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    Magnetic recording medium and servo signal recording device
    43.
    发明授权
    Magnetic recording medium and servo signal recording device 有权

    公开(公告)号：US11862212B2

    公开(公告)日：2024-01-02

    申请号：US17599843

    申请日：2020-03-27

    Applicant: Sony Group Corporation

    Inventor： Junichi Tachibana ,  Noboru Sekiguchi

    IPC: G11B5/592 ,  G11B5/706 ,  G11B5/78

    CPC classification number: G11B5/5928 ,  G11B5/706 ,  G11B5/78

    Abstract: [Solving Means] A magnetic recording medium according to an embodiment of the present technology is a tape-shaped magnetic recording medium, including: a magnetic layer including a servo band, a servo signal being recorded on the servo band. An index expressed by Sq×Fact.(p−p)/F0(p−p) is 0.42 or more, Sq being a squareness ratio of the magnetic layer in a perpendicular direction, F0(p−p) being a peak-to-peak value of a first magnetic force gradient strength observed by a magnetic force microscope when a servo signal is saturation-recorded on the magnetic layer, Fact.(p−p) being a peak-to-peak value of a second magnetic force gradient strength for the servo signal recorded on the servo band observed by the magnetic force microscope.

    Soft magnetic underlayer having high temperature robustness for high areal density perpendicular recording media
    46.
    发明授权
    Soft magnetic underlayer having high temperature robustness for high areal density perpendicular recording media 有权
    软磁性底层对高密度垂直记录介质具有高温稳定性

    公开(公告)号：US09406328B2

    公开(公告)日：2016-08-02

    申请号：US14446193

    申请日：2014-07-29

    Applicant: HGST Netherlands B.V.

    Inventor： Shun Tonooka ,  Masayoshi Shimizu ,  Hiroyuki Nakagawa ,  Kiwamu Tanahashi

    IPC: G11B5/706 ,  G11B5/667 ,  G11B5/716 ,  G11B5/65 ,  G11B5/66

    CPC classification number: G11B5/667 ,  G11B5/65 ,  G11B5/66 ,  G11B5/706 ,  G11B5/70605 ,  G11B5/716

    Abstract: In one embodiment, a perpendicular magnetic recording medium includes: a substrate; and a soft magnetic underlayer structure positioned above the substrate, where the soft magnetic underlayer includes: a coupling layer; a first soft underlayer positioned above the coupling layer; and a second soft underlayer positioned below the coupling layer, where a difference between a magnetic flux density of the soft magnetic underlayer structure at 25° C. and a magnetic flux density of the soft underlayer structure at 85° C. is less than or equal to about 10% of the magnetic flux density of the soft magnetic underlayer structure at 25° C.

    Abstract translation: 在一个实施例中，垂直磁记录介质包括：基板; 以及位于所述衬底上方的软磁性底层结构，其中所述软磁性底层包括：耦合层; 位于所述耦合层上方的第一软底层; 以及位于耦合层下方的第二软底层，其中软磁底层结构在25℃的磁通密度与软底层结构在85℃下的磁通密度之间的差小于或等于 到软磁底层结构在25℃下的磁通密度的约10％

    MAGNETIC EXCHANGE COUPLED CORE-SHELL NANOMAGNETS
    47.
    发明申请
    MAGNETIC EXCHANGE COUPLED CORE-SHELL NANOMAGNETS 审中-公开
    磁性交换耦合核心纳米级网络

    公开(公告)号：US20150287506A1

    公开(公告)日：2015-10-08

    申请号：US14741217

    申请日：2015-06-16

    Applicant: Yang-Ki Hong ,  Seok Bae

    Inventor： Yang-Ki Hong ,  Seok Bae

    IPC: H01F1/03

    CPC classification number: H01F1/0302 ,  G11B5/706 ,  H01F1/0054 ,  H01F1/061 ,  H01F3/00

    Abstract: A permanent magnet is fabricated such that it has a magnetically hard core surrounded by a thin magnetically soft shell. The magnetically hard core provides a relatively high intrinsic coercivity (Hci), and the magnetically soft shell provides a relatively high magnetic flux density (B). Due to magnetic exchange coupling between the core and shell, a relatively high maximum energy product (BH)max is achievable over a wide temperature range, including temperatures above 150° C. Further, such effects can be achieved without using rare-earth metals or precious metals helping to keep the manufacturing costs of the magnet low. To allow sufficient exchange magnetic coupling between the core and shell, the width of the shell is less than about 40 nanometers, and the overall dimensions are controlled such that the width of the shell is less than two times the Bloch domain wall thickness of the core.

