公开(公告)号：US20050142388A1

公开(公告)日：2005-06-30

申请号：US10977552

申请日：2004-10-29

Applicant: Yoshiyuki Hirayama ,  Yuzuru Hosoe ,  Hiroyuki Nakagawa ,  Ikuko Takekuma

Inventor： Yoshiyuki Hirayama ,  Yuzuru Hosoe ,  Hiroyuki Nakagawa ,  Ikuko Takekuma

IPC: G11B5/738 ,  G11B5/64 ,  G11B5/65 ,  G11B5/667 ,  G11B5/673 ,  G11B5/73 ,  G11B5/68

CPC classification number: G11B5/7325 ,  G11B5/65 ,  G11B5/656

Abstract: Embodiments of the invention provide a perpendicular magnetic recording medium that not only attains the magnetic isolation of crystal grains in a magnetic recording layer from one another in a region of the medium in which the thickness of an intermediate layer is equal to or smaller than about 20 nm but also exhibits excellent crystallographic texture and that exhibits small medium noise, excellent thermal stability, and high write-ability. In one embodiment, a perpendicular magnetic recording medium has at least a soft-magnetic underlayer, a first intermediate layer, a second intermediate layer, a third intermediate layer, and a magnetic recording layer successively formed on a substrate. The magnetic recording layer is composed of ferromagnetic crystal grains and oxides or nitrides, the third intermediate layer is composed of Ru or an Ru alloy, the second intermediate layer is composed of a metal or an alloy having the face-centered cubic lattice structure, and the first intermediate layer is composed of a metal or an alloy having the hexagonal close-packed structure.

Abstract translation: 本发明的实施例提供了一种垂直磁记录介质，其不仅在中间层的厚度等于或小于约20的介质的区域中彼此之间实现磁记录层中的晶粒的磁隔离 nm，但也具有优异的晶体学结构，表现出中等的中等噪声，优异的热稳定性和高的写入能力。 在一个实施例中，垂直磁记录介质至少具有在基板上依次形成的软磁性底层，第一中间层，第二中间层，第三中间层和磁记录层。 磁记录层由铁磁性晶粒和氧化物或氮化物构成，第三中间层由Ru或Ru合金构成，第二中间层由具有面心立方晶格结构的金属或合金构成， 第一中间层由具有六方密堆积结构的金属或合金构成。

公开(公告)号：US06881496B2

公开(公告)日：2005-04-19

申请号：US10246980

申请日：2002-09-19

Applicant: Iwao Okamoto

Inventor： Iwao Okamoto

IPC: G11B5/64 ,  G11B5/66 ,  G11B5/673 ,  G11B5/738

CPC classification number: G11B5/66 ,  Y10T428/12861 ,  Y10T428/12986 ,  Y10T428/2495 ,  Y10T428/265

Abstract: A magnetic recording medium has first, second and third magnetic layers having magnetization directions which are alternately antiparallel in a state where no external magnetic field is applied on the magnetic recording medium, with a first nonmagnetic layer interposed between the first and second magnetic layers and a second nonmagnetic layer interposed between the second and third magnetic layers. A relationship Ms2×t2

Abstract translation: 磁记录介质具有第一，第二和第三磁性层，其磁化方向在不在外部磁场施加在磁记录介质上的状态下交替反平行，第一非磁性层介于第一和第二磁性层之间， 介于第二和第三磁性层之间的第二非磁性层。 其中Ms 1，Ms 2和Ms 3以及t 1，t 2和t 2的关系Ms 2 xt 2 <（Ms 1 xt 1 + Ms 3 xt 3）表示饱和磁化和第一， 和第三磁性层。

公开(公告)号：US06846576B1

公开(公告)日：2005-01-25

申请号：US10207087

申请日：2002-07-30

Applicant: Zhong Stella Wu ,  Samuel Dacke Harkness

Inventor： Zhong Stella Wu ,  Samuel Dacke Harkness

IPC: G11B5/64 ,  G11B5/65 ,  G11B5/66 ,  G11B5/673 ,  G11B5/73

CPC classification number: G11B5/7325 ,  G11B5/656 ,  G11B5/66 ,  Y10T428/12465 ,  Y10T428/12646 ,  Y10T428/12861 ,  Y10T428/12868 ,  Y10T428/12875 ,  Y10T428/12931 ,  Y10T428/12986 ,  Y10T428/24942 ,  Y10T428/265 ,  Y10T428/31

Abstract: Laminated magnetic recording medium with two Co-containing layers separated by a non-magnetic Ru-containing interlayer is stabilized by Ru-containing layer between the recording layers and Co-containing stabilization layers through anti-ferromagnetic coupling. The insertion of Co layer beneath Ru spacer has resulted in increased coupling, and further coupling enhancement is achieved by low pressure process of Co and Ru layers.

