公开(公告)号：US20120300600A1

公开(公告)日：2012-11-29

申请号：US13574932

申请日：2011-01-24

Applicant: Tetsuya Kanbe ,  Atsushi Hashimoto ,  Takayuki Fukushima

Inventor： Tetsuya Kanbe ,  Atsushi Hashimoto ,  Takayuki Fukushima

IPC: G11B13/04 ,  G11B5/66

CPC classification number: G11B5/66 ,  G11B5/314 ,  G11B5/6088 ,  G11B5/65 ,  G11B5/82 ,  G11B2005/0021

Abstract: A thermally assisted magnetic recording medium having a structure in which a first magnetic layer 106 and a second magnetic layer 107 are formed on a substrate 101 in this order, wherein the first magnetic layer 106 has a granular structure containing a FePt alloy having a L10 structure, a CoPt alloy having a L10 crystal lattice structure or a CoPt alloy having a L11 crystal lattice structure, and at least one material for causing grain boundary segregation selected from the group consisting of SiO2, TiO2, Cr2O3, Al2O3, Ta2O5, ZrO2, Y2O3, CeO2, MnO, TiO, ZnO, and MgO, and the content of the material for causing grain boundary segregation in the first magnetic layer 106 is decreased from the substrate side to the second magnetic layer 107 side.

Abstract translation: 具有这样的结构的热辅助磁记录介质，其中第一磁性层106和第二磁性层107依次形成在基板101上，其中第一磁性层106具有包含具有L10结构的FePt合金的颗粒结构 具有L10晶格结构的CoPt合金或具有L11晶格结构的CoPt合金，以及选自SiO 2，TiO 2，Cr 2 O 3，Al 2 O 3，Ta 2 O 5，ZrO 2，Y 2 O 3中的至少一种用于引起晶界偏析的材料 CeO 2，MnO，TiO，ZnO和MgO，第一磁性层106中的晶界偏析材料的含量从基板侧减少到第二磁性层107侧。

公开(公告)号：US20120207003A1

公开(公告)日：2012-08-16

申请号：US13396234

申请日：2012-02-14

Applicant: Tetsuya Kanbe ,  Kazuya Niwa ,  Katsuya Hara

Inventor： Tetsuya Kanbe ,  Kazuya Niwa ,  Katsuya Hara

IPC: G11B11/00 ,  G11B5/66

CPC classification number: G11B5/7325 ,  G11B5/65 ,  G11B2005/0021

Abstract: A heat-assisted magnetic recording medium includes a substrate, a plurality of foundation layers, and a magnetic layer. The plurality of foundation layers are provided on the substrate and include a first layer containing MnO. The magnetic layer is provided on the plurality of layers and includes an alloy as a main ingredient. The alloy has an L10 structure.

Abstract translation: 热辅助磁记录介质包括基板，多个基础层和磁性层。 多个基础层设置在基底上并且包括含有MnO的第一层。 磁性层设置在多个层上，并且包括合金作为主要成分。 该合金具有L10结构。

公开(公告)号：US20120113768A1

公开(公告)日：2012-05-10

申请号：US13384933

申请日：2010-08-19

Applicant: Tetsuya Kanbe ,  Yuzo Sasaki ,  Atsushi Hashimoto

Inventor： Tetsuya Kanbe ,  Yuzo Sasaki ,  Atsushi Hashimoto

IPC: G11B5/66 ,  G11B13/04

CPC classification number: G11B5/7325 ,  G11B5/6088 ,  G11B5/656 ,  G11B5/82 ,  G11B2005/0021

Abstract: A heat-assisted magnetic recording medium that includes a substrate 1, underlayers formed on the substrate 1, and a magnetic layer 5 which is formed on the underlayers and contains either an FePt alloy having an L10 structure or a CoPt alloy having an L10 structure as a main component, wherein the underlayers include a first underlayer 2 formed from an amorphous alloy, a second underlayer 3 formed from an alloy having a BCC structure containing Cr as a main component and also containing at least one element selected from among Ti, Mo, W, V, Mn and Ru, and a third underlayer 4 formed from MgO. Also, a magnetic storage device that uses the heat-assisted magnetic recording medium.

