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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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Patent Agency Ranking
16.发明申请公开(公告)号：US20130208578A1
公开(公告)日：2013-08-15
申请号：US13764144
申请日：2013-02-11
Applicant: SHOWA DENKO K.K.
Inventor： Tetsuya KANBE , Kazuya NIWA , Yuji MURAKAMI , Lei ZHANG
IPC: G11B5/66
Abstract: Disclosed is a magnetic recording medium having a structure in which at least an underlayer, a first magnetic layer and a second magnetic layer are sequentially stacked on a substrate, wherein the first magnetic layer includes an alloy having an L1o structure as a main component, and wherein the second magnetic layer includes a non-crystalline alloy including Co as a main component and containing Zr of 6 to 16 atomic percent and at least one element of B and Ta.
Abstract translation: 公开了一种磁记录介质，其结构是至少在衬底上依次层叠底层，第一磁性层和第二磁性层，其中第一磁性层包括具有L1o结构作为主要成分的合金，以及 其中所述第二磁性层包括包含Co作为主要成分并含有6至16原子％的Zr和至少一种B和Ta元素的非晶态合金。
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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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