公开(公告)号：US20100203358A1

公开(公告)日：2010-08-12

申请号：US11887539

申请日：2006-03-27

申请人： Teiichiro Umezawa ,  Yoshiaki Sonobe ,  Kong Kim

发明人： Teiichiro Umezawa ,  Yoshiaki Sonobe ,  Kong Kim

IPC分类号： G11B5/706

CPC分类号： G11B5/667

摘要： A perpendicular magnetic recording medium comprising a pair of soft magnetic layers that are laminated via a non-magnetic layer and antiparallel-coupled to each other and that are provided between a non-magnetic substrate and a magnetic recording layer, wherein spike noise and medium noise can be positively suppressed when information recording and reproduction are carried out at high recording surface density. At least one pair of soft magnetic layers are laid and formed via a non-magnetic layer on a substrate of a non-magnetic material so that magnetic characteristics obtained by integrating the pair of soft magnetic layers have a magnetic hysteresis to thereby prevent the formation of a magnetic domain wall.

摘要翻译： 一种垂直磁记录介质，包括通过非磁性层层叠并且反平行耦合并且设置在非磁性基板和磁记录层之间的一对软磁性层，其中尖峰噪声和介质噪声 当以高记录表面密度进行信息记录和再现时，可以被积极地抑制。 至少一对软磁性层通过非磁性材料的基板上的非磁性层铺设并形成，使得通过对该一对软磁性层的积分而获得的磁特性具有磁滞，从而防止形成 磁畴壁。

公开(公告)号：US20100119878A1

公开(公告)日：2010-05-13

申请号：US12594043

申请日：2008-03-28

申请人： Teiichiro Umezawa ,  Masafumi Ishiyama ,  Kenji Ayama ,  Tokichiro Sato

发明人： Teiichiro Umezawa ,  Masafumi Ishiyama ,  Kenji Ayama ,  Tokichiro Sato

IPC分类号： G11B5/706

CPC分类号： G11B5/7325 ,  G11B5/66

摘要： Provided is a magnetic recording medium which maintains high S/N ratio and coercive force (Hc) and has high recording density, even with fine magnetic particles, by further improving crystal orientation of a magnetic recording layer. The magnetic recording medium is provided with an orientation control layer (16), a nonmagnetic under layer (18), and a magnetic recording layer (22) on a substrate. The orientation control layer (16) has an fcc structure and a (111) plane parallel to the substrate. The under layer (18) has an hcp structure and a (0001) plane parallel to the substrate. An atomic distance of the (111) plane of the orientation control layer (16) is −0.2 Å to +0.15 Å to a lattice spacing of the under layer (18).

摘要翻译： 提供了通过进一步改善磁记录层的晶体取向，即使使用细小的磁性颗粒，仍然保持高S / N比和矫顽力（Hc）并且具有高记录密度的磁记录介质。 磁记录介质在基板上设置有取向控制层（16），非磁性底层（18）和磁记录层（22）。 取向控制层（16）具有fcc结构和平行于基板的（111）平面。 底层（18）具有hcp结构和平行于衬底的（0001）平面。 取向控制层（16）的（111）面的原子距离相对于下层（18）的晶格间距为-0.2到+0.15。

公开(公告)号：US20070053106A1

公开(公告)日：2007-03-08

申请号：US11485328

申请日：2006-07-13

申请人： Yoshiaki Sonobe ,  Shinichi Ishibashi ,  Masato Kobayashi ,  Teiichiro Umezawa

发明人： Yoshiaki Sonobe ,  Shinichi Ishibashi ,  Masato Kobayashi ,  Teiichiro Umezawa

IPC分类号： G11B5/74

CPC分类号： G11B5/667 ,  G11B5/8404

摘要： A perpendicular magnetic recording medium 10 adapted to be mounted in a perpendicular magnetic recording type hard disk drive and including a disk-shaped disk base 12, a soft magnetic layer 14 formed on the disk base 12, and a perpendicular magnetic recording layer 16 formed on the soft magnetic layer 14, wherein, at respective portions of the soft magnetic layer 14, directional distribution of easy magnetization axes of magnetic particles included In each of the respective portions is isotropic with respect to respective directions in the main surface of the soft magnetic layer 14.