Abstract translation: 一种热辅助磁记录介质，其包括基板1，形成在基板1上的底层和形成在底层上的磁性层5，并且包含具有L10结构的FePt合金或具有L10结构的CoPt合金作为 主要成分，其中底层包括由非晶合金形成的第一底层2，由具有包含Cr作为主要成分的BCC结构的合金形成的第二底层3，并且还含有选自Ti，Mo， W，V，Mn和Ru，以及由MgO形成的第三底层4。 而且，使用该热辅助磁记录介质的磁存储装置。

公开(公告)号：US20110235479A1

公开(公告)日：2011-09-29

申请号：US13073408

申请日：2011-03-28

Applicant: Tetsuya KANBE ,  Atsushi HASHIMOTO ,  Takayuki FUKUSHIMA

Inventor： Tetsuya KANBE ,  Atsushi HASHIMOTO ,  Takayuki FUKUSHIMA

IPC: G11B13/04 ,  G11B5/73

CPC classification number: G11B5/7325 ,  G11B5/65

Abstract: Disclosed is a thermally assisted magnetic recording medium comprising a substrate, a plurality of underlayers formed on the substrate, and a magnetic layer which is formed on the underlayers and predominantly comprised of an alloy having an L10 structure, characterized in that at least one of said underlayers is predominantly comprised of MgO and comprises at least one kind of an element having a free energy for oxidation of, per mol of oxygen, not higher than −120 kcal/mol·O2 at 1000° C. The element having the free energy for oxidation is preferably selected from Al, Si, Ti, V, Cr, Mn, Zr and B . The thermally assisted magnetic recording medium has a magnetic layer comprised of magnetic crystal grains with uniform diameters, and exhibiting a sufficiently weak exchange coupling between magnetic grains.

Abstract translation: 公开了一种热辅助磁记录介质，其包括基板，形成在基板上的多个底层，以及形成在底层上并主要由具有L10结构的合金组成的磁性层，其特征在于，所述至少一个所述 底层主要由MgO组成，并且包含至少一种元素，其具有在1000℃下每摩尔氧气不超过-120千卡/摩尔·O 2的自由能。元素具有自由能 氧化优选选自Al，Si，Ti，V，Cr，Mn，Zr和B。 热辅助磁记录介质具有由具有均匀直径的磁晶粒构成的磁性层，并且在磁性颗粒之间呈现足够弱的交换耦合。

公开(公告)号：US07273667B2

公开(公告)日：2007-09-25

申请号：US10856094

申请日：2004-05-28

Applicant: Tatsuya Hinoue ,  Tetsuya Kanbe ,  Hiroyuki Suzuki ,  Tomoo Yamamoto

Inventor： Tatsuya Hinoue ,  Tetsuya Kanbe ,  Hiroyuki Suzuki ,  Tomoo Yamamoto

IPC: G11B5/716

CPC classification number: G11B5/7325 ,  G11B5/656 ,  G11B5/66 ,  Y10T428/12931 ,  Y10T428/265

Abstract: A magnetic recording medium capable of attaining high in-plane recording density of 100 Mbits or more per 1 mm2 is provided. Magnetic recording medium is provided in which underlayers, a first magnetic layer, a first intermediate layer, a second magnetic layer, a second intermediate layer, a third magnetic layer, a protection layer and lubrication layer are formed in this order above a substrate. Each of the third magnetic layer and the second magnetic layer comprises a Co-based alloy containing at least Pt, Cr and B. The concentration of Pt contained in the second magnetic layer is not more than that in the third magnetic layer.

