Thesis defense | Ryan Tapping | spintronics and physics education research | Cornell University скачать в хорошем качестве

Thesis defense | Ryan Tapping | spintronics and physics education research | Cornell University

Spintronics (0:00) Physics education research (32:50) Topic: Ryan Tapping, B Exam Advisor: Dan Ralph Title: Additional sources to the signal: spin pumping in spin torque ferromagnetic resonance and student-level variables in linear mixed effects models Abstract: Measurements of any kind have notoriously been affected by omitted variables. I will present my work in both the fields of spintronics and physics education research to appropriately design models for analysis of our experiments. First, I will discuss spin torque ferromagnetic resonance (ST-FMR), a widely used technique for measuring spin-to-charge current conversion. I will show that extraneous sources to the DC voltage signal arise from spin pumping and can be accounted for in our model. Experiments with heavy-metal/ferromagnet heterostructures show large contributions from this extraneous signal, which can be quantified to determine the damping-like spin torque efficiency. Second, I will discuss my work on the comparison between two distinct styles of active engagement in our physics classrooms. Learning outcomes were measured using scores from the Conceptual Survey of Electricity and Magnetism (CSEM) and final course grades. To appropriately compare pedagogies, linear mixed effects models are used to account for student-level preparatory and demographic variables. Both types of active engagement showed improved scores over traditionally taught lectures, and interestingly specific implementations of active engagement practices did not have statistically significant differences in learning outcomes. Thesis: https://ecommons.cornell.edu/items/23...