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Constructing and Characterizing a Scanning SQUID Microscope for a Cryogen Free Dilution Refrigerator

dc.contributor.authorLow, David
dc.contributor.chairFuchs, Gregory David
dc.contributor.committeeMemberSelman, Bart
dc.contributor.committeeMemberNowack, Katja C.
dc.date.accessioned2022-01-24T18:07:53Z
dc.date.available2022-01-24T18:07:53Z
dc.date.issued2021-12
dc.description122 pages
dc.description.abstractSuperconducting quantum interference devices, or SQUIDs, are highly sensitiveto magnetic flux and can be used to perform magnetic imaging at cryogenic tem- peratures. In this dissertation, I describe the first scanning SQUID microscope in a cryogen-free dilution refrigerator. First, I briefly describe basic SQUID theory, how to perform scanning SQUID microscopy, and how to design SQUIDs suited for microscopy. Next, I discuss both the apparatus and method to systematically characterize SQUIDs. I demonstrate that while heuristics provide guidance for finding low noise operating points, one often misses the best noise performance of the SQUID found by a systematic search. I also briefly discuss how to use ma- chine learning to predict SQUID noise. I then describe in depth the design of the SQUID microscope, focusing on explaining the reasons behind various features of the coldfinger and microscope. Finally, I describe how to characterize vibrations in our microscope using images of a vortex in a superconductor.
dc.identifier.doihttps://doi.org/10.7298/xxa1-4w48
dc.identifier.otherLow_cornellgrad_0058F_12837
dc.identifier.otherhttp://dissertations.umi.com/cornellgrad:12837
dc.identifier.urihttps://hdl.handle.net/1813/110839
dc.language.isoen
dc.rightsAttribution 4.0 International
dc.rights.urihttps://creativecommons.org/licenses/by/4.0/
dc.titleConstructing and Characterizing a Scanning SQUID Microscope for a Cryogen Free Dilution Refrigerator
dc.typedissertation or thesis
dcterms.licensehttps://hdl.handle.net/1813/59810.2
thesis.degree.disciplineApplied Physics
thesis.degree.grantorCornell University
thesis.degree.levelDoctor of Philosophy
thesis.degree.namePh. D., Applied Physics

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