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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：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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4.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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5.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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Patent Agency Ranking
公开(公告)号：US20180240487A1
公开(公告)日：2018-08-23
申请号：US15868239
申请日：2018-01-11
Applicant: SHOWA DENKO K.K.
Inventor： Kazuya NIWA , Lei ZHANG , Yuji MURAKAMI , Hisato SHIBATA , Takayuki FUKUSHIMA , Takehiro YAMAGUCHI , Tetsuya KANBE
CPC classification number: G11B5/65 , G11B5/4866 , G11B5/667 , G11B5/706 , G11B5/7325 , G11B2005/0021
Abstract: A magnetic recording medium includes a substrate, a first heat sink layer, a barrier layer, a second heat sink layer, and a magnetic layer that are successively stacked. The magnetic layer is made of a material including a first main component that is an alloy having a L10 crystal structure and a content of 50 at % or higher, or content of 50 mol % or higher. The barrier layer is made of a material including a second main component that is one of an oxide, a nitride, and a carbide having a content of 50 at % or higher, or content of 50 mol % or higher.
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公开(公告)号：US20180182423A1
公开(公告)日：2018-06-28
申请号：US15903492
申请日：2018-02-23
Applicant: SHOWA DENKO K.K.
Inventor： Lei ZHANG , Tetsuya KANBE , Yuji MURAKAMI , Kazuya NIWA
IPC: G11B5/73
CPC classification number: G11B5/73 , G11B5/7325
Abstract: A magnetic recording medium includes a substrate, multiple underlayers formed on the substrate, and a magnetic layer foisted on the multiple underlayers. A main component of the magnetic layer is an alloy having a L10 structure. At least one of the multiple underlayers is a crystalline underlayer containing W. The W is a main component of the crystalline underlayer. The crystalline underlayer further contains 1 mol % or more to 20 mol % or less of one or more kinds of elements selected from B, Si, and C. A barrier layer including a material having a NaCl structure is formed between the crystalline underlayer and the magnetic layer.
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公开(公告)号：US20150029830A1
公开(公告)日：2015-01-29
申请号：US14326555
申请日：2014-07-09
Applicant: SHOWA DENKO K.K.
Inventor： Lei ZHANG , Tetsuya KANBE , Yuji MURAKAMI , Kazuya NIWA
IPC: G11B5/65
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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公开(公告)号：US20150009786A1
公开(公告)日：2015-01-08
申请号：US14316950
申请日：2014-06-27
Applicant: SHOWA DENKO K.K.
Inventor： Tetsuya KANBE , Kazuya NIWA , Yuji MURAKAMI , Lei ZHANG
CPC classification number: G11B5/667 , G11B5/314 , G11B5/65 , G11B5/653 , G11B5/656 , G11B5/7325 , G11B5/82 , G11B20/10 , G11B2005/0021 , G11B2005/0024 , G11B2020/10898
Abstract: A magnetic recording medium includes a substrate, a magnetic layer including an alloy having an L10 type crystal structure, and a plurality of underlayers arranged between the substrate and the magnetic layer. At least one of the plurality of underlayers is a soft magnetic underlayer formed by an alloy having a hexagonal close packed (hcp) structure and including Co metal or Co as its main component, with a (11•0) plane oriented parallel to a surface of the substrate.
Abstract translation: 磁记录介质包括基板，包括具有L10型晶体结构的合金的磁性层和布置在基板和磁性层之间的多个底层。 所述多个底层中的至少一个是由具有六方密堆积（hcp）结构并且包括Co金属或Co作为其主要成分的合金形成的软磁性底层，具有平行于表面的（11·0）面 的基底。
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公开(公告)号：US20140376127A1
公开(公告)日：2014-12-25
申请号：US14305118
申请日：2014-06-16
Applicant: SHOWA DENKO K.K.
Inventor： Tetsuya KANBE , Kazuya NIWA , Yuji MURAKAMI , Lei ZHANG
CPC classification number: G11B5/738 , G11B5/65 , G11B5/66 , G11B5/7325
Abstract: A magnetic recording medium includes a substrate, a magnetic layer including a FePt alloy having a L10 type structure, and a plurality of underlayers arranged between the substrate and the magnetic layer, wherein at least one of the plurality of underlayers includes TiO2.
Abstract translation: 磁记录介质包括基板，包括具有L10型结构的FePt合金的磁性层和布置在基板和磁性层之间的多个底层，其中多个底层中的至少一个包括TiO 2。
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