Browsing Fakultät für Physik (inkl. GAUSS) by Advisor & Referee "Jooß, Christian Prof. Dr."
Now showing items 21-40 of 40
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Transmission electron microspy studies of ion migration in resistive switching platinum-manganite heterostructures
(2018-04-16)Non-volatile resistance change under electric stimulation in many metal-oxides is a promising path to next generation memory devices. However, the underlying mechanisms are still not fully understood. In this study ... -
In Situ X-ray Spectroscopy and Environmental TEM Study on Manganite Water Oxidation Catalysts
(2017-11-29)This thesis presents in situ studies on the active states of manganite water oxidation catalysts in water vapor. The study in chapter 2 probes the surface electronics of the strongly correlated Pr1-xCaxMnO3 (0Hybrid systems of molecular ruthenium catalyst anchored on oxide films for water oxidation: Functionality of the interface
(2017-11-03)The scope of the presented thesis is the realization and detailed analysis of a hybrid system for photoelectrochemical watersplitting with La$_{0.6}$Sr$_{0.4}$MnO$_3$ (LSMO) as photoabsorber and immobilized molecular ...Gestaltung der elektronischen Korrelationen in Perowskit-Heterostrukturen auf atomarer Skala
(2016-01-19)For the deposition of high quality heterostructures consisting of transition metal perovskites a new system for metalorganic aerosol deposition with growth control by in-situ ellipsometry was developed. By numerical ...Elektrischer Transport und remanentes Widerstandsschalten in \(Pt-Pr_{0.7}Ca_{0.3}MnO_3-Pt\) Sandwichstrukturen
(2015-12-07)This work investigates voltage pulse induced changes in the electrical resistance of praseodymium- calcium- manganite (PCMO). Either chemical or pure structural changes in the PCMO are suggested as possible mechanisms for ...Pr$_{1-x}$Ca$_x$MnO$_x$ for Catalytic Water Splitting - Optical Properties and In Situ ETEM Investigations
(2015-09-17)In this thesis, Ca-doped PrMnO$_3$ (PCMO) is evaluated as a catalyst for (photo)electrochemical water oxidation. The investigations are focused on elementary steps of the overall process. First, the optical absorption in ...Zusammenspiel von Ladungs-, Gitter- und magnetischen Ordnungen in hochdotierten LCMO Schichten
(2015-07-27)This work is focused on the preparation and characterization of overdoped La_1-xCa_xMnO_3 films on MgO and as freestanding films. The charge ordering transition is being investigated via means of resistance, magnetization, ...Kationen-Ordnung in ferri/ferromagnetischen perowskitischen Dünnfilmen
(2015-07-27)A major obstacle to the applicability of oxide perovskites in electrical or spintronic applications is the size of the specific temperatures at which the physical phenomena such as ferromagnetism or high-temperature ...Spindynamik in Tunnelelementen mit senkrechter magnetischer Anisotropie
(2015-02-11)During the last thirty years the memory space per square centimeter on the memory unit was increased exponential. The reason for such strong improvement is the continuous decreasing of the unit cells down to nanometer ...Metal Impurity Redistribution in Crystalline Silicon for Photovoltaic Application
(2014-11-14)Multicrystalline silicon, which is among the most common materials for solar cells [3], contains extended defects like grain boundaries and dislocations and a high amount of metal impurities potentially reducing the solar ...Hochauflösende mikroskopische und spektroskopische Untersuchungen zur strukturellen Ordnung an MgO-CoFeB-Grenzflächen
(2014-11-04)Magnetic tunnel junctions (MTJ), with crystalline MgO tunnel barrier sandwiched between amorphous CoFeB electrodes, received much attention due to their high tunnel magneto resistance (TMR) and flexible integration into ...Untersuchung der elektrischen Hyperfeinwechselwirkung in M<sub>n+1</sub>AX<sub>n</sub>-Phasen mittels der gestörten γ-γ-Winkelkorrelation
(2014-05-19)Mn+1AXn phases are thermodynamically stable nanolaminated ternary carbides and nitrides showing both metallic and ceramic properties. The letter M stands for an early transition metal, the letter A represents an A-element ...The tunnel magneto-Seebeck effect in magnetic tunnel junctions
(2014-01-30)The present (cumulative) thesis focusses on thermomagnetoelectric effects in magnetic tunnel junctions. In particular, it deals with the measurement of the tunnel magneto-Seebeck (TMS) effect in tunnel junctions incorporating ...Electrical characterization of conductive ion tracks in tetrahedral amorphous carbon with copper impurities
(2014-01-10)The irradiation of tetrahedral amorphous carbon (ta-C) with swift heavy ions leads to the formation of conductive microscopic ion tracks with diameters of about 10 nm. This phenomena depends on the sp² to sp³ hybridization-ratio ...Photo-magnonics in two-dimensional antidot lattices
(2013-01-11)The essential subject of the present (cumulative) thesis is the all-optical generation and detection as well as the systematic manipulation of magnetic excitations, so-called spin waves or magnons. In particular, the ...Untersuchung des elektrischen Widerstandsschaltens perowskitischer Manganatfilme auf der Nanometerskala
(2012-07-25)Perovskite manganese oxides are highly correlated systems, which exhibit a variety of resistance effects under different stimuli. Under exceeding critical voltages or currents, abrupt changes of the electrical resistance ...Künstliche und selbstorganisierte Nanokomposite basierend auf oxidischen Verbindungen
(2011-10-25)Due to the large amount of phase and grain boundaries as well as the small length scales, highly efficient transport phenomena and coupling effects may occur in nano composite materials ...Magnetoelektrische Eigenschaften von Manganat-Titanat Übergittern
(2010-01-28)Magnetoelectric multiferroics are materials in which the order phenomena ferromagnetism and ferroelectricity coexist. Due to pronounced magnetic as well as electric susceptibility, this ...Defektabhängige Transporteigenschaften von Praseodym-Kalzium-Manganat
(2009-11-24)Highly correlated electron-systems are characterised by a tight connection between the structure and the transport properties. This work investigates praseodymium calcium magnates (PCMO), ...Wechselwirkungen von Gold und Versetzungen in Silizium
(2009-06-04)The knowledge about interactions of different defects in crystalline sillicon are of major importance for the optimisation of the performance of solar cells based on multicrystalline silicon. ...