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This research aims to study the upper critical field of superconductor/ferromagnet bilayers and compare its variations to the transition temperature changes. Films were grown using magnetron sputtering, with thickness measured at Georgia Tech's IEN. Measurements were done resistively and inductively across temperature and magnetic fields. The Niobium thickness remained constant at 33 nm, while Nickel varied between 0 to 8 nm. Experimental setup included leads and coils for low-temperature property measurements, following Usadel theory's behavior. Research conducted by Daniel C. Ralph at Cornell University (ECCS 0335765) with contributions from Tim Ahrenholz, Emily Davis, and Phillip Broussard of Covenant College, performed at Georgia Tech's Institute for Electronics and Nanotechnology.
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Nb/Ni Bilayers: Superconductivity The purpose of this research is to study the upper critical field of S/F (superconductor/ferromagnet) bilayers and see how it varies in comparison to how the transition temperature varies. Films were grown by magnetron sputtering, with film thicknesses measured at the IEN at Georgia Tech. Films were measured both resistively and inductively as a function of both temperature and magnetic field. Niobium thickness was held at 33 nm, and Nickel thickness was varied from 0 to 8 nm. Daniel C. Ralph, Cornell University, ECCS 0335765 At right we show the film with leads and coil in place to measure film properties at low temperature. Critical temperature follows the nonmonotonic behavior of Usadel theory. Tim Ahrenholz, Emily Davis and Phillip Broussard, Covenant College Work performed at Georgia Tech Institute for Electronics and Nanotechnology
