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公开(公告)号：US20120225325A1
公开(公告)日：2012-09-06
申请号：US13372116
申请日：2012-02-13
申请人： HIROAKI NEMOTO , Ikuko TAKEKUMA , Kimio NAKAMURA , Junichi SAYAMA
发明人： HIROAKI NEMOTO , Ikuko TAKEKUMA , Kimio NAKAMURA , Junichi SAYAMA
CPC分类号： G11B5/653 , C22C5/04 , C22C38/002 , C22C2202/02 , G11B5/65 , G11B5/66
摘要： Surface flatness of magnetic recording medium to which a magnetic recording layer made of L10 FePt magnetic alloy thin film, with distance between a magnetic head and a magnetic recording medium sufficiently reduced. The magnetic recording layer includes: magnetic layers containing a magnetic alloy including Fe and Pt as principal materials; and one non-magnetic material selected from carbon, oxide and nitride. The first magnetic layer disposed closer to a substrate has a granular structure in which magnetic alloy grains including FePt alloy as the principal material are separated from grain boundaries including the non-magnetic material as the principal material. The second magnetic layer disposed closer to the surface than the first magnetic layer is fabricated so as to have a homogeneous structure in which an FePt alloy and the non-magnetic material are mixed in a state finer than diameters of the FePt magnetic alloy grains in the first magnetic layer.
摘要翻译： 由L10FePt磁性合金薄膜制成的磁记录层，磁头和磁记录介质之间的距离充分降低的磁记录介质的表面平整度。 磁记录层包括：含有以Fe和Pt为主要材料的磁性合金的磁性层; 和一种选自碳，氧化物和氮化物的非磁性材料。 靠近基板设置的第一磁性层具有以包含FePt合金作为主要材料的磁性合金颗粒与包括非磁性材料在内的晶界作为主要材料的颗粒结构。 制造比第一磁性层更靠近表面的第二磁性层，以具有均匀的结构，其中FePt合金和非磁性材料以比FePt磁性合金粒子的直径小的状态混合 第一磁性层。
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公开(公告)号：US20120214021A1
公开(公告)日：2012-08-23
申请号：US13364682
申请日：2012-02-02
申请人： Junichi Sayama , Ikuko Takekuma , Hiroaki Nemoto
发明人： Junichi Sayama , Ikuko Takekuma , Hiroaki Nemoto
IPC分类号： G11B5/65
CPC分类号： G11B5/65 , G11B5/7325
摘要： There is provided a magnetic recording medium including an MgO underlayer that can be formed by a mass production process and has a thickness of 3 nm or less as well as including a magnetic recording layer made of an L10-type FePt ordered alloy having excellent magnetic properties. A conductive compound having a crystal structure belonging to a cubic system is used as a material of an underlayer provided at the bottom of the MgO underlayer. The thickness of the MgO layer is 1 nm or more and 3 nm or less.
摘要翻译： 提供了一种包括MgO底层的磁记录介质，其可以通过批量生产工艺形成并具有3nm或更小的厚度，并且包括由具有优异磁性的L10型FePt有序合金制成的磁记录层 。 使用具有属于立方体系的晶体结构的导电化合物作为设置在MgO底层底部的底层的材料。 MgO层的厚度为1nm以上3nm以下。
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公开(公告)号：US07651795B2
公开(公告)日：2010-01-26
申请号：US11227675
申请日：2005-09-14
IPC分类号： G11B5/65
CPC分类号： G11B5/7325 , G11B5/65 , G11B5/656
摘要： Embodiments of the embodiment are directed to reducing the inter-granular exchange coupling of an oxide granular medium and obtaining a high media S/N value, resulting in an areal recording density greater than 23 gigabits per square centimeter or more being achieved. In one embodiment, a magnetic recording medium comprises a structure laminating a soft-magnetic underlayer, a lower intermediate layer including Ru, an upper intermediate layer consisting of Ru crystal grains and oxide crystal grain boundaries, a magnetic recording layer consisting of crystal grains and oxide crystal grain boundaries, in order, on a substrate, growing crystal grains of the magnetic recording layer epitaxially on the Ru crystal grains of the upper intermediate layer, and growing the crystal grain boundaries of the magnetic recording layer on the crystal grain boundaries of the upper intermediate layer.
