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    Perpendicular magnetic recording media with improved crystallographic orientations and method of manufacturing same
    1.
    发明授权
    Perpendicular magnetic recording media with improved crystallographic orientations and method of manufacturing same 有权
    具有改善晶体取向的垂直磁记录介质及其制造方法

    公开(公告)号：US07175925B2

    公开(公告)日：2007-02-13

    申请号：US10663670

    申请日：2003-09-17

    申请人： Qixu David Chen ,  Thomas P. Nolan ,  Zhong Stella Wu ,  Samuel Dacke Harkness, IV ,  Rajiv Yadav Ranjan

    发明人： Qixu David Chen ,  Thomas P. Nolan ,  Zhong Stella Wu ,  Samuel Dacke Harkness, IV ,  Rajiv Yadav Ranjan

    IPC分类号： G11B5/66 ,  G11B5/70

    CPC分类号： G11B5/732 ,  G11B5/667 ,  G11B2005/0029

    摘要： A perpendicular magnetic recording medium, comprising: (a) a non-magnetic substrate having a surface; and (b) a layer stack formed over the substrate surface, comprising in overlying sequence from the substrate surface: (i) a magnetically soft underlayer; (ii) an interlayer structure for crystallographically orienting a layer of a perpendicular magnetic recording material formed thereon; and (iii) at least one crystallographically oriented magnetically hard perpendicular recording layer; wherein the magnetically soft underlayer is sputter-deposited at a sufficiently large target-to-substrate spacing and at a sufficiently low gas pressure selected to provide the underlayer with a smooth surface having a low average surface roughness Ra below about 0.3 nm, as measured by Atomic Force Microscopy (AFM).

    摘要翻译： 一种垂直磁记录介质，包括：（a）具有表面的非磁性基板; 和（b）形成在所述衬底表面上的层叠层，包括从所述衬底表面的重叠顺序：（i）磁软底层; （ii）用于晶体取向形成在其上的垂直磁记录材料层的层间结构; 和（iii）至少一个晶体取向的磁性硬垂直记录层; 其中所述磁软底层被溅射沉积在足够大的靶对衬底间隔处并且以足够低的气体压力被选择以使底层具有平均表面，其具有低于约0.3nm的低平均表面粗糙度Ra，如通过 原子力显微镜（AFM）。

    Magnetic recording media with a nialox sub-seedlayer
    3.
    发明授权
    Magnetic recording media with a nialox sub-seedlayer 失效
    具有nialox子种子层的磁记录介质

    公开(公告)号：US06346339B1

    公开(公告)日：2002-02-12

    申请号：US09379505

    申请日：1999-08-23

    申请人： Samuel Dacke Harkness, IV ,  Qixu (David) Chen ,  Zhong (Stella) Wu ,  Rajiv Yadav Ranjan

    发明人： Samuel Dacke Harkness, IV ,  Qixu (David) Chen ,  Zhong (Stella) Wu ,  Rajiv Yadav Ranjan

    IPC分类号： G11B566

    CPC分类号： G11B5/732 ,  C23C14/024 ,  G11B5/656 ,  G11B5/66 ,  G11B5/7325 ,  G11B5/8404

    摘要： Magnetic recording media exhibiting enhanced SMNR are formed with an NiAlOx sub-seedlayer for microstructural control of the underlayer to enable deposition and growth of a magnetic layer exhibiting a (10{overscore (1)}0)-predominant crystallographic orientation and small, uniform grain size. Embodiments include completely reactive sputter depositing a NiAlOx sub-seedlayer on a glass-ceramic substrate and sequentially depositing thereon a NiAl seedlayer, a Cr or Cr-alloy underlayer, e.g., CrMo, a Co—Cr magnetic layer and a protective overcoat, e.g., carbon. The resulting magnetic recording media exhibit a high SMNR, high OW, narrow PW50, improved jitter and improved Hr.

