公开(公告)号：US06432562B1

公开(公告)日：2002-08-13

申请号：US09393328

申请日：1999-09-10

申请人： Stella Z. Wu ,  Qixu Chen ,  Samuel D. Harkness, IV ,  Rajiv Y. Ranjan

发明人： Stella Z. Wu ,  Qixu Chen ,  Samuel D. Harkness, IV ,  Rajiv Y. Ranjan

IPC分类号： G11B566

CPC分类号： G11B5/732 ,  G11B5/7325 ,  G11B5/8404 ,  Y10S428/90 ,  Y10T428/265

摘要： High areal density magnetic recording media exhibiting high magnetic performance, e.g., narrow PW50, and high OW, and high SNR, are formed with a NiAlRu seedlayer. Embodiments of the present invention include sputter depositing a NiAlRu seedlayer on a non-magnetic substrate and sequentially depositing thereon a Cr or Cr alloy underlayer, e.g., CrMo, CrMn, CrV or CrW, a magnetic layer, e.g., a Co—Cr-containing magnetic alloy layer, and a protective overcoat, e.g., a carbon-containing protective overcoat.

摘要翻译： 使用NiAlRu种子层形成表现出高磁性能的高密度磁记录介质，例如窄PW50，高OW，高SNR。 本发明的实施例包括在非磁性衬底上溅射沉积NiAlRu种子层并且在其上依次沉积Cr或Cr合金底层，例如CrMo，CrMn，CrV或CrW，磁性层，例如含Co-Cr 磁性合金层和保护性外涂层，例如含碳保护性外涂层。

公开(公告)号：US06908689B1

公开(公告)日：2005-06-21

申请号：US10022728

申请日：2001-12-20

申请人： Qixu Chen ,  Zhong Wu ,  Samuel D. Harkness, IV ,  Rajiv Y. Ranjan

发明人： Qixu Chen ,  Zhong Wu ,  Samuel D. Harkness, IV ,  Rajiv Y. Ranjan

IPC分类号： G11B5/64 ,  G11B5/73 ,  G11B5/66

CPC分类号： G11B5/7325 ,  G11B5/656 ,  Y10T428/12465 ,  Y10T428/12743 ,  Y10T428/1275 ,  Y10T428/12931 ,  Y10T428/26 ,  Y10T428/31

摘要： A magnetic recording medium containing a B-2 structured ruthenium-aluminum underlayer comprising a (200) crystallographic orientation with a thickness from about 50 Å to about 800 Å, and a magnetic layer with a Co(11.0) crystallographic orientation, and a method of making the same are disclosed. The medium deposited on mechanically textured and surface-oxidized NiP film has a relatively high remanent coercivity and a relatively high signal to medium noise ratio even at low OR-Mrt.

摘要翻译： 一种含有B层结构的钌 - 铝底层的磁记录介质，其包含厚度为约至约800埃的（200）结晶取向和具有Co（11.0）结晶取向的磁性层，以及一种 做出相同的披露。 沉积在机械织构和表面氧化的NiP膜上的介质具有相对较高的残余矫顽力和甚至在低OR-Mrt时相对较高的信噪比。

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

IPC分类号： G11B5/73 ,  G11B5/66

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。

公开(公告)号：US06759149B1

公开(公告)日：2004-07-06

申请号：US09906835

申请日：2001-07-18

申请人： Qixu Chen ,  Zhong Wu ,  Rajiv Y. Ranjan

发明人： Qixu Chen ,  Zhong Wu ,  Rajiv Y. Ranjan

IPC分类号： G11B566

CPC分类号： G11B5/732 ,  G11B5/656 ,  G11B5/66 ,  G11B5/7325 ,  Y10S428/90 ,  Y10T428/265

摘要： Laminated magnetic recording medium with two Co-containing layers separated by a non-magnetic interlayer is stablished by Ru-containing layers between the recording layers and Co-containing stablization layers through antiferromagnetic coupling.

摘要翻译： 通过非磁性中间层分离的具有两个含Co层的层叠磁记录介质通过反铁磁耦合在记录层和含Co稳定层之间的含Ru层保持稳定。

公开(公告)号：US06150016A

公开(公告)日：2000-11-21

申请号：US188681

申请日：1998-11-10

申请人： Xing Song ,  Qixu Chen ,  Charles Leu ,  Rajiv Y. Ranjan

发明人： Xing Song ,  Qixu Chen ,  Charles Leu ,  Rajiv Y. Ranjan

IPC分类号： G11B5/66 ,  G11B5/851

CPC分类号： G11B5/851 ,  G11B5/66 ,  Y10S428/90 ,  Y10T428/26 ,  Y10T428/265

摘要： A high areal density magnetic recording medium exhibiting high remanent coercivity and high coercivity squareness is formed with a thin CoCrTa intermediate layer to provide appropriate crystalline orientation and surface morphology for nucleation and growth of a magnetic layer thereon. The present invention also enables the use of lower substrate heating temperatures during deposition. Embodiments include depositing an intermediate Co alloy layer comprising about 10 up to about 15 atomic % Cr and about 1 to about 6 atomic % Ta at a thickness of about 1.5 to about 150 .ANG..

摘要翻译： 利用薄的CoCrTa中间层形成表现出高剩磁矫顽力和高矫顽力矩形度的高密度磁记录介质，为其上的磁性层的成核和生长提供适当的晶体取向和表面形态。 本发明还能够在沉积期间使用较低的基板加热温度。 实施方案包括沉积包含约10至约15原子％Cr和约1至约6原子％Ta的中间Co合金层，厚度为约1.5至约150埃。

公开(公告)号：US06596419B1

公开(公告)日：2003-07-22

申请号：US09960538

申请日：2001-09-24

申请人： Qixu Chen ,  Li-Lien Lee ,  Rajiv Y. Ranjan

发明人： Qixu Chen ,  Li-Lien Lee ,  Rajiv Y. Ranjan

IPC分类号： G11B566

CPC分类号： G11B5/732 ,  G11B5/7325 ,  Y10S428/90 ,  Y10T428/12465 ,  Y10T428/12854 ,  Y10T428/265

摘要： A bi-crystal magnetic recording media, i.e., media with Cr(200) and Co(11.0) orientations, comprising non-metallic substrates, CrTi or NiPOx seed layers, B2-structured CoTi first underlayers, Cr-alloy second underlayers, and Co-alloy magnetic layers have high coercivity, high SMNR and high areal recording density.

摘要翻译： 双晶磁记录介质，即具有Cr（200）和Co（11.0）取向的介质，包括非金属基底，CrTi或NiPOx种子层，B2结构的CoTi第一底层，Cr合金第二底层和Co 合金磁性层具有高矫顽力，高SMNR和高面积记录密度。

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

IPC分类号： G11B5/73 ,  G11B5/66

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。

公开(公告)号：US5507930A

公开(公告)日：1996-04-16

申请号：US299852

申请日：1994-09-01

申请人： Tsutomu T. Yamashita ,  Kyou H. Lee ,  Rajiv Y. Ranjan ,  Yuri Trachuk

发明人： Tsutomu T. Yamashita ,  Kyou H. Lee ,  Rajiv Y. Ranjan ,  Yuri Trachuk

IPC分类号： C23C14/06 ,  C23C14/34 ,  C23C14/35 ,  G11B5/72 ,  G11B5/84 ,  H01F41/18

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。

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

IPC分类号： G11B5/00 ,  G11B5/60 ,  G11B5/82 ,  G11B5/84 ,  G11B23/50

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.

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

IPC分类号： G11B5/66 ,  G11B5/70

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。