公开(公告)号：US20170221515A1

公开(公告)日：2017-08-03

申请号：US15361658

申请日：2016-11-28

Applicant: SHOWA DENKO K.K.

Inventor： Ken INOUE ,  Kota HASEGAWA

IPC: G11B5/66

CPC classification number: 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 t1 is a film thickness of the i-th magnetic layer, Ku1>Ku2, Ku2>Ku3, Ms1×t1>Ms2×t2, Ms2×t2>Ms3×t3 r Ku3

公开(公告)号：US20150036243A1

公开(公告)日：2015-02-05

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: G11B5/851

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.

Abstract translation: 提供一种制造磁记录介质的方法。 将取向控制层沉积在非磁性基板上以控制其上直接位于其上的层的取向，并且将其易磁化轴主要定向垂直于非磁性基板的垂直磁性层沉积在其上。 在沉积取向控制层时，通过溅射沉积包含Ru或主要由Ru制成的材料的第一颗粒结构层和熔点为1000℃或更低的第一氧化物。 在沉积垂直磁性层时，通过溅射沉积包含磁性颗粒和熔点为1000摄氏度或更低的第二氧化物的第二颗粒结构层，并且使磁性颗粒生长以形成继续存在的柱状晶体 厚度方向。 柱状晶体包括构成取向控制层的晶粒。

公开(公告)号：US20140204484A1

公开(公告)日：2014-07-24

申请号：US14160955

申请日：2014-01-22

Applicant: SHOWA DENKO K.K.

Inventor： Ken INOUE ,  Gohei KUROKAWA ,  Haruhisa OHASHI

IPC: G11B5/851 ,  G11B5/738 ,  C23C14/35

CPC classification number: G11B5/851 ,  C23C14/0688 ,  C23C14/08 ,  C23C14/086 ,  C23C14/165 ,  C23C14/54 ,  G11B5/7325 ,  G11B5/738 ,  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.

Abstract translation: 制造磁记录介质的方法至少包括：在非磁性基板1上形成控制其上一层的取向的取向控制层3; 并且形成垂直磁性层4，其中易磁化轴主要垂直于非磁性基板1定向，其中定向控制层3的形成包括形成具有包括Ru或 通过溅射法，Ru是主要成分的材料和熔点大于或等于450℃且小于或等于1000℃的氧化物，并且形成垂直磁性层 图4包括生长晶粒以形成与形成取向控制层3的晶粒一起在厚度方向上连续的柱状晶体。

公开(公告)号：US20140104997A1

公开(公告)日：2014-04-17

申请号：US14051005

申请日：2013-10-10

Applicant: SHOWA DENKO K.K. ,  TOHOKU UNIVERSITY ,  KABUSHIKI KAISHA TOSHIBA

Inventor： Hisato SHIBATA ,  Ken INOUE ,  Tsubasa OKADA ,  Gohei KUROKAWA ,  Shin SAITO ,  Shintaro HINATA ,  Migaku TAKAHASHI ,  Tomoyuki MAEDA ,  Yosuke ISOWAKI ,  Akira KIKITSU

IPC: G11B5/738

CPC classification number: G11B5/73 ,  G11B5/7325 ,  G11B5/84

Abstract: A magnetic recording medium is disclosed in which, on a non-magnetic substrate 1, at least an orientation control layer that controls orientation of a layer immediately above and a vertical magnetic layer in which an easy axis of magnetization is mainly vertically oriented with respect to the non-magnetic substrate are laminated. The orientation control layer includes an Ru-containing layer containing Ru or Ru alloy, and a diffusion prevention layer provided on the Ru-containing layer on the side of the vertical magnetic layer, is made of a material having a melting point of 1500° C. or higher and 4215° C. or lower and formed by a covalent bond or an ionic bond, and prevents thermal diffusion of Ru atoms of the Ru-containing layer. The vertical magnetic layer has a crystalline structure of crystal grains continuously formed from the Ru-containing layer with the diffusion prevention layer interposed therebetween, and includes a columnar crystal continuously formed in a thickness direction together with the crystal grains.

Abstract translation: 公开了一种磁记录介质，其中，在非磁性基板1上，至少一个控制刚刚上方的层的取向的取向控制层和易磁化轴主要垂直于相对于 非磁性基板层压。 取向控制层包括含有Ru或Ru合金的含Ru层，并且设置在垂直磁性层侧的Ru含有层上的扩散防止层由熔点为1500℃的材料制成 或更高和4215℃或更低，并且通过共价键或离子键形成，并且防止含Ru层的Ru原子的热扩散。 垂直磁性层具有由含Ru扩散层连续地形成的晶粒的结晶结构，其间具有扩散防止层，并且包括与晶粒一起在厚度方向上连续形成的柱状晶体。