公开(公告)号：US09916868B1

公开(公告)日：2018-03-13

申请号：US15229967

申请日：2016-08-05

Applicant: Seagate Technology LLC

Inventor： Kangkang Wang ,  Xiaobin Zhu ,  Ganping Ju ,  Kai Chieh Chang ,  Yingguo Peng ,  Timothy J. Klemmer ,  Jan-Ulrich Thiele ,  Pin-Wei Huang

IPC: G11B27/36 ,  G11B7/1263 ,  G11B5/024 ,  G11B5/09 ,  G11B7/1267 ,  G11B5/00

CPC classification number: G11B27/36 ,  G01R33/0325 ,  G11B5/024 ,  G11B5/09 ,  G11B5/4555 ,  G11B7/1263 ,  G11B7/1267 ,  G11B2005/0021

Abstract: An apparatus comprises a spindle to rotate a magnetic recording medium and a magnetic field generator to expose a track of the medium to a DC magnetic field. The magnetic field generator is configured to saturate the track during an erase mode and reverse the DC magnetic field impinging the track during a writing mode. A laser arrangement heats the track during the erase mode and, during the writing mode, heats the track while the track is exposed to the reversed DC magnetic field so as to write a magnetic pattern thereon. A reader reads the magnetic pattern and generates a read signal. A processor is coupled to the reader and configured to determine an anisotropy parameter using the read signal. The apparatus can further comprise a Kerr sensor that generates a Kerr signal using the magnetic pattern.

公开(公告)号：US09911446B1

公开(公告)日：2018-03-06

申请号：US15640924

申请日：2017-07-03

Applicant: Seagate Technology LLC

Inventor： Joachim Ahner ,  David M. Tung ,  Ganping Ju ,  Philip L. Steiner ,  Thomas P. Nolan ,  Thomas Y. Chang ,  Pin-Wei Huang ,  Kaizhong Gao ,  Timothy Klemmer ,  David S. Kuo

IPC: G11B11/00 ,  G11B5/66 ,  G11B5/65 ,  G11B5/00

CPC classification number: G11B5/66 ,  G11B5/02 ,  G11B2005/0021 ,  G11B2005/0024

Abstract: A three dimensional magnetic recording media can consist of a coupling layer disposed between first and second vertically stacked recording layers. The coupling layer can provide exchange or antiferromagnetic coupling and allow the respective recording layers to be individually heat selected to different first and second coupling strengths through application of heat from a heat source.

公开(公告)号：US09443544B1

公开(公告)日：2016-09-13

申请号：US13965976

申请日：2013-08-13

Applicant: Seagate Technology LLC

Inventor： Yingguo Peng ,  Jan-Ulrich Thiele ,  Ganping Ju ,  Thomas Patrick Nolan ,  Yinfeng Ding ,  Alexander Qihong Wu

IPC: G11B5/66 ,  G11B5/73

CPC classification number: G11B5/73 ,  G11B5/66

Abstract: A magnetic stack includes multiple granular layers, at least one of the multiple granular layers is a magnetic layer that includes exchange coupled magnetic grains separated by a segregant having Ms greater than 100 emu/cc. Each of the multiple granular layers have anisotropic thermal conductivity.

公开(公告)号：US20140127533A1

公开(公告)日：2014-05-08

申请号：US14154018

申请日：2014-01-13

Applicant: Seagate Technology LLC

Inventor： Shuaigang Xiao ,  Thomas Young Chang ,  Yingguo Peng ,  David S. Kuo ,  Kaizhong Gao ,  Thomas P. Nolan ,  Ganping Ju

IPC: G11B5/73 ,  G11B5/84

CPC classification number: G11B5/7325 ,  G11B5/84 ,  G11B5/855

Abstract: A perpendicular magnetic media includes a substrate, a patterned template, a seed layer and a magnetic layer. The patterned template is formed on the substrate and includes a plurality of growth sites that are evenly spaced apart from each other. The seed layer is formed over the patterned template and the exposed areas of the substrate. Magnetic material is sputter deposited onto the seed layer with one grain of the magnetic material nucleated over each of the growth sites. The grain size distribution of the magnetic material is reduced by controlling the locations of the growth sites which optimizes the performance of the perpendicular magnetic media.

