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11.发明授权公开(公告)号：US08252152B2
公开(公告)日：2012-08-28
申请号：US12245317
申请日：2008-10-03
IPC分类号： C23C14/34
摘要： The quantity of oxide contained in a magnetic layer is controlled to control the crystal grains and the segregation structure for ensuring low noise characteristic in a granular magnetic layer of a perpendicular magnetic recording medium. The granular magnetic layer consists of ferromagnetic crystal grains and a nonmagnetic grain boundary region mainly of an oxide surrounding the ferromagnetic crystal grains. The perpendicular magnetic recording medium has a nonmagnetic underlayer composed of a metal or alloy having hexagonal closest-packed crystal structure. The ferromagnetic crystal grain is composed of an alloy containing at least cobalt and platinum. The volume proportion of the nonmagnetic grain boundary region mainly of the oxide falls within a range of 15% to 40% of the volume of the total magnetic layer.
摘要翻译： 控制包含在磁性层中的氧化物的量以控制晶粒和隔离结构，以确保垂直磁记录介质的粒状磁性层中的低噪声特性。 粒状磁性层由铁磁晶粒和主要由铁磁晶粒周围的氧化物构成的非磁性晶界区域构成。 垂直磁记录介质具有由具有六方最密堆积晶体结构的金属或合金构成的非磁性底层。 铁磁晶粒由至少含有钴和铂的合金构成。 主要是氧化物的非磁性晶界区域的体积比例落在总磁性层的体积的15〜40％的范围内。
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公开(公告)号：US20080138524A1
公开(公告)日：2008-06-12
申请号：US11763789
申请日：2007-06-15
IPC分类号： B05D3/04
CPC分类号： G11B5/667 , G11B5/8404
摘要： A manufacturing method for a magnetic recording medium is disclosed. By using the method, the anisotropic magnetic field (Hk) of an underlayer is improved, spike noise generated in the soft magnetic underlayer is suppressed, and the signal-to-noise ratio (SNR) is improved without employing a special layer configuration and without the need for complicated and expensive processing. A soft magnetic underlayer is formed by laminating a soft magnetic lower underlayer, a non-magnetic metal layer, and a soft magnetic upper underlayer in succession on a non-magnetic substrate. After forming the non-magnetic metal layer, its surface is exposed to a gas containing between 2 and 100 at % oxygen. A perpendicular magnetic recording layer is formed on the soft magnetic underlayer.
摘要翻译： 公开了一种用于磁记录介质的制造方法。 通过使用该方法，改善了底层的各向异性磁场（Hk），抑制了在软磁性底层中产生的尖峰噪声，并且在不采用特殊层构造的情况下提高了信噪比（SNR），而没有 需要复杂而昂贵的处理。 在非磁性基板上依次层叠软磁性下层，非磁性金属层和软磁性上层，形成软磁性底层。 在形成非磁性金属层之后，其表面暴露于含有2至100at％氧气的气体。 在软磁性底层上形成垂直磁记录层。
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公开(公告)号：US06994924B2
公开(公告)日：2006-02-07
申请号：US10273364
申请日：2002-10-18
CPC分类号： G11B5/732 , G11B5/65 , G11B5/7325
摘要： A magnetic recording medium and a manufacturing method therefore includes a protective film, a nonmagnetic substrate, a nonmagnetic base layer, a nonmagnetic intermediate layer, a magnetic layer, and a liquid lubricant layer. The nonmagnetic base layer has a body-centered cubic structure and a (200) plane including a crystal-orientation parallel with a surface of the protective film. The nonmagnetic intermediate layer has a hexagonal close-packed structure and a (110) plane including a crystal-orientation parallel with the surface of the protective film. The magnetic layer has a granular structure including hexagonal close-packed ferromagnetic crystal grains and oxide-based nonmagnetic grain boundaries surrounding the ferromagnetic crystal grains. The nonmagnetic base layer, the nonmagnetic intermediate layer, the magnetic layer, the protective film, and the liquid lubricant layer are sequentially stacked on the nonmagnetic substrate.
