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1. 发明授权

US09911445B2 Magnetic recording medium 有权
公开(公告)号：US09911445B2
公开(公告)日：2018-03-06
申请号：US14678925
申请日：2015-04-03
申请人： FUJI ELECTRIC CO., LTD.
发明人： Shinji Uchida
IPC分类号： G11B5/65 , G11B5/73 , G11B5/738
CPC分类号： G11B5/653 , G11B5/1278 , G11B5/65 , G11B5/7315 , G11B5/7325 , G11B5/738 , G11B5/82
摘要： A perpendicular magnetic recording medium includes a non-magnetic substrate; an underlayer including first and second underlayers; and a magnetic recording layer including a layer having a granular structure including grains of a magnetic crystal and grain boundary portions, wherein the first underlayer has a NaCl structure with a (001) orientation and contains a nitride or an oxide of at least one element. The first underlayer may contain a nitride of at least one of Cr, V, Ti, Sc, Mo, Nb, Zr, Y, Al, and B, and the second underlayer may include a plurality of island-shaped regions and contain at least one of Mg, Ca, Co, and Ni. The first underlayer may contains an oxide of at least one of Mg, Ca, Co, and Ni, and the second underlayer may include net-shaped regions and contain at least one of Cr, V, Ti, Sc, Mo, Nb, Zr, Y, Al, B, and C.

2. 发明申请

US20140322561A1 MAGNETIC RECORDING MEDIUM 有权
标题翻译：磁记录介质
公开(公告)号：US20140322561A1
公开(公告)日：2014-10-30
申请号：US14365345
申请日：2013-06-07
申请人： FUJI ELECTRIC CO., LTD.
发明人： Shinji Uchida
IPC分类号： G11B5/82 , G11B5/667
CPC分类号： G11B5/82 , G11B5/667
摘要： A magnetic recording medium is disclosed. The magnetic recording medium includes at least a disc-shaped non-magnetic substrate having a hole at a center, a soft magnetic underlying layer, and a magnetic recording layer. Relative permeability of the soft magnetic underlying layer under a magnetic field having one of the frequencies 100 MHz to 700 MHz increases gradually from a disc outer circumference to a disc inner circumference and a characteristic frequency of the relative permeability increases gradually from the disc inner circumference to the disc outer circumference.
摘要翻译：公开了一种磁记录介质。磁记录介质至少包括在中心具有孔的盘形非磁性基底，软磁性底层和磁记录层。具有100MHz至700MHz频率的磁场之下的软磁下层的相对磁导率从盘外周向盘内周逐渐增加，并且相对磁导率的特征频率从盘内圆周逐渐增加到圆盘外圆。

3. 发明申请

US20160293198A1 PERPENDICULAR MAGNETIC RECORDING MEDIUM 有权
标题翻译：全能磁记录介质
公开(公告)号：US20160293198A1
公开(公告)日：2016-10-06
申请号：US15035670
申请日：2014-12-02
申请人： FUJI ELECTRIC CO., LTD.
发明人： Shinji Uchida , Takehito Shimatsu
IPC分类号： G11B5/82 , G11B5/65 , G11B5/667
CPC分类号： G11B5/66 , G11B5/65 , G11B5/653 , G11B5/656 , G11B5/667 , G11B5/82
摘要： 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.
摘要翻译：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。

4. 发明授权

US09190092B1 Magnetic recording medium and method for producing the same 有权
标题翻译：磁记录介质及其制造方法
公开(公告)号：US09190092B1
公开(公告)日：2015-11-17
申请号：US14580290
申请日：2014-12-23
申请人： FUJI ELECTRIC CO., LTD.
发明人： Shinji Uchida
IPC分类号： G11B5/74 , G11B7/2407 , G11B5/82 , G11B5/84 , G11B7/2405
CPC分类号： G11B5/74 , C25D11/04 , C25D11/16 , G11B5/743 , G11B5/746 , G11B5/82 , G11B5/84 , G11B5/855 , G11B7/2405 , G11B7/2407 , G11B20/1217 , G11B2020/1238
摘要： A patterned magnetic recording medium, accessible by a magnetic recording head, including a plurality of tracks, a width direction of each track and that of the magnetic recording head being of a skew angle. The patterned magnetic recording medium includes a plurality of magnetic dots, each corresponding to a recording bit, formed on a non-magnetic material. The plurality of magnetic dots are arranged in a plurality of arrays, each array corresponding to one of the tracks. Every N adjacent magnetic dots of the array define a polygon, one side thereof being parallel to the corresponding track, and another side thereof being parallel to a direction determined by the skew angle of the corresponding track.
摘要翻译：一种可由磁记录头访问的图案化磁记录介质，包括多个磁道，每个磁道的宽度方向和磁记录头的宽度方向为偏斜角。图案化磁记录介质包括形成在非磁性材料上的多个磁点，每个磁点对应于记录位。多个磁点排列成多个阵列，每个阵列对应于一个轨道。阵列的每N个相邻的磁点限定一个多边形，其一侧平行于相应的轨道，另一侧平行于由对应轨道的倾斜角确定的方向。

