Electronic and spin control in functional oxide heterostructures

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dc.contributor.advisorMüller, Martina
dc.contributor.authorHinz, Ronja Anika
dc.contributor.refereeWestphal, Carsten
dc.date.accepted2021-03-18
dc.date.accessioned2021-08-19T06:50:31Z
dc.date.available2021-08-19T06:50:31Z
dc.date.issued2021
dc.description.abstractTransition metal oxides exhibit a variety of physical properties due to their high tunability of spin, orbital, and charge degrees of freedom. This thesis studies two complex, transition metal oxide thin film/substrate systems, the NiFe2O4/Nb:SrTiO3 (NFO/STO) and the La0.3Sr0.7MnO3/Nb:SrTiO3 (LSMO/ STO). NFO is a ferrimagnetic insulator. LSMO is a ferromagnetic half metal and below a critical thickness transitions to an insulator. However, the physical properties of those complex oxides heterostructures are often directly linked to the quality of the thin oxide film and the interactions between the oxide thin film and its substrate at the interface. In this thesis the ultra thin NFO film growth via pulsed laser deposition is optimized. First those optimized, smooth and single crystalline NFO films are studied with lab measurement methods to ensure a high film quality. In a next step their stoichiometry and crystalline occupancy is studied via hard X-ray photoemission (HAXPES) and X-ray absorption spectroscopy, which were recorded at the large scale synchrotron BESSY II, PETRA III and the DIAMOND Light source. The stoichiometry and occupancy is found to match the theoretical expectations of the NFO oxide in the inverse spinel structure. The magnetic response of the NFO/STO heterostructure is researched with the element selective X-ray magnetic circular dichroism (XMCD). Due to the proximity effect the Ti signal mimics the ferrimagnetic response of the NFO thin film. The electronic properties of Au/NFO/STO and Pt/LSMO/STO devices were investigated via in-operando HAXPES measurements. In-operando HAXPES is recording HAXPES spectra during a voltage is applied to the sample. The band alignment and band bending are investigated by applying Kraut' s method to the HAXPES spectra.en
dc.identifier.urihttp://hdl.handle.net/2003/40475
dc.identifier.urihttp://dx.doi.org/10.17877/DE290R-22350
dc.language.isoende
dc.subjectNiFe2O4en
dc.subjectSrTiO3en
dc.subjectLSMOen
dc.subjectOxideen
dc.subjectHeterostructureen
dc.subjectOxide thin filmsen
dc.subjectPLDen
dc.subjectXASen
dc.subjectXMCDen
dc.subjectIn-Operando HAXPESen
dc.subjectBand alignmenten
dc.subjectBand bendingen
dc.subjectInterface magnetismen
dc.subject.ddc530
dc.subject.rswkNickelde
dc.subject.rswkFerritede
dc.subject.rswkStrontiumtitanatde
dc.subject.rswkOxidede
dc.subject.rswkHeterostrukturde
dc.subject.rswkDünne Schichtde
dc.subject.rswkImpulslaserbeschichtende
dc.subject.rswkRöntgenabsorptionsspektroskopiede
dc.subject.rswkMagnetischer Röntgenzirkulardichroismusde
dc.subject.rswkRöntgen-Photoelektronenspektroskopiede
dc.subject.rswkBandstrukturde
dc.subject.rswkMagnetismusde
dc.titleElectronic and spin control in functional oxide heterostructuresen
dc.typeTextde
dc.type.publicationtypedoctoralThesisde
dcterms.accessRightsopen access
eldorado.secondarypublicationfalsede

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Experimentelle Physik I