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1.发明授权Perpendicular magnetic recording media and magnetic storage apparatus using the same 失效垂直磁记录介质及使用其的磁存储装置公开(公告)号：US06773826B2
公开(公告)日：2004-08-10
申请号：US10076420
申请日：2002-02-19
Applicant: Hiroyuki Nakagawa , Hiroaki Nemoto , Yuzuru Hosoe
Inventor： Hiroyuki Nakagawa , Hiroaki Nemoto , Yuzuru Hosoe
IPC: G11B564
CPC classification number: G11B5/667 , G11B5/7325 , Y10T428/12806 , Y10T428/12854 , Y10T428/12861 , Y10T428/12931 , Y10T428/265
Abstract: A perpendicular magnetic recording medium and a magnetic storage apparatus, which show an excellent S/N ratio and are suitable for ultra high density magnetic recording, are provided. In the perpendicular magnetic recording medium having a recording layer composed of at least two layers of a main recording layer formed above a substrate and a thermally-stabilizing layer formed on the main recording layer, the thermally-stabilizing layer being formed closer to a surface of the medium than the main recording layer, alloy containing Co and Cr as a main component, which shows a low noise property, is used as the main recording layer, amorphous alloy containing rare earth metals and 3d transition metals as a main component, which is excellent in thermal stability, is used as the thermally-stabilizing layer, and a cap layer formed of alloy containing Co and Cr as a main component is formed on a surface of the thermally-stabilizing layer.
Abstract translation: 提供了显示优异的S / N比并且适用于超高密度磁记录的垂直磁记录介质和磁存储装置。 在具有由形成在基板上形成的主记录层的至少两层和由主记录层形成的热稳定层构成的记录层的垂直磁记录介质中，形成为更靠近表面的热稳定层 使用显示低噪声特性的Co和Cr作为主要成分的合金作为主记录层，使用含有稀土金属和3d过渡金属作为主要成分的非晶态合金作为主记录层，其为 热稳定性优异，作为热稳定层的表面形成由Co和Cr作为主要成分的合金形成的盖层。
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2.发明申请公开(公告)号：US20050042367A1
公开(公告)日：2005-02-24
申请号：US10952735
申请日：2004-09-30
Applicant: Hiroaki Nemoto , Hiroyuki Nakagawa , Yuzuru Hosoe
Inventor： Hiroaki Nemoto , Hiroyuki Nakagawa , Yuzuru Hosoe
IPC: G11B5/00 , G11B5/64 , G11B5/66 , G11B5/673 , G11B5/738 , G11B5/84 , H01F10/16 , H01F41/32 , B05D3/00
CPC classification number: G11B5/84 , G11B5/656 , G11B5/66 , G11B2005/0029 , Y10T428/12646 , Y10T428/12875 , Y10T428/12931 , Y10T428/24975 , Y10T428/265
Abstract: A perpendicular magnetic recording medium, which has a low level of recording noise and sufficiently large perpendicular magnetic anisotropy energy relative to demagnetizing field energy, includes a substrate and a multi-layered magnetic film. The multi-layered magnetic film is composed of ferromagnetic metal layers of Co alloy containing at least Cr and non-magnetic metal layers of Pd alloy, each one layer of which are laminated alternately on top of one layer of the other. The ferromagnetic metal layers and the non-magnetic metal layers have a thickness of d1 and d2, respectively, with the ratio of d1/d2 being in the range of 1.5 to 4.0. This specific layer structure reduces the magnetic exchange interaction between magnetic particles in the multi-layered magnetic film. Therefore, the perpendicular magnetic recording medium is stable against thermal disturbance and has a low level of recording noise.
