Constructing and Characterizing a Scanning SQUID Microscope for a Cryogen Free Dilution Refrigerator
dc.contributor.author | Low, David | |
dc.contributor.chair | Fuchs, Gregory David | |
dc.contributor.committeeMember | Selman, Bart | |
dc.contributor.committeeMember | Nowack, Katja C. | |
dc.date.accessioned | 2022-01-24T18:07:53Z | |
dc.date.available | 2022-01-24T18:07:53Z | |
dc.date.issued | 2021-12 | |
dc.description | 122 pages | |
dc.description.abstract | Superconducting 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.doi | https://doi.org/10.7298/xxa1-4w48 | |
dc.identifier.other | Low_cornellgrad_0058F_12837 | |
dc.identifier.other | http://dissertations.umi.com/cornellgrad:12837 | |
dc.identifier.uri | https://hdl.handle.net/1813/110839 | |
dc.language.iso | en | |
dc.rights | Attribution 4.0 International | |
dc.rights.uri | https://creativecommons.org/licenses/by/4.0/ | |
dc.title | Constructing and Characterizing a Scanning SQUID Microscope for a Cryogen Free Dilution Refrigerator | |
dc.type | dissertation or thesis | |
dcterms.license | https://hdl.handle.net/1813/59810.2 | |
thesis.degree.discipline | Applied Physics | |
thesis.degree.grantor | Cornell University | |
thesis.degree.level | Doctor of Philosophy | |
thesis.degree.name | Ph. D., Applied Physics |
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