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公开(公告)号：US20200075053A1
公开(公告)日：2020-03-05
申请号：US16519157
申请日：2019-07-23
Applicant: SHOWA DENKO K.K.
Inventor： Takayuki FUKUSHIMA , Koji TAKE , Hisato SHIBATA , Takehiro YAMAGUCHI , Tomoo SHIGE , Lei ZHANG , Chen XU , Yuji UMEMOTO , Hiroshi KOYANAGI , Kazuya NIWA , Tetsuya KANBE
IPC: G11B11/105 , G11B5/73 , G11B11/24
Abstract: A heat-assisted magnetic recording medium includes a substrate, an underlayer, and a magnetic layer including an alloy having a L10 crystal structure and first and second layers, arranged in this order. Each of the first and second layers has a granular structure including C, SiO2, and BN at grain boundaries. Vol % of the grain boundaries in each of the first and second layers is 25 to 45 vol %. Vol % of C in the first layer is 5 to 22 vol %, and a volume ratio of SiO2 with respect to BN in each of the first and second layers is 0.25 to 3.5. Vol % of SiO2 in the second layer is greater than that of the first layer by 5 vol % or more. Vol % of BN in the second layer is smaller than that in the first layer by 2 vol % or more.
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公开(公告)号：US20210256998A1
公开(公告)日：2021-08-19
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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Patent Agency Ranking
公开(公告)号：US20200327905A1
公开(公告)日：2020-10-15
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
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：US20210201944A1
公开(公告)日：2021-07-01
申请号：US17116223
申请日：2020-12-09
Applicant: SHOWA DENKO K.K.
Inventor： Takehiro YAMAGUCHI , Takayuki FUKUSHIMA , Lei ZHANG , Hisato SHIBATA , Chen XU , Hiroshi KOYANAGI , Yuji UMEMOTO
IPC: G11B5/706
Abstract: A magnetic recording medium includes a substrate; a soft magnetic underlayer laminated on the substrate; an amorphous barrier layer laminated on the soft magnetic underlayer; and a magnetic recording layer laminated on the amorphous barrier layer, wherein the soft magnetic underlayer includes Fe, B, Si, and one or more elements selected from the group consisting of Nb, Zr, Mo, and Ta, wherein the amorphous barrier layer includes Si, W, and one or more elements selected from the group consisting of Nb, Zr, Mo, and Ta, and wherein the magnetic recording layer includes an alloy having an L10 structure.
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公开(公告)号：US20190392863A1
公开(公告)日：2019-12-26
申请号：US16445772
申请日：2019-06-19
Applicant: SHOWA DENKO K.K.
Inventor： Takayuki FUKUSHIMA , Hisato SHIBATA , Yuji UMEMOTO , Kazuya NIWA , Lei ZHANG , Takehiro YAMAGUCHI , Chen XU , Tomoo SHIGE , Hiroshi KOYANAGI
IPC: G11B5/65
Abstract: A magnetic recording medium includes: a substrate; an underlayer; a magnetic layer including an alloy having an L10 type crystal structure; and a protective layer, wherein the substrate, the underlayer, the magnetic layer, and the protective layer are stacked in the recited order. A pinning layer is further included between the magnetic layer and the protective layer, and the pinning layer includes a magnetic material including Co and includes at least one metal selected from the group consisting of Cu, Ag, Au, and Al.
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公开(公告)号：US20220358962A1
公开(公告)日：2022-11-10
申请号：US17658003
申请日：2022-04-05
Applicant: SHOWA DENKO K.K.
Inventor： Takayuki FUKUSHIMA , Tomoo SHIGE , Yuji UMEMOTO , Kazuya NIWA
Abstract: A magnetic recording medium includes a substrate, and a magnetic recording layer including magnetic grains having an L10 structure. The magnetic recording layer is (001) oriented, and a surface of growth of the magnetic recording layer includes a (001) plane, a (111) plane, and planes equivalent to the (111) plane. An area ratio of the (111) plane and the planes equivalent to the (111) plane, represented by (A111+A111e)/(A001+A111+A111e), is in a range of 0.2 to 0.7, where A111 denotes an area of the (111) plane, A111e denotes an area of the planes equivalent to the (111) plane, and A001 denotes an area of the (001) plane.
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公开(公告)号：US20210201947A1
公开(公告)日：2021-07-01
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
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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