Abstract translation: 相对于去磁场能量，具有低水平的记录噪声和足够大的垂直磁各向异性能的垂直磁记录介质包括基底和多层磁性膜。 多层磁性膜由至少含有Cr的Co合金的铁磁性金属层和Pd合金的非磁性金属层构成，其中的每一层交替层叠在另一层之上。 强磁性金属层和非磁性金属层的厚度分别为d1和d2，d1 / d2的比例在1.5至4.0的范围内。 该特定的层结构减少了多层磁性膜中磁性颗粒之间的磁交换相互作用。 因此，垂直磁记录介质对于热干扰是稳定的并且具有低水平的记录噪声。
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公开(公告)号：US06815083B2
公开(公告)日：2004-11-09
申请号：US10217478
申请日：2002-08-14
Applicant: Hiroaki Nemoto , Hiroyuki Nakagawa , Yuzuru Hosoe
Inventor： Hiroaki Nemoto , Hiroyuki Nakagawa , Yuzuru Hosoe
IPC: G11B5673
CPC classification number: G11B5/84 , G11B5/656 , G11B5/66 , G11B2005/0029 , Y10T428/12646 , Y10T428/12875 , Y10T428/12931 , Y10T428/24975 , Y10T428/265
Abstract: A perpendicular magnetic recording medium, which has a low level of recording noise and sufficiently large perpendicular magnetic anisotropy energy relative to demagnetizing field energy, includes a substrate and a multi-layered magnetic film. The multi-layered magnetic film is composed of ferromagnetic metal layers of Co alloy containing at least Cr and non-magnetic metal layers of Pd alloy, each one layer of which are laminated alternately on top of one layer of the other. The ferromagnetic metal layers and the non-magnetic metal layers have a thickness of d1 and d2, respectively, with the ratio of d1/d2 being in the range of 1.5 to 4.0. This specific layer structure reduces the magnetic exchange interaction between magnetic particles in the multi-layered magnetic film. Therefore, the perpendicular magnetic recording medium is stable against thermal disturbance and has a low level of recording noise.
Abstract translation: 相对于去磁场能量，具有低水平的记录噪声和足够大的垂直磁各向异性能的垂直磁记录介质包括基底和多层磁性膜。 多层磁性膜由至少含有Cr的Co合金的铁磁性金属层和Pd合金的非磁性金属层构成，其中的每一层交替层叠在另一层之上。 强磁性金属层和非磁性金属层的厚度分别为d1和d2，d1 / d2的比例在1.5至4.0的范围内。 该特定的层结构减少了多层磁性膜中磁性颗粒之间的磁交换相互作用。 因此，垂直磁记录介质对于热干扰是稳定的并且具有低水平的记录噪声。
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4.发明授权公开(公告)号：US07457064B2
公开(公告)日：2008-11-25
申请号：US11715132
申请日：2007-03-06
Applicant: Hiroaki Nemoto , Ikuko Takekuma , Yuzuru Hosoe
Inventor： Hiroaki Nemoto , Ikuko Takekuma , Yuzuru Hosoe
IPC: G11B5/667
CPC classification number: G11B5/82 , G11B5/1278 , G11B5/65
Abstract: Embodiments in accordance with the present invention provide a perpendicular magnetic recording medium which is easy to record, offers superior thermal stability of recording magnetization, and allows high-density recording. In one embodiment, a perpendicular magnetic layer with controlled magnetic properties is used as a magnetic storage layer of a perpendicular magnetic recording medium, the magnetic properties having been controlled such that an indicator σhsw [%] of the dispersion of magnetization switching fields in the perpendicular magnetic layer and an indicator Dn [nm] of the intensity of exchange interactions, in film surface directions, in the perpendicular magnetic layer satisfy inequalities σhsw/27+Dn/90 20. The indicators can be measured using a magnetometer.
Abstract translation: 根据本发明的实施例提供了易于记录的垂直磁记录介质，提供了优异的记录磁化的热稳定性，并允许高密度记录。 在一个实施例中，使用具有受控磁特性的垂直磁性层作为垂直磁记录介质的磁存储层，其磁特性已经被控制，使得该磁性能的指标σ< 垂直磁性层中的磁化开关场的分散和膜的表面方向上的交换相互作用强度的指示器D N n [nm]满足不等式sigmah < / SUB + / 27 + D / 90 <1和D 20。 指标可以用磁力计测量。
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5.发明申请公开(公告)号：US20070217048A1
公开(公告)日：2007-09-20
申请号：US11715132
申请日：2007-03-06
Applicant: Hiroaki Nemoto , Ikuko Takekuma , Yuzuru Hosoe
Inventor： Hiroaki Nemoto , Ikuko Takekuma , Yuzuru Hosoe
CPC classification number: G11B5/82 , G11B5/1278 , G11B5/65
Abstract: Embodiments in accordance with the present invention provide a perpendicular magnetic recording medium which is easy to record, offers superior thermal stability of recording magnetization, and allows high-density recording. In one embodiment, a perpendicular magnetic layer with controlled magnetic properties is used as a magnetic storage layer of a perpendicular magnetic recording medium, the magnetic properties having been controlled such that an indicator σhsw [%] of the dispersion of magnetization switching fields in the perpendicular magnetic layer and an indicator Dn [nm] of the intensity of exchange interactions, in film surface directions, in the perpendicular magnetic layer satisfy inequalities σhsw/27+Dn/90 20. The indicators can be measured using a magnetometer.
