公开(公告)号：US20070148499A1

公开(公告)日：2007-06-28

申请号：US10576755

申请日：2005-06-29

申请人： Yoshiaki Sonobe ,  Teiichiro Umezawa ,  Chikara Takasu

发明人： Yoshiaki Sonobe ,  Teiichiro Umezawa ,  Chikara Takasu

IPC分类号： G11B5/66 ,  C23C14/00

CPC分类号： H01F10/007 ,  B82Y25/00 ,  G11B5/66 ,  G11B5/851 ,  G11B2005/0029 ,  H01F10/16 ,  H01F41/18

摘要： A magnetic disk 10 for use in perpendicular magnetic recording has at least a magnetic recording layer on a substrate 1. The magnetic recording layer is composed of a ferromagnetic layer 5 of a granular structure containing silicon (Si) or an oxide of silicon (Si) between crystal grains containing cobalt (Co), a stacked layer 7 having a first layer containing cobalt (Co) or a Co alloy and a second layer containing palladium (Pd) or platinum (Pt), and a spacer layer 6 interposed between the ferromagnetic layer 5 and the stacked layer 7. After forming the ferromagnetic layer 5 on the substrate 1 by sputtering in an argon gas atmosphere, the stacked layer 7 is formed by sputtering in the argon gas atmosphere at a gas pressure lower than that used when forming the ferromagnetic layer 5.

摘要翻译： 用于垂直磁记录的磁盘10在基板1上至少具有磁记录层。 磁记录层由包含钴（Co）的晶粒之间的含硅（Si）或硅（Si）的颗粒结构的铁磁层5构成，堆叠层7具有包含钴（Co）的第一层， 或Co合金和含有钯（Pd）或铂（Pt）的第二层，以及介于铁磁层5和堆叠层7之间的间隔层6。 在氩气气氛中通过溅射在基板1上形成铁磁层5之后，通过在氩气气氛中以低于形成铁磁层5时使用的气体压力的溅射形成堆叠层7。

公开(公告)号：US07220500B1

公开(公告)日：2007-05-22

申请号：US09540646

申请日：2000-03-31

申请人： Hiroshi Tomiyasu ,  Teiichiro Umezawa ,  Genshichi Hata ,  Takashi Morikawa ,  Masato Kobayashi ,  Masashi Suzuki ,  Satoshi Yokota ,  Tsuyoshi Watanabe

发明人： Hiroshi Tomiyasu ,  Teiichiro Umezawa ,  Genshichi Hata ,  Takashi Morikawa ,  Masato Kobayashi ,  Masashi Suzuki ,  Satoshi Yokota ,  Tsuyoshi Watanabe

IPC分类号： G11B5/66 ,  G11B5/70

CPC分类号： G11B5/732 ,  G11B5/40 ,  G11B5/455 ,  G11B5/66 ,  G11B5/7325

摘要： There is disclosed a magnetic recording medium in which a seed layer, under layer, intermediate layer, first magnetic layer, nonmagnetic layer, second magnetic layer, protective layer, and lubricant layer are successively laminated on a glass substrate, the nonmagnetic layer is constituted of an alloy containing Cr and C, and the magnetic layer is constituted of an alloy containing Co and Pt. The under layer includes at least the seed layer for finely dividing the crystal particles of the magnetic layer, the seed layer includes at least two or more layers of nonmagnetic films, and the intermediate layer formed of the material different from that of the nonmagnetic film is interposed between the nonmagnetic films. In measurement of the thermal stability of the magnetic recording medium, a head is used, the head includes a read/write element, and a write track width is twice or more as large as a read track width in the head.

公开(公告)号：US09240204B2

公开(公告)日：2016-01-19

申请号：US13112323

申请日：2011-05-20

申请人： Teiichiro Umezawa ,  Takenori Kajiwara ,  Tokichiro Sato

发明人： Teiichiro Umezawa ,  Takenori Kajiwara ,  Tokichiro Sato

IPC分类号： G11B5/66 ,  C23C16/26

CPC分类号： G11B5/66 ,  C23C16/26

摘要： A perpendicular magnetic disk is provided. The disk includes, on a base and in the order from bottom, a first granular magnetic layer group including a plurality of magnetic layers each having a granular structure, a non-magnetic layer having Ru or a Ru alloy as a main component, a second granular magnetic layer group including a plurality of magnetic layers each having the granular structure, and an auxiliary recording layer having a CoCrPtRu alloy as a main component. Layers closer to a front surface among the plurality of magnetic layers included in the first granular magnetic layer group having an equal or smaller content of Pt. Layers closer to the front surface among the plurality of magnetic layers included in the second granular magnetic layer group having an equal or smaller content of Pt and having an equal or larger content of an oxide.

