Browsing Fakultät für Physik (inkl. GAUSS) by Referee "Samwer, Konrad Prof. Dr."
Now showing items 1-20 of 36
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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 ... -
Reibung kristalliner, amorpher und stark korrelierter Systeme unter aktiver Kontrolle
(2018-08-09)Mechanical and kinetic energy is transferred into heat if to two bodies slide on each other. This energy dissipative process is usually called friction. This thesis contributes to the understanding of friction. This is ... -
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 ... -
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 ... -
Nanotribologische Untersuchungen an Dünnschicht-Manganaten: Phononische Beiträge zur Reibung auf der Nanometerskala
(2018-01-31)Even though friction is often described by straight-forward empirical laws, its fundamental cause is by no means simple. Many of the fundamental excitations at the nanoscale contact are strongly coupled making it challenging ... -
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 ... -
Nonlinear Response and Avalanche Behavior in Metallic Glasses
(2017-08-29)The response to different stress amplitudes at temperatures below the glass transition temperature is measured by mechanical oscillatory excitation of Pd40Ni40P20 metallic glass samples in single cantilever bending geometry. ... -
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 ... -
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. ... -
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 ... -
Multilagenzonenplatten für die Mikroskopie mit harter Röntgenstrahlung
(2016-08-02)X-ray microscopy is due to the small wavelength and high penetration depth an auspicious technique for improved investigations of materials on nm-scale. For this, multilayer zone plates (MZP) with well-defined and smooth ... -
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 ... -
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 ... -
Thermodynamic and kinetic properties of metallic glasses during ultrafast heating
(2015-05-18)When a system is cooled from the high temperature liquid state below its liquidus temperature, the dynamics of the system start to deviate from the ones in the equilibrium high temperature liquid. There are a number of ... -
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 ... -
Spannungsinduzierte Wellenbildung in laserdeponierten Polymer/Metall-Systemen
(2014-07-24)Multilayer thin films with dimensions at the nanometer scale represent a technologically important class of materials where the interface and size effects play an important role. Interestingly, when polymer/metal multilayers ... -
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 ... -
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 ... -
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 ... -
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 – ...