Materials Literature
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The effect of Ge substitution for Si in SmMMn2Si2-xGex compounds has been studied. The Sm ordering temperature is found to be much larger in the compound with x=2, as compared to the compounds with x=0 and 1. The increase in the intra layer Mn-Mn distance is found to be responsible for this increase. Among these three…
We have performed spatially resolved polar magneto-optical Kerr effect microscopy measurements on as-grown and annealed Ga0.95Mn0.05As thin films with tensile strain. We find that the films exhibit very strong perpendicular magnetic anisotropy which is increased upon annealing. During magnetic reversal, the domain wal…
Silicon nanoparticles synthesized in the gas phase are studied. From time-resolved photoluminescence measurements we determine, quantitatively, the size-dependence of the oscillator strength of the nanoparticles. We investigate experimentally the absorption and photoluminescence emission of nanoparticle ensembles with…
The exchange bias (EB) effect was discovered 60 years ago by Meiklejohn and Bean. Meanwhile the EB effect has become an integral part of modern magnetism with implications for basic research and for numerous device applications. The EB effect was the first of its kind which relates to an interface effect between two d…
Inelastic effects in the Coulomb blockade and Kondo regimes of electron transport through molecular junctions are considered within a simple nonequilibrium equation-of-motion (EOM) approach. The scheme is self-consistent, and can qualitatively reproduce the main experimental observations of vibrational features in Cou…
The structural and electronic properties of the carbonyl sulfide dimer anion are calculated using density functional theory within a pseudopotential method. Three geometries are optimized and investigated: C2v and C2 symmetric, as well as one asymmetric structure. A distribution of an excess charge in three isomers ar…
The anchoring energy and cell gap effects on liquid crystal response time (τ0) is analyzed theoretically and validated experimentally. Analytical expressions are derived using two different approaches: effective cell gap and surface dynamic equation methods. Consistent results are deduced from these two approaches. A…
The application of a large-area (41 × 41 cm, 2048 × 2048 or 1024 × 1024 pixel) high-sensitivity (detective quantum efficiency > 65%) fast-readout (up to 7.5 or 30 Hz) flat-panel detector based on an amorphous silicon array system to the collection of high-energy X-ray scattering data for quantitative pair distribut…
An effective in situ field-emission measurement system, in which the distance between the emitting source and counter electrode can be accurately measured and finely controlled by setting up a second stage inside a scanning electron microscopy chamber, is developed. It is found that nanowires with a density between 60…
Localized surface plasmons (LSPs) of metallic nanoparticles decay either radiatively or via an electron-hole pair cascade. In this work, the authors have experimentally and theoretically explored the branching ratio of the radiative and nonradiative LSP decay channels for nanodisks of Ag, Au, Pt, and Pd, with diameter…
Experimental characterization and finite-element numerical simulations of the electromagnetic interaction between Au nanoparticles positioned atop a Si pn junction photodiode and incident electromagnetic plane waves have been performed as a function of wavelength. The presence of the Au nanoparticles is found to lead…
An effective interatomic interaction potential for SiC is proposed. The potential consists of two-body and three-body covalent interactions. The two-body potential includes steric repulsions due to atomic sizes, Coulomb interactions resulting from charge transfer between atoms, charge-induced dipole-interactions due t…
A new type of fluorescence sensory material has been developed from an alkoxycarbonyl-substituted carbazole-cornered tetracycle. Films fabricated from such materials are shown to be efficient in detecting explosive vapor, probably owing to the extended 1D molecular stacking between the component molecules and intrinsi…
High Resolution Image Download MS PowerPoint Slide The chemical reaction between [Au 11 (PPh 3 ) 8 Cl 2 ] + and n -alkanethiol C n H 2 n +1 SH ( n = 2, 8, 10, 12, 14, 16, and 18) serendipitously yielded stable Au 25 cluster compounds with the formula, [Au 25 (PPh 3 ) 10 (SC n H 2 n +1 ) 5 Cl 2 ] 2+ . Single-crystal X-…
IL MILIONE is a suite of computer programs devoted to protein crystal structure determination by X-ray crystallography. It may be used in the following key activities. ( a ) Ab initio phasing, via Patterson or direct methods. The program may succeed even with structures with up to 6000 non-H atoms in the asymmetric un…
Abstract Thermal spray processes represent a cost effective and flexible method for the production of functional coatings by using metallurgical, ceramic and cermet materials. Due to the high kinetic energy of the impinging particles, the HVOF (High Velocity Oxygen Fuel) technique is able to produce extremely dense co…
Leakage current characteristics of Pt/Ba0.6Sr0.4TiO3/Pt ferroelectric thin-film capacitors were investigated at the temperature range from 273 K to 393 K. It is implied that there are two conduction regions in the capacitors, i.e. ohmic behavior at low voltage (< 0.4 V) and Poole-Frenkel or Schottky emission mechanism…
In this paper we review our recent studies on the structure, morphology and interface chemistry of different metal systems on simple rock-salt oxides, providing a basis for the understanding of their properties. Fe on both MgO and NiO grows in the cubic structure with the and orientation. The Fe/MgO interface is sharp…
Polycrystalline NaCo 2 O 4−δ materials were prepared using the solid‐state reaction technique. The processing dependence of texturing evolution of NaCo 2 O 4−δ was investigated quantitatively. The results indicate that the extent of texture increased with increasing process duration and then reached the maximum when t…
Abstract Silica films on glass substrates with homogeneously dispersed platinum, gold or silver nanoparticles were prepared by sol‐gel processing mixtures of tetraethoxysilane and {3‐[(2‐aminoethyl)amino]propyl}triethoxysilane complexes of the corresponding metal ions, followed by dip‐coating and hydrogen treatment of…