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000133358 020__ $$a978-3-89336-855-6
000133358 037__ $$aFZJ-2013-01835
000133358 041__ $$aEnglish
000133358 1001_ $$0P:(DE-Juel1)VDB73944$$aSchumacher, Daniel$$b0$$eCorresponding author$$gmale$$ufzj
000133358 245__ $$aInterplay between magnetic and dielectric phenomena at transition metal oxide interfaces
000133358 260__ $$aJülich$$bForschungszentrum Jülich GmbH Zentralbibliothek, Verlag$$c2013
000133358 300__ $$aIV, 127 S.
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000133358 4900_ $$0PERI:(DE-600)2445293-2$$aSchriften des Forschungszentrums Jülich. Schlüsseltechnologien / Key Technologies$$v56
000133358 502__ $$d2012
000133358 500__ $$3POF3_Assignment on 2016-02-29
000133358 520__ $$aThe present work is concerned with the preparation, characterzation and analysis of thin film heterostructures of perovskite oxide materials. Two different systems have been analyzed in detail: La$_{0.66}$Sr$_{0.33}$MnO$_{3}$/SrTiO$_{3}$ (LSMO/STO) heterostructures have been investigated in order to understand the unusual occurrence of an exchange bias effect in multilayers of these two oxides [1]. Monocrystalline LSMO single and LSMO/STO bilayers have been grown on STO by both High Osygen Pressure Sputter Deposition (HSD) and Pulsed Laser Deposition. It was possible to reproduce the Exchange Bias effect in the samples grown by HSD by reducing the oxygen pressure during the layer growth. In fact, the size of the effect can be increased by further reduction of the oxygen pressure. The macroscopic sample analysis by X-ray Diffraction and Vibrating Sample Magnetometry suggests that the occurence of the Exchange Bias effect is linked to oxygen deficiencies in the LSMO layer. By combining X-ray Reflectometry, Polarized Neutron Reflectometry and X-ray Resonant magnetic Scattering (XRMS), the magnetic depth profile of the samples has been determined. By this, a region in LSMO at the interface to STO has been detected, where the magnetic moment is strongly suppressed. By putting together the results of the macroscopic sample analysis and the scattering experiments, an explanation for the occurence of the effect can be given: It is roposed, that a combination of strain and oxygen deficiencies shifts the LSMO at the interface in the antiferromagnetic phase of the LSMO strain vs. doping phase diagram. This interface region thus couples to the ferromagnetic part of the LSMO causing the Exchange BIAS effect. The second heterostructure system under investigation in this work are bilayers of La$_{0.5}$Sr$_{0.5}$MnO$_{3}$ (LSMO) and BaTiO$_{3}$ (BTO).  possible dependence of the interface near magnetic structure [...]
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