Manganese Phthalocyanine (MnPc) is studied as a powder and as thin film form using scanning electron microscope, atomic force microscope, x-ray powder/thin film diffraction, magnetic hysteresis measurements, and temperature dependence susceptibility measurements. The powder crystallizes as mono-clinic β phase, but thin films can have different polymorphs depending on their substrate temperature during deposition. Manganese Phthalocyanine molecules in thin films have a standing orientation relative to the substrate surface possibly due to weak surface interactions. MnPc powder is ferromagnetic but MnPc thin films can either be ferromagnetic or canted-antiferromagnetic depending on different thin film polymorphs. The thin film sample deposited at 100◦C is likely canted-antiferromagnetic based on a non-zero magnetic moment at low temperature and a negative intercept of inversed susceptibility. The thin film sample deposited at 230◦C is ferromagnetic with transition temperature near 7.2 K and has an effective magnetic moment per formula unit of 7.15 µB.
|Commitee:||Ojeda-Aristizabal, Claudia, Peterson, Michael|
|School:||California State University, Long Beach|
|Department:||Physics and Astronomy|
|School Location:||United States -- California|
|Source:||MAI 56/02M(E), Masters Abstracts International|
|Subjects:||Electromagnetics, Condensed matter physics|
|Keywords:||Manganese phthalocyanine, Phthalocyanine, Thin films|
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