公开(公告)号：US20090142624A1

公开(公告)日：2009-06-04

申请号：US12325145

申请日：2008-11-29

Applicant: Hideaki TAKAHOSHI ,  Hisato Shibata ,  Shinya Sato ,  Isatake Kaitsu ,  Akira Kikuchi

Inventor： Hideaki TAKAHOSHI ,  Hisato Shibata ,  Shinya Sato ,  Isatake Kaitsu ,  Akira Kikuchi

IPC: G11B5/706 ,  C23C14/34

CPC classification number: G11B5/7325 ,  G11B5/65 ,  G11B5/66 ,  G11B5/851

Abstract: A method of producing a magnetic recording medium produces a medium having a magnetic recording layer disposed above a nonmagnetic intermediate layer, The nonmagnetic intermediate layer is formed by a sputtering using a target made of an oxide material. Oxygen gas or carbon dioxide gas is supplied during the sputtering in order to suppress a state where an oxygen supply becomes insufficient due to separation of oxygen atoms from the oxide material at a time of plasma generation.

Abstract translation: 制造磁记录介质的方法产生具有设置在非磁性中间层上方的磁记录层的介质。非磁性中间层通过使用由氧化物材料制成的靶进行溅射形成。 在溅射期间供给氧气或二氧化碳气体，以便抑制在等离子体产生时由于氧原子与氧化物材料的分离导致供氧不足的状态。

公开(公告)号：US20100007988A1

公开(公告)日：2010-01-14

申请号：US12497819

申请日：2009-07-06

Applicant: Satoshi Igarashi ,  Tohru Horie ,  Ryo Kurita ,  Isatake Kaitsu ,  Akira Kikuchi ,  Shinya Sato

Inventor： Satoshi Igarashi ,  Tohru Horie ,  Ryo Kurita ,  Isatake Kaitsu ,  Akira Kikuchi ,  Shinya Sato

IPC: G11B5/187 ,  G11B5/66

CPC classification number: G11B5/667 ,  G11B5/65 ,  G11B5/82

Abstract: A magnetic recording medium includes a nonmagnetic granular layer that has a granular structure in which a plurality of nonmagnetic grains made of a nonmagnetic material are separated from one another by a Cr oxide. The magnetic recording medium further includes a magnetic granular layer that is formed on the nonmagnetic granular layer and has a granular structure in which a plurality of magnetic grains made of a magnetic material are separated from one another by a nonmagnetic material.

Abstract translation: 磁记录介质包括具有颗粒结构的非磁性颗粒层，其中由非磁性材料制成的多个非磁性颗粒通过Cr氧化物彼此分离。 磁记录介质还包括磁性颗粒层，其形成在非磁性颗粒层上，并且具有颗粒结构，其中由磁性材料制成的多个磁性颗粒通过非磁性材料彼此分离。

公开(公告)号：US20080285177A1

公开(公告)日：2008-11-20

申请号：US12105965

申请日：2008-04-18

Applicant: Ryosaku Inamura ,  Isatake Kaitsu ,  Takuya Uzumaki ,  Iwao OKamoto ,  Akira Kikuchi

Inventor： Ryosaku Inamura ,  Isatake Kaitsu ,  Takuya Uzumaki ,  Iwao OKamoto ,  Akira Kikuchi

IPC: G11B5/33

CPC classification number: G11B5/667 ,  G11B5/65 ,  G11B5/66

Abstract: According to an aspect of an embodiment, a magnetic recording medium includes a substrate, and a first granular layer formed over the substrate, the first granular layer having a plurality of first magnetic particles and Si oxide separating the plurality of first magnetic particles. The magnetic recording medium further includes a second granular layer formed over the first granular layer, the second granular layer having a plurality of second magnetic particles and Ti oxide separating the plurality of second magnetic particles.

Abstract translation: 根据实施例的一个方面，磁记录介质包括基板和形成在基板上的第一颗粒层，第一颗粒层具有多个第一磁性颗粒和分离多个第一磁性颗粒的氧化硅。 磁记录介质还包括形成在第一颗粒层上的第二颗粒层，第二颗粒层具有多个第二磁性颗粒和分离多个第二磁性颗粒的Ti氧化物。

公开(公告)号：US20080075979A1

公开(公告)日：2008-03-27

申请号：US11900888

申请日：2007-09-13

Applicant: Ryosaku Inamura ,  Isatake Kaitsu

Inventor： Ryosaku Inamura ,  Isatake Kaitsu

IPC: G11B5/66 ,  B05D5/12

CPC classification number: G11B5/667 ,  G11B5/66 ,  G11B5/7379

Abstract: An under layer, a FeCoB seed layer, a crystalline orientation control layer having an fcc structure, a non-magnetic underlying layer, a first recording layer, a second recording layer, and a protective layer are formed on a substrate. The under layer includes three layers: a first soft magnetic layer, a non-magnetic spacer layer, and a second soft magnetic layer. The first recording layer has a granular structure in which magnetic particles are dispersed in a non-magnetic material, and the second recording layer has a non-granular structure.

