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1.发明授权Magnetic recording medium containing a Cr(HfO.sub.2) or Cr(ZrO.sub.2) 失效含有Cr（HfO 2）或Cr（ZrO 2）的磁记录介质
公开(公告)号：US6139950A
公开(公告)日：2000-10-31
申请号：US160580
申请日：1998-09-25
申请人： Zhong Wu , Rajiv Y. Ranjan
发明人： Zhong Wu , Rajiv Y. Ranjan
CPC分类号： G11B5/7325 , Y10S428/90 , Y10T428/26 , Y10T428/265
摘要： The Hr and SNR of a magnetic recording medium are increased by employing an underlayer containing Cr or a Cr alloy with HfO.sub.2 or ZrO.sub.2 dispersed therein. Embodiments include a composite underlayer comprising a first Cr or Cr alloy underlayer containing about 0.1 to about 20 at. % dispersed HfO.sub.2 or ZrO.sub.2 and a second underlayer comprising Cr or a Cr alloy, e.g. CrV, thereon.
摘要翻译： 通过使用含有分散有HfO 2或ZrO 2的Cr或Cr合金的底层来增加磁记录介质的Hr和SNR。 实施方案包括复合底层，其包含含有约0.1至约20at的第一Cr或Cr合金底层。 ％的分散的HfO 2或ZrO 2以及包含Cr或Cr合金的第二底层。 CrV，其上。
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公开(公告)号：US6132863A
公开(公告)日：2000-10-17
申请号：US161427
申请日：1998-09-24
申请人： Xing Song , Qixu Chen , Charles Leu , Rajiv Y. Ranjan
发明人： Xing Song , Qixu Chen , Charles Leu , Rajiv Y. Ranjan
CPC分类号： G11B5/7325 , Y10S428/90 , Y10T428/26 , Y10T428/265
摘要： Simultaneous crystallographic orientation and grain size refinement of the magnetic layer are achieved by depositing a grain size control layer on a underlayer. Embodiments include depositing a CrV grain size control layer on a Cr underlayer at thickness ratio of underlayer to grain size control layer of about 0.5 to about 2. Magnetic layers having a grain size of about 100 .ANG. to about 250 .ANG., e.g. at 180 .ANG. to about 220 .ANG., are achieved.
摘要翻译： 通过在底层上沉积晶粒尺寸控制层来实现磁性层的同时晶体取向和晶粒尺寸细化。 实施方案包括将CrV晶粒尺寸控制层沉积在Cr底层上，其底层与晶粒尺寸控制层的厚度比为约0.5至约2.具有约100至约250范围内的晶粒尺寸的磁性层。 在180 ANGSTROM到约220 ANGSTROM。
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3.发明授权Method of sputtering a carbon protective film on a magnetic disk by superimposing an AC voltage on a DC bias voltage 失效通过将AC电压叠加在DC偏置电压上来将碳保护膜溅射在磁盘上的方法
公开(公告)号：US5507930A
公开(公告)日：1996-04-16
申请号：US299852
申请日：1994-09-01
CPC分类号： C23C14/35 , C23C14/0605 , G11B5/722 , G11B5/8408
摘要： A carbon film for protecting a magnetic disk is sputtered by a DC magnetron sputtering method, with the addition of superimposed AC power on the DC power applied to the carbon target. When the carbon film is sputtered for extended period in a production sputtering machine, nodular growth occurs over the sputtering surface of the carbon target. Such nodules are variously called "warts" or "mushrooms" in the industry and they are detrimental to the productivity of the sputtering machine. The size and quantity of the nodules over the target surface increase as the target is sputtered longer, and because these region do not contribute to sputtering, the efficiency of the target decreases. As sputter efficiency decreases, power input must be increased to the target to make up for the loss in the effective sputtering area of the target. Eventually, the power input must be increased to a point where arcing occurs continuously and sputtering cannot be continued. By superimposing AC power onto the DC power applied to the target, virtually all arcing on the carbon target is eliminated, thereby significantly reducing the nodular growth and extending the use of the target.
