AAO模板濺射制備FePt納米點陣及磁性研究
[Abstract]:The patterned magnetic recording technique uses two-dimensional ordered magnetic nanoarrays as the recording medium, which can break through the limit of superparamagnetic effect in conventional continuous film media, and it is possible to increase the storage surface density of hard disk to 5 TB / in 2. The key to the application of patterned recording technology is to develop a high performance patterned magnetic recording medium. Because FePt has super high magnetic anisotropy energy and minimal superparamagnetic critical size, it has become a hot material in the preparation of patterned medium. At present, the preparation process is still one of the main challenges in the research of patterned magnetic recording. At present, there are three main methods: one is to use etching printing technology, but because of its time-consuming and high cost, it is only used in very small scale preparation; Another method is self-assembly technology, which can suppress particle aggregation and ensure highly ordered arrangement of magnetized axis during annealing. The last method is template synthesis, which can effectively improve the above problems. In this paper, FePt nanoscale lattice was prepared by sputtering on anodic alumina (AAO) template with easy pore size and thickness control by template synthesis technique. In this paper, the magnetron sputtering system and its mechanism are introduced, and the microanalysis and magnetic properties of the templates and samples are also described. Secondly, we successfully prepared Si based two-dimensional ordered micropore templates by using ultra-violet lithography and ICP etching techniques, and then prepared nano-porous alumina templates by two-step anodic oxidation method. AAO templates with different periods and pore sizes were prepared by adjusting the experimental parameters. Finally, FePt nanowires array was successfully fabricated on anodic alumina template by magnetron sputtering and quantitative etching. The effects of Ag substrate, annealing temperature and template aperture on the magnetic properties of FePt nanoscale lattice were discussed in detail. The results show that the vertical coercivity of Fe Pt nanoscale lattice can be greatly enhanced by Ag substrate. The FePt nanoscale lattice annealed at 600 擄C exhibits significant L10 phase structure and high hard magnetic properties. 80nm pore size template is more than 40nm pore template. It is beneficial to the deposition of FePt nanoparticles and the improvement of perpendicular magnetic properties.
【學位授予單位】:華中科技大學
【學位級別】:碩士
【學位授予年份】:2015
【分類號】:TB383.1
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