Abstract translation: 在基板上形成底层，FeCoB种子层，具有fcc结构的结晶取向控制层，非磁性下层，第一记录层，第二记录层和保护层。 底层包括三层：第一软磁层，非磁性间隔层和第二软磁层。 第一记录层具有其中磁性颗粒分散在非磁性材料中的颗粒结构，并且第二记录层具有非颗粒结构。

公开(公告)号：US06713196B1

公开(公告)日：2004-03-30

申请号：US09723250

申请日：2000-11-27

Applicant: Isatake Kaitsu

Inventor： Isatake Kaitsu

IPC: G11B566

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

Abstract: The present invention provides a high-density, low-noise magnetic recording medium. This magnetic recording medium includes a substrate, a non-magnetic underlayer formed on the substrate, and a magnetic recording layer formed on the underlayer. The magnetic recording layer contains cobalt as the main component, 10 atm % to 18 atm % of chromium, 5 atm % to 20 atm % of platinum, and 10 atm % to 20 atm % of boron.

Abstract translation: 本发明提供一种高密度，低噪声的磁记录介质。 该磁记录介质包括基板，形成在基板上的非磁性底层和形成在底层上的磁记录层。 磁记录层含有钴作为主要成分，10atm％至18atm％的铬，5atm％至20atm％的铂，10atm％至20atm％的硼。

公开(公告)号：US20120019959A1

公开(公告)日：2012-01-26

申请号：US13257227

申请日：2010-03-02

Applicant: Ryo Kurita ,  Satoshi Igarashi ,  Isatake Kaitsu ,  Akira Kikuchi

Inventor： Ryo Kurita ,  Satoshi Igarashi ,  Isatake Kaitsu ,  Akira Kikuchi

IPC: G11B5/66 ,  G11B5/716 ,  G11B5/127

CPC classification number: G11B5/66 ,  G11B5/65

Abstract: A magnetic recording medium includes a non-magnetic granular layer, and a recording layer provided on the non-magnetic granular layer, wherein the recording layer includes a first granular magnetic layer provided on the non-magnetic granular layer, and a second granular magnetic layer provided on the first granular magnetic layer, and a non-magnetic material magnetically separating metal grains of the non-magnetic granular layer is different from a non-magnetic material magnetically separating magnetic grains of the first granular magnetic layer.

Abstract translation: 磁记录介质包括非磁性颗粒层和设置在非磁性颗粒层上的记录层，其中记录层包括设置在非磁性颗粒层上的第一粒状磁性层和第二粒状磁性层 设置在第一粒状磁性层上，并且非磁性粒状层的金属粒子的非磁性材料与磁性分离第一粒状磁性层的磁性粒子的非磁性材料不同。

公开(公告)号：US20080292909A1

公开(公告)日：2008-11-27

申请号：US12114431

申请日：2008-05-02

Applicant: Satoshi Igarashi ,  Akira Kikuchi ,  Isatake Kaitsu ,  Ryosaku Inamura ,  Kenji Sato ,  Shinya Sato ,  Hideaki Takahoshi ,  Atsushi Endo ,  Hisato Shibata

Inventor： Satoshi Igarashi ,  Akira Kikuchi ,  Isatake Kaitsu ,  Ryosaku Inamura ,  Kenji Sato ,  Shinya Sato ,  Hideaki Takahoshi ,  Atsushi Endo ,  Hisato Shibata

IPC: G11B5/706

CPC classification number: G11B5/65 ,  G11B5/66 ,  G11B5/667 ,  G11B5/7325

Abstract: This magnetic recording medium has a substrate, a nonmagnetic granular layer formed above the substrate and a recording layer formed on the nonmagnetic granular layer. The nonmagnetic granular layer is made of CoCr alloy with an hcp or an fcc crystal structure in which a nonmagnetic material segregates virtually-columnar magnetic grains. The magnetic recording medium and the magnetic storage apparatus in which the medium is used have improved reading/writing performances.

