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000808753 0247_ $$2Handle$$a2128/12364
000808753 0247_ $$2ISSN$$a1866-1807
000808753 020__ $$a978-3-95806-162-0
000808753 037__ $$aFZJ-2016-02374
000808753 041__ $$aEnglish
000808753 1001_ $$0P:(DE-Juel1)141865$$aSteffen, Alexandra$$b0$$eCorresponding author$$gfemale$$ufzj
000808753 245__ $$aSelf-purifying La$_{2/3}$Sr$_{1/3}$MnO$_{3}$ epitaxial films: Observation of surface precipitation of Mn$_{3}$O$_{4}$ particles for excess Mn ratios$$f- 2016-04-21
000808753 260__ $$aJülich$$bForschungszentrum Jülich GmbH Zentralbibliothek, Verlag$$c2016
000808753 300__ $$a154 S.
000808753 3367_ $$2DataCite$$aOutput Types/Dissertation
000808753 3367_ $$2ORCID$$aDISSERTATION
000808753 3367_ $$2BibTeX$$aPHDTHESIS
000808753 3367_ $$02$$2EndNote$$aThesis
000808753 3367_ $$0PUB:(DE-HGF)11$$2PUB:(DE-HGF)$$aDissertation / PhD Thesis$$bphd$$mphd$$s1474877900_10943
000808753 3367_ $$2DRIVER$$adoctoralThesis
000808753 4900_ $$aSchriften des Forschungszentrums Jülich. Reihe Schlüsseltechnologien / Key Technologies$$v128
000808753 502__ $$aRWTH Aachen, Diss., 2016$$bDr.$$cRWTH Aachen$$d2016
000808753 520__ $$a20-25 nm thin films based La$_{2/3}$Sr$_{1/3}$MnO$_{3}$ (LSMO) are prepared via Oxide Molecular Beam Epitaxy setup (MBE). Different ways of effusion cell shutter opening intervals are used to produce samples in co-deposition and shuttered mode. In-situ Reflection High-Energy Electron Diffraction (RHEED) intensity measurements in dependence of evaporation time are performed. The RHEED intensities exhibit distinct oscillations, indicating a stacking of layers with a stoichiometry controlled by the shutter opening times, in particular of the La$_{2/3}$Sr$_{1/3}$O vs. MnO content. Inside the thin LSMO films, vertical stoichiometric constant and gradient structures are produced. Low Energy Electron Diffraction (LEED) and X-Ray Diffraction (XRD) exhibit the Bragg reflection sexpected for epitaxial growth of the thin films. XRR analysis is in agreement with the nominal layer thickness and composition. To determine the magnetic layer thickness and to see whether a magnetic gradient inside the structural gradient takes place, Polarized Neutron Reflectometry (PNR) measurements are performedand evaluated. The depth-dependent magnetization behavior does not render the anticipated sample structure. A combined refinement of XRR and PNR data requires MnOx excess towards the surfaces in the model of the scattering length density. Additional High-Resolution Transmission Electron Microscopy (HRTEM) images reveal the existence of pure homogeneous perovskite LSMO layers with enclaved MnOx precipitates. Detailed SQUID measurements indicate these particles to have a M$_{3}$O$_{4}$ stoichiometry. Due to the combination of different experimental methods, the difference between the nominal and the actual layer composition can be identified showing that LSMO prefers to grow in pure La$_{2/3}$Sr$_{1/3}$MnO$_{3}$ perovskite phase on SrTiO$_{3}$. The observation of this phase separation effect will be discussed.
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000808753 536__ $$0G:(DE-HGF)POF3-6212$$a6212 - Quantum Condensed Matter: Magnetism, Superconductivity (POF3-621)$$cPOF3-621$$fPOF III$$x2
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