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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 39 for “"atomic layers"”.
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Synthesis and photo-response study on GaSe and InSe atomic layers
The two dimensional atomically layered materials are drawing intense attention in recent years, because of their special physical properties. Graphene, as a layered material with large charge carrier mobility, has been studied for years. Besides, graphene, large amounts of materials exhibit unique …
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Magnetische Strukturen in [Er/Tb]-Schichtsystemen : Einfluss der magnetischen Nachbarschaft und konkurrierender Anisotropien
Magnetic structures in [Er|Tb]-multilayers: Magnetic Proximity and competing anisotropies The present work concerns the influence of the artificial superstructure and competing anisotropies on the magnetic structure in [Er|Tb] superlattices. Combining neutron diffraction and resonance x-ray …
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The thermal boundary conductance between a thin ⁴He film and its substrate
… strength and Q for films between 1.35 and 4.40 atomic layers shows that the boundary conductance between a thin film and its substrate is three to five orders of magnitude smaller than the boundary conductance between bulk liquid helium and a solid. The conductance for the bulk case is the …
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Two-dimensional and three-dimensional magnetism in ultrathin epitaxial rare-earth metal films
… rare-earth element layer, between 0.1 and 10 atomic layers thick and magnetically separated from one another by thick spacers, is grown in layer-by-layer growth mode to insure high crystal quality. Magnetization of the resulting films is measured to identify the spin structures and the …
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Photoemission Studies of *Interface Effects on Thin Film Properties
… 3 x 3 /Si(111), films made of odd numbers of atomic layers are observed to be more stable than the even ones, but this trend is reversed for the other cases studied. For Pb/Au-6x6/Si(111), the maximum stability temperatures are in excess of room temperature, unlike the other systems. These …
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Ab initio calculations of the electronic properties of the nickel oxide surface
… calculations are presented for the adsorption of atomic oxygen onto the nickel oxide (100) surface. The perfect surface is shown to be non-reactive, but enhanced binding is found for vacancy sites in the first two atomic layers. Of particular interest are a first layer cation vacancy and a second …
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Computational Analysis of Silicon Nanoelectromechanical Systems
… properties are localized to within one or two atomic layers of the nanowire.
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Magnetic domain walls in ultrathin films : contribution of the Dzyaloshinsky-Moriya interaction
… W(110)-surface covered with one respectively two atomic layers of Fe. The domain-wall widths are calculated and compared with experimental data. Furthermore, a new explanation is given for the experimentally observed phenomenon, that the domain walls in the Fe double-layer are preferably oriented …
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Measurements of Vortex Diffusivity in 2d Superfluid Helium-4
… of coverage .25 < (sigma)(,s) < 1.9 superfluid atomic layers and with .55 < T(,KT) < 1.9(DEGREES)K. We use a third sound resonator combined with a new detection technique('17) which allows us to measure the vortex dynamics in the superfluid. Using a model developed by Gillis, et al('16,32), we …
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Spin-Bahn-Kopplung und zweidimensionale Zustände in ultradünnen, magnetischen Schichten
… between ferromagnetic and paramagnetic layers, in paramagneticoverlayers on ferromagnetic substrates, and of ferromagnetic bulk-likelayers itself. Especially, in these layer systems we were interested inhow the electronic structure is modified (a) by the spin-orbit coupling and (b) by a …
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The Effect of Lead on Dealloying and Stress Corrosion Cracking (SCC) of Ni-Cr-Fe Alloys in Boiling Caustic Environments
… Ni-rich surface formed after dealloying of a few atomic layers. Pb deposition blocked dissolution pathways which slowed dealloying kinetics and subsequently hindered SCC initiation in comparison to pure caustic conditions.
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Mechanics of deformation and fracture of silicon electrodes in high-capacity lithium-ion batteries
… and weakly bonded Si-Cu and Li-Cu crystalline atomic layers form within this interphase structure and then sliding can happen between the electrode and the current collector. This interfacial sliding will help release stresses introduced by the lithiation process. However, it can be terminated …
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Growth and magnetotransport studies of epitaxial graphene
… forming a surface layer consisting of a few atomic layers of graphitic carbon (graphene) arranged in known crystallographic register with the substrate material. The layers of graphene on the (0001) face form the subject of the thesis, and their surface morphology, crystallography and …
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An efficient full-potential linearized augmented plane wave electronic structure method for charge and spin transport through realistic nanoferronic junctions
… method, which allows to divide the system into atomic layers, which are then coupled by the embedding potential. Thus, this method is optimally suited for the description of open systems, such as surfaces and tunnel junctions. The order-N implementation allows to exploit the high precision of …
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Micromagnetic analysis of co-based magnetic nanostructures.
… of low anisotropy regions within the first few atomic layers of the sputtered film or anisotropy gradation throughout the grain thickness. Both explanations offer appropriate coercivity reductions; however, grains including anisotropy gradation display this effect at more realistic values of …
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Phase-Engineered Field-Effect Transistors Based on Two-Dimensional Transition Metal Dichalcogenides
… sandwiched between two chalcogen (S, Se, and Te) atomic layers. They can exist in either a semiconducting or metallic phase. Semiconducting TMDC based field-effect transistors (FETs) are considered promising candidates for post-Si electronics owing to their ultra-thin body enabling ultimate …
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Imaging Nanoscale Spin Textures with Scanning Diamond Quantum Microscopy
… and sensitivities down to single magnetic atomic layers, are becoming increasingly inaccessible by conventional spatial imaging techniques. In this respect, quantum sensing via nitrogen-vacancy centres in diamond promises to address contemporary and prospective imaging needs. Employed on a …
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Nadir toprak elementli bileşiklerin manyetik, yapısal ve termal karakterizasyonu
… in some compounds. This structure comprises the atomic layers stacked along the c-axis direction in the sequence R?X-T-X-R. With increasing x, lattice parameters and the unit cell volume have decreased linearly, obeying the Vegard?s law. 2The AC magnetic susceptibility as a function of …
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Photoemission studies of interface effects on thin film properties
… thickness of a metallic film decreases to the atomic scale, the confinement of the film's electrons by its boundaries gives rise to discrete electronic states, known as quantum well states, which dominate the film properties. This work investigates the use of film-substrate boundary …
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Angle-resolved photoemission studies of two-dimensional electron systems
… semiconductor substrates and graphite/graphene layers. Both systems are (quasi) two-dimensional and are of particular interest due to their technological importance. The major experimental tool is angle-resolved photoemission spectroscopy, which can directly measure the spectral function of the …
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