摘要翻译： 适用于垂直磁记录型硬盘驱动器的垂直磁记录介质10，包括盘形盘基座12，形成在盘基座12上的软磁层14和垂直磁记录层16， 软磁性层14，其中，在软磁性层14的各个部分，包含的磁性粒子容易磁化轴的方向分布在各个部分中，相对于软磁性层主表面的各个方向各向同性 14。

公开(公告)号：US07081308B2

公开(公告)日：2006-07-25

申请号：US10858198

申请日：2004-06-02

申请人： Hisao Kawai ,  Teiichiro Umezawa ,  Hirotaka Tanaka ,  Masaki Uemura

发明人： Hisao Kawai ,  Teiichiro Umezawa ,  Hirotaka Tanaka ,  Masaki Uemura

IPC分类号： G11B5/66 ,  G11B5/70

CPC分类号： G11B5/66

摘要： In a magnetic recording medium including a substrate (1) having a principal surface on which first and second magnetic layers (5 and 7) and a spacer layer (6) are at least formed, each of the first and the second magnetic layers being of a ferromagnetic material, the spacer layer being formed between the first and the second magnetic layers for inducing antiferromagnetic exchange interaction between the first and the second magnetic layers, the principal surface of the substrate is provided with concentric textures to have a predetermined surface roughness so that the spacer layer has a uniform thickness. The first magnetic layer is for controlling the antiferromagnetic exchange interaction.

摘要翻译： 在包括具有至少形成第一和第二磁性层（5和7）和间隔层（6）的主表面的基底（1）的磁记录介质中，第一和第二磁性层中的每一个是 所述间隔层形成在所述第一和第二磁性层之间，用于在所述第一和第二磁性层之间引起反铁磁交换相互作用，所述基板的主表面设置有同心纹理以具有预定的表面粗糙度，使得 间隔层具有均匀的厚度。 第一磁性层用于控制反铁磁交换相互作用。

公开(公告)号：US20050208341A1

公开(公告)日：2005-09-22

申请号：US11123065

申请日：2005-05-06

申请人： Takashi Morikawa ,  Teiichiro Umezawa ,  Hiroshi Tomiyasu ,  Masafumi Ishiyama

发明人： Takashi Morikawa ,  Teiichiro Umezawa ,  Hiroshi Tomiyasu ,  Masafumi Ishiyama

IPC分类号： G11B5/72 ,  G11B5/64

CPC分类号： G11B5/72 ,  Y10T428/1179 ,  Y10T428/265 ,  Y10T428/30

摘要： In a magnetic recording medium which comprises a substrate (1), a magnetic layer (3) formed on the substrate, a carbon-based protection layer (4) comprising carbon and formed on the magnetic layer, and a lubrication layer (5) formed on the carbon-based protection layer, the carbon-based protection layer comprises a hydrogenated carbon protection layer (4a) facing the magnetic layer and a nitrogenated carbon protection layer (4b) facing the lubrication layer. The hydrogenated carbon protection layer (4a) comprises carbon and hydrogen. The nitrogenated carbon protection layer (4b) includes no hydrogen but comprises carbon and nitrogen.

公开(公告)号：US06759138B2

公开(公告)日：2004-07-06

申请号：US10186723

申请日：2002-07-02

申请人： Hiroshi Tomiyasu ,  Keiji Moroishi ,  Teiichiro Umezawa ,  Kenji Ayama

发明人： Hiroshi Tomiyasu ,  Keiji Moroishi ,  Teiichiro Umezawa ,  Kenji Ayama

IPC分类号： G11B566

CPC分类号： G11B5/7325 ,  G11B5/012 ,  G11B5/66 ,  G11B2005/0002 ,  G11B2005/001 ,  Y10T428/12646 ,  Y10T428/12847 ,  Y10T428/12854 ,  Y10T428/12861 ,  Y10T428/12868 ,  Y10T428/12931 ,  Y10T428/24355 ,  Y10T428/2495 ,  Y10T428/31

摘要： In a magnetic recording medium which includes a base body (1-4), first and second magnetic layers (5 and 7), each being of a ferromagnetic material, and a spacer layer (6) formed between the first and the second magnetic layers for inducing antiferromagnetic exchange interaction between the first and the second magnetic layers, the second magnetic layer located farther from the base body than the first magnetic layer includes a primary layer (72) and a secondary layer (71) located nearer to the base body than the primary layer. The primary layer has a primary anisotropic magnetic field while the secondary layer has a secondary anisotropic magnetic field which is smaller than the primary anisotropic magnetic field. The first magnetic layer is for controlling the antiferromagnetic exchange interaction.

摘要翻译： 在包括基体（1-4）的磁记录介质中，每个都是铁磁材料的第一和第二磁性层（5和7）以及形成在第一和第二磁性层之间的间隔层（6） 为了在第一和第二磁性层之间诱导反铁磁交换相互作用，位于比第一磁性层更远离基体的第二磁性层包括位于更靠近基体的主层（72）和次级层（71），比第 主层。 主层具有一次各向异性磁场，而次层具有小于一次各向异性磁场的次级各向异性磁场。 第一磁性层用于控制反铁磁交换相互作用。