Measurements of intrinsic magnetism in multilayer graphene using cantilever magnetometry
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Date
2017-05
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The Ohio State University
Abstract
Due to the exponential rate at which technology is progressing, we find ourselves searching for novel nanomaterials at an ever increasing rate as the physical limits of our existing materials are being reached. One such exciting substance is graphene, famous for its extreme electronic characteristics. However one of the many steps necessary in bringing graphene into mainstream technology is the measurement of its intrinsic magnetism. In this thesis we obtain sensitive measurements of the magnetic susceptibility of multilayer graphene using the method of cantilever torque magnetometry, wherein torque exerted on a cantilever is measured from graphene's intrinsic magnetism in the presence of an external field. Fundamental to this process is our development of a method to successfully transfer mesoscopic-sized graphene layers onto micro-mechanical cantilevers. Observations of de Haas-van Alphen oscillations in bulk graphite are obtained, yielding a period of 0.25 (1/Tesla). The theoretical physics underlying these phenomena are recapitulated for completeness.
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Keywords
magnetism, graphene, susceptibility, cantilever, magnetometry