公开(公告)号：US20230131031A1

公开(公告)日：2023-04-27

申请号：US18146647

申请日：2022-12-27

Applicant: SHOWA DENKO K.K.

Inventor： Yoshitaka AONO ,  Takahiro UKAI ,  Takanao EBISAWA ,  Kazuya NIWA ,  Takayuki KONNO

IPC: G11B5/667 ,  G11B5/851

Abstract: A method of manufacturing a magnetic recording medium including: forming a diffusion preventing layer, wherein the magnetic recording medium includes a non-magnetic substrate; an underlayer; a perpendicular magnetic layer; the diffusion preventing layer; and a protective layer, wherein the perpendicular magnetic layer has a multi-layer structure, the perpendicular magnetic layer includes an uppermost layer and at least one layer other than the uppermost layer, the uppermost layer including Co or Fe in magnetic particles, and the at least one layer other than the uppermost layer including an oxide, the diffusion preventing layer is provided between the perpendicular magnetic layer and the protective layer, and the diffusion preventing layer includes at least one component selected from a group consisting of Si, Ti, Cr, B, and Ru, or either a carbide, an oxide, or both, of the at least one component.

公开(公告)号：US20220246176A1

公开(公告)日：2022-08-04

申请号：US17649588

申请日：2022-02-01

Applicant: SHOWA DENKO K.K.

Inventor： Yoshitaka AONO ,  Takahiro UKAI ,  Takanao EBISAWA ,  Kazuya NIWA ,  Takayuki KONNO

IPC: G11B5/667 ,  G11B5/851

Abstract: A magnetic recording medium including: a non-magnetic substrate; an underlayer; a perpendicular magnetic layer; a diffusion preventing layer; and a protective layer, wherein the underlayer, the perpendicular magnetic layer, the diffusion preventing layer, and the protective layer are layered on the non-magnetic substrate in this order, the perpendicular magnetic layer has a multi-layer structure, the perpendicular magnetic layer includes an uppermost layer and at least one layer other than the uppermost layer, the uppermost layer including Co or Fe in magnetic particles, and the at least one layer other than the uppermost layer including an oxide, the diffusion preventing layer is provided between the perpendicular magnetic layer and the protective layer, and the diffusion preventing layer includes at least one component selected from a group consisting of Si, Ti, Cr, B, and Ru, or either a carbide, an oxide, or both, of the at least one component.

公开(公告)号：US20160148633A1

公开(公告)日：2016-05-26

申请号：US14935529

申请日：2015-11-09

Applicant: SHOWA DENKO K.K. ,  JAPAN ATOMIC ENERGY AGENCY

Inventor： Kota HASEGAWA ,  Takahiro UKAI ,  Eishin YAMAKAWA ,  Shiro ENTANI ,  Seiji SAKAI

IPC: G11B5/73 ,  G11B5/72 ,  G11B5/127

CPC classification number: G11B5/72 ,  G11B5/66 ,  G11B5/82

Abstract: A perpendicular magnetic recording medium includes a perpendicular magnetic layer provided above a nonmagnetic substrate, and a protection layer provided on the perpendicular magnetic layer. The perpendicular magnetic layer has an hcp structure, and includes stacked layers having a (0002) crystal plane oriented parallel to a surface of the nonmagnetic substrate. An uppermost layer amongst the stacked layers includes polycrystal grains selected from a CoCr-base alloy, a CoPt-base alloy, a CoCrPt-base alloy, and a CoPtCr-base alloy. The protection layer makes contact with the uppermost layer of the perpendicular magnetic layer, and includes a single graphene layer or a graphene stack, and an amorphous carbon layer. The single graphene layer or the graphene stack is bonded in parallel to a (0002) crystal plane of the polycrystal grains.

Abstract translation: 垂直磁记录介质包括设置在非磁性衬底上的垂直磁性层和设置在垂直磁性层上的保护层。 垂直磁性层具有hcp结构，并且包括具有平行于非磁性基底的表面取向的（0002）晶面的堆叠层。 堆叠层中的最上层包括选自CoCr基合金，CoPt基合金，CoCrPt基合金和CoPtCr基合金的多晶粒。 保护层与垂直磁性层的最上层接触，并且包括单个石墨烯层或石墨烯叠层和无定形碳层。 单个石墨烯层或石墨烯层与多晶粒的（0002）晶面平行地结合。