公开(公告)号：US10283155B2

公开(公告)日：2019-05-07

申请号：US15361658

申请日：2016-11-28

Applicant: SHOWA DENKO K.K.

Inventor： Ken Inoue ,  Kota Hasegawa

IPC: G11B5/66

Abstract: A magnetic recording medium includes a non-magnetic substrate on which at least a soft magnetic underlayer, an orientation control layer, a perpendicular magnetic layer, and a protective layer are disposed. The perpendicular magnetic layer includes first to fourth magnetic layers. A first exchange coupling control layer is disposed between the first magnetic layer and the second magnetic layer. A second exchange coupling control layer is disposed between the second magnetic layer and the third magnetic layer. Following relations are satisfied where Kui is a magnetic anisotropic constant of an i-th magnetic layer, Msi is a saturation magnetization of the i-th magnetic layer, and ti is a film thickness of the i-th magnetic layer, Ku1>Ku2, Ku2>Ku3, Ms1×t1>Ms2×t2, Ms2×t2>Ms3×t3, Ku3

公开(公告)号：US20140139952A1

公开(公告)日：2014-05-22

申请号：US13946938

申请日：2013-07-19

Applicant: KABUSHIKI KAISHA TOSHIBA ,  Showa Denko K.K. ,  Tohoku University

Inventor： Akihiko Takeo ,  Akira Kikitsu ,  Tomoyuki Maeda ,  Migaku Takahashi ,  Shin Saito ,  Ken Inoue ,  Gohei Kurokawa

IPC: G11B5/127 ,  H03B28/00

CPC classification number: G11B5/1278 ,  G11B5/235 ,  G11B5/3146 ,  G11B5/656 ,  G11B5/732 ,  G11B5/7325 ,  G11B2005/0024 ,  H01F10/30 ,  H01F10/3286 ,  H01F10/329 ,  H01F41/30 ,  H03B15/006 ,  H03B28/00

Abstract: According to one embodiment, there is provided a thin magnetic film having a negative anisotropy of −6×106 erg/cm3 or less and including, on at least a nonmagnetic substrate, at least one seed layer made of a metal or metal compound, a ruthenium underlayer for controlling the orientation of an immediately overlying layer, and a magnetic layer having negative anisotropy in the normal line direction perpendicular to a surface of the magnetic layer and mainly containing Co and Ir, wherein the additive element concentration of Ir in the magnetic layer is 10 (inclusive) to 45 (inclusive) at %.

Abstract translation: 根据一个实施方案，提供了一种具有-6×106erg / cm 3或更小的负各向异性的薄磁膜，并且在至少一个非磁性基底上至少包括由金属或金属化合物制成的至少一个晶种层， 钌底层，用于控制直接上覆层的取向，以及在与磁性层的表面垂直的法线方向上具有负各向异性的磁性层，主要含有Co和Ir，其中磁性层中的添加元素浓度 为10（含）至45（含）％。

公开(公告)号：US08837087B2

公开(公告)日：2014-09-16

申请号：US13946938

申请日：2013-07-19

Applicant: Kabushiki Kaisha Toshiba ,  Tohoku University ,  Showa Denko K.K.

Inventor： Akihiko Takeo ,  Akira Kikitsu ,  Tomoyuki Maeda ,  Migaku Takahashi ,  Shin Saito ,  Ken Inoue ,  Gohei Kurokawa

IPC: G11B5/127

CPC classification number: G11B5/1278 ,  G11B5/235 ,  G11B5/3146 ,  G11B5/656 ,  G11B5/732 ,  G11B5/7325 ,  G11B2005/0024 ,  H01F10/30 ,  H01F10/3286 ,  H01F10/329 ,  H01F41/30 ,  H03B15/006 ,  H03B28/00

Abstract: According to one embodiment, there is provided a thin magnetic film having a negative anisotropy of −6×106 erg/cm3 or less and including, on at least a nonmagnetic substrate, at least one seed layer made of a metal or metal compound, a ruthenium underlayer for controlling the orientation of an immediately overlying layer, and a magnetic layer having negative anisotropy in the normal line direction perpendicular to a surface of the magnetic layer and mainly containing Co and Ir, wherein the additive element concentration of Ir in the magnetic layer is 10 (inclusive) to 45 (inclusive) at %.

Abstract translation: 根据一个实施方案，提供了一种具有-6×106erg / cm 3或更小的负各向异性的薄磁膜，并且在至少一个非磁性基底上至少包括由金属或金属化合物制成的至少一个晶种层， 钌底层，用于控制直接上覆层的取向，以及在与磁性层的表面垂直的法线方向上具有负各向异性的磁性层，主要含有Co和Ir，其中磁性层中的添加元素浓度 为10（含）至45（含）％。

公开(公告)号：US10056103B2

公开(公告)日：2018-08-21

申请号：US14160955

申请日：2014-01-22

Applicant: SHOWA DENKO K.K.

Inventor： Ken Inoue ,  Gohei Kurokawa ,  Haruhisa Ohashi

IPC: C23C14/34 ,  G11B5/851 ,  G11B5/738 ,  C23C14/08 ,  C23C14/54 ,  G11B5/73 ,  G11B5/84 ,  C23C14/06 ,  C23C14/16

CPC classification number: G11B5/851 ,  C23C14/0688 ,  C23C14/08 ,  C23C14/086 ,  C23C14/165 ,  C23C14/54 ,  G11B5/73 ,  G11B5/7325 ,  G11B5/8404

Abstract: A method of manufacturing a magnetic recording medium, includes at least: forming an orientation control layer 3 that controls orientation of an immediately above layer thereof on a non-magnetic substrate 1; and forming a perpendicular magnetic layer 4 in which an easy axis of magnetization is mainly perpendicularly orientated to the non-magnetic substrate 1, in which the forming of the orientation control layer 3 includes forming a granular layer having a granular structure that includes Ru or a material in which Ru is a main component and an oxide having a melting point which is greater than or equal to 450° C. and less than or equal to 1000° C., by a sputtering method, and the forming of the perpendicular magnetic layer 4 includes growing crystal grains to form columnar crystals that are continuous in a thickness direction together with crystal grains that form the orientation control layer 3.

公开(公告)号：US09959895B2

公开(公告)日：2018-05-01

申请号：US14446450

申请日：2014-07-30

Applicant: SHOWA DENKO K.K.

Inventor： Ken Inoue ,  Kenji Shimizu ,  Gohei Kurokawa ,  Haruhisa Ohashi

IPC: C23C14/34 ,  G11B5/851 ,  C23C14/08 ,  G11B5/65 ,  G11B5/66 ,  G11B5/84

CPC classification number: G11B5/851 ,  C23C14/08 ,  G11B5/65 ,  G11B5/66 ,  G11B5/8404

Abstract: A method for manufacturing a magnetic recording medium is provided. An orientation control layer is deposited on a non-magnetic substrate to control an orientation of a layer located directly thereon, and a perpendicular magnetic layer whose easy axis of magnetization is mainly oriented perpendicular to the non-magnetic substrate is deposited thereon. In depositing the orientation control layer, a first granular structure layer containing Ru or a material mainly made of Ru and a first oxide having a melting point of 1000 degrees C. or lower are deposited by sputtering. In depositing the perpendicular magnetic layer, a second granular structure layer containing magnetic particles and a second oxide having a melting point of 1000 degrees C. or lower are deposited by sputtering, and the magnetic particles are grown so as to form a columnar crystal continuing in a thickness direction. The columnar crystal includes crystal grains constituting the orientation control layer.