    摘要翻译： 用NiAlOx亚子层形成表现出增强的SMNR的磁记录介质，用于底层的微结构控制，以使得能够沉积和生长表现出（10（超核（1）} 0） - 优势晶体取向的磁性层和小的均匀晶粒 尺寸。 实施例包括在玻璃 - 陶瓷衬底上完全反应性溅射沉积NiAlO x子种子层并且依次在其上沉积NiAl种子层，Cr或Cr-合金底层，例如CrMo，Co-Cr磁性层和保护性外涂层， 碳。 所得到的磁记录介质表现出高SMNR，高OW，窄PW50，改善的抖动和改善的Hr。

    Magnetic recording media with a surface-oxidized nial sub-seedlayer
    6.
    发明授权
    Magnetic recording media with a surface-oxidized nial sub-seedlayer 失效
    具有表面氧化的Nial子种子层的磁记录介质

    公开(公告)号：US06348276B1

    公开(公告)日：2002-02-19

    申请号：US09382581

    申请日：1999-08-25

    申请人： Qixu Chen ,  Zhong Wu ,  Samuel Dacke Harkness, IV ,  Charles Leu ,  Rajiv Yadav Ranjan

    发明人： Qixu Chen ,  Zhong Wu ,  Samuel Dacke Harkness, IV ,  Charles Leu ,  Rajiv Yadav Ranjan

    IPC分类号： G11B566

    CPC分类号： G11B5/732 ,  C23C14/025 ,  G11B5/66 ,  G11B5/7325 ,  G11B5/8404

    摘要： Magnetic recording media with high coercivity and low noise, suitable for high density longitudinal recording, are formed with a surface oxidized sub-seedlayer between a non-magnetic substrate and seedlayer. Embodiments include depositing a NiAl sub-seedlayer on a glass or glass-ceramic substrate, oxidizing the surface of the NiAl sub-seedlayer, and then sequentially depositing a NiAl seedlayer, Cr or Cr alloy underlayer, e.g., CrMo, an optional intermediate CoCrTa alloy layer, a magnetic layer, e.g., a Co-alloy magnetic layer, and a protective overcoat, e.g., a carbon-containing protective overcoat.

    摘要翻译： 在非磁性基材和籽晶层之间形成表面氧化亚子层，适用于高密度纵向记录的具有高矫顽力和低噪声的磁记录介质。 实施例包括在玻璃或玻璃陶瓷基片上沉积NiAl亚子层，氧化NiAl亚子层的表面，然后依次沉积NiAl种子层，Cr或Cr合金底层，例如CrMo，任选的中间CoCrTa合金 层，磁性层，例如Co合金磁性层和保护性外涂层，例如含碳保护性外涂层。

    High density magnetic recording medium with high Hr and low Mrt
    8.
    发明授权
    High density magnetic recording medium with high Hr and low Mrt 有权
    高密度，低密度磁记录介质

    公开(公告)号：US6156422A

    公开(公告)日：2000-12-05

    申请号：US188678

    申请日：1998-11-10

    申请人： Zhong (Stella) Wu ,  Rajiv Yadav Ranjan

    发明人： Zhong (Stella) Wu ,  Rajiv Yadav Ranjan

    IPC分类号： G11B5/73 ,  G11B5/66

    CPC分类号： G11B5/732 ,  G11B5/7325 ,  Y10S428/90 ,  Y10T428/26 ,  Y10T428/265

    摘要： A magnetic recording medium exhibiting high in-plane anisotropy at low Mrt is formed employing a NiAl seedlayer and a CrMn underlayer thereon. Embodiments include magnetic recording media with a CoCrPtTa magnetic alloy layer exhibiting a Hr greater than 2800 Oe with a Mrt no greater than 0.5 memu/cm.sup.2. The resulting media also exhibit high S* and low media noise.

    摘要翻译： 在低Mrt处表现出高的面内各向异性的磁记录介质使用NiAl种层和CrMn底层在其上形成。 实施方案包括具有表现出大于2800Oe的Hr的CoCrPtTa磁性合金层的磁记录介质，Mrt不大于0.5 memu / cm 2。 所得到的介质也表现出高S *和低介质噪声。