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公开(公告)号：US11846605B2
公开(公告)日：2023-12-19
申请号：US17804659
申请日：2022-05-31
Applicant: SHOWA DENKO K.K.
Inventor： Lei Zhang , Fumito Kudo , Yuki Hirai , Masayuki Makita , Kensuke Yamanaka
Abstract: A magnetic property measuring apparatus measures magnetic properties of a magnetic recording medium, and includes a rotating mechanism which rotates the magnetic recording medium, a heating or cooling mechanism which heats or cools the magnetic recording medium; a temperature measuring mechanism which measures a temperature of the magnetic recording medium, a laser heating mechanism, disposed opposite to a measurement site of the magnetic recording medium, which heats the measurement site without making contact with the measurement site, a magnetic write part, disposed opposite to the measurement site, which magnetizes the measurement site without making contact with the measurement site, and a magnetic read part, disposed opposite to the measurement site, which reads a magnetic flux leakage at the measurement site without making contact with the measurement site.
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公开(公告)号：US11024334B2
公开(公告)日：2021-06-01
申请号：US16835770
申请日：2020-03-31
Applicant: SHOWA DENKO K.K.
Inventor： Takayuki Fukushima , Chen Xu , Lei Zhang , Hisato Shibata , Takehiro Yamaguchi , Kazuya Niwa , Tomoo Shige , Hiroaki Nemoto , Yuji Umemoto , Hiroshi Koyanagi
IPC: G11B11/105 , G11B5/65 , G11B5/66 , G11B5/60 , G11B5/00
Abstract: A magnetic recording medium includes a substrate, an underlayer, and a magnetic layer that are arranged in this order. The magnetic layer has a granular structure including magnetic grains having a L10 crystal structure, and grain boundary parts having a volume fraction in a range of 25 volume % to 50 volume %. The magnetic grains have a c-axis orientation with respect to the substrate. The grain boundary parts include a material having a lattice constant in a range of 0.30 nm to 0.36 nm, or in a range of 0.60 nm to 0.72 nm.
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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：US09230588B2
公开(公告)日：2016-01-05
申请号：US14326555
申请日：2014-07-09
Applicant: SHOWA DENKO K.K.
Inventor： Lei Zhang , Tetsuya Kanbe , Yuji Murakami , Kazuya Niwa
CPC classification number: G11B5/65 , G11B5/7325 , G11B2005/0021
Abstract: A magnetic recording medium includes a substrate, a magnetic layer including an alloy having an L10 type crystal structure as a main component thereof, a plurality of underlayers arranged between the substrate and the magnetic layer, and a barrier layer made of a material having an NaCl structure. The plurality of underlayers include at least one crystalline underlayer including Mo as a main component thereof, and at least one of Si and C in a range of 1 mol % to 20 mol % and an oxide in a range of 1 vol % to 50 vol %. The barrier layer is provided between the magnetic layer and the at least one crystalline underlayer including Mo.
Abstract translation: 磁记录介质包括基板，包括具有L10型晶体结构的合金作为其主要成分的磁性层，布置在基板和磁性层之间的多个底层，以及由具有NaCl的材料制成的阻挡层 结构体。 多个底层包括至少一种包含Mo作为其主要成分的晶体底层，以及Si和C中的至少一种在1mol％至20mol％的范围内，氧化物在1vol％至50vol ％。 阻挡层设置在磁性层和包含Mo的至少一个结晶底层之间。
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Patent Agency Ranking
6.发明授权公开(公告)号：US08792313B2
公开(公告)日：2014-07-29
申请号：US13972041
申请日：2013-08-21
Applicant: Showa Denko K.K.
Inventor： Kazuya Niwa , Tetsuya Kanbe , Yuji Murakami , Lei Zhang
IPC: G11B11/00
CPC classification number: G11B13/08 , G11B5/65 , G11B5/73 , G11B5/7325 , G11B2005/0024
Abstract: A magnetic recording medium of the present invention includes an under layer formed on a substrate, and a magnetic layer, formed on the under layer, which contains an alloy having an L10-type crystal structure as a main component. The under layer includes, in order from the substrate side, a first under layer with a lattice constant a of 2.87 Å≦a
Abstract translation: 本发明的磁记录介质包括形成在基板上的底层和形成在下层上的磁性层，其含有具有L10型晶体结构的合金作为主要成分。 底层从衬底侧依次包括具有晶格常数a为2.87的第一底层; a <3.04，具有晶格常数a为3.04和nlE的BCC结构的第二下层; a <3.18 Å，具有晶格常数a为3.18和n1E;a≤331的BCC结构的第三下层，以及具有NaCl型晶体结构的上下层。 第一底层具有B2结构，或具有含有Cr作为主要成分的BCC结构。 在本发明的磁记录介质中，使用热辅助磁记录型或微波辅助磁记录型来记录信息。
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公开(公告)号：US11676632B2
公开(公告)日：2023-06-13
申请号：US17104504
申请日：2020-11-25
Applicant: SHOWA DENKO K.K.