Abstract translation: 垂直磁性介质包括衬底，图案化模板，种子层和磁性层。 图案化模板形成在基板上并且包括彼此均匀间隔开的多个生长位点。 种子层形成在图案化模板和基板的暴露区域上。 将磁性材料溅射沉积到种子层上，其中一颗磁性材料成核在每个生长位点上。 通过控制优化垂直磁性介质性能的生长部位的位置来减小磁性材料的粒度分布。

公开(公告)号：US20130209835A1

公开(公告)日：2013-08-15

申请号：US13836521

申请日：2013-03-15

Applicant: SEAGATE TECHNOLOGY LLC

Inventor： Jiaoming Qui ,  Yonghua Chen ,  Ganping Ju ,  Thomas P. Nolan

IPC: G11B5/84 ,  G11B5/64 ,  G11B5/66

CPC classification number: G11B5/85 ,  B32B15/01 ,  B32B15/017 ,  B32B15/018 ,  B32B2307/208 ,  B32B2307/706 ,  B32B2457/00 ,  C21D1/26 ,  C21D8/12 ,  C21D9/0068 ,  C21D2211/004 ,  C21D2281/02 ,  C22C5/04 ,  C22C30/00 ,  C22C38/002 ,  C22F1/14 ,  C23C14/165 ,  C23C14/221 ,  C23C14/28 ,  C23C14/3464 ,  C23C14/35 ,  C23C14/5806 ,  C23C14/5833 ,  C23C14/5873 ,  G11B5/647 ,  G11B5/65 ,  G11B5/653 ,  G11B5/66 ,  G11B5/732 ,  G11B5/84 ,  G11B5/851

Abstract: A method involves depositing a seed layer comprising at least A1 phase FePt. A main layer of A1 phase FePt is deposited over the seed layer. The main layer includes FePt of a different stoichiometry than the seed layer. The seed and main layers are annealed to convert the A1 phase FePt to L10 phase FePt. The annealing involves heating the substrate prior to depositing at least part of the A1 phase FePt of the main or seed layers.

Abstract translation: 一种方法包括沉积包含至少Al相FePt的种子层。 A1相FePt的主层沉积在种子层上。 主层包括与种子层不同的化学计量比的FePt。 将种子和主层退火以将Al相FePt转化为L10相FePt。 退火包括在沉积主层或种子层的Al相FePt的至少一部分之前加热衬底。

公开(公告)号：US10930840B2

公开(公告)日：2021-02-23

申请号：US16255698

申请日：2019-01-23

Applicant: Seagate Technology LLC

Inventor： Cheng Wang ,  Pin-Wei Huang ,  Ganping Ju ,  Kuo-Hsing Hwang

IPC: H01L43/02 ,  H01L43/10 ,  H01L27/22 ,  H01L43/08

Abstract: A memristor may include an exchange-coupled composite (ECC) portion to provide three or more nonvolatile magneto-resistive states. The ECC portion may include a continuous layer and a granular layer magnetically exchange coupled to the continuous layer. A plurality of memristors may be used in a system to, for example, define a neural network.

公开(公告)号：US20190229260A1

公开(公告)日：2019-07-25

申请号：US16255698

申请日：2019-01-23

Applicant: Seagate Technology LLC

Inventor： Cheng Wang ,  Pin-Wei Huang ,  Ganping Ju ,  Kuo-Hsing Hwang

IPC: H01L43/10 ,  H01L27/22 ,  H01L43/02

Abstract: A memristor may include an exchange-coupled composite (ECC) portion to provide three or more nonvolatile magneto-resistive states. The ECC portion may include a continuous layer and a granular layer magnetically exchange coupled to the continuous layer. A plurality of memristors may be used in a system to, for example, define a neural network.

