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Graphene Devices for Sensing and Electrical Control of Magnetic Phenomena

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Abstract

Graphene is a material consisting of a single layer of carbon atoms, with distinctive electronic characteristics that make it an interesting platform for a variety of applications. In this dissertation, I discuss projects applying graphene towards experiments involving scanning magnetometry, a technique to image stray magnetic fields above the surface of a material or device. First, I provide an overview of scanning magnetometry techniques and detailed fabrication procedures for high-quality graphene devices. Then, I evaluate ultraclean graphene as a material for highly sensitive Hall-effect sensors. These devices are promising for the development of a scanning Hall probe microscope operational over a range of temperatures and magnetic fields not previously accessible with a single sensor. I then discuss calculations predicting an orbital magnetoelectric effect in strained bilayer graphene. This effect is electrically tunable, switchable, and arises from orbital degrees of freedom. Finally, I present progress towards experimentally realizing strained bilayer graphene devices and propose studying the effect using scanning magnetometry.

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175 pages

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2021-05

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Keywords

graphene; Hall sensors; magnetometry; orbital magnetism; scanning probe microscopy

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Committee Chair

Nowack, Katja C.

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Committee Member

McEuen, Paul L.
Mueller, Erich

Degree Discipline

Physics

Degree Name

Ph. D., Physics

Degree Level

Doctor of Philosophy

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Government Document

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dissertation or thesis

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