摘要翻译： 实施例的实施例涉及减少氧化物颗粒介质的颗粒间交换耦合并获得高介质S / N值，导致实现大于23千兆比特/平方厘米或更大的面积记录密度。 在一个实施例中，磁记录介质包括层压软磁性底层，包含Ru的下中间层，由Ru晶粒和氧化物晶界组成的上中间层的结构，由晶粒和氧化物组成的磁记录层 晶粒边界依次在衬底上，外延地在上层中间层的Ru晶粒上生长磁记录层的晶粒，并且使上述记录层的晶界上的磁记录层的晶界生长 中间层。
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公开(公告)号：US07625644B2
公开(公告)日：2009-12-01
申请号：US11257978
申请日：2005-10-24
IPC分类号： G11B5/66
摘要： In a granular magnetic recording layer of a perpendicular magnetic recording medium, media noises are reduced by separating adequately magnetic crystal grains and non-magnetic grain boundary and decreasing magnetic exchange interactions among the magnetic crystal grains without causing damage to magnetic anisotropy of the magnetic crystal grains. In one embodiment, the perpendicular magnetic recording medium, in which crystal alloy grains containing Co, Pt, and Cr, and non-magnetic grain boundary containing Si and O is included; the ratio of the number of O atom to that of Si atom in the magnetic recording layer is between about 2.5 and 5; the Si atomic composition in the magnetic recording layer is between about 3 and 6 atomic %; and the O atomic composition in the magnetic recording layer is between about 12 and 20 atomic %, is used. The in-plane distribution of perpendicular coercivity at any points of the medium of the magnetic recording layer is made at most about ±10% of an average value.
摘要翻译： 在垂直磁记录介质的粒状磁记录层中，通过分离磁性晶粒和非磁性晶界以及降低磁晶粒之间的磁交换相互作用而不损害磁性晶粒的磁各向异性来降低介质噪声 。 在一个实施例中，包括含有Co，Pt和Cr的晶体合金晶粒和含有Si和O的非磁性晶界的垂直磁记录介质; 磁记录层中的O原子数与Si原子数的比例在约2.5和5之间; 磁记录层中的Si原子组成在约3和6原子％之间; 并且使用磁记录层中的O原子组成为约12至20原子％。 在磁记录层的介质的任何点处的垂直矫顽力的平面内分布最多为平均值的约±10％。
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5.发明申请公开(公告)号：US20090195924A1
公开(公告)日：2009-08-06
申请号：US12288654
申请日：2008-10-21
CPC分类号： G11B5/732 , G11B5/65 , G11B5/66 , G11B5/667 , G11B5/7325
摘要： Embodiments of the present invention help allow accurate control of the magnetization reversal in a magnetic recording layer in small reversal units, whereby high-density recording can be achieved. According to one embodiment, by forming an intermediate layer having a granular structure similar to that of the magnetic recording layer below the magnetic recording layer, a continuous crystal grain boundary is formed at the interface between the magnetic recording layer and the intermediate layer, thereby preventing incomplete formation of the crystal grain boundary found in the initial growth layer of the magnetic recording layer. The intermediate layer comprises a non-magnetic alloy comprising Co and Cr as its main components and an oxide such as Al, Cr, Hf. Mg, Nb, Si, Ta, Ti and Zr. Further, the average content of the oxygen element in the intermediate layer is in the range from 6 at % to 20 at %.
摘要翻译： 本发明的实施例有助于在小的反转单元中精确地控制磁记录层中的磁化反转，由此可以实现高密度记录。 根据一个实施例，通过在磁记录层下方形成具有类似于磁记录层的颗粒结构的中间层，在磁记录层和中间层之间的界面处形成连续的晶界，从而防止 在磁记录层的初始生长层中发现的晶界的不完全的形成。 中间层包括以Co和Cr为主要成分的非磁性合金和Al，Cr，Hf等氧化物。 Mg，Nb，Si，Ta，Ti和Zr。 此外，中间层中的氧元素的平均含量在6at％至20at％的范围内。
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6.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
申请人： Hiroaki Nemoto , Ikuko Takekuma , Yuzuru Hosoe
发明人： Hiroaki Nemoto , Ikuko Takekuma , Yuzuru Hosoe
IPC分类号： G11B5/667
CPC分类号： G11B5/82 , G11B5/1278 , G11B5/65
摘要： 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.
