Materials Literature
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We investigate and discuss the interaction of a hydrogen atom (H) with graphene based on the density functional theory (DFT). Our calculation results show that reconstructions of carbon atoms play an important role in the H adsorption on graphene. When constituent carbon atoms are held rigid, endothermic H adsorption…
ZnO wires were grown by a vapor–liquid–solid phase transport process. Self-assembled Au nano-clusters act as a catalyst or seed for the highly oriented growth of so-called ZnO whiskers on sapphire substrates by a vapor–liquid–solid phase transport process. The ZnO nanowires were more than 500 nm high and smaller than…
Ni/Cu multilayer nanowires have been fabricated by electrodeposition into 6 μm thick nanoporous polycarbonate templates with pore sizes from 30 to 100 nm. The aspect ratio of the magnetic segments was varied from 0.02 (disk shaped) to 50 (rod shaped) with 10–250 Ni/Cu bilayers. The M–H curves show that the magnetic re…
Substitution of Co2+ for a small part of Fe2+ in (MnZn)Fe2O3 results in much smaller temperature variation in core loss, compared with that of conventional MnZn ferrite used for transformers. This effect appears in the temperature dependence of hysteresis loss rather than two other contributions of loss, eddy current…
Detailed ferromagnetic resonance measurements on thin Ni80Fe20 films are described that determine characteristics of intrinsic damping and the effects of intentionally created defects on linewidth. Measurements are made as a function of frequency with magnetization oriented in-plane and normal to the plane. For nomina…
Martensitic Ni-Mn-Ga single crystals are easily twinned and the twin boundaries can be displaced by applying a mechanical stress or magnetic field. Twin boundary motion is a highly dissipative process. Composites of aligned Ni-Mn-Ga particles in a polymer matrix show evidence of stress-induced twin boundary motion tha…
Spectral hole burning reveals a sharp zero-phonon line (ZPL) as well as discrete acoustic phonon sidebands in CdSe nanocrystals. The ZPL linewidth obtained from the spectral hole burning depends strongly on the measurement time scale, reflecting effects of spectral diffusion. The nonlinear optical measurement allows u…
We have investigated the different mechanisms of photoluminescence (PL) of silicon nanocrystals due to the quantum confinement effect (QCE) and interface states. Si nanocrystals were formed by pulsed-laser deposition in inert argon and reactive oxygen gas. The collisions between the ejected species greatly influence t…
We demonstrated the radio-frequency (rf) noise suppressor using soft magnetic films on a coplanar transmission line from 0.1 to 20 GHz. The coplanar transmission line is composed of magnetic film/polyimide/Cu transmission line/seed layer (Cu/Ti)/glass substrate with the dimension of 50 μm width of the signal line and…
Fine flakes of Fe–Si–Al produced by long-duration microforging exhibit a peculiar dual-peak dispersion in their frequency characteristics of the imaginary part of the permeability. This dual dispersion has a high potential to be a electromagnetic noise suppressor, works effectively in the microwave band. In a previous…
In order to reproduce the two-step relaxation observed experimentally in spin-crossover systems, we investigate analytically the static and the dynamic properties of a two-sublattice Ising-like Hamiltonian. The formalism is based on a stochastic master equation approach. It is solved in the mean-field approximation, a…
The temperature-dependent behavior of excitonic photoluminescence observed in ZnO/MgZnO multiple quantum wells (MQWs) in the temperature range of 5–300 K is described. In a ZnO/Mg0.27Zn0.73O MQW grown by laser molecular-beam epitaxy, the luminescence was dominated by localized exciton (LE) emission throughout the whol…
The homogeneous line shape and inhomogeneous broadening of colloidal quantum dots are measured at ambient temperatures and in solution. Three-pulse echo peak shift (3PEPS) measurements of nanocrystalline CdSe semiconductor quantum dots in toluene solvent at 298 K are reported. Modeling of the 3PEPS data using a detail…
The low-temperature (<150 K) oxidation of nitrided iron surfaces exposed to oxygen and water was probed using X-ray photoelectron spectroscopy (XPS), reflection absorption infrared spectroscopy (RAIRS), and mass spectrometry (MS). During exposure of nitrided iron surfaces to oxygen, iron oxynitride (Fe x N y O z ), ni…
Scanning capacitance microscopy was used to image the polarization-induced microstructural patterns of sol-gel derivative SrBi2Ta2O9 (SBT) thin films. A sharp image contrast was induced between the nanosized domains owing to the various polarities, so that the domain structure in the SBT thin film was clearly revealed…
Magnetite (Fe3O4) nanoparticles, 8 to 9 nm in size, have been synthesized using an aqueous precipitation technique. X-ray diffraction and chemical titration confirm a single cubic spinel phase with expected stoichiometry. Superparamagnetic behavior has been observed in pressed pellets of the nanoparticles above 200 K.…
We investigate oxygen vacancy ordering in epitaxial (La0.5Sr0.5)CoO3−∂ thin films grown by sputter deposition on (001) LaAlO3 and (001) SrTiO3. After annealing at 500 °C under oxygen partial pressures greater than those used during deposition, films transform to a long-range oxygen vacancy ordered structure with ortho…
Magnetic field-induced strain (MFIS) along the [001]P (the symbol “P” represents parent phase) direction due to the conversion of martensite variants has been investigated for a disordered Fe–31.2Pd(at. %) single crystal and an ordered Fe3Pt single crystal exhibiting martensitic transformations from cubic phases to te…
Three distinct liquid–liquid coexistence regions were observed for ST2 model water by restricted ensemble Monte Carlo simulations of the isotherms of homogenized systems and by phase equilibria simulations in the Gibbs ensemble. The lowest density liquid–liquid transition meets the liquid–vapor phase transition at a t…
Electron-beam-induced deposition (EBID) is a potentially fast and resistless deposition technique which might overcome the fundamental resolution limits of conventional electron-beam lithography. We advance the understanding of the EBID process by simulating the structure growth. The merit of our model is that it expl…