In this dissertation begin with an investigation of non-local spin transport in an amorphous germanium (a-Ge) sample via the inverse spin Hall effect (ISHE). In that study we show that commonly used techniques such as differential conductance and delta mode of a paired Keithley 6221/2182a for non-local resistance measurements can lead to false indicators of spin transport. Next, we turn out attention to a thickness dependent study in thermally-evaporated chromium (Cr) thin films on a bulk polycrystalline yttrium-iron-garnet (YIG) substrate. This project analyzed the spin transport in the Cr films versus thickness via the longitudinal spin Seebeck effect (LSSE). This research revealed a complex thickness dependence of the spin-to-charge conversion and LSSE voltages for the evaporated Cr that may be a consequence of strain in Cr and finite size effects. We continue to examine LSSE in thermallyevaporated Cr, but now under a temperature dependent study. The results reveal an enhancement in the evaporated Cr below 200 K, where the Cr thin film transitions from a mixed SDW antiferromagnetic state described by the combination of a antiferromagnetic commensurate SDW (CSDW) and paramagnetic incommensurate SDW (ISDW) to a full antiferromagnetic state where both CSDW and ISDW are antiferromagnetic. This is absent in sputtered Cr thin films deposited on similar YIG substrates. Finally, we explore the spin-flopped coupled lanthanum strontium ferrite (LSFO) lanthanum strontium manganite (LSMO) bilayer grown on a lanthanum strontium aluminate (LSAT) substrate. This research focuses on the possible control of magnetic moments using current pulses.
","abstract_html":"<p>In this dissertation begin with an investigation of non-local spin transport in an amorphous germanium (a-Ge) sample via the inverse spin Hall effect (ISHE). In that study we show that commonly used techniques such as differential conductance and delta mode of a paired Keithley 6221/2182a for non-local resistance measurements can lead to false indicators of spin transport. Next, we turn out attention to a thickness dependent study in thermally-evaporated chromium (Cr) thin films on a bulk polycrystalline yttrium-iron-garnet (YIG) substrate. This project analyzed the spin transport in the Cr films versus thickness via the longitudinal spin Seebeck effect (LSSE). This research revealed a complex thickness dependence of the spin-to-charge conversion and LSSE voltages for the evaporated Cr that may be a consequence of strain in Cr and finite size effects. We continue to examine LSSE in thermallyevaporated Cr, but now under a temperature dependent study. The results reveal an enhancement in the evaporated Cr below 200 K, where the Cr thin film transitions from a mixed SDW antiferromagnetic state described by the combination of a antiferromagnetic commensurate SDW (CSDW) and paramagnetic incommensurate SDW (ISDW) to a full antiferromagnetic state where both CSDW and ISDW are antiferromagnetic. This is absent in sputtered Cr thin films deposited on similar YIG substrates. Finally, we explore the spin-flopped coupled lanthanum strontium ferrite (LSFO) lanthanum strontium manganite (LSMO) bilayer grown on a lanthanum strontium aluminate (LSAT) substrate. This research focuses on the possible control of magnetic moments using current pulses.</p>","abstract_has_math":false,"creators":["Bleser, Sam M."],"institution":null,"degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":null,"degree_department":null,"school":null,"contributors":["Barry L. Zink","Xin Fan","Pavel Salev","Michelle K. Knowles"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2024,"date_issued":"2024-03-01T08:00:00Z","date_published":"2024-03-01T08:00:00Z","updated_at":"2026-07-24T02:01:48Z","subjects":["Spin hall effect","Spincaloritronics","Spintronics","Condensed Matter Physics","Materials Science and Engineering","Other Materials Science and Engineering","Physical Sciences and Mathematics","Physics"],"languages":["English (eng)"],"rights":["Copyright is held by the author. User is responsible for all copyright compliance.
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"]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["The Interplay of Spin, Charge, and Heat: From Metal/Insulator Heterostructures to Perovskite Bilayers"]}]}],"canonical_facts":{"dc:contributor":["Barry L. Zink","Xin Fan","Pavel Salev","Michelle K. Knowles"],"dc:creator":["Bleser, Sam M."],"dc:description.abstract":["In this dissertation begin with an investigation of non-local spin transport in an amorphous germanium (a-Ge) sample via the inverse spin Hall effect (ISHE). In that study we show that commonly used techniques such as differential conductance and delta mode of a paired Keithley 6221/2182a for non-local resistance measurements can lead to false indicators of spin transport. Next, we turn out attention to a thickness dependent study in thermally-evaporated chromium (Cr) thin films on a bulk polycrystalline yttrium-iron-garnet (YIG) substrate. This project analyzed the spin transport in the Cr films versus thickness via the longitudinal spin Seebeck effect (LSSE). This research revealed a complex thickness dependence of the spin-to-charge conversion and LSSE voltages for the evaporated Cr that may be a consequence of strain in Cr and finite size effects. We continue to examine LSSE in thermallyevaporated Cr, but now under a temperature dependent study. The results reveal an enhancement in the evaporated Cr below 200 K, where the Cr thin film transitions from a mixed SDW antiferromagnetic state described by the combination of a antiferromagnetic commensurate SDW (CSDW) and paramagnetic incommensurate SDW (ISDW) to a full antiferromagnetic state where both CSDW and ISDW are antiferromagnetic. This is absent in sputtered Cr thin films deposited on similar YIG substrates. Finally, we explore the spin-flopped coupled lanthanum strontium ferrite (LSFO) lanthanum strontium manganite (LSMO) bilayer grown on a lanthanum strontium aluminate (LSAT) substrate. This research focuses on the possible control of magnetic moments using current pulses.
"],"dc:format":["application/pdf"],"dc:identifier":["https://digitalcommons.du.edu/etd/2371"],"dc:language":["English (eng)"],"dc:rights":["Copyright is held by the author. User is responsible for all copyright compliance.
"],"dc:subject":["Spin hall effect","Spincaloritronics","Spintronics","Condensed Matter Physics","Materials Science and Engineering","Other Materials Science and Engineering","Physical Sciences and Mathematics","Physics"],"dc:title":["The Interplay of Spin, Charge, and Heat: From Metal/Insulator Heterostructures to Perovskite Bilayers"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."]},"updated_at":"2026-07-24T02:01:48Z"}