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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：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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公开(公告)号：US20220310119A1
公开(公告)日：2022-09-29
申请号：US17650119
申请日：2022-02-07
Applicant: SHOWA DENKO K.K.
Inventor： Takehiro YAMAGUCHI , Hisato SHIBATA , Takayuki FUKUSHIMA , Chen XU
Abstract: A magnetic recording medium includes a substrate, an underlayer provided on the substrate and including MgO, and a magnetic layer provided on the underlayer and including an alloy having a L10 crystal structure. The magnetic layer includes first, second, and third magnetic recording layers successively provided in this order above the underlayer. A Curie temperature of the second magnetic recording layer is lower than a Curie temperature of each of the first and third magnetic recording layers, by a value which falls within a range of 30 K to 100 K. An average grain diameter of magnetic grains at a bottom surface portion of the first magnetic recording layer is smaller by 15% or more than average grain diameters of magnetic grains at bottom surface portions of the second and third magnetic recording layers.
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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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Patent Agency Ranking
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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7.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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8.发明申请HEAT-ASSISTED MAGNETIC RECORDING MEDIUM AND MAGNETIC RECORDING AND READING APPARATUS 有权热辅助磁记录介质和磁记录和读取装置公开(公告)号：US20130194901A1
公开(公告)日：2013-08-01
申请号：US13749934
申请日：2013-01-25
Applicant: SHOWA DENKO K.K.
Inventor： Tetsuya KANBE , Atsushi HASHIMOTO , Takayuki FUKUSHIMA
IPC: G11B5/73
CPC classification number: G11B5/7325 , G11B5/65
Abstract: The heat-assisted magnetic recording medium of the present invention has a substrate, an under layer formed on the substrate, and a magnetic layer formed on the under layer, in which the magnetic layer includes an alloy having a L10 structure as a principle component, and the under layer is constituted by a first under layer made of an amorphous alloy or an alloy having a microcrystalline structure, a second under layer made of Cr or an alloy which contains Cr as a principle component and has a BCC structure, a third under layer made of a metal or an alloy having a BCC structure with a lattice constant of 2.98 Å or more, and a fourth under layer made of MgO.
Abstract translation: 本发明的热辅助磁记录介质具有基板，形成在基板上的下层和形成在下层上的磁性层，其中磁性层包括具有L10结构的合金作为主要成分， 底层由非晶合金或具有微晶结构的合金制成的第一下层，由Cr制成的第二下层或含有Cr作为主要成分并具有BCC结构的合金构成，第三下面 具有晶格常数为2.98以上的BCC结构的金属或合金制成的层和由MgO构成的第四下层。
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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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10.发明申请公开(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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