Type of Document	Dissertation
Author	Magana, Donny
Author's Email Address	donnym1@hotmail.com
URN	etd-10242007-101308
Title	Synthesis and Characterization of Dilute Magnetic Semiconductor Nanoparticles
Degree	Doctor of Philosophy
Department	Chemistry and Biochemistry, Department of
Advisory Committee	Advisor Name Title Geoffrey F. Strouse Committee Chair Naresh Dalal Committee Co-Chair Sir Harold Kroto Committee Member Stephan von Molnar Committee Member
Keywords	Nanoparticles Dilute Magnetic Semiconductor Magnetism
Date of Defense	2007-08-30
Availability	unrestricted
Abstract This dissertation studies the optical and magnetic properties of CdSe, including alloys which incorporate Mn (II) and sulfur. The first chapter explains the theory used to analyze the data and the properties expected for condensed phase materials at the nanoscale. The second chapter probes the magnetic and EPR results for Mn doped CdSe under different synthetic environments. The process of annealing was found to cluster the manganese resulting in ferromagnetic exchange. The third chapter involves further analysis of Mn doped CdSe with the possibility of sulfur incorporation from the synthetic strategy employed where a spin wave was observed due to the ferromagnetic interactions in the sample. The presence of carriers helps explain reasons for the observation of a spin wave in Mn:CdSSe as observed in the heat capacity measurements. The fourth chapter is the magneto-absorption study on the Mn doped CdSSe in comparison to CdSSe. The sulfur incorporation may have affected the results. The fifth chapter is a study of sulfur incorporation in CdSe and the effects on the magneto-photoluminescence properties. The techniques employed include a magnetic field to separate the spin levels and determine which of the states was influenced by the sulfur incorporation. The sixth chapter involves an exciton temperature dependent study of CdSSe in a magnetic field.
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