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公开(公告)号：US11087794B2
公开(公告)日：2021-08-10
申请号：US15994470
申请日：2018-05-31
Applicant: FUJI ELECTRIC CO., LTD.
Inventor： Tomohiro Moriya , Hitoshi Nakata , Takehito Shimatsu
Abstract: The invention provides a magnetic recording medium including a magnetic layer or a magnetic recording layer having a granular structure in which magnetic crystal grains are well separated from each other. The magnetic recording medium includes a substrate, a seed layer, and a magnetic recording layer, wherein the magnetic recording layer includes a first magnetic layer which is a continuous film consisting of an ordered alloy, and a second magnetic layer having a granular structure consisting of magnetic crystal grains consisting of an ordered alloy and a non-magnetic crystal grain boundary, and the seed layer consists of a material selected from the group consisting of an NaCl-type compound, a spinel-type compound, and a perovskite-type compound.
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公开(公告)号：US20160254017A1
公开(公告)日：2016-09-01
申请号：US15027985
申请日：2015-01-13
Applicant: FUJI ELECTRIC CO., LTD.
Inventor： Hitoshi Nakata , Takehito Shimatsu
CPC classification number: G11B5/653 , G11B5/65 , G11B5/66 , G11B5/7379
Abstract: The purpose of the present invention is to provide a magnetic recording medium including a first magnetic recording layer having a large coercive force and a granular structure in which magnetic crystal grains are well separated from each other. The magnetic recording medium of the present invention includes a non-magnetic substrate, a first seed layer, and a first magnetic recording layer formed on the first seed layer, wherein the first seed layer includes Pt, the first magnetic recording layer includes one or more magnetic layers, the magnetic layer in contact with the first seed layer includes Fe, Pt and Ti, and the magnetic layer in contact with the first seed layer has a granular structure consisting of magnetic crystal grains of a L10 type ordered alloy including Fe and Pt, and a non-magnetic grain boundary including Ti.
Abstract translation: 本发明的目的是提供一种磁记录介质，该磁记录介质包括矫顽磁力大的第一磁记录层和磁结晶彼此良好分离的粒状结构。 本发明的磁记录介质包括非磁性基板，第一种子层和形成在第一种子层上的第一磁记录层，其中第一种子层包括Pt，第一磁记录层包括一个或多个 与第一种子层接触的磁性层包括Fe，Pt和Ti，与第一种子层接触的磁性层具有由包含Fe和Pt的L10型有序合金的磁晶粒构成的粒状结构 ，和含有Ti的非磁性晶界。
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公开(公告)号：US10115424B2
公开(公告)日：2018-10-30
申请号：US15093956
申请日：2016-04-08
Applicant: FUJI ELECTRIC CO., LTD.
Inventor： Tomohiro Moriya , Hitoshi Nakata , Hiroto Kikuchi , Hiroyasu Kataoka , Akira Furuta , Takehito Shimatsu
Abstract: The present invention provides a magnetic recording layer that has a high magnetic anisotropy constant Ku and a low Curie temperature Tc, as well as a magnetic recording medium that incorporates such a magnetic recording layer. The magnetic recording medium of the present invention includes a nonmagnetic substrate and a magnetic recording layer containing an ordered alloy. The ordered alloy may contain at least one element selected from the group consisting of Fe and Ni; at least one element selected from the group consisting of Pt, Pd, Au, Rh and Ir; and Ru.
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公开(公告)号：US09646640B2
公开(公告)日：2017-05-09
申请号：US15033951
申请日：2015-08-10
Applicant: Fuji Electric Co., Ltd.
Inventor： Akira Furuta , Shinji Uchida , Tomohiro Moriya , Hitoshi Nakata , Takehito Shimatsu
Abstract: The purpose of the present invention is to provide a magnetic recording medium including a magnetic recording layer having more excellent magnetic properties and including an L10 type ordered alloy. One constitutional example of the magnetic recording medium includes a substrate, a first seed layer comprising ZnO, a second seed layer comprising MgO, and a magnetic recording layer comprising an ordered alloy, in this order.
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公开(公告)号：US10923150B2
公开(公告)日：2021-02-16
申请号：US15723106
申请日：2017-10-02
Applicant: FUJI ELECTRIC CO., LTD.
