公开(公告)号：US20070148499A1

公开(公告)日：2007-06-28

申请号：US10576755

申请日：2005-06-29

Applicant: Yoshiaki Sonobe ,  Teiichiro Umezawa ,  Chikara Takasu

Inventor： Yoshiaki Sonobe ,  Teiichiro Umezawa ,  Chikara Takasu

IPC: G11B5/66 ,  C23C14/00

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

Abstract: 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.

Abstract translation: 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：US20090117408A1

公开(公告)日：2009-05-07

申请号：US12295573

申请日：2007-03-31

Applicant: Teiichiro Umezawa ,  Lianjun Wu ,  Yoshiaki Sonobe ,  Chikara Takasu ,  Takahiro Onoue

Inventor： Teiichiro Umezawa ,  Lianjun Wu ,  Yoshiaki Sonobe ,  Chikara Takasu ,  Takahiro Onoue

IPC: G11B5/66 ,  C23C14/35

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

Abstract: To provide a perpendicular magnetic recording disk having a film structure that improves overwrite characteristics (O/W) while maintaining a coercive force (Hc) high enough not to affect heat fluctuation resistance, and a manufacturing method thereof.A magnetic disk for use in perpendicular magnetic recording, having at least an underlayer, a first magnetic recording layer, and a second magnetic recording layer on a substrate in the order named, characterized in that the first magnetic recording layer and the second magnetic recording layer are each a ferromagnetic layer of a granular structure containing a nonmagnetic substance forming grain boundary portions between crystal grains containing at least Co (cobalt) and, given that the content of the nonmagnetic substance in the first magnetic recording layer is A mol % and the content of the nonmagnetic substance in the second magnetic recording layer is B mol %, A

Abstract translation: 提供一种具有提高覆盖特性（O / W）的膜结构的垂直磁记录盘及其制造方法，同时保持矫顽力（Hc）足够高以不影响耐热波动性。 一种用于垂直磁记录的磁盘，其特征在于，具有至少下层，第一磁记录层和第二磁记录层，其特征在于，第一磁记录层和第二磁记录层 分别是含有形成至少包含Co（钴）的晶粒之间的晶界部分的非磁性物质的粒状结构的铁磁层，并且考虑到第一磁记录层中的非磁性物质的含量为A摩尔％，含量 的第二磁记录层中的非磁性物质为B摩尔％，A

公开(公告)号：US20090191331A1

公开(公告)日：2009-07-30

申请号：US12295550

申请日：2007-03-31

Applicant: Teiichiro Umezawa ,  Takahiro Onoue ,  Chikara Takasu ,  Kong Kim

Inventor： Teiichiro Umezawa ,  Takahiro Onoue ,  Chikara Takasu ,  Kong Kim

IPC: B05D5/12

CPC classification number: G11B5/667 ,  G11B5/84

Abstract: [Object] To provide a manufacturing method that can easily enhance a reversed domain nucleation magnetic field of a magnetic recording layer in a perpendicular magnetic recording medium having, over a substrate, a soft magnetic layer, the magnetic recording layer having a granular structure, and a continuous layer having a high perpendicular magnetic anisotropy.[Solution] A perpendicular magnetic recording medium manufacturing method according to this invention is characterized by including a soft magnetic layer forming step of forming a soft magnetic layer over a substrate, a magnetic recording layer forming step of forming a magnetic recording layer having a granular structure as an upper layer of the soft magnetic layer, a continuous layer forming step of forming a continuous layer having a perpendicular magnetic anisotropy as an upper layer or a lower layer of the magnetic recording layer, and a heating step of heating a medium, obtained by forming the continuous layer in the continuous layer forming step, for improving a value of a reversed domain nucleation magnetic field.

Abstract translation: 本发明提供一种能够容易地增强磁性记录层的反磁畴成核磁场的制造方法，该垂直磁记录介质在基板上具有软磁性层，具有粒状结构的磁记录层，以及 具有高垂直磁各向异性的连续层。 [解决方案]根据本发明的垂直磁记录介质制造方法的特征在于包括在基板上形成软磁性层的软磁性层形成步骤，形成具有粒状结构的磁记录层的磁记录层形成步骤 作为软磁性层的上层，形成具有垂直磁各向异性的连续层作为磁记录层的上层或下层的连续层形成步骤和加热介质的加热步骤，其通过 在连续层形成步骤中形成连续层，以改善反向畴状成核磁场的值。

公开(公告)号：US08603650B2

公开(公告)日：2013-12-10

申请号：US10576755

申请日：2005-06-29

Applicant: Yoshiaki Sonobe ,  Teiichiro Umezawa ,  Chikara Takasu

Inventor： Yoshiaki Sonobe ,  Teiichiro Umezawa ,  Chikara Takasu

IPC: G11B5/673

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

Abstract: 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.

Abstract translation: 用于垂直磁记录的磁盘10在基板1上至少具有磁记录层。磁记录层由含有硅（Si）或硅（Si）的氧化物的粒状结构的铁磁层5构成， 在含有钴（Co）的晶粒之间，具有包含钴（Co）或Co合金的第一层的堆叠层7和包含钯（Pd）或铂（Pt）的第二层的间隔层6和介于铁磁性 层5和堆叠层7.在氩气气氛中通过溅射在基板1上形成铁磁层5之后，层叠层7通过在氩气气氛中以比形成 铁磁层5。

公开(公告)号：US20090311557A1

公开(公告)日：2009-12-17

申请号：US12295562

申请日：2007-03-31

Applicant: Takahiro Onoue ,  Kong Kim ,  Yoshiaki Sonobe ,  Chikara Takasu

Inventor： Takahiro Onoue ,  Kong Kim ,  Yoshiaki Sonobe ,  Chikara Takasu

IPC: G11B5/66 ,  G11B5/33 ,  B05D5/12

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

Abstract: [Object] To achieve a high coercive force (Hc) and low-noise characteristics (high S/N ratio) through realization of both segregation of SiO2 and high perpendicular magnetic anisotropy by providing a two-layer structure having magnetic recording layers with different properties.[Solution] A magnetic disk for use in perpendicular magnetic recording, having at least an underlayer 5, a first magnetic recording layer 6, and a second magnetic recording layer 7 on a substrate in this order. The first magnetic recording layer 6 and the second magnetic recording layer 7 are each a ferromagnetic layer of a granular structure containing a nonmagnetic substance forming grain boundary portions between crystal grains containing at least Co (cobalt). Given that the content of the nonmagnetic substance in the first magnetic recording layer 6 is A mol % and the content of the nonmagnetic substance in the second magnetic recording layer 7 is B mol %, A>B.

Abstract translation: [目的]通过提供具有不同性质的磁记录层的双层结构，通过实现SiO 2的偏析和高垂直磁各向异性来实现高矫顽力（Hc）和低噪声特性（高S / N比） 。 [解决方案]用于垂直磁记录的磁盘，其依次在基板上至少具有底层5，第一磁记录层6和第二磁记录层7。 第一磁记录层6和第二磁记录层7分别是包含在至少包含Co（钴）的晶粒之间形成晶界部分的非磁性物质的粒状结构的铁磁层。 假设第一磁记录层6中的非磁性物质的含量为A摩尔％，第二磁记录层7中的非磁性物质的含量为B摩尔％，则A> B。