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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
摘要： 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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公开(公告)号：US10276200B2
公开(公告)日：2019-04-30
申请号：US15336965
申请日：2016-10-28
发明人： Tomohiro Moriya , Hitoshi Nakata , Hiroyasu Kataoka , Hiroto Kikuchi , Akira Furuta , Takehito Shimatsu
摘要： 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：US20170206919A1
公开(公告)日：2017-07-20
申请号：US15476466
申请日：2017-03-31
CPC分类号： G11B5/66 , C23C14/14 , C23C14/185 , C23C14/34 , G11B5/653 , G11B5/656 , G11B5/82 , G11B5/851
摘要： The purpose of the present invention is to provide a magnetic recording medium making secondary growth of magnetic crystal grains inhibited, having a magnetic recording layer having a large film thickness, and exhibiting excellent magnetic characteristics, and to provide a method for producing the medium. A magnetic recording medium according to the present invention includes a substrate and a magnetic recording layer that includes a lower layer and an upper layer, in which the lower layer and the upper layer include magnetic crystal grains formed of an ordered alloy and non-magnetic grain boundaries, the lower layer is formed by depositing Bi, C and an element constituting the ordered alloy, and the upper layer is formed by depositing C and an element constituting the ordered alloy. The present invention also provides a method for producing the above-described magnetic recording medium.
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公开(公告)号：US11120829B2
公开(公告)日：2021-09-14
申请号：US16287651
申请日：2019-02-27
发明人： Hiroyasu Kataoka , Tsuyoshi Yoshizawa , Tomohiro Moriya , Shinji Uchida , Hirohisa Oyama , Takehito Shimatsu
摘要： A magnetic recording medium with a reduced average grain diameter and reduced grain diameter dispersion is provided. A magnetic recording medium having a magnetic property (magnetic anisotropy energy) applicable as a magnetic recording medium is provided. It is a magnetic recording medium containing a substrate, a grain diameter control layer, a first seed layer, a second seed layer, and a magnetic recording layer containing an ordered alloy in this order, in which the second seed layer is composed of crystal grains having TiN as a main component, and a grain boundary material having at least one or more selected from the group consisting of metal oxides and carbon as a main component.
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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
发明人： Tomohiro Moriya , Hitoshi Nakata , Hiroto Kikuchi , Hiroyasu Kataoka , Akira Furuta , Takehito Shimatsu
摘要： 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：US10062404B2
公开(公告)日：2018-08-28
申请号：US15102639
申请日：2015-05-12
CPC分类号： G11B5/851 , G11B5/64 , G11B5/65 , G11B5/653 , G11B5/66 , G11B5/7379 , G11B5/84 , G11B5/8404 , H01F10/123
摘要： A method for manufacturing perpendicular magnetic recording medium which includes magnetic recording layer having desired film thickness while maintaining high magnetic anisotropy and having more homogenized magnetic characteristics. The method includes: (A) preparing non-magnetic substrate; (B) laminating magnetic recording layer on the substrate; and (C) heating the substrate on which the magnetic recording layer is laminated to a temperature of 400 to 600° C. The step (B) includes at least forming a first magnetic recording layer and a second magnetic layer thereon. The first layer has a granular structure including a first magnetic crystal grain constituted by an ordered alloy surrounded by a first non-magnetic grain boundary constituted by carbon, and the second layer has a granular structure including a second magnetic crystal grain constituted by an ordered alloy surrounded by a second non-magnetic grain boundary constituted by a non-magnetic material constituted by boron and carbon.
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公开(公告)号：US10566019B2
公开(公告)日：2020-02-18
申请号：US15611503
申请日：2017-06-01
发明人： Hiroyasu Kataoka , Hiroto Kikuchi , Akira Furuta , Hitoshi Nakata , Tomohiro Moriya , Takehito Shimatsu
摘要： The purpose of the present invention is to provide a magnetic recording medium capable of reducing the surface roughness of the magnetic recording layer without adversely affecting 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 has a structure of: (a) a spinel structure consisting of Mg, Cr and O; (b) a spinel structure consisting of Zn, Fe and O; or (c) an inverse spinel structure consisting of Mg, Ti and O.
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公开(公告)号：US20170270955A1
公开(公告)日：2017-09-21
申请号：US15611503
申请日：2017-06-01
发明人： Hiroyasu Kataoka , Hiroto Kikuchi , Akira Furuta , Hitoshi Nakata , Tomohiro Moriya , Takehito Shimatsu
CPC分类号： G11B5/7379 , G11B5/65
摘要： The purpose of the present invention is to provide a magnetic recording medium capable of reducing the surface roughness of the magnetic recording layer without adversely affecting 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 has a structure of: (a) a spinel structure consisting of Mg, Cr and O; (b) a spinel structure consisting of Zn, Fe and O; or (c) an inverse spinel structure consisting of Mg, Ti and O.
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公开(公告)号：US20170125050A1
公开(公告)日：2017-05-04
申请号：US15102639
申请日：2015-05-12
CPC分类号： G11B5/851 , G11B5/64 , G11B5/65 , G11B5/653 , G11B5/66 , G11B5/732 , G11B5/84 , G11B5/8404 , H01F10/123
摘要： A method for manufacturing perpendicular magnetic recording medium which includes magnetic recording layer having desired film thickness while maintaining high magnetic anisotropy and having more homogenized magnetic characteristics. The method includes: (A) preparing non-magnetic substrate; (B) laminating magnetic recording layer on the substrate; and (C) heating the substrate on which the magnetic recording layer is laminated to a temperature of 400 to 600° C. The step (B) includes at least forming a first magnetic recording layer and a second magnetic layer thereon. The first layer has a granular structure including a first magnetic crystal grain constituted by an ordered alloy surrounded by a first non-magnetic grain boundary constituted by carbon, and the second layer has a granular structure including a second magnetic crystal grain constituted by an ordered alloy surrounded by a second non-magnetic grain boundary constituted by a non-magnetic material constituted by boron and carbon.
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公开(公告)号：US20170047090A1
公开(公告)日：2017-02-16
申请号：US15336965
申请日：2016-10-28
发明人： Tomohiro Moriya , Hitoshi Nakata , Hiroyasu Kataoka , Hiroto Kikuchi , Akira Furuta , Takehito Shimatsu
摘要： 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.
摘要翻译： 本发明的目的是提供一种磁记录介质，其中可以降低磁记录层的表面粗糙度，而不会降低磁记录层的磁特性。 本发明的磁记录介质包括衬底，衬底上的种子层和种子层上的磁记录层，其中种子层包含Mn，Cr和O，并且具有尖晶石结构。
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