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    Perpendicular magnetic recording medium and magnetic recording/reproducing apparatus
    1.
    发明授权
    Perpendicular magnetic recording medium and magnetic recording/reproducing apparatus 失效
    垂直磁记录介质和磁记录/再现装置

    公开(公告)号：US07217467B2

    公开(公告)日：2007-05-15

    申请号：US10699737

    申请日：2003-11-04

    Applicant: Reiko Arai ,  Kiwamu Tanahashi ,  Atsushi Kikugawa

    Inventor： Reiko Arai ,  Kiwamu Tanahashi ,  Atsushi Kikugawa

    IPC: G11B5/667 ,  G11B5/673

    CPC classification number: G11B5/732 ,  G11B5/667 ,  G11B2005/0029

    Abstract: A magnetic recording/reproducing apparatus is disclosed with high storage capability. The apparatus also prevents fluctuation of readback output and decay of magnetization or erasure of recorded magnetization in the recording layer. A soft magnetic underlayer and a perpendicular recording layer are formed in specific order on the substrate of a magnetic disk. The soft magnetic underlayer has a triple-layered structure in which a domain control layer, including an anti-ferromagnetic layer, is sandwiched between two first and second soft magnetic layers. The thickness of the first and second soft magnetic layers (d1, d2) is between 25 nm and 150 nm and a ratio of d1/d2 is within a range of 0.3 to 1.5. Accordingly, magnetic domains in the soft magnetic underlayer of a perpendicular magnetic recording medium can be controlled and magnetic domain wall motion can be inhibited.

    Abstract translation: 公开了具有高存储能力的磁记录/重放装置。 该装置还防止记录层中的回读输出波动和磁化衰减或记录磁化的擦除。 在磁盘的基板上以特定顺序形成软磁性底层和垂直记录层。 软磁性底层具有三层结构，其中包括反铁磁层的域控制层夹在两个第一和第二软磁层之间。 第一和第二软磁性层（d 1，d 2）的厚度为25nm〜150nm，d 1 / d 2的比例为0.3〜1.5。 因此，可以控制垂直磁记录介质的软磁性底层中的磁畴，并且可以抑制磁畴壁运动。

    Perpendicular magnetic recording media, manufacturing process of the same, and magnetic storage apparatus using the same
    3.
    发明授权
    Perpendicular magnetic recording media, manufacturing process of the same, and magnetic storage apparatus using the same 失效
    垂直磁记录介质，制造工艺及其使用的磁存储装置

    公开(公告)号：US07041393B2

    公开(公告)日：2006-05-09

    申请号：US10357368

    申请日：2003-02-04

    Applicant: Kiwamu Tanahashi ,  Atsushi Kikugawa ,  Yoshio Takahashi ,  Yuzuru Hosoe

    Inventor： Kiwamu Tanahashi ,  Atsushi Kikugawa ,  Yoshio Takahashi ,  Yuzuru Hosoe

    IPC: G11B5/66 ,  G11B5/70

    CPC classification number: G11B5/667 ,  G11B5/66

    Abstract: A perpendicular recording medium includes a perpendicular recording layer formed over a substrate through a soft magnetic underlayer, the soft magnetic underlayer then being arranged to include a plurality of soft magnetic layers physically separated by a non-magnetic layer, and further, the soft magnetic layers being formed of nanocrystals, with these arrangements, local magnetic loops are formed between the soft magnetic layers that are adjacent to each other through the non-magnetic layer, thereby suppressing spike noise and modulation that arises from the soft magnetic underlayer.

    Abstract translation: 垂直记录介质包括通过软磁性底层在衬底上形成的垂直记录层，然后软磁性底层被布置成包括由非磁性层物理分离的多个软磁性层，此外，软磁性层 由纳米晶体形成，通过这些布置，通过非磁性层在彼此相邻的软磁性层之间形成局部磁环，从而抑制由软磁性底层产生的尖峰噪声和调制。

    Perpendicular magnetic recording media, manufacturing process of the same, and magnetic storage apparatus using the same
    5.
    发明授权
    Perpendicular magnetic recording media, manufacturing process of the same, and magnetic storage apparatus using the same 有权
    垂直磁记录介质，制造工艺及其使用的磁存储装置

    公开(公告)号：US06723457B2

    公开(公告)日：2004-04-20

    申请号：US10076655

    申请日：2002-02-19

    Applicant: Kiwamu Tanahashi ,  Atsushi Kikugawa ,  Noboru Shimizu ,  Yukio Honda ,  Yuzuru Hosoe

    Inventor： Kiwamu Tanahashi ,  Atsushi Kikugawa ,  Noboru Shimizu ,  Yukio Honda ,  Yuzuru Hosoe

    IPC: G11B566

    CPC classification number: G11B5/667 ,  G11B5/66 ,  G11B5/7325 ,  Y10S428/90

    Abstract: Provided are a double-layer perpendicular magnetic recording medium having a high medium S/N at an areal recording density of 50 Gbits or more per square inch, and a magnetic storage apparatus having excellent reliability with a low error rate. The perpendicular magnetic recording medium is formed by sequentially laminating a domain control layer, an amorphous soft magnetic underlayer, an intermediate layer, and a perpendicular recording layer on a substrate. The domain control layer is a triple-layer film formed by laminating a first polycrystalline soft magnetic layer, a disordered antiferromagnetic layer, and a second polycrystalline soft magnetic layer from a substrate side.