摘要翻译： 通过直流磁控溅射法溅射用于保护磁盘的碳膜，对施加到碳靶的DC电力加上叠加的AC电力。 当碳膜在生产溅射机中长时间溅射时，在碳靶的溅射表面上发生结核生长。 这种结节在工业中被称为“疣”或“蘑菇”，并且它们不利于溅射机的生产率。 目标表面上的结节的大小和数量随着靶溅射时间的延长而增加，并且由于这些区域对溅射没有贡献，因此靶的效率降低。 随着溅射效率的降低，必须将功率输入增加到目标，以弥补目标有效溅射区域的损耗。 最终，电源输入必须增加到连续发生电弧的点，溅射不能继续。 通过将AC电力叠加到施加到目标的DC电力上，实际上消除了碳靶上的所有电弧，从而显着降低了结节生长并延长了靶的使用。
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公开(公告)号：US5062021A
公开(公告)日：1991-10-29
申请号：US491586
申请日：1990-03-12
申请人： Rajiv Y. Ranjan , David N. Lambeth
发明人： Rajiv Y. Ranjan , David N. Lambeth
CPC分类号： G11B23/505 , G11B5/6005 , G11B5/6082 , G11B5/82 , G11B5/84 , G11B5/8404 , Y10S428/90 , Y10S428/928 , Y10T428/12243 , Y10T428/12472 , Y10T428/1275 , Y10T428/12993
摘要： Magnetic recording media are controllably textured, particularly over areas designated for contact with data transducing heads. In connection with rigid media, the process includes polishing an aluminum nickel-phosphorous substrate to a specular finish, then rotating the disc while directing pulsed laser energy over a limited portion of the radius, thus forming an annular head contact band while leaving the remainder of the surface specular. The band is formed of multiple individual laser spots, each with a center depression surrounded by a substantially circular raised rim. The depth of the depressions and height of the rims are controlled primarily by laser power and firing pulse duration. The shape of individual laser spots can be altered by varying the laser beam inclination relative to the disc surface. On a larger scale, the frequency of firing the laser in combination with disc rotational speed controls the pattern or arrangement of laser spots. The smooth, rounded contours of the depressions and surrounding rims, as compared to the acicular character of mechanically textured surfaces, is a primary factor contributing to substantially increased durability of laser textured media.
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公开(公告)号：US07060376B1
公开(公告)日：2006-06-13
申请号：US10142155
申请日：2002-05-10
申请人： Chung-Hee Chang , Rajiv Y. Ranjan
发明人： Chung-Hee Chang , Rajiv Y. Ranjan
CPC分类号： G11B5/667 , G11B5/82 , G11B2005/0029
摘要： A perpendicular magnetic recording medium having a substrate, an amorphous soft underlayer and a magnetic layer for perpendicular recording has reduced DC noise and surface roughness, which reduces the head-to-media spacing and the head-to-amorphous soft underlayer spacing.
摘要翻译： 具有基板，非晶软底层和用于垂直记录的磁性层的垂直磁记录介质降低了DC噪声和表面粗糙度，从而降低了头对媒体间距和头对非软的软下层间距。
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6.发明授权Substantially two dimensional isotropic magnetic recording medium comprising a NiAl underlayer 有权基本二维各向同性磁记录介质，其包括NiAl底层
公开(公告)号：US6110582A
公开(公告)日：2000-08-29
申请号：US149096
申请日：1998-09-08
申请人： Zhong Wu , Rajiv Y. Ranjan
发明人： Zhong Wu , Rajiv Y. Ranjan
CPC分类号： G11B5/7325 , G11B5/8404 , Y10S428/90 , Y10T428/26 , Y10T428/265
摘要： A high areal density magnetic recording medium exhibiting high H.sub.c, high SNR, high S* and substantially two dimensionally isotropic magnetic properties is achieved by depositing a NiAl underlayer on a NiP-plated non-magnetic metallic substrate, such as an Al alloy substrate. Embodiments include depositing a Cr layer on the NiAl underlayer. The NiAl underlayer and/or Cr layer can optionally contain an alloying element for inducing a preferred HCP crystallographic structure in the magnetic layer by lattice matching.
摘要翻译： 通过在诸如Al合金基底的NiP镀非磁性金属基底上沉积NiAl底层，实现了表现出高Hc，高SNR，高S *和基本二维各向同性磁性能的高密度磁记录介质。 实施例包括在NiAl底层上沉积Cr层。 NiAl底层和/或Cr层可以任选地含有用于通过晶格匹配在磁性层中诱导优选HCP晶体结构的合金元素。
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7.发明授权
公开(公告)号：US5631094A
公开(公告)日：1997-05-20
申请号：US348547
申请日：1994-12-01
CPC分类号： G11B5/656 , Y10S428/90 , Y10S428/928 , Y10T428/12465 , Y10T428/12861 , Y10T428/31678
摘要： A new magnetic alloy exhibits high Hc and Ms while exhibiting excellent corrosion resistance, thereby providing ideal physical properties for high density recording applications. Other parameters of the media, such as SNR, PW50, and S are at least maintained, if not also improved. The alloy contains cobalt and up to 10 at. % Ni, up to 20 at. % Pt, up to 10 at. % Ta, up to 10 at. % Ti, and optionally up to 6 at. % B. The ratio of the tantalum to titanium in the alloy is between 3:1 and 1:3. The alloy is deposited by vacuum deposition (typically sputtering) on a similarly deposited non-magnetic Ni alloy under layer. Nitrogen and/or oxygen may be introduced into the alloy during deposition to improve SNR. Other corrosion-resistant thin film alloys may also be obtained by the inclusion of Ta and Ti.
