{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/125577"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/125577","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Low-temperature magneto-transport study of topological insulator-magnetic material heterostructures","abstract":"Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-02-04 without embargo terms","abstract_html":"Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-02-04 without embargo terms","abstract_has_math":false,"creators":["Oh, Junseok"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Mason, Nadya","Lorenz, Virginia","Gilbert, Matthew","Hoffmann, Axel"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2024,"date_issued":"2024-07-10","date_published":"2024-07-10","updated_at":"2026-07-22T22:25:02Z","subjects":["Topological Insulator","Magnetoresistance"],"languages":["en","eng"],"rights":["Copyright 2024 Junseok Oh"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/2142/125577","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Mason, Nadya","Lorenz, Virginia","Gilbert, Matthew","Hoffmann, Axel"]},{"key":"dc:creator","label":"Author","values":["Oh, Junseok"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2024-07-10","2024-08"]},{"key":"dc:type","label":"Dc Type","values":["text","Thesis"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Physics"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Topological Insulator","Magnetoresistance"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en","eng"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2024 Junseok Oh"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://hdl.handle.net/2142/125577"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-02-04 without embargo terms","The student, Junseok Oh, accepted the attached license on 2024-07-08 at 00:56.","The student, Junseok Oh, submitted this Dissertation for approval on 2024-07-08 at 00:59.","This Dissertation was approved for publication on 2024-07-10 at 21:07.","DSpace SAF Submission Ingestion Package generated from Vireo submission #20974 on 2025-02-04 at 21:04:20","Topological insulators have been extensively investigated in the field of condensed matter physics. These materials represent a unique class characterized by insulating bulk states and topologically protected surface states, showcasing a strong coupling between momentum and spin. The integration of magnetism with topological insulators has garnered significant attention for potential applications in spintronics and quantum computing. This thesis delves into the examination of two material systems comprising topological insulator-magnetic material heterostructures using low-temperature magneto-transport techniques. The first system consists of a topological insulator, Bi2Se3, and a metallic ferromagnet, Co/Pt multilayer, featuring perpendicular magnetic anisotropy. Despite expectations that topological surface states may be annihilated due to band hybridization, various magnetoresistance phenomena are observed, notably the hysteretic square switching magnetoresistance below 1.3 K. Through comparison with magnetoresistance behaviors of the top ferromagnetic layer, this effect is attributed to induced magnetic ordering within the topological insulator. A proposed mechanism suggests involvement of spin-valve and skyrmions. In the second system, magnetoresistance in Bi2Se3 deposited on a ferrimagnetic insulator, Yttrium Iron garnet, is explored as a function of electrostatic gating. The dependence of magnetic anisotropy of the induced magnetization in the topological insulator on chemical potential is investigated. The experiment aims to manipulate the magnetic anisotropy of induced magnetic ordering through gating. Observed magnetoresistance responses indicate the potential for controlling magnetic anisotropy via gating mechanisms."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Low-temperature magneto-transport study of topological insulator-magnetic material heterostructures"]}]}],"canonical_facts":{"dc:contributor":["Mason, Nadya","Lorenz, Virginia","Gilbert, Matthew","Hoffmann, Axel"],"dc:creator":["Oh, Junseok"],"dc:date":["2024-07-10","2024-08"],"dc:description":["Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2025-02-04 without embargo terms","The student, Junseok Oh, accepted the attached license on 2024-07-08 at 00:56.","The student, Junseok Oh, submitted this Dissertation for approval on 2024-07-08 at 00:59.","This Dissertation was approved for publication on 2024-07-10 at 21:07.","DSpace SAF Submission Ingestion Package generated from Vireo submission #20974 on 2025-02-04 at 21:04:20","Topological insulators have been extensively investigated in the field of condensed matter physics. These materials represent a unique class characterized by insulating bulk states and topologically protected surface states, showcasing a strong coupling between momentum and spin. The integration of magnetism with topological insulators has garnered significant attention for potential applications in spintronics and quantum computing. This thesis delves into the examination of two material systems comprising topological insulator-magnetic material heterostructures using low-temperature magneto-transport techniques. The first system consists of a topological insulator, Bi2Se3, and a metallic ferromagnet, Co/Pt multilayer, featuring perpendicular magnetic anisotropy. Despite expectations that topological surface states may be annihilated due to band hybridization, various magnetoresistance phenomena are observed, notably the hysteretic square switching magnetoresistance below 1.3 K. Through comparison with magnetoresistance behaviors of the top ferromagnetic layer, this effect is attributed to induced magnetic ordering within the topological insulator. A proposed mechanism suggests involvement of spin-valve and skyrmions. In the second system, magnetoresistance in Bi2Se3 deposited on a ferrimagnetic insulator, Yttrium Iron garnet, is explored as a function of electrostatic gating. The dependence of magnetic anisotropy of the induced magnetization in the topological insulator on chemical potential is investigated. The experiment aims to manipulate the magnetic anisotropy of induced magnetic ordering through gating. Observed magnetoresistance responses indicate the potential for controlling magnetic anisotropy via gating mechanisms."],"dc:format":["application/pdf"],"dc:identifier":["https://hdl.handle.net/2142/125577"],"dc:language":["en","eng"],"dc:rights":["Copyright 2024 Junseok Oh"],"dc:subject":["Topological Insulator","Magnetoresistance"],"dc:title":["Low-temperature magneto-transport study of topological insulator-magnetic material heterostructures"],"dc:type":["text","Thesis"],"thesis:degree_discipline":["Physics"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["University of Illinois at Urbana-Champaign"]},"updated_at":"2026-07-22T22:25:02Z"}