality of magnetic disks, a plurality of magnetic heads configured to read or write data from or to the magnetic disks, a first actuator configured to move the magnetic heads, a plurality of second actuators each configured to move the corresponding magnetic head, and a switch circuit configured to connect the control circuit and one of the second actuators. The control circuit is configured to transmit to the disk unit an instruction in which one of the magnetic heads is specified, control one of the second actuators corresponding to the specified magnetic head to move the magnetic head via the switch circuit, and based on a signal from the one of the second actuators, determine whether an error occurs in the one of the second actuators.

公开(公告)号：US10777225B2

公开(公告)日：2020-09-15

申请号：US16018915

申请日：2018-06-26

Applicant: Western Digital Technologies, Inc.

Inventor： Pankaj Mehra ,  Bernd Lamberts ,  Sridhar Chatradhi ,  Jordan A. Katine

IPC: G06F3/06 ,  G11B5/66 ,  G11B5/74 ,  G11B5/82 ,  G11B5/49 ,  G11B5/48 ,  G11B5/667

Abstract: Disclosed herein are methods of using embedded disconnected circuits (EDC) in magnetic storage media to assist in reading data from and writing data to the magnetic storage media. A wireless activation signal is used to activate an EDC in a magnetic storage media. Once activated, the EDC may assist to record data in and/or read data from one or more memory locations of the magnetic storage media.

公开(公告)号：US10714142B2

公开(公告)日：2020-07-14

申请号：US16126422

申请日：2018-09-10

Applicant: Kabushiki Kaisha Toshiba

Inventor： Makoto Segawa ,  Fuyuki Tawada ,  Osamu Yoshida

IPC: G11B7/00 ,  G11B20/18 ,  G11B19/04 ,  G11B5/012 ,  G11B5/49

Abstract: According to one embodiment, a disk device includes a disk, a head that performs data read/write processing on a recording region of the disk, a controller that performs a media scan processing for detecting the presence or absence of a defect in a sector in the recording region of the disk in track unit. When the controller performs the media scan processing on a first sector and a second sector arranged in the track, and a third sector arranged between the first sector and the second sector, the controller performs skip processing in which the controller scans the first sector and the second sector, and does not scan the third sector.

公开(公告)号：US10109309B1

公开(公告)日：2018-10-23

申请号：US15694276

申请日：2017-09-01

Applicant: Western Digital Technologies, Inc.

Inventor： Pierre-Olivier Jubert ,  Kumar Srinivasan

IPC: G11B5/73 ,  G11B5/708 ,  G11B5/706 ,  G11B13/08 ,  G11B5/49 ,  G11B5/738 ,  H01F10/10 ,  H01F10/12 ,  G11B5/00

Abstract: A heat-assisted magnetic recording (HAMR) medium includes a perpendicular magnetic recording layer (typically a chemically-ordered FePt alloy), a seed/thermal barrier layer (typically MgO) below the recording layer, and a heat-sink layer with anisotropic thermal conductivity below the seed/thermal barrier layer. The in-plane thermal conductivity of the heat-sink layer is greater than its out-of-plane thermal conductivity. The heat-sink layer may be selected from hexagonal boron nitride (h-BN), hexagonal graphite, and the 6H polytype of hexagonal silicon carbide (6H-SiC). If the heat-sink layer is h-BN, the h-BN layer is formed on a seed layer and has its c-axis oriented out-of-plane (substantially orthogonal to the surface of the medium substrate).

公开(公告)号：US09773517B2

公开(公告)日：2017-09-26

申请号：US14685417

申请日：2015-04-13

Applicant: Seagate Technology LLC

Inventor： Kaizhong Gao ,  Edward Gage ,  Huaqing Yin ,  Yonghua Chen

IPC: G11B21/02 ,  G11B5/49 ,  G11B5/31 ,  G11B5/012 ,  G11B5/127 ,  G11B5/48

CPC classification number: G11B5/4984 ,  G11B5/012 ,  G11B5/1278 ,  G11B5/3116 ,  G11B5/4886

Abstract: A storage device includes a transducer head with multiple write elements having write poles of different sizes. For example, the transducer head may include two write poles of different width configured to write to a same surface of a storage medium. A controller of the storage device is configured to selectively engage one of the multiple write elements to write data to the storage medium.

公开(公告)号：US09437251B1

公开(公告)日：2016-09-06

申请号：US14579785

申请日：2014-12-22

Applicant: Western Digital (Fremont), LLC

Inventor： Steven C. Rudy ,  Luc Ving Chung ,  Christopher L. Beaudry ,  Shaoping Li ,  Jimmy J. Shen ,  Guolun Hao ,  Yingbo Zhang

IPC: G11B5/39 ,  G11B5/115 ,  G11B5/29 ,  G11B33/14 ,  G11B5/60 ,  G11B5/48 ,  G11B5/49 ,  G11B5/31

CPC classification number: G11B5/3163 ,  G11B5/115 ,  G11B5/1272 ,  G11B5/29 ,  G11B5/3912 ,  G11B5/3951 ,  G11B5/3977 ,  G11B5/4886 ,  G11B5/4976 ,  G11B5/6094 ,  G11B33/1493 ,  Y10T29/49032

Abstract: A method of making a magnetic head is provided. The method includes forming a first read sensor and a first electrical contact formed with a first shunt region. The method further includes forming a first mid-shield layer on the first read sensor, the first mid-shield layer being electrically connected to the first electrical contact. Additionally the method also includes forming a second mid-shield layer over the first mid-shield layer. Further, the method also includes forming a second read sensor over the second mid-shield layer, the second read sensor having a second electrical contact formed with a second shunt region electrically connected to the first shunt region.

Abstract translation: 提供一种制造磁头的方法。 该方法包括形成第一读取传感器和形成有第一分流区域的第一电触头。 该方法还包括在第一读取传感器上形成第一中间屏蔽层，第一中间屏蔽层电连接到第一电触点。 另外，该方法还包括在第一中间屏蔽层之上形成第二中间屏蔽层。 此外，该方法还包括在第二中间屏蔽层上形成第二读取传感器，第二读取传感器具有形成有电连接到第一分流区域的第二分流区域的第二电触点。