公开(公告)号：US09940962B2

公开(公告)日：2018-04-10

申请号：US14839441

申请日：2015-08-28

Applicant: Seagate Technology LLC

Inventor： Jan-Ulrich Thiele ,  Yinfeng Ding ,  YingGuo Peng ,  Kai-Chieh Chang ,  Timothy John Klemmer ,  Li Gao ,  Yukiko Kubota ,  Ganping Ju

IPC: G11B5/65 ,  G11B5/66 ,  C22C5/04 ,  G11B5/00

CPC classification number: G11B5/653 ,  C22C5/04 ,  G11B5/66 ,  G11B2005/0021

Abstract: In some embodiments, a thermally assisted data recording medium has a recording layer formed of iron (Fe), platinum (Pt) and a transition metal T selected from a group consisting of Rhodium (Rh), Ruthenium (Ru), Osmium (Os) and Iridium (Ir) to substitute for a portion of the Pt content as FeYPtY-XTX with Y in the range of from about 20 at % to about 80 at % and X in the range of from about 0 at % to about 20 at %.

公开(公告)号：US09779771B1

公开(公告)日：2017-10-03

申请号：US15083735

申请日：2016-03-29

Applicant: Seagate Technology LLC

Inventor： Kangkang Wang ,  Yingguo Peng ,  Ganping Ju ,  Xiaobin Zhu ,  Li Gao ,  Yinfeng Ding ,  Kai Chieh Chang ,  Timothy J. Klemmer ,  Yukiko Kubota ,  Jan-Ulrich Thiele ,  Thomas P. Nolan

IPC: G11B5/65 ,  G11B5/72 ,  G11B5/00 ,  G11B5/66

CPC classification number: G11B5/653 ,  G11B5/66 ,  G11B5/72 ,  G11B5/82 ,  G11B2005/0021

Abstract: A stack includes a substrate, a magnetic recording layer comprising FePtX disposed over the substrate, and a capping layer disposed on the magnetic recording layer. The capping layer comprises Co; at least one rare earth element; one or more elements selected from a group consisting of Fe and Pt; and an amorphizing agent comprising one to three elements selected from a group consisting of B, Zr, Ta, Cr, Nb, W, V, and Mo.

公开(公告)号：US09589588B2

公开(公告)日：2017-03-07

申请号：US15149361

申请日：2016-05-09

Applicant: Seagate Technology LLC

Inventor： Kangkang Wang ,  Xiaobin Zhu ,  Ganping Ju ,  Kai Chieh Chang ,  Yingguo Peng ,  Timothy J. Klemmer ,  Jan-Ulrich Thiele

IPC: G11B7/12 ,  G11B7/1267 ,  G11B5/024 ,  G11B5/00 ,  G11B27/36

CPC classification number: G11B7/1267 ,  G01R33/0325 ,  G11B5/024 ,  G11B5/4555 ,  G11B27/36 ,  G11B2005/0021

Abstract: An apparatus comprises a spindle to rotate a magnetic recording medium and a magnetic field generator to expose a track of the medium to a DC magnetic field. The magnetic field generator is configured to saturate the track during an erase mode and reverse the DC magnetic field impinging the track during a writing mode. A laser arrangement heats the track during the erase mode and, during the writing mode, heats the track while the track is exposed to the reversed DC magnetic field so as to write a magnetic pattern thereon. A reader reads the magnetic pattern and generates a read signal. A processor is coupled to the reader and configured to measure one or more magnetic properties of the track using the read signal. The apparatus can further comprise a Kerr sensor that generates a Kerr signal using the magnetic pattern.

Abstract translation: 一种装置包括用于旋转磁记录介质的主轴和磁场发生器，以将介质的轨道暴露于DC磁场。 磁场发生器被配置为在擦除模式期间使轨道饱和，并在写入模式期间逆转撞击轨道的直流磁场。 激光装置在擦除模式期间加热轨道，并且在写入模式期间，加热轨道，同时轨道暴露于反向的DC磁场，以便在其上写入磁性图案。 读取器读取磁性图案并产生读取信号。 处理器耦合到读取器并且被配置为使用读取信号来测量轨道的一个或多个磁性。 该装置还可以包括使用磁图案产生克尔信号的克尔传感器。