Abstract translation: 提供能够获得每1mm 2的100Mb以上的高平面内记录密度的磁记录介质。 提供磁性记录介质，其中在衬底上方依次形成底层，第一磁性层，第一中间层，第二磁性层，第二中间层，第三磁性层，保护层和润滑层。 第三磁性层和第二磁性层中的每一个包含至少含有Pt，Cr和B的Co基合金。第二磁性层中所含的Pt的浓度不大于第三磁性层中的浓度。

公开(公告)号：US07261958B2

公开(公告)日：2007-08-28

申请号：US10067333

申请日：2002-02-07

Applicant: Yoshiyuki Hirayama ,  Hiroyuki Suzuki ,  Hiroyuki Kataoka ,  Yotsuo Yahisa ,  Tetsuya Kanbe

Inventor： Yoshiyuki Hirayama ,  Hiroyuki Suzuki ,  Hiroyuki Kataoka ,  Yotsuo Yahisa ,  Tetsuya Kanbe

IPC: G11B5/66 ,  G11B5/70

CPC classification number: G11B5/66 ,  G11B5/00 ,  G11B5/012 ,  G11B2005/0002 ,  G11B2005/0016

Abstract: A magnetic recording medium having at least two magnetic layers and a non-magnetic intermediate layer held between them. The first magnetic layer (which is closer to the substrate than the non-magnetic intermediate layer) is formed from an alloy composed of Co, Pr, and Cr, with Pt content being 3-9 at %. The second magnetic layer (which is farther from the substrate than the non-magnetic intermediate layer) is formed from a Co-based alloy containing Pt, Cr, and B. The first and second magnetic layers are magnetized in the mutually antiparallel direction in the absence of an applied magnetic field.The magnetic recording medium is characterized by good thermal stability for recording bits, high recording resolution, and low media noise. It is suitable for a magnetic storage for high recording density with high reliability.

Abstract translation: 具有至少两个磁性层和保持在它们之间的非磁性中间层的磁记录介质。 第一磁性层（其比非磁性中间层更靠近基板）由Co，Pr和Cr组成的合金形成，Pt含量为3-9原子％。 第二磁性层（其比非磁性中间层离基板更远）由含有Pt，Cr和B的Co基合金形成。第一和第二磁性层在相互反平行的方向上被磁化 不存在施加的磁场。 磁记录介质的特征在于用于记录位的良好热稳定性，高记录分辨率和低介质噪声。 适用于具有高可靠性的高记录密度的磁存储。

公开(公告)号：US07005202B2

公开(公告)日：2006-02-28

申请号：US10631768

申请日：2003-08-01

Applicant: Tetsuya Kanbe ,  Yotsuo Yahisa ,  Yoshibumi Matsuda ,  Jo Inagaki ,  Koji Sakamoto

Inventor： Tetsuya Kanbe ,  Yotsuo Yahisa ,  Yoshibumi Matsuda ,  Jo Inagaki ,  Koji Sakamoto

IPC: G11B5/66 ,  G11B5/70

CPC classification number: G11B5/7325 ,  G11B5/00 ,  G11B5/656 ,  Y10S428/90 ,  Y10T428/12465 ,  Y10T428/12854 ,  Y10T428/12944

Abstract: The longitudinal magnetic recording medium includes a non-magnetic substrate, a first underlayer having at least one of an amorphous structure and a fine crystal structure formed on the non-magnetic substrate, a second underlayer having a body-centered cubic structure formed on the first underlayer, a third underlayer having a hexagonal closed packed structure formed on the second underlayer, and a magnetic layer having the hexagonal closed packed structure formed on the third underlayer, wherein the third underlayer is composed of an alloy containing Co and Ru.

公开(公告)号：US06692843B2

公开(公告)日：2004-02-17

申请号：US09784078

申请日：2001-02-16

Applicant: Yoshibumi Matsuda ,  Akira Ishikawa ,  Yotsuo Yahisa ,  Yuzuru Hosoe ,  Tetsuya Kanbe ,  Koji Sakamoto

Inventor： Yoshibumi Matsuda ,  Akira Ishikawa ,  Yotsuo Yahisa ,  Yuzuru Hosoe ,  Tetsuya Kanbe ,  Koji Sakamoto

IPC: G11B573

CPC classification number: G11B5/7325 ,  G11B5/8404 ,  Y10T428/1266 ,  Y10T428/12667

Abstract: A magnetic recording medium having first undercoating layers 40, 40′ formed directly or via substrate face undercoating layers on a substrate 40, second undercoating layers 42, 42′ directly formed on the first undercoating layers 40, 40′, magnetic films 43, 43′ formed on the second undercoating layers 42, 42′, and protective films 44, 44′ formed on the magnetic films 43, 43′. Clusters having a large amount of oxygen are dispersed on the boundary face of the first and second undercoating layers. Preferably, the first undercoating layer is made of an alloy which includes two kinds of elements in which the difference between oxide formation standard free energies &Dgr;G° of the elements at the temperature of 250° C. is large.