摘要翻译： 提供垂直磁盘。 该盘在基部上并且从底部开始依次包括具有粒状结构的多个磁性层的第一粒状磁性层组，具有Ru或Ru合金作为主要成分的非磁性层，第二 包括具有颗粒结构的多个磁性层的粒状磁性层组以及以CoCrPtRu合金为主要成分的辅助记录层。 更靠近Pt含量相同或更小的第一粒状磁性层组中包含的多个磁性层中的前表面。 在具有等于或更小含量的Pt并且具有相等或更大含量的氧化物的第二粒状磁性层组中包含的多个磁性层中更靠近前表面的层。

公开(公告)号：US07420886B2

公开(公告)日：2008-09-02

申请号：US11788426

申请日：2007-04-20

申请人： Hiroshi Tomiyasu ,  Teiichiro Umezawa ,  Genshichi Hata ,  Takashi Morikawa ,  Masato Kobayashi ,  Masashi Suzuki ,  Satoshi Yokota ,  Tsuyoshi Watanabe

发明人： Hiroshi Tomiyasu ,  Teiichiro Umezawa ,  Genshichi Hata ,  Takashi Morikawa ,  Masato Kobayashi ,  Masashi Suzuki ,  Satoshi Yokota ,  Tsuyoshi Watanabe

IPC分类号： G11B11/00 ,  G11B5/66

CPC分类号： G11B5/732 ,  G11B5/40 ,  G11B5/455 ,  G11B5/66 ,  G11B5/7325

摘要： There is disclosed a magnetic recording medium in which a seed layer, under layer, intermediate layer, first magnetic layer, nonmagnetic layer, second magnetic layer, protective layer, and lubricant layer are successively laminated on a glass substrate, the nonmagnetic layer is constituted of an alloy containing Cr and C, and the magnetic layer is constituted of an alloy containing Co and Pt. The under layer includes at least the seed layer for finely dividing the crystal particles of the magnetic layer, the seed layer includes at least two or more layers of nonmagnetic films, and the intermediate layer formed of the material different from that of the nonmagnetic film is interposed between the nonmagnetic films. In measurement of the thermal stability of the magnetic recording medium, a head is used, the head includes a read/write element, and a write track width is twice or more as large as a read track width in the head.

摘要翻译： 公开了一种磁性记录介质，其中在玻璃基板上依次层叠种子层，下层，中间层，第一磁性层，非磁性层，第二磁性层，保护层和润滑剂层，非磁性层由 含有Cr和C的合金，磁性层由含有Co和Pt的合金构成。 底层至少包括用于细分磁性层的晶粒的种子层，种子层包括至少两层或更多层非磁性膜，由不同于非磁性膜的材料形成的中间层是 介于非磁性膜之间。 在测量磁记录介质的热稳定性时，使用磁头，磁头包括读/写元件，写磁道宽度是磁头中读磁道宽度的两倍或更多。

公开(公告)号：US20070248844A1

公开(公告)日：2007-10-25

申请号：US11788426

申请日：2007-04-20

申请人： Hiroshi Tomiyasu ,  Teiichiro Umezawa ,  Genshichi Hata ,  Takashi Morikawa ,  Masato Kobayashi ,  Masashi Suzuki ,  Satoshi Yokota ,  Tsuyoshi Watanabe

发明人： Hiroshi Tomiyasu ,  Teiichiro Umezawa ,  Genshichi Hata ,  Takashi Morikawa ,  Masato Kobayashi ,  Masashi Suzuki ,  Satoshi Yokota ,  Tsuyoshi Watanabe

IPC分类号： G11B5/66

CPC分类号： G11B5/732 ,  G11B5/40 ,  G11B5/455 ,  G11B5/66 ,  G11B5/7325

摘要： There is disclosed a magnetic recording medium in which a seed layer, under layer, intermediate layer, first magnetic layer, nonmagnetic layer, second magnetic layer, protective layer, and lubricant layer are successively laminated on a glass substrate, the nonmagnetic layer is constituted of an alloy containing Cr and C, and the magnetic layer is constituted of an alloy containing Co and Pt. The under layer includes at least the seed layer for finely dividing the crystal particles of the magnetic layer, the seed layer includes at least two or more layers of nonmagnetic films, and the intermediate layer formed of the material different from that of the nonmagnetic film is interposed between the nonmagnetic films. In measurement of the thermal stability of the magnetic recording medium, a head is used, the head includes a read/write element, and a write track width is twice or more as large as a read track width in the head.

