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公开(公告)号：US10699737B2
公开(公告)日：2020-06-30
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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公开(公告)号：US10832720B2
公开(公告)日：2020-11-10
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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公开(公告)号：US10829848B2
公开(公告)日：2020-11-10
申请号：US15844717
申请日：2017-12-18
Applicant: SHOWA DENKO K.K.
Inventor： Kota Hasegawa , Haruhisa Ohashi
IPC: C23C14/08 , C23C14/00 , C23C28/00 , C23C14/35 , G11B5/851 , G11B5/82 , G11B5/65 , C23C14/18 , G11B5/66
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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Patent Agency Ranking
公开(公告)号：US10803895B2
公开(公告)日：2020-10-13
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
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：US10283154B2
公开(公告)日：2019-05-07
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
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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公开(公告)号：US10706884B2
公开(公告)日：2020-07-07
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：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.
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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
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.
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