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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：US10304485B2
公开(公告)日：2019-05-28
申请号：US15640809
申请日：2017-07-03
Applicant: FUJI ELECTRIC CO., LTD.
Inventor： Tsuyoshi Yoshizawa , Hiroto Kikuchi , Takehito Shimatsu
Abstract: The present invention aims at providing a magnetic recording medium capable of realizing lowering of recording temperature. A magnetic recording medium comprises a substrate, and a magnetic recording layer comprising a first magnetic layer and a second magnetic layer, in which the second magnetic layer comprises an FePtRh ordered alloy, and the first magnetic layer has Ku at room temperature larger than Ku of the second magnetic layer at room temperature.
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公开(公告)号：US20160293198A1
公开(公告)日：2016-10-06
申请号：US15035670
申请日：2014-12-02
Applicant: FUJI ELECTRIC CO., LTD.
Inventor： Shinji Uchida , Takehito Shimatsu
Abstract: A magnetic recording medium including a magnetic recording layer of a granular structure and having a large thickness as well as excellent magnetic properties is provided. The perpendicular magnetic recording medium includes a non-magnetic substrate and a magnetic recording layer, wherein the magnetic recording layer includes first magnetic recording layers on the side of the non-magnetic substrate and second magnetic recording layers, the first magnetic layers have a granular structure including first magnetic crystal grains containing an ordered alloy and a first non-magnetic segregant surrounding the first magnetic crystal grains and containing carbon; and the second magnetic layers have a granular structure including second magnetic crystal grains containing an ordered alloy and a second non-magnetic segregant surrounding the second magnetic crystal grains and containing Zn and O.
Abstract translation: 提供了包括粒状结构的磁记录层并且具有大厚度以及优异的磁特性的磁记录介质。 垂直磁记录介质包括非磁性基板和磁记录层，其中磁记录层包括在非磁性基板一侧的第一磁记录层和第二磁记录层，第一磁性层具有颗粒结构 包括含有有序合金的第一磁性晶粒和围绕第一磁性晶粒并含有碳的第一非磁性分离器; 并且第二磁性层具有包含含有有序合金的第二磁性晶粒和围绕第二磁性晶粒的含有Zn和O的第二非磁性分离体的粒状结构。
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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：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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Patent Agency Ranking
公开(公告)号：US10714138B2
公开(公告)日：2020-07-14
申请号：US15694074
申请日：2017-09-01
Applicant: FUJI ELECTRIC CO., LTD.
Inventor： Shinji Uchida , Takehito Shimatsu
Abstract: The magnetic recording medium includes at least a nonmagnetic substrate and a magnetic recording layer, the magnetic recording layer consists of a first magnetic recording layer or a plurality of layers including at least the first magnetic recording layer and a second magnetic recording layer, the first magnetic recording layer has a granular structure including a first magnetic crystal grain and a first nonmagnetic crystal grain boundary, the first magnetic crystal grain consists of an ordered alloy having Fe, Pt and Rh, the first nonmagnetic crystal grain boundary consists of carbon, boron or a combination thereof, the second magnetic recording layer has a granular structure including a second magnetic crystal grain and a second nonmagnetic crystal grain boundary, the second magnetic crystal grain consists of an FePt ordered alloy or an ordered alloy having Fe, Pt and Rh, and the second nonmagnetic crystal grain boundary includes carbon.
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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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公开(公告)号：US20170301367A1
公开(公告)日：2017-10-19
申请号：US15640809
申请日：2017-07-03
Applicant: FUJI ELECTRIC CO., LTD.
Inventor： Tsuyoshi Yoshizawa , Hiroto Kikuchi , Takehito Shimatsu
CPC classification number: G11B5/653 , G11B5/65 , G11B5/66 , G11B5/82 , G11B2005/0021
Abstract: The present invention aims at providing a magnetic recording medium capable of realizing lowering of recording temperature. A magnetic recording medium comprises a substrate, and a magnetic recording layer comprising a first magnetic layer and a second magnetic layer, in which the second magnetic layer comprises an FePtRh ordered alloy, and the first magnetic layer has Ku at room temperature larger than Ku of the second magnetic layer at room temperature.
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公开(公告)号：US20170178674A1
公开(公告)日：2017-06-22
申请号：US15445231
申请日：2017-02-28
Applicant: FUJI ELECTRIC CO., LTD.
Inventor： Hitoshi Nakata , Tomohiro Moriya , Takehito Shimatsu
CPC classification number: G11B5/653 , G11B5/7379
Abstract: The present invention relates to a magnetic recording medium, and this magnetic recording medium includes at least a non-magnetic substrate and a magnetic recording layer. In the magnetic recording medium of the present invention, the magnetic recording layer includes an ordered alloy having an L10-ordered structure, includes Fe, Pt, and V, and has a composition of Pt>Fe. The magnetic recording layer preferably has a granular structure composed of magnetic crystal grains including the ordered alloy and a non-magnetic crystal grain boundary, and the non-magnetic crystal grain boundary includes
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公开(公告)号：US09672855B2
公开(公告)日：2017-06-06
申请号：US14560708
申请日：2014-12-04
Applicant: FUJI ELECTRIC CO., LTD.
Inventor： Hiroyasu Kataoka , Hiroto Kikuchi , Akira Furuta , Shinji Uchida , Takehito Shimatsu
Abstract: A perpendicular magnetic recording medium includes at least a nonmagnetic substrate and a magnetic recording layer. The magnetic recording layer is constituted by a plurality of layers that includes at least a first magnetic recording layer and a second magnetic recording layer. The first magnetic recording layer has a granular structure that includes first magnetic crystal grains and first nonmagnetic crystal grain boundaries surrounding the first magnetic crystal grains. The first magnetic crystal grains include an ordered alloy, and the first nonmagnetic crystal grain boundaries are constituted by carbon. The second magnetic recording layer has a granular structure that includes second magnetic crystal grains and a second nonmagnetic crystal grain boundaries that surround the second magnetic crystal grains. The second magnetic crystal grains include an ordered alloy, and the second nonmagnetic crystal grain boundaries are constituted by a carbon-containing nonmagnetic material.
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