Abstract translation: 一种磁记录介质，其具有直接形成在衬底40上的衬底表面底涂层形成的第一底涂层40,40'，直接形成在第一底涂层40,40'上的第二底涂层42,42'，磁性膜43,43' 形成在第二底涂层42,42'上，以及形成在磁性膜43,43'上的保护膜44,44'。 具有大量氧的簇分散在第一和第二底涂层的边界面上。 优选地，第一底涂层由包含两种元素的合金制成，其中在250℃的温度下元素的氧化物形成标准自由能的差ΔG°大。

公开(公告)号：US06623874B2

公开(公告)日：2003-09-23

申请号：US09888523

申请日：2001-06-26

Applicant: Tetsuya Kanbe ,  Yotsuo Yahisa ,  Yoshibumi Matsuda ,  Jo Inagaki ,  Koji Sakamoto

Inventor： Tetsuya Kanbe ,  Yotsuo Yahisa ,  Yoshibumi Matsuda ,  Jo Inagaki ,  Koji Sakamoto

IPC: G11B566

CPC classification number: G11B5/7325 ,  G11B5/00 ,  G11B5/656 ,  Y10S428/90 ,  Y10T428/12465 ,  Y10T428/12854 ,  Y10T428/12944

Abstract: The longitudinal magnetic recording medium includes a non-magnetic substrate, a first underlayer having at least one of an amorphous structure and a fine crystal structure formed on the non-magnetic substrate, a second underlayer having a body-centered cubic structure formed on the first underlayer, a third underlayer having a hexagonal closed packed structure formed on the second underlayer, and a magnetic layer having the hexagonal closed packed structure formed on the third underlayer, wherein the third underlayer is composed of an alloy containing Co and Ru.

公开(公告)号：US06511761B1

公开(公告)日：2003-01-28

申请号：US09663204

申请日：2000-09-18

Applicant: Kiwamu Tanahashi ,  Tetsuya Kanbe ,  Satoshi Matsunuma ,  Akira Ishikawa

Inventor： Kiwamu Tanahashi ,  Tetsuya Kanbe ,  Satoshi Matsunuma ,  Akira Ishikawa

IPC: H01F101

CPC classification number: G11B5/732 ,  C22C27/06 ,  C22C45/04 ,  G11B5/012 ,  G11B5/7325 ,  Y10S428/90 ,  Y10T428/12465 ,  Y10T428/12854

Abstract: In a magnetic storage apparatus including a recording medium having a magnetic layer, a seed layer and an underlayer formed on a substrate, a driver for driving the recording medium, a magnetic head having an inductive recording head and a magnetoresistive reproducing head, and a signal processing system for processing input signals to the magnetic head and output signals from the magnetic head, the seed layer comprises an amorphous alloy or a microcrystal alloy containing Ni, Ta and Zr, the underlayer comprises an alloy containing Cr as a main component and Ti, and the magnetic layer has a first magnetic layer in contact with the underlayer and a second magnetic layer on the first magnetic layer. The first magnetic layer comprises a Co—Cr—Pt alloy and the second magnetic layer comprises Co—Cr—Pt—B alloy, both of a substantially hexagonal close-packed structure.

Abstract translation: 在包括具有磁性层的记录介质，形成在基板上的种子层和底层的记录介质的磁存储装置中，用于驱动记录介质的驱动器，具有感应记录头和磁阻再现头的磁头以及信号 处理系统，用于处理输入信号到磁头并输出来自磁头的信号，种子层包括非晶合金或含有Ni，Ta和Zr的微晶合金，底层包含以Cr为主要成分的合金和Ti， 并且所述磁性层具有与所述底层接触的第一磁性层和所述第一磁性层上的第二磁性层。 第一磁性层包括Co-Cr-Pt合金，第二磁性层包括Co-Cr-Pt-B合金，均为基本上六方密堆积结构。