Measurements of intrinsic magnetism in multilayer graphene using cantilever magnetometry
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Date
2017-03-29
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Abstract
Graphene is widely regarded as one of the most promising emergent materials. Unique characteristics such as quasi-relativistic charge carriers cause graphene to be of great interest for fundamental physics as well as for engineering applications. Physical properties such as electrical and thermal conductivity have been extensively studied, but direct measurements of graphene's intrinsic magnetism remains elusive due to its relatively weak interactions. The intrinsic magnetism, quantified as magnetic susceptibility, must be understood if graphene is to be optimally integrated with future technologies. Our purpose here is to obtain sensitive measurements of the susceptibility using the method of cantilever 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. We will show the susceptibility measurements of multilayer graphene, performed at low temperatures (4 Kelvin), yielding an out-of-plane susceptibility of -5.6*10^(-4). For future studies, we are working on experiments to transfer single-layer graphene onto cantilevers and then perform magnetometry measurements. These studies will allow deeper insight into the magnetic nature of graphene and its applicability in emerging technologies.
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Mathematical and Physical Sciences (The Ohio State University Denman Undergraduate Research Forum)
Keywords
magnetism, graphene, susceptibility, cantilever, magnetometry