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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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2.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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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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Patent Agency Ranking
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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8.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：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：US20170365279A1
公开(公告)日：2017-12-21
申请号：US15596109
申请日：2017-05-16
Applicant: SHOWA DENKO K.K.
Inventor： Takayuki FUKUSHIMA , Yuji MURAKAMI , Tetsuya KANBE , Lei ZHANG , Kazuya NIWA , Hisato SHIBATA
CPC classification number: G11B5/1875 , G11B5/398 , G11B5/65 , G11B5/66 , G11B5/706 , G11B5/70615 , G11B5/716 , G11B5/73 , G11B5/743 , G11B5/8404 , G11B5/855
Abstract: A magnetic recording medium includes a substrate; a lower base layer formed on the substrate; and a (001) oriented L10 magnetic layer formed on the lower base layer and including a first magnetic layer formed on the lower base layer and having a granular structure of magnetic grains and a grain boundary portion, the grain boundary portion containing C, and a second magnetic layer formed on the first magnetic layer and having a granular structure of magnetic grains and a grain boundary portion, the grain boundary portion containing oxide or nitride, the second magnetic layer further containing one or more elements selected from a group consisting of Mg, Ni, Zn, Ge, Pd, Sn, Ag, Re, Au and Pb as an additive.
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