    Abstract translation: 提供了一种双层垂直磁记录介质，其具有每平方英寸50G比特或更高的面积记录密度的高介质S / N，以及具有低误码率的可靠性优异的磁存储装置。 垂直磁记录介质通过在基板上顺序地层叠域控制层，非晶软磁底层，中间层和垂直记录层而形成。 畴控制层是通过从基板侧层压第一多晶软磁层，无序反铁磁层和第二多晶软磁层而形成的三层膜。

    Perpendicular magnetic recording medium having FCC seed layers
    8.
    发明授权
    Perpendicular magnetic recording medium having FCC seed layers 有权
    具有FCC种子层的垂直磁记录介质

    公开(公告)号：US08390956B2

    公开(公告)日：2013-03-05

    申请号：US12793608

    申请日：2010-06-03

    Applicant: Shun Tonooka ,  Reiko Arai ,  Hiroyuki Nakagawa ,  Kiwamu Tanahashi

    Inventor： Shun Tonooka ,  Reiko Arai ,  Hiroyuki Nakagawa ,  Kiwamu Tanahashi

    IPC: G11B5/82 ,  G11B5/673 ,  B32B7/00

    CPC classification number: G11B5/732 ,  G11B5/667 ,  Y10T428/24975

    Abstract: According to one embodiment, a perpendicular magnetic recording medium includes at least one soft magnetic underlayer above a substrate, a seed layer above the at least one soft magnetic underlayer, an intermediate layer above the seed layer, a magnetic recording layer above the intermediate layer, and an overcoat layer above the magnetic recording layer, wherein the seed layer includes a second seed layer above a first seed layer. In another embodiment, the seed layer is a multilayered structure of at least two cycles of a unit of layered film which includes a first seed layer and a second seed layer. The first seed layer includes a non-magnetic alloy having a Face-Centered-Cubic (FCC) structure, and the second seed layer includes a soft magnetic alloy having a FCC structure. Other structures are also disclosed, according to more embodiments.

    Abstract translation: 根据一个实施例，垂直磁记录介质包括至少一个在基底上方的软磁性底层，至少一个软磁性底层上方的晶种层，种子层上方的中间层，中间层上方的磁记录层， 以及在所述磁记录层上方的覆盖层，其中所述种子层包括在第一种子层上方的第二种子层。 在另一个实施方案中，种子层是包括第一种子层和第二种子层的分层膜单元的至少两个循环的多层结构。 第一晶种层包括具有面心立方（FCC）结构的非磁性合金，第二晶种层包括具有FCC结构的软磁合金。 根据更多实施例，还公开了其他结构。

    Perpendicular magnetic recording media
    9.
    发明授权
    Perpendicular magnetic recording media 失效
    垂直磁记录介质

    公开(公告)号：US07316852B2

    公开(公告)日：2008-01-08

    申请号：US10936562

    申请日：2004-09-09

    Applicant: Kiwamu Tanahashi ,  Atsushi Kikugawa ,  Noboru Shimizu ,  Yukio Honda ,  Yuzuru Hosoe

    Inventor： Kiwamu Tanahashi ,  Atsushi Kikugawa ,  Noboru Shimizu ,  Yukio Honda ,  Yuzuru Hosoe

    IPC: G11B5/667

    CPC classification number: G11B5/66 ,  Y10T428/12465 ,  Y10T428/12861 ,  Y10T428/12875 ,  Y10T428/12986 ,  Y10T428/265

    Abstract: There is provided a perpendicular magnetic recording medium comprising a non-magnetic layer having a face-centered cubic structure, an antiferromagnetic layer provided on the non-magnetic layer, a soft magnetic underlayer provided on the antiferromagnetic layer, and a perpendicular recording layer provided on the soft magnetic underlayer, which magnetic recording medium makes it possible to realize a recording density not less than 50 Gb/in2 and makes the error rate thereof low while suppressing the spike noise.

    Abstract translation: 提供了一种垂直磁记录介质，其包括具有面心立方结构的非磁性层，设置在非磁性层上的反铁磁层，设置在反铁磁层上的软磁性底层和设置在反铁磁层上的垂直记录层 该软磁性底层，该磁记录介质使得可以实现不低于50Gb / in 2的记录密度，并且在抑制尖峰噪声的同时使其误码率较低。

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