{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/98089"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/98089","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Real-space magnetic imaging of the spinel MnV2O4","abstract":"Controlling multiferroic behavior in materials will enable the development of a wide variety of technological applications. However, the exact mechanisms by which multiferroic behavior arises in many materials are not well understood. One such class of materials are the spinels, including MnV2O4. Bulk probe studies of this compound have yielded conflicting and inconclusive results. To inform the debate and better understand the underlying physics, we performed magnetic force microscopy measurements on two MnV2O4 samples with differing degrees of mechanical strain. These local investigations revealed sub-um-scale patterns in the magnetic structure in both samples. In one case, the magnetization of these stripes is estimated at Mz ~ 10^5 A/m, which is on the order of previous saturation magnetization measurements. The discovery of such large inhomogeneities necessitates revision of theoretical proposals and reinterpretation of experimental data regarding the low-temperature phases of the spinels. Similar MFM measurements of a related material (Mn3O4) provide evidence that magnetic inhomogeneity is a common feature in the magnetically ordered phases of multiferroic spinel compounds.","abstract_html":"Controlling multiferroic behavior in materials will enable the development of a wide variety of technological applications. However, the exact mechanisms by which multiferroic behavior arises in many materials are not well understood. One such class of materials are the spinels, including MnV2O4. Bulk probe studies of this compound have yielded conflicting and inconclusive results. To inform the debate and better understand the underlying physics, we performed magnetic force microscopy measurements on two MnV2O4 samples with differing degrees of mechanical strain. These local investigations revealed sub-um-scale patterns in the magnetic structure in both samples. In one case, the magnetization of these stripes is estimated at Mz ~ 10^5 A/m, which is on the order of previous saturation magnetization measurements. The discovery of such large inhomogeneities necessitates revision of theoretical proposals and reinterpretation of experimental data regarding the low-temperature phases of the spinels. Similar MFM measurements of a related material (Mn3O4) provide evidence that magnetic inhomogeneity is a common feature in the magnetically ordered phases of multiferroic spinel compounds.","abstract_has_math":false,"creators":["Wolin, Brian Augustus"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Budakian, Raffi","Cooper, Lance","Martinez Outschoorn, Verena","Clark, Bryan"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2017,"date_issued":"2017-09-29T16:37:41Z","date_published":"2017-09-29T16:37:41Z","updated_at":"2026-07-22T22:24:34Z","subjects":["Spinel","Spinels","Multiferroic","multiferroics","multiferroism","Magnetic force microscopy (MFM)","MnV2O4","Magnetic imaging","Strain","Quantitative magnetic force microscopy (MFM)"],"languages":["en"],"rights":["Copyright 2017 Brian Wolin"],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/98089","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Budakian, Raffi","Cooper, Lance","Martinez Outschoorn, Verena","Clark, Bryan"]},{"key":"dc:creator","label":"Author","values":["Wolin, Brian Augustus"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2017-09-29T16:37:41Z","2017-05-01","2017-08"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"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":["Spinel","Spinels","Multiferroic","multiferroics","multiferroism","Magnetic force microscopy (MFM)","MnV2O4","Magnetic imaging","Strain","Quantitative magnetic force microscopy (MFM)"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2017 Brian Wolin"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/98089"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Controlling multiferroic behavior in materials will enable the development of a wide variety of technological applications. However, the exact mechanisms by which multiferroic behavior arises in many materials are not well understood. One such class of materials are the spinels, including MnV2O4. Bulk probe studies of this compound have yielded conflicting and inconclusive results. To inform the debate and better understand the underlying physics, we performed magnetic force microscopy measurements on two MnV2O4 samples with differing degrees of mechanical strain. These local investigations revealed sub-um-scale patterns in the magnetic structure in both samples. In one case, the magnetization of these stripes is estimated at Mz ~ 10^5 A/m, which is on the order of previous saturation magnetization measurements. The discovery of such large inhomogeneities necessitates revision of theoretical proposals and reinterpretation of experimental data regarding the low-temperature phases of the spinels. Similar MFM measurements of a related material (Mn3O4) provide evidence that magnetic inhomogeneity is a common feature in the magnetically ordered phases of multiferroic spinel compounds.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2017-09-29 without embargo terms","The student, Brian Wolin, accepted the attached license on 2017-04-24 at 14:15.","The student, Brian Wolin, submitted this Dissertation for approval on 2017-04-24 at 14:19.","This Dissertation was approved for publication on 2017-05-01 at 13:29.","DSpace SAF Submission Ingestion Package generated from Vireo submission #11005 on 2017-09-29 at 11:25:29","Made available in DSpace on 2017-09-29T16:37:41Z (GMT). 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However, the exact mechanisms by which multiferroic behavior arises in many materials are not well understood. One such class of materials are the spinels, including MnV2O4. Bulk probe studies of this compound have yielded conflicting and inconclusive results. To inform the debate and better understand the underlying physics, we performed magnetic force microscopy measurements on two MnV2O4 samples with differing degrees of mechanical strain. These local investigations revealed sub-um-scale patterns in the magnetic structure in both samples. In one case, the magnetization of these stripes is estimated at Mz ~ 10^5 A/m, which is on the order of previous saturation magnetization measurements. The discovery of such large inhomogeneities necessitates revision of theoretical proposals and reinterpretation of experimental data regarding the low-temperature phases of the spinels. Similar MFM measurements of a related material (Mn3O4) provide evidence that magnetic inhomogeneity is a common feature in the magnetically ordered phases of multiferroic spinel compounds.","Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2017-09-29 without embargo terms","The student, Brian Wolin, accepted the attached license on 2017-04-24 at 14:15.","The student, Brian Wolin, submitted this Dissertation for approval on 2017-04-24 at 14:19.","This Dissertation was approved for publication on 2017-05-01 at 13:29.","DSpace SAF Submission Ingestion Package generated from Vireo submission #11005 on 2017-09-29 at 11:25:29","Made available in DSpace on 2017-09-29T16:37:41Z (GMT). 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