Abstract translation: 根据本发明的实施例提供了易于记录的垂直磁记录介质，提供了优异的记录磁化的热稳定性，并允许高密度记录。 在一个实施例中，使用具有受控磁特性的垂直磁性层作为垂直磁记录介质的磁存储层，其磁特性已经被控制，使得该磁性性质的指示符σ< 垂直磁性层中的磁化开关场的分散和膜的表面方向上的交换相互作用强度的指示器D N n [nm]满足不等式sigmah < / SUB + / 27 + D / 90 <1和D 20。 指标可以用磁力计测量。
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Patent Agency Ranking
6.发明申请Granular recording medium for perpendicular recording and recording apparatus 审中-公开用于垂直记录和记录设备的颗粒记录介质公开(公告)号：US20070026260A1
公开(公告)日：2007-02-01
申请号：US11494154
申请日：2006-07-26
Applicant: Hiroaki Nemoto , Yuzuru Hosoe
Inventor： Hiroaki Nemoto , Yuzuru Hosoe
IPC: G11B5/66
CPC classification number: G11B5/7325 , G11B5/66
Abstract: A double-layer perpendicular magnetic recording medium suitable for high density recording is obtained. In one embodiment, a granular recording medium is formed on a undercoating layer, in which a first metal composed of Pt, Pd, or an alloy thereof and a second metal composed of Cr or V are included and their composition is 15%
Abstract translation: 获得适用于高密度记录的双层垂直磁记录介质。 在一个实施方案中，颗粒记录介质形成在底涂层上，其中包括由Pt，Pd或其合金组成的第一金属和由Cr或V组成的第二金属，并且它们的组成为15％
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7.发明申请Perpendicular magnetic recording medium having alternatively layered structure of Co alloy and Pt thin film, its production method and apparatus 审中-公开具有Co合金和Pt薄膜的层叠结构的垂直磁记录介质，其制造方法和装置公开(公告)号：US20050142378A1
公开(公告)日：2005-06-30
申请号：US11012835
申请日：2004-12-14
Applicant: Hiroaki Nemoto , Yuzuru Hosoe , Yoshiyuki Hirayama , Mineaki Kodama
Inventor： Hiroaki Nemoto , Yuzuru Hosoe , Yoshiyuki Hirayama , Mineaki Kodama
CPC classification number: G11B5/65 , G11B5/851 , Y10T428/12875
Abstract: Embodiments of the invention provide a granular medium structure and a significant increase of the Ku value of a magnetic material at the same time using a non-metal material, thereby obtaining a magnetic recording medium capable of high density recording. In one embodiment, a magnetic metal grain in a granular magnetic film made of magnetic metal grains and a non-magnetic material is obtained by laminating a ferromagnetic exchange metallic element that contains mainly Co or Fe and a Pt element alternately and the lamination period is set between about 0.35 nm and 0.9 nm, preferably between about 0.4 nm and 0.55 nm.
Abstract translation: 本发明的实施例使用非金属材料同时提供磁性材料的粒状介质结构和显着提高磁性材料的K值，由此获得能够高密度的磁记录介质 记录。 在一个实施例中，由磁性金属颗粒和非磁性材料制成的颗粒状磁性膜中的磁性金属颗粒通过层叠主要包含Co或Fe和Pt元素的铁磁性交换金属元素交替地获得，并且设置层压周期 在约0.35nm和0.9nm之间，优选在约0.4nm和0.55nm之间。
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8.发明授权Perpendicular magnetic recording media and magnetic storage apparatus using the same 有权垂直磁记录介质及使用其的磁存储装置公开(公告)号：US07368185B2
公开(公告)日：2008-05-06
申请号：US10977552
申请日：2004-10-29
Applicant: Yoshiyuki Hirayama , Yuzuru Hosoe , Hiroyuki Nakagawa , Ikuko Takekuma
Inventor： Yoshiyuki Hirayama , Yuzuru Hosoe , Hiroyuki Nakagawa , Ikuko Takekuma
CPC classification number: G11B5/7325 , G11B5/65 , G11B5/656
Abstract: Embodiments of the invention provide a perpendicular magnetic recording medium that not only attains the magnetic isolation of crystal grains in a magnetic recording layer from one another in a region of the medium in which the thickness of an intermediate layer is equal to or smaller than about 20 nm but also exhibits excellent crystallographic texture and that exhibits small medium noise, excellent thermal stability, and high write-ability. In one embodiment, a perpendicular magnetic recording medium has at least a soft-magnetic underlayer, a first intermediate layer, a second intermediate layer, a third intermediate layer, and a magnetic recording layer successively formed on a substrate. The magnetic recording layer is composed of ferromagnetic crystal grains and oxides or nitrides, the third intermediate layer is composed of Ru or an Ru alloy, the second intermediate layer is composed of a metal or an alloy having the face-centered cubic lattice structure, and the first intermediate layer is composed of a metal or an alloy having the hexagonal close-packed structure.