Inventor： Takayuki Fukushima , Lei Zhang , Chen Xu , Hisato Shibata , Takehiro Yamaguchi , Hiroshi Koyanagi , Yuji Umemoto
CPC classification number: G11B5/736 , C23C14/0057 , C23C14/081 , C23C14/34 , C23C14/35 , G11B5/716 , G11B5/7369 , G11B5/851 , Y10T428/115
Abstract: The present invention relates to a magnetic recording medium including a substrate; an underlayer laminated upon the substrate; and a magnetic layer laminated upon the underlayer, wherein the underlayer includes a first underlayer containing a compound represented by a following general formula: MgO(1-X), where X is within a range of 0.07 to 0.25, the magnetic layer includes a first magnetic layer containing an alloy having a L10 structure, and the alloy having the L10 structure includes B, and the first underlayer is in contact with the first magnetic layer.
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公开(公告)号：US11189313B2
公开(公告)日：2021-11-30
申请号：US17141367
申请日：2021-01-05
Applicant: SHOWA DENKO K.K.
Inventor： Koichi Nagasaka , Takayuki Fukushima , Lei Zhang , Chen Xu , Hisato Shibata , Takehiro Yamaguchi , Hiroshi Koyanagi , Yuji Umemoto
Abstract: A magnetic recording medium includes a substrate, an underlayer provided above the substrate, and a magnetic layer provided on and in contact with the underlayer. The underlayer includes a compound represented by a general formula MgO(1-x), where x falls within a range of 0.07 to 0.25. The magnetic layer includes an alloy having a L10 structure, and the alloy having the L10 structure includes one or more elements selected from a group consisting of Al, Si, Ga, and Ge.
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公开(公告)号：US11037591B2
公开(公告)日：2021-06-15
申请号：US16433377
申请日：2019-06-06
Applicant: SHOWA DENKO K.K.
Inventor： Lei Zhang , Chen Xu , Takayuki Fukushima , Kazuya Niwa , Tetsuya Kanbe , Hisato Shibata , Takehiro Yamaguchi , Tomoo Shige
Abstract: A heat-assisted magnetic recording medium includes: a substrate; an underlayer; and a magnetic layer including an alloy having an L10 structure, wherein the underlayer includes, from the substrate side, a bcc underlayer including a substance having a bcc structure, a first oxide layer that is in contact with the bcc underlayer, and a second oxide layer that is in contact with the magnetic layer. The bcc underlayer, the first oxide layer, and the second oxide layer are stacked in the recited order. The first oxide layer and the second oxide layer include magnesium oxide, and the second oxide layer further includes one or more compounds selected from the group consisting of vanadium oxide, vanadium nitride, and vanadium carbide.
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公开(公告)号：US10008220B2
公开(公告)日：2018-06-26
申请号：US15596109
申请日：2017-05-16
Applicant: SHOWA DENKO K.K.
Inventor： Takayuki Fukushima , Yuji Murakami , Tetsuya Kanbe , Lei Zhang , Kazuya Niwa , Hisato Shibata
IPC: G11B5/82 , G11B5/187 , G11B5/706 , G11B5/74 , G11B5/716 , G11B5/855 , G11B5/39 , G11B5/66 , G11B5/73 , G11B5/84 , G11B5/65
CPC classification number: G11B5/1875 , G11B5/398 , G11B5/65 , G11B5/66 , G11B5/706 , G11B5/70615 , G11B5/716 , G11B5/73 , G11B5/743 , G11B5/82 , G11B5/8404 , G11B5/855
Abstract: A magnetic recording medium includes a substrate; a lower base layer formed on the substrate; and a (001) oriented L10 magnetic layer formed on the lower base layer and including a first magnetic layer formed on the lower base layer and having a granular structure of magnetic grains and a grain boundary portion, the grain boundary portion containing C, and a second magnetic layer formed on the first magnetic layer and having a granular structure of magnetic grains and a grain boundary portion, the grain boundary portion containing oxide or nitride, the second magnetic layer further containing one or more elements selected from a group consisting of Mg, Ni, Zn, Ge, Pd, Sn, Ag, Re, Au and Pb as an additive.
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