Dokumente Fakultät für Physik (inkl. GAUSS) nach Gutachter "Samwer, Konrad Prof. Dr."
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Anti-aging and avalanche dynamics in ultrastable metallic glasses by X-ray photon correlation spectroscopy
(2024-04-23)Within this thesis, structural relaxation dynamics of vapour deposited as well as conventionally produced metallic glasses are studied. Vapour deposition enables to crucially tune the surface diffusion during the deposition ... -
Atomic-scale transport in graphene: the role of localized defects and substitutional doping
(2017-11-29)In this thesis scanning probe techniques are used to study the transport properties of epitaxial-grown graphene on SiC on a local scale. It moreover focusses on the role of one-dimensional growth defects such as steps and ... -
Avalanche Dynamics and Magnetoelastic Coupling in Metallic Glasses
(2018-02-19)This work is devoted to the study of the magnetoelastic coupling in metallic glasses. Such study is done by means of the statistical analysis of the intermittency of the deformation signal yield as a consequence of a ... -
Beeinflussung des Wachstums von Metall auf Polymer durch die gepulste Laserdeposition
(2014-03-24)Nowadays, fabrication of embedded metal particles in dielectric matrices plays an important role for technical devices, e.g. data storage, sensors or enhancement of efficiency of solar cells. In this work, metal nanoparticles ... -
Charakterisierung und Optimierung von Diffusionsbarrieren auf der Basis metallischer Oxidschichten
(2002-02-18)Reactively sputtered metallic Iridium dioxide (IrO2) thin films have been characterized and optimized for their application as diffusion barriers for the integration of ferroelectric oxidic ... -
Dünne Palladium-Wasserstoff-Schichten als Modellsystem: Thermodynamik struktureller Phasenübergänge unter elastischen und mikrostrukturellen Zwangsbedingungen
(2015-07-07)Using the formation of a hydride phase in palladium-hydrogen thin films with 5 nm to 2000 nm thickness as a model, this work investigates the impact of film thickness as well as microstructural and elastic constraints on ... -
Elektrischer Transport in Manganatschichten: Einfluss von elektrischen Feldern und Licht
(2013-07-15)In manganites a small change of external fields can lead to drastically changed electronic, magnetic, and structural properties. In this work the influence of electric fields and light on manganite films is studied. Through ... -
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 ... -
Das elektrochemische Potential auf der atomaren Skala: Untersuchung des Ladungstransports eines stromtragenden zweidimensionalen Elektronengases mit Hilfe der Raster-Tunnel-Potentiometrie
(2009-01-09)This thesis reports on the investigation of charge transport through a two-dimensional electron gas of the Si(111)(√3x√3)-Ag reconstruction as a prototype of electrical conductors by means of Scanning Tunneling Potentiometry ... -
From Slow to Ultra-fast MAS: Structural Determination of Type-Three Secretion System Bacterial Needles and Inorganic Materials by Solid-State NMR
(2014-12-16)This work on solid-state NMR methodologies and applications is divided in three parts. In the first part, three methods for solid-state NMR at ultra-fast Magic-Angle Spinning (MAS) are introduced: completely low-power ... -
Hydrogen absorption property of nanocrystalline-magnesium films
(2016-11-07)The purpose of this study is to investigate hydrogen absorption properties of grain boundary rich pure magnesium film. X-ray diffraction (XRD) measurements has been carried out to estimate microstructures, texture, lattice ... -
Laserinduzierte Änderungen der elektronischen Transporteigenschaften von Manganaten
(2017-07-31)This thesis investigates the influence of local excitations by ultra-short laser pulses in strongly correlated manganites. It focuses on the nonlinear transport properties which are connected to the correlations between ... -
Lichtinduzierte magnetische Defekte in ultradünnen Filmen
(2018-02-09)Topological defects such as domain walls, vortices or skyrmions in magnetic layers, exhibit promising properties which make them especially interesting for future applications in information technology. This work examines ... -
Löslichkeit und Diffusion von Wasserstoff in dünnen Schichten amorpher ZrTiNiCuBe- und ZrAlNiCu-Legierungen
(2003-02-12)In this work the solubility of hydrogen in amorphous alloys consisting of more than two elements is investigated theoretically as well as experimentaly. By modelling, the asumption is made ... -
Mechanical spectroscopy of polymers with reduced dimensions and increasing cross-linking degree
(2006-07-10)The effect of reduced dimensions and increasing cross-linking degree on dynamics of polymer chains near the glass transition temperature, Tg, have been studied by means of the Vibrating ... -
Mechanische Eigenschaften kristallin-amorpher Schichtpakete
(2013-01-11)Micromechanical characterization by Berkovich nanoindentation and uniaxial microcompression tests has been performed on multilayered films consisting of three different material combinations - Ti/ZrO2, Cu/PdSi und Cu/PC – ... -
Mechanische Spannungen und Mikrostruktur dünner TiNi- und Ti50Ni50-xCux-Formgedächtnisschichten
(2004-05-05)This thesis describes the fabrication process of TiNi and Ti50Ni50-xCux shape memory thin films by means of cocondensation via electron beam evaporation in UHV and their characterisation. During film growth and martensitic ... -
Mechanische Spektroskopie an PMMA-Systemen: Nichtlineares Verhalten und UV-aktive Blockcopolymere
(2017-03-16)This thesis focuses on two different topics. Firstly the occurence of nonlinear higher harmonic contributions in the mechanical response of polymethylmethacrylate (PMMA) is investigated with dynamic mechanical analysis. ... -
Mechanismen und Größeneffekte von Ermüdungsschädigungen in dünnen Kupfer filmen bei sehr hohen Zyklenzahlen
(2013-05-17)Thin metal films show completely different fatigue behavior than bulk metals. The films have longer fatigue lives and instead of extrusions and complex dislocation structures, they form interface cracks and isolated ...