摘要翻译： 新的磁性合金表现出高Hc和Ms，同时具有优异的耐腐蚀性，从而为高密度记录应用提供了理想的物理性能。 至少保持介质的其他参数，如SNR，PW50和S，如果不能改善。 该合金含有钴，最多可达10英寸。 ％Ni，最多20盎司。 ％Pt，最多10个。 ％Ta，高达10 at。 ％Ti，任选至多6at。 ％B。合金中钽与钛的比例为3：1至1：3。 通过真空沉积（通常是溅射）将合金沉积在类似地沉积的非磁性Ni合金层下。 可以在沉积期间将氮和/或氧引入合金以提高SNR。 也可以通过包含Ta和Ti来获得其它耐腐蚀的薄膜合金。
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8.发明授权
公开(公告)号：US5108781A
公开(公告)日：1992-04-28
申请号：US675334
申请日：1991-03-26
申请人： Rajiv Y. Ranjan , David N. Lambeth
发明人： Rajiv Y. Ranjan , David N. Lambeth
CPC分类号： G11B23/505 , G11B5/00 , G11B5/6005 , G11B5/82 , G11B5/84 , G11B5/8404
摘要： Magnetic recording media are controllably textured, particularly over areas designated for contact with data transducing heads. In connection with rigid media, the process includes polishing an aluminum nickel-phosphorous substrate to a specular finish, then rotating the disc while directing pulsed laser energy over a limited portion of the radius, thus forming an annular head contact band while leaving the remainder of the surface specular. The band is formed of multiple individual laser spots, each with a center depression surrounded by a substantially circular raised rim. The depth of the depressions and height of the rims are controlled primarily by laser power and firing pulse duration. The shape of individual laser spots can be altered by varying the laser beam inclination relative to the disc surface. On a larger scale, the frequency of firing the laser in combination with disc rotational speed controls the pattern or arrangement of laser spots. The smooth, rounded contours of the depressions and surrounding rims, as compared to the acicular character of mechanically textured surfaces, is a primary factor contributing to substantially increased durability of laser textured media.
摘要翻译： 磁记录介质可控制地纹理化，特别是在与数据传感头接触的区域上。 与刚性介质结合，该方法包括将铝镍磷基底抛光到镜面光洁度，然后旋转盘，同时将脉冲激光能量引导到半径的有限部分上，从而形成环形头接触带，同时留下其余的 表面镜面。 该带由多个单独的激光点形成，每个具有由基本上圆形的凸起边缘包围的中心凹陷。 凹槽的深度和边缘的高度主要由激光功率和点火脉冲持续时间控制。 可以通过改变相对于盘表面的激光束倾斜来改变单个激光斑点的形状。 在更大规模上，激光与光盘转速结合的频率控制激光点的图案或排列。 与机械纹理表面的针状特征相比，凹陷和周围边缘的光滑圆形轮廓是导致激光纹理介质的显着提高的耐久性的主要因素。
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公开(公告)号：US07192663B2
公开(公告)日：2007-03-20
申请号：US10728794
申请日：2003-12-08
申请人： Chung-Hee Chang , Rajiv Y. Ranjan
发明人： Chung-Hee Chang , Rajiv Y. Ranjan
CPC分类号： C23C14/025 , C23C14/165 , G11B5/667 , G11B5/732 , G11B5/851 , G11B5/852 , Y10T428/265
摘要： A perpendicular magnetic recording medium having a substrate, a seedlayer on the substrate and a magnetic underlayer on the seedlayer, the magnetic underlayer having an easy axis of magnetization substantially directed in a radial or transverse direction, and a process for manufacturing the perpendicular magnetic recording medium are disclosed.
摘要翻译： 具有衬底，衬底上的籽晶层和种子层上的磁性底层的垂直磁记录介质，所述磁性底层具有基本上沿径向或横向方向的易磁化磁化轴，以及用于制造垂直磁记录介质的方法 被披露。
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公开(公告)号：US06849326B1
公开(公告)日：2005-02-01
申请号：US09964690
申请日：2001-09-28
申请人： Li-Lien Lee , Samuel D. Harkness , Rajiv Y. Ranjan
发明人： Li-Lien Lee , Samuel D. Harkness , Rajiv Y. Ranjan
CPC分类号： G11B5/732 , G11B5/7325 , G11B5/8404 , Y10S428/90 , Y10T428/265
摘要： A magnetic recording medium containing a niobium-containing seedlayer having a thickness from about 1 Å to about 40 Å, and a method of making the same. The seedlayer provides a recording media with relatively high remanent coercivity and relatively high signal to medium noise ratio.
摘要翻译： 含有厚度为约〜40埃的含铌种子层的磁记录介质及其制造方法。 种子层提供具有相对高的残余矫顽力和相对高的信噪比的记录介质。
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