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公开(公告)号：US20180226092A1
公开(公告)日：2018-08-09
申请号：US15859989
申请日：2018-01-02
Applicant: SHOWA DENKO K.K.
Inventor： Takayuki FUKUSHIMA , Haruhisa OHASHI , Lei ZHANG , Yuji MURAKAMI , Hisato SHIBATA , Takehiro YAMAGUCHI , Tetsuya KANBE
Abstract: A magnetic recording medium includes: a substrate; an underlayer; and a magnetic layer including an alloy having a L10 type crystal structure whose plane orientation is (001). The substrate, the underlayer, and the magnetic layer are stacked in this order. The underlayer includes a first underlayer. The first underlayer is a crystalline layer that includes a material containing Al, Ag, Cu, W, or Mo as a main component element and includes an oxide of the main component element, a content of the oxide of the main component element in the first underlayer being in a range of from 2 mol % to 30 mol %.
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2.发明申请公开(公告)号：US20180174605A1
公开(公告)日：2018-06-21
申请号：US15844717
申请日：2017-12-18
Applicant: SHOWA DENKO K.K.
Inventor： Kota HASEGAWA , Haruhisa OHASHI
Abstract: A magnetic recording medium includes a non-magnetic substrate, a soft magnetic underlayer, an orientation control layer, a perpendicular magnetic layer, and a protective layer arranged in this order. The perpendicular magnetic layer includes a first magnetic layer and a second magnetic layer from the non-magnetic substrate side in this order. The second magnetic layer contains a magnetic grain and provided farthest from the non-magnetic substrate. The first magnetic layer has a granular structure that contains an oxide in a grain boundary. The second magnetic layer has a granular structure that contains a carbide of an element contained in the magnetic grain in a grain boundary.
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3.发明申请公开(公告)号：US20180166100A1
公开(公告)日：2018-06-14
申请号：US15831579
申请日：2017-12-05
Applicant: SHOWA DENKO K.K.
Inventor： Kota HASEGAWA , Haruhisa OHASHI
Abstract: A magnetic recording medium includes a non-magnetic substrate, a soft magnetic underlayer, an orientation control layer, a perpendicular magnetic layer, and a protective layer arranged in this order. The perpendicular magnetic layer includes a first magnetic layer and a second magnetic layer from the non-magnetic substrate side in this order. The second magnetic layer contains a magnetic grain and provided farthest from the non-magnetic substrate. The first magnetic layer has a granular structure that contains an oxide in a grain boundary. The second magnetic layer has a granular structure that contains a nitride of an element contained in the magnetic grain in a grain boundary.
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Patent Agency Ranking
公开(公告)号：US20180211688A1
公开(公告)日：2018-07-26
申请号：US15859973
申请日：2018-01-02
Applicant: SHOWA DENKO K.K.
Inventor： Takayuki FUKUSHIMA , Haruhisa OHASHI , Lei ZHANG , Yuji MURAKAMI , Hisato SHIBATA , Takehiro YAMAGUCHI , Tetsuya KANBE
IPC: G11B5/65
Abstract: A magnetic recording medium includes: a substrate; a first underlayer; a second underlayer; and a magnetic layer including an alloy having a L10 type crystal structure with a (001) orientation. The substrate, the first underlayer, the second underlayer, and the magnetic layer are stacked in this order. The first underlayer is a crystalline layer that includes Mo as a main component. The second underlayer is a crystalline layer that includes a material containing Mo as a main component and that includes an oxide. The content of the oxide in the second underlayer is in a range of from 2 mol % to 30 mol %. The oxide is an oxide of one or more kinds of elements selected from a group consisting of Cr, Mo, Nb, Ta, V, and W.
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公开(公告)号：US20180204591A1
公开(公告)日：2018-07-19
申请号：US15850226
申请日：2017-12-21
Applicant: SHOWA DENKO K.K.
Inventor： Takayuki FUKUSHIMA , Haruhisa OHASHI , Lei ZHANG , Yuji MURAKAMI , Hisato SHIBATA , Takehiro YAMAGUCHI , Tetsuya KANBE
Abstract: A magnetic recording medium includes: a substrate; a first underlayer; a second underlayer; and a magnetic layer including an alloy having a L10 type crystal structure with a (001) orientation. The substrate, the first underlayer the second underlayer, and the magnetic layer are stacked in this order. The first underlayer is a crystalline layer that includes W as a main component. The second underlayer is a crystalline layer that includes a material containing W as a main component and that includes an oxide. The content of the oxide in the second underlayer is in a range of from 2 mol % to 30 mol %. The oxide is an oxide of one or more kinds of elements selected from a group consisting of Cr, Mo, Nb, Ta, V, and W.
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公开(公告)号：US20180358041A1
公开(公告)日：2018-12-13
申请号：US15979965
申请日：2018-05-15
Applicant: SHOWA DENKO K.K. , TOHOKU UNIVERSITY
Inventor： Shintaro HINATA , Shin SAITO , Takayuki FUKUSHIMA , Haruhisa OHASHI , Kazuya NIWA , Lei ZHANG , Yuji MURAKAMI , Hisato SHIBATA , Takehiro YAMAGUCHI , Tetsuya KANBE , Tomoo SHIGE
CPC classification number: G11B5/65 , G11B5/4866 , G11B5/66 , G11B2005/0021
Abstract: A magnetic recording medium includes a substrate, a barrier layer, a crystal grain size control layer, and a magnetic layer that are arranged in this order. The barrier layer includes at least one of oxides, nitrides, and carbides, and the crystal grain size control layer is a crystalline layer including Ag and having an average thickness in a range of 0.1 nm to 1 nm. The barrier layer makes contact with the crystal grain size control layer, and the magnetic layer includes an alloy having a L10 crystal structure and a (001) face orientation.
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7.发明申请公开(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。
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8.发明申请METHOD OF MANUFACTURING MAGNETIC RECORDING MEDIUM, MAGNETIC RECORDING MEDIUM, AND MAGNETIC RECORDING AND REPRODUCING APPARATUS 审中-公开制造磁记录介质，磁记录介质和磁记录和再现装置的方法公开(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
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。
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