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公开(公告)号：US20050181237A1
公开(公告)日：2005-08-18
申请号：US11032691
申请日：2005-01-10
申请人： Osamu Kitakami , Yutaka Shimada , Satoshi Okamoto , Takehito Shimatsu , Hajime Aoi , Hiroaki Muraoka , Yoshihisa Nakamura , Hiroyuki Uwazumi , Tadaaki Oikawa
发明人： Osamu Kitakami , Yutaka Shimada , Satoshi Okamoto , Takehito Shimatsu , Hajime Aoi , Hiroaki Muraoka , Yoshihisa Nakamura , Hiroyuki Uwazumi , Tadaaki Oikawa
摘要： There is provided a perpendicular magnetic recording medium according to which both the thermal stability of the magnetization is good and writing with a magnetic head is easy, and moreover the SNR is improved. In the case of a perpendicular magnetic recording medium comprising a nonmagnetic substratel, and at least a nonmagnetic underlayer 2, a magnetic recording layer 3 and a protective layer 4 formed in this order on the nonmagnetic substrate 1, the magnetic recording layer 3 comprises a low Ku region 31 layer having a perpendicular magnetic anisotropy constant (Ku value) of not more than 1×105 erg/cm3, and a high Ku region 32 layer having a Ku value of at least 1×106 erg/cm3. Moreover, the magnetic recording layer 3 is made to have therein nonmagnetic grain boundaries that contain a nonmagnetic oxide and magnetically isolate crystal grains, which are made of a ferromagnetic metal, from one another.
摘要翻译： 提供了一种垂直磁记录介质，根据该磁记录介质，磁化的热稳定性都很好，并且用磁头进行写入容易，此外SNR提高。 在包括非磁性基底层的至少一个非磁性底层2，磁记录层3和保护层4的垂直磁记录介质的情况下，磁记录层3包括低磁性层 具有不大于1×10 5 erg / cm 3的垂直磁各向异性常数（K u值）的K u区域31层 和具有至少1×10 6个/ cm 2以上的K值的高K区域32层， 3 。 此外，使磁记录层3具有包含非磁性氧化物的非磁性晶界，并且将由铁磁性金属制成的晶粒彼此磁分离。
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15.发明授权公开(公告)号：US06767651B2
公开(公告)日：2004-07-27
申请号：US10037475
申请日：2002-01-03
IPC分类号： G11B5738
CPC分类号： G11B5/7325 , Y10T428/1259 , Y10T428/12611 , Y10T428/12847 , Y10T428/12854
摘要： In a magnetic recording medium, a plurality of non-magnetic metallic intermediate layers is laminated between an under-layer and a magnetic layer. One of the intermediate layers is composed of at least an element selected from the group consisting of Ru, Re and Os and contains oxygen, and another is composed of a CoCr alloy containing at least an element selected from the group consisting of Nb, Mo, Ru, Rh, Pd, Ta, W, Re Os, Ir and Pt. The resulting magnetic recording medium provides reduced costs and improved recording characteristics.
摘要翻译： 在磁记录介质中，在下层和磁性层之间层叠多个非磁性金属中间层。 中间层中的一个由至少一种选自Ru，Re和Os的元素组成并含有氧，另一个由含有至少一种选自Nb，Mo， Ru，Rh，Pd，Ta，W，Re Os，Ir和Pt。 所得到的磁记录介质提供降低的成本和改进的记录特性。
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16.再颁专利公开(公告)号：USRE41282E1
公开(公告)日：2010-04-27
申请号：US11945854
申请日：2007-11-27
CPC分类号： G11B5/732 , G11B5/7325 , G11B5/851
摘要： A perpendicular magnetic recording medium has a granular magnetic layer and a nonmagnetic underlayer of a metal or an alloy having a hexagonal close packed (hcp) crystal structure. A seed layer of a metal or an alloy of a face-centered cubic (fcc) crystal structure is provided under the nonmagnetic underlayer. Such a perpendicular magnetic recording medium exhibits excellent magnetic characteristics even when the thickness of the underlayer or the total thickness of the underlayer and the seed layer is very thin. Excellent magnetic characteristics can be obtained even when of the substrate is not preheated. Accordingly, a nonmagnetic substrate, such as a plastic resin can be employed to reduce the manufacturing cost.
