{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/117619"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/117619","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Neutron scattering investigations of spinel ferrimagnets: symmetry and magnetoelastic domain wall patterning","abstract":"Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-12-01","abstract_html":"Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-12-01","abstract_has_math":false,"creators":["Kish, Lazar L."],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["MacDougall, Gregory J","Cooper, Stephen L","Shoemaker, Daniel P","Stone, Michael"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2022,"date_issued":"2022-12","date_published":"2022-12","updated_at":"2026-07-22T22:24:56Z","subjects":["domain walls","domains","neutron scattering","SANS","small-angle neutron scattering","neutron diffraction","magnetic response","spinels","ferrimagnetism","Mn3O4","MnV2O4","FeV2O4"],"languages":["en","eng"],"rights":["Copyright 2022 Lazar Kish"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/2142/117619","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["MacDougall, Gregory J","Cooper, Stephen L","Shoemaker, Daniel P","Stone, Michael"]},{"key":"dc:creator","label":"Author","values":["Kish, Lazar L."]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2022-12","2022-08-08"]},{"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":["domain walls","domains","neutron scattering","SANS","small-angle neutron scattering","neutron diffraction","magnetic response","spinels","ferrimagnetism","Mn3O4","MnV2O4","FeV2O4"]}]},{"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 2022 Lazar Kish"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://hdl.handle.net/2142/117619"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-12-01","The student, Lazar Kish, accepted the attached license on 2022-07-27 at 12:08.","The student, Lazar Kish, submitted this Dissertation for approval on 2022-07-27 at 12:28.","This Dissertation was approved for publication on 2022-08-08 at 10:34.","DSpace SAF Submission Ingestion Package generated from Vireo submission #18437 on 2023-04-12 at 08:09:57","The interplay and coupling of distinct order parameters, such as between magnetic order and superconductivity in cuprates or between spin and lattice distortions in type-II multiferroics present some of the most complex problems in condensed matter physics and materials science. Even in situations where the local physics behind such couplings is well described, unexpected behaviors can arise on the mesoscale where local symmetries are broken by defects such as domain-walls, which are ubiquitous features of ordered phases. My thesis work involves an extended series of neutron and X-ray diffraction and thermodynamic measurements on ferrimagnetic spinel materials (Mn3O4 , MnV2O4 , FeV2O4). These materials are known for strong couplings between spin and lattice degrees of freedom which give rise to giant magnetoelastic and magnetodielectric couplings. Chapter 3 reports on a strain-induced nanoscale patterning of magnetoelastic domain walls in the bulk of single crystals of Mn3O4 and MnV2O4 . The domain-walls are observable using small-angle neutron scattering, which allows us to track their organizational behavior as a function of temperature and applied magnetic field. As I demonstrate with parallel single-crystal neutron diffraction and macroscopic measurements, the response of these domain wall patterns to environmental stress and applied magnetic fields greatly influences the large-scale magnetostrictive and magnetodielectric behaviors. Chapter 4 reports on the discovery of a coherent superstructure modulation in MnV2O4 which develops at the same magnetic transitions as the stripe domains. I will also present my work on the spinel multiferroic FeV2O4 , which has a cascade of low-temperature magnetic and structural transitions. Diffraction results in Chapter 5 imply that the high-temperature space-group of this material may need to be reinterpreted. As Chapter 6 shows, small-angle neutron scattering and neutron diffraction uncover increasingly complex mesoscopic behaviors in this material as symmetries are progressively reduced for each low-temperature phase."]},{"key":"dc:format","label":"Dc Format","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Neutron scattering investigations of spinel ferrimagnets: symmetry and magnetoelastic domain wall patterning"]}]}],"canonical_facts":{"dc:contributor":["MacDougall, Gregory J","Cooper, Stephen L","Shoemaker, Daniel P","Stone, Michael"],"dc:creator":["Kish, Lazar L."],"dc:date":["2022-12","2022-08-08"],"dc:description":["Submission published under a 24 month embargo labeled 'U of I Access', the embargo will last until 2024-12-01","The student, Lazar Kish, accepted the attached license on 2022-07-27 at 12:08.","The student, Lazar Kish, submitted this Dissertation for approval on 2022-07-27 at 12:28.","This Dissertation was approved for publication on 2022-08-08 at 10:34.","DSpace SAF Submission Ingestion Package generated from Vireo submission #18437 on 2023-04-12 at 08:09:57","The interplay and coupling of distinct order parameters, such as between magnetic order and superconductivity in cuprates or between spin and lattice distortions in type-II multiferroics present some of the most complex problems in condensed matter physics and materials science. Even in situations where the local physics behind such couplings is well described, unexpected behaviors can arise on the mesoscale where local symmetries are broken by defects such as domain-walls, which are ubiquitous features of ordered phases. My thesis work involves an extended series of neutron and X-ray diffraction and thermodynamic measurements on ferrimagnetic spinel materials (Mn3O4 , MnV2O4 , FeV2O4). These materials are known for strong couplings between spin and lattice degrees of freedom which give rise to giant magnetoelastic and magnetodielectric couplings. Chapter 3 reports on a strain-induced nanoscale patterning of magnetoelastic domain walls in the bulk of single crystals of Mn3O4 and MnV2O4 . The domain-walls are observable using small-angle neutron scattering, which allows us to track their organizational behavior as a function of temperature and applied magnetic field. As I demonstrate with parallel single-crystal neutron diffraction and macroscopic measurements, the response of these domain wall patterns to environmental stress and applied magnetic fields greatly influences the large-scale magnetostrictive and magnetodielectric behaviors. Chapter 4 reports on the discovery of a coherent superstructure modulation in MnV2O4 which develops at the same magnetic transitions as the stripe domains. I will also present my work on the spinel multiferroic FeV2O4 , which has a cascade of low-temperature magnetic and structural transitions. Diffraction results in Chapter 5 imply that the high-temperature space-group of this material may need to be reinterpreted. As Chapter 6 shows, small-angle neutron scattering and neutron diffraction uncover increasingly complex mesoscopic behaviors in this material as symmetries are progressively reduced for each low-temperature phase."],"dc:format":["application/pdf"],"dc:identifier":["https://hdl.handle.net/2142/117619"],"dc:language":["en","eng"],"dc:rights":["Copyright 2022 Lazar Kish"],"dc:subject":["domain walls","domains","neutron scattering","SANS","small-angle neutron scattering","neutron diffraction","magnetic response","spinels","ferrimagnetism","Mn3O4","MnV2O4","FeV2O4"],"dc:title":["Neutron scattering investigations of spinel ferrimagnets: symmetry and magnetoelastic domain wall patterning"],"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":"2026-07-22T22:24:56Z"}