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Nanoscale investigation of thin film perpendicular magnetic recording media.

机译：薄膜垂直磁记录介质的纳米尺度研究。

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摘要

The HCP CoCrPtO Perpendicular magnetic recording media are attractive to achieve recording densities over 1 Tbit/in2 owing to their low media noise characteristics. Structural refinement is critical to the development of ultra-high recording density perpendicular media with low noise. The grain size and film thickness are on a scale of 8 nm and 20 nm or less, respectively, so it is evident that high-resolution transmission electron microscopy (HRTEM) is the most powerful method to characterize the nanoscale structural features and elucidate their effects on the magnetic recording media performance.; In CoCrPtO perpendicular media, one of the objectives as far as the structure is concerned, is to obtain media of magnetically decoupled grains. This can be done by isolating the Co-rich magnetic grains from each other with non-magnetic oxygen-rich grain boundaries. In the present study, CoCrPtO media were prepared by systematically varying the thickness and oxygen content of the magnetic layer, and their effect on the resulting film structure was investigated by HRTEM. Nano-probe energy dispersive X-ray spectroscopy (EDS) combined with HRTEM was used to perform compositional analysis and study the segregation effects. Higher oxygen incorporation was effective to form a well-isolated grain structure with oxygen-rich grain boundaries. However, non-uniform film structure with high stacking fault density was also observed with high oxygen content.; More precise control on the film structure of the perpendicular media often involves template layers such as interlayers and seedlayers. The role of these layers is not limited to the enhancement of the preferred vertical c-axis orientation but can be extended to the control of the grain size, grain size distribution, and grain isolation in the magnetic film. The effects of Ta/Ru template layers on the structural and magnetic properties of the magnetic film were investigated. Moreover, a novel Ru/Ru+(metal oxide) interlayer structure for further inter-granular exchange decoupling in the magnetic film was introduced and evaluated. The formation of a small and isolated grain structure on the surface of the interlayer was achieved by the addition of a Ru+(metal oxide) on a conventional Ru interlayer, which resulted in further grain isolation in the magnetic film.
机译：HCP CoCrPtO垂直磁记录介质因其较低的介质噪声特性而吸引了超过1 Tbit / in2的记录密度。结构改进对于开发低噪声的超高记录密度垂直媒体至关重要。晶粒尺寸和膜厚分别为8 nm和20 nm或更小，因此很明显，高分辨率透射电子显微镜（HRTEM）是表征纳米级结构特征并阐明其作用的最有效方法。磁记录媒体的性能。在CoCrPtO垂直介质中，就结构而言，目的之一是获得磁性去耦晶粒的介质。这可以通过将富钴磁性颗粒与非磁性富氧颗粒边界相互隔离来完成。在本研究中，通过系统地改变磁性层的厚度和氧含量来制备CoCrPtO介质，并通过HRTEM研究了它们对所得膜结构的影响。纳米探针能量色散X射线光谱（EDS）与HRTEM结合用于进行成分分析和研究偏析效果。较高的氧结合能有效地形成具有富氧晶界的良好隔离的晶粒结构。然而，在氧含量高的情况下，也观察到具有高堆垛层错密度的不均匀膜结构。对垂直介质的薄膜结构进行更精确的控制通常涉及模板层，例如中间层和种子层。这些层的作用不限于增强优选的垂直c轴取向，而是可以扩展到控制磁性膜中的晶粒尺寸，晶粒尺寸分布和晶粒隔离。研究了Ta / Ru模板层对磁性膜结构和磁性的影响。此外，介绍了一种新型的Ru / Ru +（金属氧化物）层间结构，用于进一步在磁性膜中进行晶间交换解耦。通过在常规Ru中间层上添加Ru +（金属氧化物），可以在中间层的表面上形成一个小的隔离晶粒结构，从而进一步隔离了磁性膜中的晶粒。

著录项

  • 作者

    Kwon, Unoh.;

  • 作者单位

    Stanford University.;

  • 授予单位 Stanford University.;
  • 学科 Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 2007
  • 页码 183 p.
  • 总页数 183
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 工程材料学;
  • 关键词

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