摘要翻译： 垂直磁记录介质具有颗粒磁性层和具有六方密堆积（hcp）晶体结构的金属或合金的非磁性底层。 在非磁性底层下方设置面心立方（fcc）晶体结构的金属种子层或合金。 即使当底层的厚度或底层和种子层的总厚度非常薄时，这种垂直磁记录介质也表现出优异的磁特性。 即使在未预热基板的情况下也能获得良好的磁特性。 因此，可以采用塑料树脂等非磁性基板来降低制造成本。
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公开(公告)号：US06716542B2
公开(公告)日：2004-04-06
申请号：US09789928
申请日：2001-02-22
申请人： Hiroyuki Uwazumi , Tadaaki Oikawa
发明人： Hiroyuki Uwazumi , Tadaaki Oikawa
IPC分类号： G11B565
CPC分类号： G11B5/851 , C22C5/04 , C23C14/0688 , C23C14/3414 , Y10T428/25 , Y10T428/252 , Y10T428/256 , Y10T428/259
摘要： The present invention provides a sputtering target for production of a magnetic recording medium including at least a nonmagnetic undercoat layer, a magnetic layer, and a protective layer laminated sequentially on a nonmagnetic substrate, the sputtering target being used for film formation of the magnetic layer, the sputtering target comprising a mixture of a metal and an oxide, and the particle diameter of the oxide in the sputtering target being 10 &mgr;m or less. The sputtering target suppresses abnormal discharge occurring during film formation of a granular magnetic layer of the magnetic recording medium, and suppresses occurrence of foreign objects on the magnetic recording medium.
摘要翻译： 本发明提供一种用于生产至少包括非磁性底涂层，磁性层和保护层的磁记录介质的溅射靶，其顺序地层合在非磁性基底上，溅射靶用于磁性层的成膜， 溅射靶包括金属和氧化物的混合物，溅射靶中的氧化物的粒径为10μm以下。 溅射靶抑制在磁记录介质的粒状磁性层的成膜期间发生的异常放电，并且抑制在磁记录介质上产生异物。
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公开(公告)号：US08039133B2
公开(公告)日：2011-10-18
申请号：US11114578
申请日：2005-04-26
IPC分类号： G11B5/66
CPC分类号： G11B5/656 , G11B5/712 , G11B5/851 , Y10S428/90 , Y10T428/12465
摘要： A magnetic recording medium, and method of manufacturing the same, is provided with excellent recording performance by employing a granular magnetic layer having a specified composition. A magnetic recording medium according to the present invention comprises a nonmagnetic underlayer, a granular magnetic layer, a protective film, and a liquid lubrication layer sequentially laminated on a nonmagnetic substrate. The granular magnetic layer consists of ferromagnetic crystal grains containing cobalt and nonmagnetic grain boundary region surrounding the ferromagnetic crystal grains. The ferromagnetic crystal grains contain platinum in the range of 15 at % to 17 at %.
