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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：US20220319546A1
公开(公告)日：2022-10-06
申请号：US17656964
申请日：2022-03-29
Applicant: SHOWA DENKO K.K. , TOHOKU UNIVERSITY
Inventor： Chen XU , Gohei KUROKAWA , Lei ZHANG , Takayuki FUKUSHIMA , Tomoo SHIGE , Shin SAITO
Abstract: A magnetic recording medium includes a magnesium oxide underlayer including magnesium oxide, and a magnetic layer including an alloy having a L10 structure and includes Fe or Co and Pt. The magnesium oxide has a peak of an O1s spectrum detected in a range of 531 eV to 533 eV when measured by X-ray photoelectron spectroscopy.
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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：US20200005821A1
公开(公告)日：2020-01-02
申请号：US16445801
申请日：2019-06-19
Applicant: SHOWA DENKO K.K.
Inventor： Lei ZHANG , Takayuki FUKUSHIMA , Chen XU , Kazuya NIWA , Hisato SHIBATA , Takehiro YAMAGUCHI , Tetsuya KANBE , Tomoo SHIGE
IPC: G11B5/65
Abstract: A heat-assisted magnetic recording medium includes: a substrate; an underlayer; and a magnetic layer that is (001)-oriented. In the magnetic layer, a first magnetic layer and a second magnetic layer are stacked in this order from the underlayer side. The first magnetic layer and the second magnetic layer include an alloy having an L10 structure. The second magnetic layer includes a ferrite at grain boundaries of magnetic grains. The ferrite is one or more kinds selected from the group consisting of NiFe2O4, MgFe2O4, MnFe2O4, CuFe2O4, ZnFe2O3, CoFe2O4, BaFe2O4, SrFe2O4, and Fe3O4. A Curie temperature of the magnetic grains is lower than a Curie temperature of the ferrite.
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5.发明申请公开(公告)号：US20190180782A1
公开(公告)日：2019-06-13
申请号：US16169065
申请日：2018-10-24
Applicant: SHOWA DENKO K.K.
Inventor： Katsumi MUROFUSHI , Yoshitaka ISHIBASHI , Takayuki FUKUSHIMA , Kazuya NIWA , Lei ZHANG , Yuji MURAKAMI , Hisato SHIBATA , Takehiro YAMAGUCHI , Chen XU , Tetsuya KANBE , Tomoo SHIGE
Abstract: A magnetic recording medium includes a substrate, an underlayer provided on the substrate, and a magnetic layer provided on the underlayer and having a L10 structure and a (001) orientation. The magnetic layer has a granular structure in which an organic compound having a methylene skeleton or a methine skeleton is arranged at grain boundaries of magnetic grains.
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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：US20200005823A1
公开(公告)日：2020-01-02
申请号：US16448187
申请日：2019-06-21
Applicant: SHOWA DENKO K.K. , TOHOKU UNIVERSITY
Inventor： Shin SAITO , Takayuki FUKUSHIMA , Lei ZHANG , Hisato SHIBATA , Takehiro YAMAGUCHI , Chen XU , Tetsuya KANBE , Tomoo SHIGE , Kazuya NIWA , Atsushi HASHIMOTO
IPC: G11B5/73
Abstract: A heat-assisted magnetic recording medium includes: a substrate; an underlayer; and a magnetic layer including an alloy having an L10 structure. The substrate, the underlayer, and the magnetic layer are stacked in the recited order. The underlayer includes a first underlayer. The first underlayer includes magnesium oxide and one or more compounds selected from the group consisting of vanadium oxide, zinc oxide, tin oxide, vanadium nitride, and vanadium carbide, and a total content of the one or more compounds is in a range of 45 mol % to 70 mol %.
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公开(公告)号：US20190355387A1
公开(公告)日：2019-11-21
申请号：US16407412
申请日：2019-05-09
Applicant: SHOWA DENKO K.K.
Inventor： Takayuki FUKUSHIMA , Kazuya NIWA , Lei ZHANG , Hisato SHIBATA , Takehiro YAMAGUCHI , Chen XU , Tetsuya KANBE , Tomoo SHIGE
Abstract: A magnetic recording medium includes: a substrate; an underlayer; and a magnetic layer including an alloy having a L10 structure and a (001) orientation, wherein the substrate, the underlayer, and the magnetic layer are stacked in the recited order, and wherein the magnetic layer has a granular structure and includes a carbon hydride, a boron hydride, or a boron nitride hydride.
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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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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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