摘要翻译： 公开了一种磁性记录介质，其中在玻璃基板上依次层叠种子层，下层，中间层，第一磁性层，非磁性层，第二磁性层，保护层和润滑剂层，非磁性层由 含有Cr和C的合金，磁性层由含有Co和Pt的合金构成。 底层至少包括用于细分磁性层的晶粒的种子层，种子层包括至少两层或更多层非磁性膜，由不同于非磁性膜的材料形成的中间层是 介于非磁性膜之间。 在测量磁记录介质的热稳定性时，使用磁头，磁头包括读/写元件，写磁道宽度是磁头中读磁道宽度的两倍或更多。

公开(公告)号：US08546000B2

公开(公告)日：2013-10-01

申请号：US13096307

申请日：2011-04-28

申请人： Teiichiro Umezawa

发明人： Teiichiro Umezawa

IPC分类号： G11B5/66

CPC分类号： G11B5/82 ,  G11B5/656 ,  G11B5/66

摘要： A perpendicular magnetic disk that includes, a base 110, a granular magnetic layer 160, and a auxiliary recording layer 180 disposed as an upper layer of the granular magnetic layer 160. The granular magnetic layer 160 has a granular structure in which a grain boundary portion is formed by segregation of a non-magnetic substance containing an oxide as a main component around magnetic particles containing a CoCrPt alloy grown in a columnar shape as a main component. The auxiliary recording layer 180 contains a CoCrPtRu alloy as a main component and has a film thickness of 1.5 nm to 4.0 nm. With this structure, the auxiliary recording layer can be thinned while maintaining the function thereof to improve SNR.

摘要翻译： 一种垂直磁盘，其包括基部110，粒状磁性层160和作为粒状磁性层160的上层设置的辅助记录层180.粒状磁性层160具有粒状结构，其中晶界部分 是以包含以柱状形成的CoCrPt合金为主成分的磁性粒子的周围的含有以氧化物为主成分的非磁性物质的偏析而形成的。 辅助记录层180含有CoCrPtRu合金作为主要成分，其膜厚为1.5nm至4.0nm。 利用这种结构，可以减小辅助记录层，同时保持其功能以提高SNR。

公开(公告)号：US20120189872A1

公开(公告)日：2012-07-26

申请号：US13112323

申请日：2011-05-20

申请人： Teiichiro Umezawa ,  Takenori Kajiwara ,  Tokichiro Sato

发明人： Teiichiro Umezawa ,  Takenori Kajiwara ,  Tokichiro Sato

IPC分类号： G11B5/66 ,  B82Y25/00 ,  B82Y10/00

CPC分类号： G11B5/66 ,  C23C16/26

摘要： A perpendicular magnetic disk is provided. The disk includes, on a base and in the order from bottom, a first granular magnetic layer group including a plurality of magnetic layers each having a granular structure, a non-magnetic layer having Ru or a Ru alloy as a main component, a second granular magnetic layer group including a plurality of magnetic layers each having the granular structure, and an auxiliary recording layer having a CoCrPtRu alloy as a main component. Layers closer to a front surface among the plurality of magnetic layers included in the first granular magnetic layer group having an equal or smaller content of Pt. Layers closer to the front surface among the plurality of magnetic layers included in the second granular magnetic layer group having an equal or smaller content of Pt and having an equal or larger content of an oxide.

摘要翻译： 提供垂直磁盘。 该盘在基部上并且从底部开始依次包括具有粒状结构的多个磁性层的第一粒状磁性层组，具有Ru或Ru合金作为主要成分的非磁性层，第二 包括具有颗粒结构的多个磁性层的粒状磁性层组以及以CoCrPtRu合金为主要成分的辅助记录层。 更靠近Pt含量相同或更小的第一粒状磁性层组中包含的多个磁性层中的前表面。 在具有等于或更小含量的Pt并且具有相等或更大含量的氧化物的第二粒状磁性层组中包含的多个磁性层中更靠近前表面的层。