摘要翻译： 磁记录介质及其制造方法通过采用具有特定组成的粒状磁性层而具有良好的记录性能。 根据本发明的磁记录介质包括顺序层压在非磁性基底上的非磁性底层，粒状磁性层，保护膜和液体润滑层。 颗粒状磁性层由铁磁性晶粒构成，包含铁磁性晶粒周围的钴和非磁性晶界。 铁磁晶粒含有15原子％至17原子％的铂。
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19.发明授权公开(公告)号：US08034470B2
公开(公告)日：2011-10-11
申请号：US12048253
申请日：2008-03-14
申请人： Tadaaki Oikawa , Hiroyuki Uwazumi
发明人： Tadaaki Oikawa , Hiroyuki Uwazumi
CPC分类号： G11B5/66 , C23C14/16 , G11B5/65 , G11B5/851 , G11C11/14 , H01F10/16 , H01F10/265 , H01F41/18
摘要： A perpendicular magnetic recording medium is disclosed in which a soft magnetic layer used as a low Ku layer can be stably produced with high performance. Thermal stabilization of magnetization, ease of writing by a magnetic head, and SNR also are improved. A method of manufacturing the medium is disclosed. The perpendicular magnetic recording medium includes at least a nonmagnetic underlayer, a magnetic recording layer, and a protective layer formed in this order on a nonmagnetic substrate. The magnetic recording layer includes a low Ku layer having a relatively small perpendicular magnetic anisotropy constant (Ku value), and a high Ku layer in which the Ku value is relatively large, and the low Ku layer includes a soft magnetic thin film including an iron group element-based microcrystal structure, in which a nitrogen element is added to a ferromagnetic material mainly containing one of metals of Co, Ni and Fe or an alloy of the metal. The thin film has a crystal structure of a face-centered cubic lattice or hexagonal close packed, and a preferred crystal orientation plane parallel to a plane of the film is a (111) plane in the face-centered cubic lattice structure, and a (002) plane in the hexagonal close packed structure.
摘要翻译： 公开了一种垂直磁记录介质，其中可以以高性能稳定地制造用作低Ku层的软磁性层。 磁化的热稳定性，通过磁头的写入容易性和SNR也得到改善。 公开了一种制造该介质的方法。 垂直磁记录介质至少包括在非磁性基底上依次形成的非磁性底层，磁记录层和保护层。 磁记录层包括具有相对小的垂直磁各向异性常数（Ku值）的低Ku层和Ku值相对较大的高Ku层，低Ku层包括含有铁的软磁性薄膜 基于元素的微晶体结构，其中将氮元素添加到主要包含Co，Ni和Fe的金属或金属的合金中的一种的铁磁材料。 薄膜具有面心立方晶格或六方密堆积的晶体结构，并且平行于薄膜平面的优选晶体取向平面是面心立方晶格结构中的（111）面，并且（ 002）平面在六边形密堆积结构中。
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20.发明授权公开(公告)号：US07247395B2
公开(公告)日：2007-07-24
申请号：US10319842
申请日：2002-12-16
CPC分类号： G11B5/7325 , G11B5/65
摘要： A magnetic recording medium exhibiting low noise and having a sufficiently high coercive force includes a magnetic layer having a granular structure including ferromagnetic crystal grains with a hexagonal closed packed structure and a nonmagnetic grain boundary region of mainly an oxide intervening between the crystal grains. An underlayer has a body-centered cubic lattice structure. A nonmagnetic intermediate layer with the hexagonal closest packed structure includes Ru, Os, and/or Re, which are provided between the magnetic layer and the underlayer. A degree of mismatching Δ=|d1−d2|/d1 is at most 10%, for instance, in a range from 2.5% to 7.0%, where d1 is a spacing of lattice planes of the crystal grains in the magnetic layer and d2 is a spacing of the lattice planes of the crystal grains in the intermediate layer. A proportion of the crystal grains with a grain size of equal or greater than 8 nm are at most 10% of the crystal grains included in the intermediate layer and a standard deviation of the grain size is at most 1.4 nm. The layers are deposited without preheating the substrate.
摘要翻译： 表现出低噪声并且具有足够高的矫顽力的磁记录介质包括具有包括具有六方密闭堆积结构的铁磁晶粒和主要是介于晶粒之间的氧化物的非磁性晶界区域的颗粒结构的磁性层。 底层具有体心立方晶格结构。 具有六方最密堆积结构的非磁性中间层包括设置在磁性层和底层之间的Ru，Os和/或Re。 Δ不一致的程度达到= 10％以下，例如在 2.5％至7.0％，其中d 1是磁性层中晶粒的晶格间距，d 2是晶体的晶格面间距 中间层的晶粒。 晶粒尺寸等于或大于8nm的晶粒的比例至多为包含在中间层中的晶粒的10％，并且晶粒尺寸的标准偏差为至多1.4nm。 在不预热基底的情况下沉积这些层。
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