5. 发明授权

US08980447B2 Magnetic recording medium having a soft magnetic underlayer with tailored relative permeability regions 有权
标题翻译：具有具有定制的相对磁导率区域的软磁性底层的磁记录介质
公开(公告)号：US08980447B2
公开(公告)日：2015-03-17
申请号：US14365345
申请日：2013-06-07
申请人： Fuji Electric Co., Ltd.
发明人： Shinji Uchida
IPC分类号： G11B5/667 , G11B5/82
CPC分类号： G11B5/82 , G11B5/667
摘要： A magnetic recording medium is disclosed. The magnetic recording medium includes at least a disc-shaped non-magnetic substrate having a hole at a center, a soft magnetic underlying layer, and a magnetic recording layer. Relative permeability of the soft magnetic underlying layer under a magnetic field having one of the frequencies 100 MHz to 700 MHz increases gradually from a disc outer circumference to a disc inner circumference and a characteristic frequency of the relative permeability increases gradually from the disc inner circumference to the disc outer circumference.
摘要翻译：公开了一种磁记录介质。磁记录介质至少包括在中心具有孔的盘形非磁性基底，软磁性底层和磁记录层。具有100MHz至700MHz频率的磁场之下的软磁下层的相对磁导率从盘外周向盘内周逐渐增加，并且相对磁导率的特征频率从盘内圆周逐渐增加到圆盘外圆。

6. 发明授权

US10714138B2 Perpendicular magnetic recording medium 有权
公开(公告)号：US10714138B2
公开(公告)日：2020-07-14
申请号：US15694074
申请日：2017-09-01
申请人： FUJI ELECTRIC CO., LTD.
发明人： Shinji Uchida , Takehito Shimatsu
IPC分类号： G11B5/65 , G11B5/66 , G11B5/706 , G11B5/714
摘要： 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.

7. 发明授权

US10170145B2 Magnetic recording medium and method for producing the same 有权
公开(公告)号：US10170145B2
公开(公告)日：2019-01-01
申请号：US15857593
申请日：2017-12-28
申请人： FUJI ELECTRIC CO., LTD.
发明人： Shinji Uchida , Hitoshi Nakata , Tomohiro Moriya , Akira Furuta , Hirohisa Oyama , Takehito Shimatsu
IPC分类号： G11B5/66 , G11B5/73 , G11B5/65 , G11B5/738 , G11B5/851 , G11B5/84
摘要： 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.

8. 发明授权

US09928866B2 Method for manufacturing magnetic recording medium 有权
公开(公告)号：US09928866B2
公开(公告)日：2018-03-27
申请号：US13741144
申请日：2013-01-14
申请人： FUJI ELECTRIC CO., LTD.
发明人： Shinji Uchida
IPC分类号： C23C14/34 , G11B5/84 , G11B5/65 , G11B5/851 , C23C14/56
CPC分类号： G11B5/84 , C23C14/34 , C23C14/3414 , C23C14/3464 , C23C14/568 , G11B5/65 , G11B5/851
摘要： A method for manufacturing a magnetic recording medium includes reducing and eliminating impurity gas present in a chamber. A magnetic recording layer is formed and an active material layer is also formed immediately below or immediately above the magnetic recording layer in respective chambers. The active material layer is formed in the same chamber or with a gate opened between the magnetic recording layer chamber and the active material layer chamber.

9. 发明授权

US09672855B2 Perpendicular magnetic recording medium 有权
公开(公告)号：US09672855B2
公开(公告)日：2017-06-06
申请号：US14560708
申请日：2014-12-04
申请人： FUJI ELECTRIC CO., LTD.
发明人： Hiroyasu Kataoka , Hiroto Kikuchi , Akira Furuta , Shinji Uchida , Takehito Shimatsu
IPC分类号： G11B5/66 , G11B5/65
CPC分类号： G11B5/66 , G11B5/65 , G11B5/653
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.

10. 发明申请

US20160267934A1 MAGNETIC RECORDING MEDIUM 有权
标题翻译：磁记录介质
公开(公告)号：US20160267934A1
公开(公告)日：2016-09-15
申请号：US15033951
申请日：2015-08-10
申请人： Fuji Electric Co., Ltd.
发明人： Akira Furuta , Shinji Uchida , Tomohiro Moriya , Hitoshi Nakata , Takehito Shimatsu
IPC分类号： G11B5/65 , G11B5/73
CPC分类号： G11B5/65 , G11B5/732
摘要： 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 L1o 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.
摘要翻译：本发明的目的是提供一种磁记录介质，其包括具有更优异磁性的磁记录层，并包括L1o型有序合金。磁记录介质的一个结构示例包括基底，包含ZnO的第一籽晶层，包含MgO的第二籽晶层和包含有序合金的磁记录层。

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