Theoretical investigation of size effects in multiferroic nanoparticles

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dc.contributor.authorAllen, Marc Alexander
dc.contributor.supervisorde Sousa, Rogério Costa Reis
dc.date.accessioned2020-08-06T02:24:32Z
dc.date.available2020-08-06T02:24:32Z
dc.date.copyright2020en_US
dc.date.issued2020-08-05
dc.degree.departmentDepartment of Physics and Astronomyen_US
dc.degree.levelDoctor of Philosophy Ph.D.en_US
dc.description.abstractOver the last two decades, great progress has been made in the understanding of multiferroic materials, ones where multiple long-range orders simultaneously exist. However, much of the research has focused on bulk systems. If these materials are to be incorporated into devices, they would not be in bulk form, but would be miniaturized, such as in nanoparticle form. Accordingly, a better understanding of multiferroic nanoparticles is necessary. This manuscript examines the multiferroic phase diagram of multiferroic nanoparticles related to system size and surface-induced magnetic anisotropy. There is a particular focus on bismuth ferrite, the room-temperature antiferromagnetic-ferroelectric multiferroic. Theoretical results will be presented which show that at certain sizes, a bistability develops in the cycloidal wavevector. This implies bistability in the ferroelectric and magnetic moments of the nanoparticles. This novel magnetoelectric bistability may be of use in the creation of an electrically-written, magnetically-read memory element.en_US
dc.description.scholarlevelGraduateen_US
dc.identifier.urihttp://hdl.handle.net/1828/11972
dc.languageEnglisheng
dc.language.isoenen_US
dc.rightsAvailable to the World Wide Weben_US
dc.subjectbismuth ferriteen_US
dc.subjectbfoen_US
dc.subjectnanoparticleen_US
dc.subjectnanomagnetismen_US
dc.subjectmultiferroicsen_US
dc.subjectoptimizationen_US
dc.subjectmagnetismen_US
dc.subjectferroelectricen_US
dc.subjectbistabilityen_US
dc.subjectanisotropyen_US
dc.subjectsurface anisotropyen_US
dc.subjectweak ferromagnetismen_US
dc.subjectantiferromagnetismen_US
dc.subjectDzyaloshinskii-Moriya interactionen_US
dc.subjectcycloiden_US
dc.subjectnumerical methodsen_US
dc.subjectcondensed matteren_US
dc.subjectsolid state physicsen_US
dc.subjectmagnetoelectric effecten_US
dc.subjectroom-temperature multiferroicen_US
dc.subjectsuperexchangeen_US
dc.subjectmagnetic memoryen_US
dc.subjectspin cantingen_US
dc.subjectg-type antiferromagnetismen_US
dc.subjectHeisenberg Hamiltonianen_US
dc.subjectNelder-Meaden_US
dc.subjectL-BFGS-Ben_US
dc.subjectmathematicaen_US
dc.subjectpythonen_US
dc.subjectferroelectricityen_US
dc.subjectperovskiteen_US
dc.subjectantiferromagneten_US
dc.subjectbifeo3en_US
dc.subjectrhombohedralen_US
dc.subjectpseudocubicen_US
dc.subjectr3cen_US
dc.subjecttrigonalen_US
dc.subjectphysicsen_US
dc.subjectmagneticen_US
dc.subjectmemoryen_US
dc.subjectelectrically-written memoryen_US
dc.subjectcurie temperatureen_US
dc.subjectnéel temperatureen_US
dc.subjectmaterials scienceen_US
dc.titleTheoretical investigation of size effects in multiferroic nanoparticlesen_US
dc.typeThesisen_US

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