Phthalocyanine is macrocyclic complex molecule at the core of a wide range of applications such as gas sensors, flexible photovoltaic cells, and pigments. The study of iron phthalocyanine (FePc) morphology, charge transport, optics and magnetism improve the quality of these devices. Using thermal evaporation in a high vacuum, FePc thin films are deposited on silicon substrates at deposition temperatures ranging from room temperature (RT) to 200°C. The vibrating sample magnetometer is used to measure the magnetic properties of the FePc thin films. The magnetic properties of FePc thin films change upon exposure to ambient air due to its exposure to oxygen and water molecules and we track the properties over two time spans. Since FePc thin films exhibits magnetic hysteresis below 5 K, we report the change in saturation magnetization and magnetic coercivity for both the long term (5 years) and short term (6 months) time spans. Using data from four long term samples, we find that the magnetic saturation decreased in all samples and the coercivity remained constant. These results lead us to conclude that ambient air affects mostly the surface. In the short term study, we try to prevent oxidation with and metal-free phthalocyanine. This layer effectively slows the decreases in the magnetic saturation for FePc thin films.
|Commitee:||Gu, Jiyeong, Peterson, Michael R.|
|School:||California State University, Long Beach|
|Department:||Physics and Astronomy|
|School Location:||United States -- California|
|Source:||MAI 57/01M(E), Masters Abstracts International|
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