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首页> 外文期刊>Nanotechnology >Fabrication and characterization of nano-particulate PtCo media for ultra-high density perpendicular magnetic recording
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Fabrication and characterization of nano-particulate PtCo media for ultra-high density perpendicular magnetic recording

机译：用于超高密度垂直磁记录的纳米颗粒PtCo介质的制备和表征

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摘要

The year-on-year growth in areal recording density maintained now for half a century by the hard disk industry has required a corresponding reduction in the size of the magnetic grains comprising the storage media employed. Grain dimensions are now such that the performance of materials which thus far have served the industry well can no longer be maintained as further reduction in their volume risks breaching the superparamagnetic limit with the attendant loss of data integrity. The high magnetocrystalline anisotropy of the Ll(0) phase of PtCo allows particles as small as 4 nm diameter to remain magnetically stable in the elevated temperature environment typical of disk drive systems. A non-interacting dispersion of nanomagnetic particles suspended in an inert non-magnetic host such that each has its anisotropy axis directed perpendicular to the surface of the medium now constitutes the new ideal for a recording medium. Fabrication by a novel combination of conventional sputtering and thermal processing technologies of a medium closely approximating this ideal is demonstrated. An optimized two-stage fabrication process produces a near mono-dispersion of particles with magnetic activation volumes centred about 5 x 10(-26) m(-3) and crystallized in the L1(0) phase with an orientated tetragonal structure. The characteristics of this medium are discussed as a function of composition and crystalline structure. In the absence of a thermally assisted recording head, experiments are conducted on a degraded form of the medium that is shown to support perpendicular recording at linear densities in excess of 240 kfci ( D50 point).
机译：硬盘行业现在将面记录密度按年增长的趋势已经保持了半个世纪，这就要求相应地减小构成所使用的存储介质的磁性颗粒的尺寸。现在的晶粒尺寸已无法维持迄今为行业所用的材料的性能，因为其体积的进一步减小有违反超顺磁性极限的风险，并伴随而来的是数据完整性的损失。 PtCo的Ll（0）相的高磁晶各向异性允许直径小至4 nm的颗粒在磁盘驱动器系统典型的高温环境中保持磁稳定。悬浮在惰性非磁性主体中的纳米磁性粒子的非相互作用分散体，使得每个各向异性轴的垂直于介质表面的方向现已成为记录介质的新理想选择。展示了通过传统溅射和热处理技术的新颖结合来制造非常接近该理想值的介质。优化的两阶段制造工艺可产生具有接近5 x 10（-26）m（-3）磁激活量并在L1（0）相中以定向四方晶结构结晶的磁活化粒子近乎单分散的状态。讨论了该介质的特性与组成和晶体结构的关系。在没有热辅助记录头的情况下，对降解形式的介质进行了实验，该介质被证明可以以超过240 kfci（D50点）的线性密度支持垂直记录。

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