Abstract translation: 通过非磁性含Ru中间层分离的具有两个含Co层的层叠磁记录介质通过反铁磁耦合在记录层和含Co稳定层之间的含Ru层保持稳定。 Co层下面的Co层的插入导致耦合增加，并且通过Co和Ru层的低压工艺实现进一步的耦合增强。

公开(公告)号：US5763071A

公开(公告)日：1998-06-09

申请号：US614848

申请日：1996-03-11

Applicant: Ga-Lane Chen ,  Qixu Chen

Inventor： Ga-Lane Chen ,  Qixu Chen

IPC: G11B5/64 ,  G11B5/65 ,  G11B5/66 ,  G11B5/673 ,  G11B5/738

CPC classification number: G11B5/66 ,  Y10S428/90 ,  Y10T428/26 ,  Y10T428/265

Abstract: A magnetic recording medium having a high areal recording density of about 3 to about 20 Gb/in.sup.2, an Mrt of about 0.30 to about 0.60 memu/cm.sup.2, a coercivity greater than 2,500 Oersteds and a coercivity squareness of about 0.70 to about 0.95 is obtained by depositing one or more pairs of magnetic layers comprising a magnetically isotropic layer directly on a magnetically anisotropic layer. Chromium intermediate layers are employed to separate each pair of magnetically isotropic/anisotropic layers. In one embodiment, the magnetically anisotropic layer comprises a cobalt-base alloy containing chromium and tantalum and the magnetically isotropic layer comprises a cobalt-base layer containing chromium, platinum and tantalum.

Abstract translation: 具有约3至约20Gb / in2的高面密度记录密度，约0.30至约0.60emu / cm 2的Mrt，大于2500奥斯特的矫顽力和约0.70至约0.95的矫顽力矩形度的磁记录介质 通过将包含磁各向同性层的一对或多对磁层直接沉积在磁各向异性层上。 铬中间层用于分离每对磁各向同性/各向异性层。 在一个实施例中，磁各向异性层包括含有铬和钽的钴基合金，并且磁各向同性层包括含有铬，铂和钽的钴基层。

公开(公告)号：US08877360B2

公开(公告)日：2014-11-04

申请号：US13303479

申请日：2011-11-23

Applicant: Soichi Oikawa

Inventor： Soichi Oikawa

IPC: G11B5/673 ,  G11B5/73 ,  G11B5/65 ,  G11B5/66

CPC classification number: G11B5/65 ,  G11B5/66 ,  G11B5/7325

Abstract: According to one embodiment, a perpendicular magnetic recording medium includes a substrate, and a multilayered magnetic recording layer formed on the substrate by alternately stacking two or more magnetic layers and two or more nonmagnetic layers. The magnetic layers and nonmagnetic layers of the multilayered magnetic recording layer are continuous layers. The magnetic layer includes a magnetic material portion, and a plurality of pinning sites dispersed in the magnetic material portion and made of a nonmagnetic metal different from a nonmagnetic material as a main component of the nonmagnetic layer. This perpendicular magnetic recording medium has magnetic characteristics by which a gradient α of a magnetization curve near the coercive force is 5 or more.

Abstract translation: 根据一个实施例，垂直磁记录介质包括通过交替堆叠两个或更多个磁性层和两个或更多个非磁性层而形成在衬底上的衬底和多层磁记录层。 多层磁记录层的磁性层和非磁性层是连续层。 磁性层包括磁性材料部分和分散在磁性材料部分中并由不同于非磁性材料的非磁性材料制成的多个钉扎部位作为非磁性层的主要成分。 该垂直磁记录介质具有磁矫顽力附近的磁化曲线的梯度α为5以上的磁特性。

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。

公开(公告)号：US08101292B2

公开(公告)日：2012-01-24

申请号：US12771962

申请日：2010-04-30

Applicant: Erol Girt ,  Chung Yuang Shih ,  Miaogen Lu ,  Kueir-Weei Chour ,  Connie Chunling Liu ,  Mariana Rodica Munteanu ,  Jean Ling Lee

Inventor： Erol Girt ,  Chung Yuang Shih ,  Miaogen Lu ,  Kueir-Weei Chour ,  Connie Chunling Liu ,  Mariana Rodica Munteanu ,  Jean Ling Lee

IPC: G11B5/673

CPC classification number: G11B5/66 ,  G11B5/65

Abstract: A magnetic recording medium having a Au, Ag-containing magnetic layer having Co, Cr, Ag and Au; the magnetic recording layer having Co-containing magnetic grains surrounded by substantially nonmagnetic Cr-containing grain boundaries; wherein said Ag and said Au are substantially immiscible in the Co-containing magnetic grains is disclosed.

