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公开(公告)号：US11244700B2
公开(公告)日：2022-02-08
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：US09245567B2
公开(公告)日：2016-01-26
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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公开(公告)号：US10803895B2
公开(公告)日：2020-10-13
申请号：US15859973
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; a first underlayer; a second underlayer; and a magnetic layer including an alloy having a L10 type crystal structure with a (001) orientation. The substrate, the first underlayer, the second underlayer, and the magnetic layer are stacked in this order. The first underlayer is a crystalline layer that includes Mo as a main component. The second underlayer is a crystalline layer that includes a material containing Mo as a main component and that includes an oxide. The content of the oxide in the second underlayer is in a range of from 2 mol % to 30 mol %. The oxide is an oxide of one or more kinds of elements selected from a group consisting of Cr, Mo, Nb, Ta, V, and W.
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公开(公告)号：US10283154B2
公开(公告)日：2019-05-07
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
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：US09230588B2
公开(公告)日：2016-01-05
申请号：US14326555
申请日：2014-07-09
Applicant: SHOWA DENKO K.K.
Inventor： Lei Zhang , Tetsuya Kanbe , Yuji Murakami , Kazuya Niwa
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
6.发明授权公开(公告)号：US08792313B2
公开(公告)日：2014-07-29
申请号：US13972041
申请日：2013-08-21
Applicant: Showa Denko K.K.
Inventor： Kazuya Niwa , Tetsuya Kanbe , Yuji Murakami , Lei Zhang
IPC: G11B11/00
CPC classification number: G11B13/08 , G11B5/65 , G11B5/73 , G11B5/7325 , G11B2005/0024
Abstract: A magnetic recording medium of the present invention includes an under layer formed on a substrate, and a magnetic layer, formed on the under layer, which contains an alloy having an L10-type crystal structure as a main component. The under layer includes, in order from the substrate side, a first under layer with a lattice constant a of 2.87 Å≦a
Abstract translation: 本发明的磁记录介质包括形成在基板上的底层和形成在下层上的磁性层，其含有具有L10型晶体结构的合金作为主要成分。 底层从衬底侧依次包括具有晶格常数a为2.87的第一底层; a <3.04，具有晶格常数a为3.04和nlE的BCC结构的第二下层; a <3.18 Å，具有晶格常数a为3.18和n1E;a≤331的BCC结构的第三下层，以及具有NaCl型晶体结构的上下层。 第一底层具有B2结构，或具有含有Cr作为主要成分的BCC结构。 在本发明的磁记录介质中，使用热辅助磁记录型或微波辅助磁记录型来记录信息。
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公开(公告)号：US11037591B2
公开(公告)日：2021-06-15
申请号：US16433377
申请日：2019-06-06
Applicant: SHOWA DENKO K.K.
Inventor： Lei Zhang , Chen Xu , Takayuki Fukushima , Kazuya Niwa , Tetsuya Kanbe , Hisato Shibata , Takehiro Yamaguchi , Tomoo Shige
Abstract: A heat-assisted magnetic recording medium includes: a substrate; an underlayer; and a magnetic layer including an alloy having an L10 structure, wherein the underlayer includes, from the substrate side, a bcc underlayer including a substance having a bcc structure, a first oxide layer that is in contact with the bcc underlayer, and a second oxide layer that is in contact with the magnetic layer. The bcc underlayer, the first oxide layer, and the second oxide layer are stacked in the recited order. The first oxide layer and the second oxide layer include magnesium oxide, and the second oxide layer further includes one or more compounds selected from the group consisting of vanadium oxide, vanadium nitride, and vanadium carbide.
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公开(公告)号：US10008220B2
公开(公告)日：2018-06-26
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
IPC: G11B5/82 , G11B5/187 , G11B5/706 , G11B5/74 , G11B5/716 , G11B5/855 , G11B5/39 , G11B5/66 , G11B5/73 , G11B5/84 , G11B5/65
CPC classification number: G11B5/1875 , G11B5/398 , G11B5/65 , G11B5/66 , G11B5/706 , G11B5/70615 , G11B5/716 , G11B5/73 , G11B5/743 , G11B5/82 , 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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9.发明申请公开(公告)号：US20150085628A1
公开(公告)日：2015-03-26
申请号：US14394958
申请日：2013-05-10
Applicant: SHOWA DENKO K.K.
Inventor： Kazuya Niwa , Tetsuya Kanbe , Yuji Murakami , Lei Zhang
CPC classification number: G11B5/7325 , G11B5/65 , G11B5/653 , G11B5/656 , G11B5/66 , G11B11/10589 , G11B2005/0021 , G11B2005/0024
Abstract: A thermally-assisted magnetic recording medium or a microwave-assisted magnetic recording medium includes: an orientation control layer (104) that is formed on a substrate (101); an underlayer (10) that is formed on the orientation control layer (104); and a magnetic layer (108) that is formed on the underlayer (10) and contains an alloy having an L10 type crystal structure as a main component, in which the underlayer (10) includes an MgO underlayer (107) that contains MgO and has a (100) orientation and a nitride underlayer (106) that contains at least one nitride selected from the group consisting of TaN, NbN, and HfN and has a (100) orientation.
Abstract translation: 热辅助磁记录介质或微波辅助磁记录介质包括：形成在基板（101）上的取向控制层（104）; 形成在取向控制层（104）上的底层（10）; 以及形成在所述下层（10）上并含有具有L10型晶体结构的合金作为主要成分的磁性层（108），其中所述底层（10）包括含有MgO的MgO底层（107），并且具有 （100）取向和含有选自TaN，NbN和HfN中的至少一种氮化物并具有（100）取向的氮化物底层（106）。
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公开(公告)号：US08988828B2
公开(公告)日：2015-03-24
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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