Inventor： Tomohiro Moriya , Hitoshi Nakata , Takehito Shimatsu
Abstract: The purpose of the present invention is to provide a magnetic recording medium having a stacked structure of a seed layer including (Mg1-xTix)O and a magnetic recording layer including an L10 ordered alloy, and having improved properties. The method for producing a magnetic recording layer according to the present invention includes the steps of: (1) preparing a substrate; (2) forming a seed layer including (Mg1-xTix)O onto the substrate; (3) plasma etching the seed layer in an atmosphere including inert gas; and (4) forming a magnetic recording layer including an ordered alloy onto the seed layer which has been subjected to the step (3).
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Patent Agency Ranking
公开(公告)号：US10276200B2
公开(公告)日：2019-04-30
申请号：US15336965
申请日：2016-10-28
Applicant: FUJI ELECTRIC CO., LTD.
Inventor： Tomohiro Moriya , Hitoshi Nakata , Hiroyasu Kataoka , Hiroto Kikuchi , Akira Furuta , Takehito Shimatsu
Abstract: The purpose of the invention is to provide a magnetic recording medium in which the surface roughness of the magnetic recording layer can be reduced without deterioration of the magnetic properties of the magnetic recording layer. The magnetic recording medium of the present invention includes a substrate, a seed layer on the substrate, and a magnetic recording layer on the seed layer, wherein the seed layer contains Mn, Cr, and O, and has a spinel structure.
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公开(公告)号：US10115890B2
公开(公告)日：2018-10-30
申请号：US15251056
申请日：2016-08-30
Applicant: FUJI ELECTRIC CO., LTD.
Inventor： Hitoshi Nakata , Takehito Shimatsu
IPC: H01L29/82 , H01L43/10 , B81B7/02 , H01L43/08 , B81B3/00 , G11B5/39 , H01L27/22 , G11B5/65 , H01F10/12 , G11C11/16 , H01F10/32
Abstract: The problem of the invention is to provide a magnetic thin film having a high magnetic anisotropy constant Ku and a high coercive force Hc, and to provide an application device comprising the above magnetic thin film. The magnetic thin film of the present invention includes an ordered alloy including: at least one first element selected from the group consisting of Fe and Ni; at least one second element selected from the group consisting of Pt, Pd, Au and Ir; and Sc.
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公开(公告)号：US20170352372A1
公开(公告)日：2017-12-07
申请号：US15664228
申请日：2017-07-31
Applicant: FUJI ELECTRIC CO., LTD.
Inventor： Tomohiro Moriya , Hitoshi Nakata , Takehito Shimatsu
Abstract: The present invention aims at providing a magnetic recording medium that can lower a Curie temperature (Tc) of a magnetic material, without increasing an in-plane coercive force and lowering magnetic properties. The magnetic recording medium is a magnetic recording medium comprising a substrate and a magnetic recording layer, the magnetic recording layer comprising an FePtRh ordered alloy, wherein a Rh content in the FePtRh ordered alloy is 10 at % or less.
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公开(公告)号：US10741207B2
公开(公告)日：2020-08-11
申请号：US15664228
申请日：2017-07-31
Applicant: FUJI ELECTRIC CO., LTD.
Inventor： Tomohiro Moriya , Hitoshi Nakata , Takehito Shimatsu
Abstract: The present invention aims at providing a magnetic recording medium that can lower a Curie temperature (Tc) of a magnetic material, without increasing an in-plane coercive force and lowering magnetic properties. The magnetic recording medium is a magnetic recording medium comprising a substrate and a magnetic recording layer, the magnetic recording layer comprising an FePtRh ordered alloy, wherein a Rh content in the FePtRh ordered alloy is 10 at % or less.
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公开(公告)号：US10170145B2
公开(公告)日：2019-01-01
申请号：US15857593
申请日：2017-12-28
Applicant: FUJI ELECTRIC CO., LTD.
Inventor： Shinji Uchida , Hitoshi Nakata , Tomohiro Moriya , Akira Furuta , Hirohisa Oyama , Takehito Shimatsu
Abstract: A magnetic recording medium is provided that includes, in the order recited, a substrate; a first seed layer; a second seed layer containing ZnO; a third seed layer containing MgO; and a magnetic recording layer containing an ordered alloy. The first seed layer contains Ru and at least one material selected from the group consisting of oxides, carbides, and nitrides. Employing seed layers enables the magnetic recording medium to be a perpendicular magnetic recording medium by having the magnetic recording layer contain an ordered alloy suitable for perpendicular magnetic recording. Recording density is improved thereby while ensuring required thermal stability. Further, the invention achieves an increased thickness of the magnetic layer and a reduced grain size.
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