    Abstract translation: 制造永磁体，使得其具有被薄磁软壳包围的磁性硬芯。 磁性硬磁芯提供相对较高的固有矫顽力（Hci），并且磁软壳提供相对较高的磁通密度（B）。 由于芯和壳之间的磁交换耦合，在宽温度范围内（包括高于150℃的温度）可实现相对较高的最大能量积（BH）max。此外，可以在不使用稀土金属或 贵金属有助于保持低磁铁的制造成本。 为了允许芯和壳之间的充分的交换磁耦合，壳的宽度小于约40纳米，并且整体尺寸被控制，使得壳的宽度小于芯的Bloch畴壁厚度的两倍 。

    MAGNETIC EXCHANGE COUPLED CORE-SHELL NANOMAGNETS
    49.
    发明申请
    MAGNETIC EXCHANGE COUPLED CORE-SHELL NANOMAGNETS 有权

    公开(公告)号：US20130342297A1

    公开(公告)日：2013-12-26

    申请号：US13885371

    申请日：2011-11-15

    Applicant: Yang-Ki Hong ,  Seok Bae

    Inventor： Yang-Ki Hong ,  Seok Bae

    IPC: H01F3/00

    CPC classification number: H01F1/0302 ,  G11B5/706 ,  H01F1/0054 ,  H01F1/061 ,  H01F3/00

    Abstract: A permanent magnet is fabricated such that it has a magnetically hard core surrounded by a thin magnetically soft shell. The magnetically hard core provides a relatively high intrinsic coercivity (Hci), and the magnetically soft shell provides a relatively high magnetic flux density (B). Due to magnetic exchange coupling between the core and shell, a relatively high maximum energy product (BH)max is achievable over a wide temperature range, including temperatures above 150° C. Further, such effects can be achieved without using rare-earth metals or precious metals helping to keep the manufacturing costs of the magnet low. To allow sufficient exchange magnetic coupling between the core and shell, the width of the shell is less than about 40 nanometers, and the overall dimensions are controlled such that the width of the shell is less than two times the Bloch domain wall thickness of the core.

    MAGNETIC STORAGE MEDIUM FORMED OF CARBON NANOTUBE ARRAYS
    50.
    发明申请
    MAGNETIC STORAGE MEDIUM FORMED OF CARBON NANOTUBE ARRAYS 有权

    公开(公告)号：US20100285336A1

    公开(公告)日：2010-11-11

    申请号：US12700739

    申请日：2010-02-05

    Applicant: Tyson York Winarski

    Inventor： Tyson York Winarski

    IPC: H01F1/26 ,  G11B5/66 ,  G11B5/65

    CPC classification number: G11B5/65 ,  B82Y10/00 ,  G11B5/54 ,  G11B5/706 ,  Y10S977/742 ,  Y10S977/773

    Abstract: A magnetic storage medium is formed of magnetic nanoparticles that are encapsulated within carbon nanotubes, which are arranged in a substrate to facilitate the reading and writing of information by a read/write head. The substrate may be flexible or rigid. Information is stored on the magnetic nanoparticles via the read/write head of a storage device. These magnetic nanoparticles are arranged into data tracks to store information through encapsulation within the carbon nanotubes. As carbon nanotubes are bendable, the carbon nanotubes may be arranged on flexible or rigid substrates, such as a polymer tape or disk for flexible media, or a glass substrate for rigid disk. A polymer may assist holding the nano-particle filled carbon-tubes to the substrate.

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