Abstract translation: 本发明的实施例提供了一种垂直磁记录介质，其不仅在中间层的厚度等于或小于约20的介质的区域中彼此之间实现磁记录层中的晶粒的磁隔离 nm，但也具有优异的晶体学结构，表现出中等的中等噪声，优异的热稳定性和高的写入能力。 在一个实施例中，垂直磁记录介质至少具有在基板上依次形成的软磁性底层，第一中间层，第二中间层，第三中间层和磁记录层。 磁记录层由铁磁性晶粒和氧化物或氮化物构成，第三中间层由Ru或Ru合金构成，第二中间层由具有面心立方晶格结构的金属或合金构成， 第一中间层由具有六方密堆积结构的金属或合金构成。
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9.发明申请Perpendicular magnetic recording media and magnetic storage apparatus using the same 有权垂直磁记录介质及使用其的磁存储装置公开(公告)号：US20050142388A1
公开(公告)日：2005-06-30
申请号：US10977552
申请日：2004-10-29
Applicant: Yoshiyuki Hirayama , Yuzuru Hosoe , Hiroyuki Nakagawa , Ikuko Takekuma
Inventor： Yoshiyuki Hirayama , Yuzuru Hosoe , Hiroyuki Nakagawa , Ikuko Takekuma
CPC classification number: G11B5/7325 , G11B5/65 , G11B5/656
Abstract: Embodiments of the invention provide a perpendicular magnetic recording medium that not only attains the magnetic isolation of crystal grains in a magnetic recording layer from one another in a region of the medium in which the thickness of an intermediate layer is equal to or smaller than about 20 nm but also exhibits excellent crystallographic texture and that exhibits small medium noise, excellent thermal stability, and high write-ability. In one embodiment, a perpendicular magnetic recording medium has at least a soft-magnetic underlayer, a first intermediate layer, a second intermediate layer, a third intermediate layer, and a magnetic recording layer successively formed on a substrate. The magnetic recording layer is composed of ferromagnetic crystal grains and oxides or nitrides, the third intermediate layer is composed of Ru or an Ru alloy, the second intermediate layer is composed of a metal or an alloy having the face-centered cubic lattice structure, and the first intermediate layer is composed of a metal or an alloy having the hexagonal close-packed structure.
Abstract translation: 本发明的实施例提供了一种垂直磁记录介质，其不仅在中间层的厚度等于或小于约20的介质的区域中彼此之间实现磁记录层中的晶粒的磁隔离 nm，但也具有优异的晶体学结构，表现出中等的中等噪声，优异的热稳定性和高的写入能力。 在一个实施例中，垂直磁记录介质至少具有在基板上依次形成的软磁性底层，第一中间层，第二中间层，第三中间层和磁记录层。 磁记录层由铁磁性晶粒和氧化物或氮化物构成，第三中间层由Ru或Ru合金构成，第二中间层由具有面心立方晶格结构的金属或合金构成， 第一中间层由具有六方密堆积结构的金属或合金构成。
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公开(公告)号：US20080182134A1
公开(公告)日：2008-07-31
申请号：US12079701
申请日：2008-03-27
Applicant: Yoshiyuki Hirayama , Yuzuru Hosoe , Hiroyuki Nakagawa , Ikuko Takekuma
Inventor： Yoshiyuki Hirayama , Yuzuru Hosoe , Hiroyuki Nakagawa , Ikuko Takekuma
IPC: G11B5/66
CPC classification number: G11B5/7325 , G11B5/65 , G11B5/656
Abstract: Embodiments of the invention provide a perpendicular magnetic recording medium that not only attains the magnetic isolation of crystal grains in a magnetic recording layer from one another in a region of the medium in which the thickness of an intermediate layer is equal to or smaller than about 20 nm but also exhibits excellent crystallographic texture and that exhibits small medium noise, excellent thermal stability, and high write-ability. In one embodiment, a perpendicular magnetic recording medium has at least a soft-magnetic underlayer, a first intermediate layer, a second intermediate layer, a third intermediate layer, and a magnetic recording layer successively formed on a substrate. The magnetic recording layer is composed of ferromagnetic crystal grains and oxides or nitrides, the third intermediate layer is composed of Ru or an Ru alloy, the second intermediate layer is composed of a metal or an alloy having the face-centered cubic lattice structure, and the first intermediate layer is composed of a metal or an alloy having the hexagonal close-packed structure.
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