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Dissertation/Thesis Abstract

Magnetic properties of manganese phthalocyanine thin films
by Duong, Larry Le Ngoc, M.S., California State University, Long Beach, 2016, 53; 10240059
Abstract (Summary)

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.

Indexing (document details)
Advisor: Gredig, Thomas
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
Publication Number: 10240059
ISBN: 978-1-369-44025-6
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