Abstract translation: 该磁记录介质具有基板，形成在基板上方的非磁性粒状层和形成在非磁性粒状层上的记录层。 非磁性粒状层由具有hcp或fcc晶体结构的CoCr合金制成，其中非磁性材料分离出实际上柱状的磁性颗粒。 使用介质的磁记录介质和磁存储装置具有改进的读/写性能。

公开(公告)号：US20080080093A1

公开(公告)日：2008-04-03

申请号：US11898959

申请日：2007-09-18

Applicant: Ryosaku Inamura ,  Isatake Kaitsu

Inventor： Ryosaku Inamura ,  Isatake Kaitsu

IPC: G11B5/127

CPC classification number: G11B5/82 ,  B82Y10/00 ,  G11B5/65 ,  G11B5/66 ,  G11B5/667 ,  G11B5/743 ,  G11B5/746 ,  G11B2005/0029

Abstract: A magnetic recording medium according to the present invention includes a nonmagnetic base material, a soft magnetic under layer, an interlayer, a recording layer and a protective layer, which are stacked over the base material. The soft magnetic under layer is formed of a lower soft magnetic layer, a magnetic domain control layer (or a nonmagnetic layer) and an upper soft magnetic layer. The lower and upper soft magnetic layers are each made of a material amorphized by adding at least one of zirconium (Zr) and tantalum (Ta) to an iron-cobalt (Fe—Co) alloy which is composed to form a body-centered cubic (bcc) structure.

Abstract translation: 根据本发明的磁记录介质包括层叠在基材上的非磁性基材，软磁下层，中间层，记录层和保护层。 软磁下层由下软磁层，磁畴控制层（或非磁性层）和上软磁层构成。 下层和上层软磁性层均由通过将锆（Zr）和钽（Ta）中的至少一种添加到铁 - 钴（Fe-Co）合金中的非晶化材料制成，所述铁 - 钴（Fe-Co）合金被构成以形成体心立方 （bcc）结构。

公开(公告)号：US20070217071A1

公开(公告)日：2007-09-20

申请号：US11476002

申请日：2006-06-28

Applicant: Ryosaku Inamura ,  Isatake Kaitsu

Inventor： Ryosaku Inamura ,  Isatake Kaitsu

IPC: G11B5/82

CPC classification number: G11B5/82 ,  G11B5/66 ,  G11B5/667

Abstract: According to the present invention, provided is a magnetic recording medium 11 comprising: a non-magnetism base member 1; a lower soft magnetic underlying layer 2 formed on the non-magnetism base member 1; a non-magnetic layer 4 formed on the lower soft magnetic underlying layer 2; an upper soft magnetic underlying layer 6 formed on the non-magnetic layer 4; and a recording layer 9 having a perpendicular magnetic anisotropy, the recording layer 9 being formed on the upper soft magnetic underlying layer 6, wherein crystalline magnetic layers 3 and 5 are formed between the lower soft magnetic underlying layer 2 and the non-magnetic layer 4 or between this non-magnetic layer 4 and the upper soft magnetic underlying layer 6.

Abstract translation: 根据本发明，提供一种磁记录介质11，包括：非磁性基体1; 形成在非磁性基体1上的下软磁下层2; 形成在下软磁下层2上的非磁性层4; 形成在非磁性层4上的上层软磁下层6; 和具有垂直磁各向异性的记录层9，记录层9形成在上软磁下层6上，其中结晶磁性层3和5形成在下软磁下层2和非磁性层4之间 或者在该非磁性层4和上部软磁性底层6之间。

公开(公告)号：US06562481B1

公开(公告)日：2003-05-13

申请号：US09454383

申请日：1999-12-03

Applicant: Isatake Kaitsu ,  Hisateru Sato ,  Iwao Okamoto

Inventor： Isatake Kaitsu ,  Hisateru Sato ,  Iwao Okamoto

IPC: G11B566

CPC classification number: G11B5/7325 ,  G11B5/64 ,  Y10S428/90 ,  Y10T428/12465 ,  Y10T428/12854

Abstract: A magnetic storage medium has a non-magnetic substrate and a recording layer. The recording layer comprises a non-magnetic matrix and crystal grains consisting of a ferromagnetic material. Each of the crystal grains dispersed in the recording layer is a columnar shaped grain which penetrates a suface of the recording layer and has height of 30 nm or less, and a mean value of grain sizes of the crystal grains in an internal direction of the recording layer is 15 nm or less. (Ku·V)/(kB·T) is not less than 60. A mean value Hk of anisotropic magnetic fields of the plurality of crystal grains is 20 kOe or less.

Abstract translation: 磁存储介质具有非磁性基板和记录层。 记录层包括非磁性矩阵和由铁磁材料组成的晶粒。 分散在记录层中的每个晶粒是穿过记录层的表面并具有30nm或更小的高度的圆柱形晶粒，以及记录内部方向上的晶粒的晶粒尺寸的平均值 层为15nm以下。 （KuV）/（kB.T）不小于60.多个晶粒的各向异性磁场的平均值H k为20kOe以下。