{"id":{"repo_id":"buffalo","oai_identifier":"oai:ubir.buffalo.edu:10477/86672"},"canonical_url":"https://search.dev.ndltd.org/etd/buffalo/oai:ubir.buffalo.edu:10477/86672","repository":{"repo_id":"buffalo","name":"Buffalo","base_url":"https://ubir.buffalo.edu/oai/request"},"display":{"title":"Magnetic Proximity Effects in Hybrid Graphene/Ferromagnetic Systems","abstract":"Ph.D.","abstract_html":"Ph.D.","abstract_has_math":false,"creators":["Arabchigavkani, Nargess; 0000-0003-1459-1051"],"institution":"State University of New York at Buffalo","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":["Bird, Jonathan","Physics"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2025,"date_issued":"2025-02-21T21:36:18Z","date_published":"2025-02-21T21:36:18Z","updated_at":"2026-07-27T19:05:34Z","subjects":["physics","condensed matter physics","nanoscience"],"languages":["eng"],"rights":["Users of works found in University at Buffalo Institutional Repository (UBIR) are responsible for identifying and contacting the copyright owner for permission to reuse. University at Buffalo Libraries do not manage rights for copyright-protected works and cannot assist with permissions.","Copyright retained by author."],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/10477/86672","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Bird, Jonathan","Physics"]},{"key":"dc:creator","label":"Author","values":["Arabchigavkani, Nargess; 0000-0003-1459-1051"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2025-02-21T21:36:18Z","2020"]},{"key":"dc:publisher","label":"Institution","values":["State University of New York at Buffalo"]},{"key":"dc:type","label":"Dc Type","values":["Text","Dissertation"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["physics","condensed matter physics","nanoscience"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Users of works found in University at Buffalo Institutional Repository (UBIR) are responsible for identifying and contacting the copyright owner for permission to reuse. University at Buffalo Libraries do not manage rights for copyright-protected works and cannot assist with permissions.","Copyright retained by author."]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/10477/86672"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Ph.D.","In this thesis, we investigate quantum transport in graphene under nonequilibrium conditions, focusing both on the behavior exhibited by native graphene, and by heterostructures of graphene and a ferromagnetic metal. Differential conductance mapping is used to probe the quan-tum corrections to the conductance of graphene at low temperatures (3-50 K). Weak-localization (WL) effects, which depend strongly on temperature, are observed as a result of coherent transport in graphene devices, realized on both SiO2 and hexagonal bornon nitride(h-BN) substrates. The WL is manifested in bare graphene samples as a dip around zero bias in the differential conductance map. The application of a bias voltage leads to dephasing of the carriers and suppression of this WL. By plotting the bias-induced change of differential con-ductance as a function of the dimensionless voltage (eV/kBT), we find that all data collapse onto a universal, temperature-independent form. According to this, the linear conductance remains approximately unchanged for voltages eV < kBT, before crossing over to a logarithmic function of V at larger voltages, reflecting the quenching of the quantum corrections. By implementing graphene/ferromagnetic hybrid structures in a \"polarizer-analyzer\" geometry, we map the differential conductance with and without the ferromagnetic polarizer included in the current path. Symmetry breaking spin-orbit coupling is induced in graphene charge carriers by the ferro-magnetic polarizer, and is maintained through several micrometers of transport within the graphene channel. This leads to the manifestation of weak anti-localization away from the polarizer. This effect, which depends strongly and non-monotonically on carrier concentration, is ob-served as an increase in the conductance of the analyzer, emerging as structured peaks near zero-bias in the conductance map. These results therefore demonstrate the manner in which transport in graphene may be strongly impacted by non-locally induced spin-orbit coupling.","**To request an accessible version of the file(s) associated with this item, contact library@buffalo.edu. Please include the item's persistent URL [http://hdl.handle.net/. . .] in your request.**"]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Magnetic Proximity Effects in Hybrid Graphene/Ferromagnetic Systems"]}]}],"canonical_facts":{"dc:contributor":["Bird, Jonathan","Physics"],"dc:creator":["Arabchigavkani, Nargess; 0000-0003-1459-1051"],"dc:date":["2025-02-21T21:36:18Z","2020"],"dc:description":["Ph.D.","In this thesis, we investigate quantum transport in graphene under nonequilibrium conditions, focusing both on the behavior exhibited by native graphene, and by heterostructures of graphene and a ferromagnetic metal. Differential conductance mapping is used to probe the quan-tum corrections to the conductance of graphene at low temperatures (3-50 K). Weak-localization (WL) effects, which depend strongly on temperature, are observed as a result of coherent transport in graphene devices, realized on both SiO2 and hexagonal bornon nitride(h-BN) substrates. The WL is manifested in bare graphene samples as a dip around zero bias in the differential conductance map. The application of a bias voltage leads to dephasing of the carriers and suppression of this WL. By plotting the bias-induced change of differential con-ductance as a function of the dimensionless voltage (eV/kBT), we find that all data collapse onto a universal, temperature-independent form. According to this, the linear conductance remains approximately unchanged for voltages eV < kBT, before crossing over to a logarithmic function of V at larger voltages, reflecting the quenching of the quantum corrections. By implementing graphene/ferromagnetic hybrid structures in a \"polarizer-analyzer\" geometry, we map the differential conductance with and without the ferromagnetic polarizer included in the current path. Symmetry breaking spin-orbit coupling is induced in graphene charge carriers by the ferro-magnetic polarizer, and is maintained through several micrometers of transport within the graphene channel. This leads to the manifestation of weak anti-localization away from the polarizer. This effect, which depends strongly and non-monotonically on carrier concentration, is ob-served as an increase in the conductance of the analyzer, emerging as structured peaks near zero-bias in the conductance map. These results therefore demonstrate the manner in which transport in graphene may be strongly impacted by non-locally induced spin-orbit coupling.","**To request an accessible version of the file(s) associated with this item, contact library@buffalo.edu. Please include the item's persistent URL [http://hdl.handle.net/. . .] in your request.**"],"dc:format":["application/pdf"],"dc:identifier":["http://hdl.handle.net/10477/86672"],"dc:language":["eng"],"dc:publisher":["State University of New York at Buffalo"],"dc:rights":["Users of works found in University at Buffalo Institutional Repository (UBIR) are responsible for identifying and contacting the copyright owner for permission to reuse. University at Buffalo Libraries do not manage rights for copyright-protected works and cannot assist with permissions.","Copyright retained by author."],"dc:subject":["physics","condensed matter physics","nanoscience"],"dc:title":["Magnetic Proximity Effects in Hybrid Graphene/Ferromagnetic Systems"],"dc:type":["Text","Dissertation"]},"updated_at":"2026-07-27T19:05:34Z"}