Materials Literature
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We report x-ray magnetic circular dichroism and superconducting quantum interference device magnetometry experiments to study magnetic order and coupling in thin Fe/(Ga, Mn)As(100) films. We observe induced magnetic order in the (Ga, Mn)As layer that extends over more than 2 nm, even at room temperature. We find spect…
Long-range ferromagnetism and low-field giant magnetocaloric effect are observed in Eu8Ga16Ge30 with the type VIII clathrate crystal structure, a material that is better known for its thermoelectric properties. Magnetization and modified Arrott plots indicate that the system undergoes a second-order ferromagnetic-para…
By means of high-resolution angle-resolved photoelectron spectroscopy (ARPES), we have studied the fermiology of 2H transition metal dichalcogenide polytypes TaSe 2 , NbSe 2 and Cu 0.2 NbS 2 . The tight-binding model of the electronic structure, extracted from ARPES spectra for all three compounds, was used to calcula…
The wall shear stress from cavitation bubbles collapsing close to a rigid boundary is measured with a constant temperature anemometer. The bubble is created with focused laser light, and its dynamics is observed with high-speed photography. By correlating the frames, a hydrophone signal, and the wall shear stress, we…
We report the observation of electric field-assisted phase transition across a vanadium oxide thin film. The threshold field for initiation of transition was ∼107 V/m at room temperature and decreased with increasing temperature with activation energy of ∼0.2 eV. Electron transport mechanisms were investigated using b…
The electronic and electron transfer behaviour of two examples of a recently discovered class of triple-decker sandwich complex based on three phthalocyanine ligands linked by two chelated cadmium ions has been investigated by EPR spectroscopy and cyclic voltammetry, square wave voltammetry and linear sweep voltammetr…
The solution phase behaviour of non-peripherally substituted octa-hexyl cadmium phthalocyanine 3 and peripherally substituted octa-2-ethylhexyl cadmium phthalocyanine has been investigated in fresh solutions of CH(2)Cl(2), CHCl(3)-d(1) and THF/THF-d(8) using (1)H NMR spectrometry, UV-Vis spectroscopy, cyclic voltammet…
In this work, we have devised and fabricated a magnetic + optical, bifunctional colloidal system that combines flexible handling and efficient SERS analytical capabilities. This system comprises silica-coated magnetic γ-Fe 2 O 3 (maghemite) cores, coated with a dense monolayer of gold nanorods presenting long-term opt…
We report on the evolution of the polaron and phonon mode properties in amorphous tungsten oxide thin films measured by spectroscopic ellipsometry in the infrared to ultraviolet spectral regions as a function of the intercalated proton density. A parametric physical model dielectric function is presented, which excell…
<i>Context. <i/>Coronagraphic techniques are required for detecting exoplanets with future Extremely Large Telescopes. One concept, the Apodized Pupil Lyot Coronagraph (APLC), combines an apodizer in the entrance aperture with a Lyot opaque mask in the focal plane. This paper presents the manufacturing and testing of…
We report stable and repeatable UV and red electroluminescence (EL) from ZnO nanorod (NR) array light-emitting diodes (LEDs), where the p-type ZnO was formed by As+ ion implantation into the as-grown ZnO NRs. Both doped and undoped single ZnO NRs were probed using nanomanipulator, where the former ones showed good rec…
The distributed activation energy model (DAEM) has been shown to be more descriptive of the pyrolysis reaction than other applicable models. In this study, the temperature dependency of the preexponential factor has been included in the DAEM. The model equation has been solved using Simpson’s 1/3 rule, and the kinetic…
Small objects about 100 nm in size can be closely observed with an electron microscope, but are impossible to observe with a light microscope because of the long wavelength of the detecting light. The transmission electron microscope (TEM) has been widely used in such fields as material and biological sciences, as ele…
Aromatisch und doch anders: 1,2-Dihydro-1,2-azaborin, ein organisch/anorganisches Benzol, ist ein stabiles aromatisches Molekül, das sich dennoch von seinen isoelektronischen „organischen“ (Benzol) und „anorganischen“ Analoga (Borazin) unterscheidet. Die experimentell ermittelten Struktur-, spektroskopischen und chemi…
Monolayers of colloidally synthesized cobalt-platinum nanoparticles of different diameters characterized by transmission electron microscopy were deposited on structured silicon oxide substrates and characterized by scanning electron microscopy, grazing incidence X-ray scattering, and electric transport measurements.…
We examine theoretically the role of spin-waves on current-induced domain wall dynamics in a ferromagnetic wire. At room temperature, we find that an interaction between the domain wall and the spin waves appears when there is a finite difference between the domain wall velocity $\dot{x}_0$ and the spin current $u$. T…
A method for the calculation of the conductance of nanoscale electrical junctions is extended to ab-initio electronic structure methods and applied to realistic models of metallic wires and break-junctions of sodium and gold. The method is systematically controllable and convergeable, and can be straightforwardly exte…
In this paper we have investigated the electronic properties of Fe(OH)2 hydroxide by using the LSDA+U as well as the generalized gradient approximation. Our calculations for the iron-hydroxide show that the LSDA results are greatly at variance with experimental findings. On the other hand we have shown that LSDA+U is…
Transformation optics is a recently appreciated approach for designing complex electromagnetic media. Here, we describe the extension of transformation optical techniques to include waveguide boundary conditions. We illustrate the use of finite embedded coordinate transformations to design a medium that can be incorpo…
This volume is the eleventh in the OECD Nuclear Energy Agency (NEA) “Chemical Thermodynamics” series. It is based on a critical review of the thermodynamic properties of thorium, its solid compounds and aqueous complexes.