摘要翻译： 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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公开(公告)号：US20060088734A1
公开(公告)日：2006-04-27
申请号：US11243012
申请日：2005-10-03
申请人： Reiko Arai , Yoshiyuki Hirayama , Yuzuru Hosoe , Tomio Iwasaki , Yoko Ogawa , Ikuko Takekuma
发明人： Reiko Arai , Yoshiyuki Hirayama , Yuzuru Hosoe , Tomio Iwasaki , Yoko Ogawa , Ikuko Takekuma
摘要： Embodiments of the invention are directed to a medium which provides high media S/N and good corrosion resistance. According to one embodiment, in a perpendicular magnetic recording medium at least comprising a soft-magnetic underlayer, a seed layer, an intermediate layer, a magnetic recording layer and an overcoat layer which are stacked over a substrate in order, the magnetic recording layer has a granular structure which includes many columnar grains of CoCrPt alloy and a grain boundary layer containing an oxide, the seed layer is made of TaNi alloy or TaTi alloy and the intermediate layer is made of Ru or Ru alloy which contains 80 at. % Ru or more.
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公开(公告)号：US08709618B2
公开(公告)日：2014-04-29
申请号：US11726099
申请日：2007-03-20
IPC分类号： G11B5/66
CPC分类号： G11B5/66 , G11B5/11 , G11B5/1278 , G11B5/3116 , G11B5/3146 , G11B5/315 , G11B5/3967 , G11B5/656
摘要： According to embodiments of the present invention, a shielded pole writer and a perpendicular magnetic recording medium suitable thereto are combined to provide high medium SNR and excellent OW characteristic simultaneously. A perpendicular magnetic recording medium of a magnetic storage apparatus mounting a shielded pole writer, including a perpendicular magnetic recording medium having a recording layer of a three layered structure is used. A first recording layer has a granular structure consisting of grain boundaries containing an oxide and columnar grains comprising a CoCrPt alloy, in which a second recording layer and a third recording layer formed thereabove comprise Co as a main ingredient, contain Cr and do not contain an oxide, and the Cr concentration in the second recording layer is lower than the Cr concentration in the third recording layer.
摘要翻译： 根据本发明的实施例，组合屏蔽极写入器和适合于其的垂直磁记录介质，以同时提供高中等信噪比和优异的OW特性。 使用安装屏蔽极写入器的磁存储装置的垂直磁记录介质，其包括具有三层结构的记录层的垂直磁记录介质。 第一记录层具有由包含氧化物的晶界和包含CoCrPt合金的柱状晶粒构成的粒状结构，其中形成在其上的第二记录层和第三记录层包含Co作为主要成分，并且不含有 并且第二记录层中的Cr浓度低于第三记录层中的Cr浓度。
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9.发明授权公开(公告)号：US07701667B2
公开(公告)日：2010-04-20
申请号：US11651922
申请日：2007-01-09
IPC分类号： G11B5/66
摘要： Embodiments in accordance with the present invention provide a perpendicular recording medium with low noise and high recording density by reducing the effects from noise generated from the vicinity of the interface with the intermediate layer of the recording layer, in a perpendicular recording medium utilizing a granular recording layer containing oxygen or oxide additive in a cobalt-chromium alloy formed on an intermediate layer with a ruthenium or ruthenium alloy layer. A first recording layer and a second recording layer are formed in order on an intermediate layer of ruthenium or ruthenium alloy. The first recording layer and the second recording layer are comprised of cobalt as the main material in a granular structure containing chromium and oxygen. The saturation magnetization of the first recording layer is lower than the saturation magnetization of the second recording layer. When a first recording layer saturation magnetization is set as Ms1(emu per cubic centimeter), a second recording layer saturation magnetization is set as Ms2(emu per cubic centimeter), and the first recording layer film thickness is set to t1 (nm), then (Ms2−Ms1)×t1 will be larger than 0 (memu per square centimeter) and smaller than 0.15 (memu per square centimeter).
摘要翻译： 根据本发明的实施例通过减少在与记录层的中间层的界面附近产生的噪声的影响，在使用粒状记录的垂直记录介质中提供具有低噪声和高记录密度的垂直记录介质 在含有钌或钌合金层的中间层上形成的钴 - 铬合金中含有氧或氧化物添加剂的层。 在钌或钌合金的中间层上依次形成第一记录层和第二记录层。 第一记录层和第二记录层由包含铬和氧的颗粒结构中的钴作为主要材料组成。 第一记录层的饱和磁化强度低于第二记录层的饱和磁化强度。 当第一记录层的饱和磁化强度设定为Ms1（emu /立方厘米）时，第二记录层的饱和磁化强度设定为Ms2（emu /立方厘米），第一记录层膜厚设定为t1（nm） 那么（Ms2-Ms1）×t1将大于0（每平方厘米的记忆），小于0.15（每平方厘米的记忆）。
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10.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
CPC分类号： G11B5/7325 , G11B5/65 , G11B5/656
摘要： 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.
摘要翻译： 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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