Ferromagnetic nanostructures have a characteristic size at the critical length scale for magnetic domains, optical propagation and plasmonic resonance. For applications such as biosensing, ferromagnetic nanostructures need to be fabricated at the wafer scale. Nanosphere lithography is a candidate for wafer scale fabrication of ferromagnetic nanostructures. Two types of nanosphere lithography are investigated: drop casting and spin coating. Drop casting is used for producing model systems, while spin coating can be used for wafer scale production. The magneto-optical properties of nanostructures produced by each method were studied using the magneto-optical Kerr effect (MOKE). In drop casted samples, the coercivity increased compared to flat thin films. In spin coated samples, Kerr rotation reversal and anomalous peaks occurred. A two-phase model was used to simulate the MOKE data of spin coated samples. The simulation reproduced qualitative features of MOKE hysteresis loops, but not certain details, implying there are more than two phases or interactions between the phases.
|Commitee:||Kwon, Chuhee, Pickett, Galen|
|School:||California State University, Long Beach|
|Department:||Physics and Astronomy|
|School Location:||United States -- California|
|Source:||MAI 54/05M(E), Masters Abstracts International|
|Subjects:||Nanoscience, Condensed matter physics|
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