Browsing Physics by Title
Now showing items 308-327 of 2105
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The creation and annihilation of optical vortices using cascade conical diffraction
(2011)Internal conical diffraction produces a superposition of orthogonally polarised zero- and first-order Bessel like beams from an incident circularly polarised Gaussian beam. For right-circularly polarised light, the first-order ... -
Critical field behavior and antiband instability under controlled surface electromigration on Si(111)
(2011)In this study we investigate step bunching and antiband surface instabilities on Si(111). We experimentally study the effects of a controlled electromigration field on the onset of antibands. We analyze the initial stage ... -
Critical behavior of La0.75Sr0.25MnO3
(American Physical Society, 2002)Magnetization, susceptibility, and specific heat measurements were made on a single crystal of La0.75Sr0.25MnO3. The ferromagnetic-to-paramagnetic phase transition was found at 346 K and four critical exponents were measured ... -
Critical supercurrents and self organization in quantum Hall bilayers
(2010)We present a theory of interlayer tunneling in a disordered quantum Hall bilayer at total filling factor one, allowing for the effect of static vortices. In agreement with recent experiments [Phys. Rev. B 80, 165120 ... -
CrO2 : a general study
(Trinity College (Dublin, Ireland). School of Physics, 2000)The aims of this work were (i) to prepare chromium dioxide, CrO2, in thin film and powder form (ii) to study its magnetic, electronic and thermal properties and (iii) to introduce thin films of CrO2 into a multilayer device ... -
Crystal Fields in Nd2Fe14B
(American Physical Society, 1984)The leading terms in the crystal field at both rare-earth sites in the new permanent magnet alloy Nd2Fe14B are B20 and B22s. The sign of B20 explains the variation of the anisotropy constant K1 reported by Sagawa et al. ... -
The Crystal Structure of Bubbles in the Wet Foam Limit
(2006)We have observed a rich variety of three-dimensional crystal and defect structures spontaneously formed by small (diameter 200 µm) bubbles in a wet foam. The observations confirm and extend those made by Bragg and Nye in ... -
The Crystal Structure of Bubbles in the Wet Foam Limit (Amendment)
(Royal Society of Chemistry, 2006)We have observed a rich variety of three-dimensional crystal and defect structures spontaneously formed by small (diameter 200 mm) bubbles in a wet foam. The observations confirm and extend those made by Bragg and Nye ... -
Crystallographic Characterisation of Ultra-Thin, or Amorphous Transparent Conducting Oxides ? The Case for Raman Spectroscopy
(2020)The electronic and optical properties of transparent conducting oxides (TCOs) are closely linked to their crystallographic structure on a macroscopic (grain sizes) and microscopic (bond structure) level. With the increasing ... -
Crystallographic orientation analyses of magnetite thin films using electron backscatter diffraction (EBSD)
(2006)The crystallographic orientation of magnetite (Fe3O4) thin films was measured using electron backscatter diffraction (EBSD). Misorientation boundaries appear in maps of angular misorientation data. The distribution of ... -
Cubic Mn 2 Ga Thin films: Crossing the spin gap with ruthenium
(2014)Cubic Mn2Ga films with the half-Heusler C1b structure are grown on V (001) epitaxial films. The phase is a soft ferrimagnet, with Curie temperature TC = 225 K and magnetization Ms=280 kA m−1, equivalent to 1.65μB per ... -
Curing of complex monomer systems: a spectroscopic and thermal analysis
(Trinity College (Dublin, Ireland). School of Physics, 2001)This thesis describcs the development of a novel methodology, which uses the high resolution liquid nuclear magnetic resonance (NMR) spectroscopic technique to continuously monitor in real time the thermal and UV-photoinitiated ... -
Current trends in amorphous magnetism
(IEEE, 1984)Recent research on some topics in amorphous magnetism is reviewed and questions are posed which should be answered by future work. The topics are i) appearance of magnetism in binary alloys of the 3d transition elements ... -
Current-induced energy barrier suppression for electromigration from first principles
(2011)We present an efficient method for evaluating current-induced forces in nanoscale junctions, which naturally integrates into the nonequilibrium Green's function formalism implemented within density functional theory. This ... -
Current-induced phonon renormalization in molecular junctions
(2016)We explain how the electrical current flow in a molecular junction can modify the vibrational spectrum of the molecule by renormalizing its normal modes of oscillations. This is demonstrated with first-principles self-consistent ... -
Cyclic production of biocompatible few-layer graphene ink with in-line shear-mixing for inkjet-printed electrodes and Li-ion energy storage
(2022)The scalable production of two-dimensional (2D) materials is needed to accelerate their adoption to industry. In this work, we present a low-cost in-line and enclosed process of exfoliation based on high-shear mixing to ... -
Cylindrical permanent-magnet structures using images in an iron shield
(IEEE, 2003)We report on cylindrical permanent-magnet structures that exploit the image effect in a surrounding circular soft-iron sheath. We present the theory for a general multipole ring, where the polarization direction ? = (n + ...