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URN etd-0707110-163620 Statistics This thesis had been viewed 2046 times. Download 260 times. Author Ming-Hung Hsieh Author's Email Address No Public. Department Materials Engineering Year 2009 Semester 2 Degree Master Type of Document Master's Thesis Language zh-TW.Big5 Chinese Page Count 131 Title Fabrication and characteristic study of nano-sized NiFe arrays on nanoporous anodic aluminum oxides Keyword Nanodot structure AAO NiFe Sputter Sputter NiFe AAO Nanodot structure Abstract NiFe nanodot films are deposited on anodic aluminum oxide (AAO) with different pore diameters by sputtering. The scanning electron microscope images show that the morphology of the as-deposited film with lower thickness of about 10 nm is nanodot structure. The as-deposited nanodot film with good soft magnetic properties and thermal stability can be obtained by controlling the sputtering parameters. The film with high in-plane coercivity ( Hc// ) of about 220 Oe could be obtained as the thickness is 10 nm, and decreased to 100 Oe as the thickness is 75 nm. The size effect of AAO templates would influence the morphology of stacked atoms. The rim of the pores, which act as obstacles to the stacked atoms, could prevent them from forming continuous films. The magnetization switching characteristics of the nanodot films are investigated experimentally and micromagnetically in more detail by measuring the angular dependence of the coercivity. This work showed that the effect on their magnetic properties associated with film thickness and morphology of NiFe nanodot films. The average size of magnetic domains and grains are increased with film thickness, leading to the decrease in in-plane coercivity. The magnetic properties strongly relate to the microstructure of NiFe films. The angular dependence of coercivity revealed that by increasing the film thickness, the magnetization reversal is changed from Stoner-Wohlfarth to domain-wall-motion. Advisor Committee Hong-Ming Lin - advisor
Da-Hua Wei - co-chair
Yeong-Der Yao - co-chair
Files Date of Defense 2010-06-30 Date of Submission 2010-07-08