Abstract translation: 具有含有Co，Cr，Ag和Au的Au，含Ag的磁性层的磁记录介质; 所述磁记录层具有由基本上非磁性的含Cr晶界包围的含Co磁性颗粒; 其中所述Ag和所述Au在含Co磁性晶粒中基本上不混溶。

公开(公告)号：US07601443B2

公开(公告)日：2009-10-13

申请号：US11259085

申请日：2005-10-27

Applicant: Chee-kheng Lim ,  Yong-su Kim ,  Byung-kyu Lee ,  Hoon-sang Oh ,  Tae-hyo Lee

Inventor： Chee-kheng Lim ,  Yong-su Kim ,  Byung-kyu Lee ,  Hoon-sang Oh ,  Tae-hyo Lee

IPC: G11B5/66 ,  G11B5/667 ,  G11B5/673

CPC classification number: G11B5/66 ,  G11B5/653 ,  G11B5/656 ,  G11B5/667

Abstract: A recording medium including a perpendicular magnetic recording layer and a laminated SUL formed on a substrate is provided. The SUL includes an antiferromagnetic layer interposed between laminated structures including a magnetic layer, a non-magnetic layer and a magnetic layer. The layers may each have a thickness of 20 nm or less and the layers below the antiferromagnetic layer may be thinner than the layers on the antiferromagnetic layer. The laminated structures formed on and below the antiferromagnetic layer have unidirectional magnetic anisotropies set in the opposite radial direction to each other by an exchange bias. As a result, media magnetic domain noise can be diminished.

Abstract translation: 提供了包括在基板上形成的垂直磁记录层和层叠SUL的记录介质。 SUL包括介于包括磁性层，非磁性层和磁性层的层压结构之间的反铁磁性层。 这些层可以各自具有20nm或更小的厚度，并且反铁磁层下面​​的层可以比反铁磁性层上的层更薄。 形成在反铁磁性层上和下方的叠层结构具有通过交换偏压彼此相反的径向方向设置的单向磁各向异性。 结果，媒体磁畴噪声可以减弱。

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。

公开(公告)号：US20050196546A1

公开(公告)日：2005-09-08

申请号：US11052033

申请日：2005-02-08

Applicant: Tsutomu Aoyama ,  Shunji Ishio ,  Hirotaka Ito

Inventor： Tsutomu Aoyama ,  Shunji Ishio ,  Hirotaka Ito

IPC: G11B5/65 ,  C23C14/00 ,  G11B5/673 ,  G11B5/82 ,  G11B5/84 ,  H01F10/16 ,  H01F41/34

CPC classification number: G11B5/855 ,  B82Y10/00 ,  C23C14/48 ,  C23C14/5806 ,  C23C14/5833 ,  G11B5/82 ,  H01F10/123 ,  H01F10/3236 ,  H01F41/34

Abstract: At least one ion 6 selected from Cr, Al, Nb and Mo is locally implanted into a thin film 4 containing, as main components, at least one of Fe and Co and at least one of Pd and Pt and a boron ion 20 is then implanted into a whole surface of the thin film subjected to the implantation, and a heat treatment is thereafter carried out, and a portion 7 into which at least one ion 6 selected from Cr, Al, Nb and Mo and the boron ion 20 are implanted becomes a portion 9 having a small coercive force and a portion 8 into which only the boron ion 20 is implanted becomes a portion 10 having a large coercive force.

Abstract translation: 将选自Cr，Al，Nb和Mo中的至少一种离子6局部注入含有作为主要成分的至少一种Fe和Co以及Pd和Pt中至少一种和硼离子20中的至少一种的薄膜4 注入到经过植入的薄膜的整个表面上，然后进行热处理，并且其中注入至少一种选自Cr，Al，Nb和Mo的离子6和硼离子20的部分7 成为矫顽力小的部分9，仅注入硼离子20的部分8成为矫顽力大的部分10。