公开(公告)号：US20110104516A1

公开(公告)日：2011-05-05

申请号：US12934979

申请日：2009-03-25

申请人： Teiichiro Umezawa

发明人： Teiichiro Umezawa

IPC分类号： G11B5/65

CPC分类号： G11B5/7325 ,  G11B5/65 ,  G11B5/66

摘要： An object of the present invention is to increase an electromagnetic transducing characteristic (in particular, SNR) by further promoting separation and isolation of magnetic grains of a magnetic recording layer (122) in a perpendicular magnetic recording medium (100). Thus, a typical structure of the perpendicular magnetic recording medium (100) according to the present invention includes, on a substrate (110), at least a non-magnetic granular layer (120) having a granular structure in which a grain boundary part including one or a plurality of oxides is formed between non-magnetic grains each continuously grown in a columnar shape and a magnetic recording layer (122) formed continuously with the non-magnetic granular layer (120) and having a granular structure in which a grain boundary part including one or a plurality of oxides is formed between magnetic grains continuously grown in a columnar shape in this order, and at least one oxide included in the grain boundary part of the non-magnetic granular layer (120) and at least one oxide included in the grain boundary part of the magnetic recording layer (122) are oxides of a same composition.

摘要翻译： 本发明的目的是通过进一步促进垂直磁记录介质（100）中的磁记录层（122）的磁性颗粒的分离和隔离来增加电磁感应特性（特别是SNR）。 因此，根据本发明的垂直磁记录介质（100）的典型结构在基板（110）上至少包括具有颗粒结构的非磁性颗粒层（120），其中包括 在圆柱状连续生长的非磁性颗粒和与非磁性颗粒层（120）连续形成的磁记录层（122）之间形成一个或多个氧化物，并且具有颗粒结构，其中晶界 依次形成以柱状连续生长的磁性颗粒和包含在非磁性粒状层（120）的晶界部分中的至少一种氧化物和包含至少一种氧化物的包含一种或多种氧化物的部分 在磁记录层（122）的晶界部分是具有相同组成的氧化物。

公开(公告)号：US07169487B2

公开(公告)日：2007-01-30

申请号：US10319566

申请日：2002-12-16

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： G11B5/7325 ,  G11B5/64

摘要： In a magnetic recording medium including a glass substrate (1) having a principal surface on which at least a magnetic layer (4) is formed, the magnetic recording medium has a coercive force of 2500 oersted or more in a circumferential direction thereof. The principal surface of the glass substrate is provided with a texture having a predetermined surface roughness so that the magnetic layer is given circumferential magnetic anisotropy. The magnetic recording medium further includes a magnetic anisotropy inducing layer (2) formed between the glass substrate and the magnetic layer so that the magnetic recording medium has an oriented ratio (OR) of 1.1 or more. The oriented ratio (OR) is defined as a ratio of a magnetic characteristic in circumferential direction to another magnetic characteristic in the radial direction.

摘要翻译： 在包括具有至少形成有磁性层（4）的主表面的玻璃基板（1）的磁记录介质中，磁记录介质在其圆周方向上具有2500奥斯特或更大的矫顽力。 玻璃基板的主表面设置有具有预定表面粗糙度的纹理，使得磁性层具有圆周磁各向异性。 磁记录介质还包括形成在玻璃基板和磁性层之间的磁各向异性诱导层（2），使得磁记录介质具有1.1或更大的取向比（OR）。 取向比（OR）定义为圆周方向的磁特性与径向的另一磁特性的比率。

公开(公告)号：US06916558B2

公开(公告)日：2005-07-12

申请号：US10778186

申请日：2004-02-17

申请人： Teiichiro Umezawa ,  Hiroshi Tomiyasu ,  Keiji Moroishi

发明人： Teiichiro Umezawa ,  Hiroshi Tomiyasu ,  Keiji Moroishi

IPC分类号： G11B5/738 ,  G11B5/65 ,  G11B5/66 ,  G11B5/73 ,  B32B7/02

CPC分类号： G11B5/732 ,  G11B5/66 ,  G11B5/7325 ,  Y10T428/24942

摘要： In a magnetic disk having a glass substrate, an amorphous underlayer is formed on the glass substrate. A magnetic layer is formed on the amorphous underlayer. The glass substrate is provided with a texture formed to induce magnetic anisotropy in the magnetic layer. The amorphous underlayer contains a group IVa element on a glass substrate side and a group Va element on a magnetic layer side.

摘要翻译： 在具有玻璃基板的磁盘中，在玻璃基板上形成无定形底层。 在无定形底层上形成磁性层。 玻璃基板具有形成为在磁性层中引起磁各向异性的纹理。 无定形底层包含玻璃基板侧的IVa族元素和磁性层侧的Va族元素。