Materials Literature
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We show that ferromagnetic films separated by a spacer of amorphous Si are exchange coupled for Si thicknesses ${d}_{\mathrm{Si}}\ensuremath{\le}40$\AA{}. For $14\AA{}<{d}_{\mathrm{Si}}<22\AA{}$ we observe antiferromagnetic coupling. The coupling strength of approximately 5 \ifmmode\times\else\texttimes\fi{} ${1…
I present observations of interfacial tension between miscible pairs of silicate liquid and propose a theoretical model that quantitatively accounts for them. Viscoelastic rheology of the liquids permits the establishment of gradient stress completely analogous to thermal stress in Maxwell solids; this is expected whe…
The addition of 0.4–8.6 at. % Co to Cu thin films strongly influences the temperature evolution of microstructure, stress, and resistivity. For concentrations near 1 at. % Co in coevaporated Cu-Co on oxidized Si, normal grain growth begins at about 75 °C, about 50 °C lower than in pure Cu. There is an abrupt decrease…
We provide a theoretical explanation for the observed quasiuniversality of the ratio of the long-time to short-time self-diffusion coefficients in the colloidal liquids at freezing. We also predict that the mean-squared displacement at freezing, plotted against a suitably renormalized time, yields a universal curve sh…
Abstract Isotactic polypropylene was grafted with maleic anhydride using benzoyl peroxide as an initiator and toluene as a solvent. Effects of various parameters such as monomer and initiator concentration, reaction time, and reaction temperature on percentage grafting were studied. Effect of various solvents on exten…
Abstract The structure of oriented polyaniline (PANI) films were characterized by elemental analysis, FTIR, XPS, SEM, and X‐ray diffraction, and their electrical properties were measured as a function of the protonation state, elongation ratio, temperature, and applied pressure. A maximum conductivity at room temperat…
The blue and infrared (IR) bands of the photoluminescence spectra in the temperature range 11-430 K and excitation bands at 77 and 300 K of zinc tungstate single crystals have been studied. The line shape, obtained from the theory of lattice relaxation and multiphonon transitions, is compared with the experimental res…
Electrical conductivity (σ) and thermopower measurements have been carried out on some Mg 1+x Ge x Fe 2−2x O 4 (0 < x < 0.4) ferrite samples over a temperature range 300–700 K. Using the experimental values of Seebeck coefficient at various temperatures, the values of charge carrier concentration have been deter…
The relaxation time of the magnetization of a big magnetic molecule is evaluated. Isotropic exchange is assumed to be dominant, resulting in a fixed spin modulus s (equal to 20 in the case of interest). A perturbation of the form AS z 2 results from spin-orbit coupling and produces an energy barrier As 2 which separat…
\nThe growth of micron-size carbon fibres from thermal decomposition of hydrocarbons catalyzed by a metal has been widely studied. Coil-shaped fibres often grow among straight or twisted filaments. Their internal structure has not been studied in detail as yet. In the present work, the thermal cracking of acetylene on…
This book is a comprehensive design text for permanent magnets and their application. Permanent magnets are very important industrially, and are widely used in a variety of applications, including industrial drives, consumer products, computers and cars. In the early 1970s a new class of magnet - the rare earths - was…
Human tryptophan hydroxylase has been expressed as a soluble and active form in Escherichia coli by fusion with an affinity tag, maltose-binding protein. The fusion protein has been purified to near homogeneity by affinity chromatography on crosslinked amylose resin. The purified fusion protein has a specific activity…
Abstract Rubber toughening of thermoplastic polymers always decreases the tensile and flexural properties. In this article, an attempt is made to improve the tensile and flexural properties of a rubber‐toughened polymer system viz., polypropylene (PP)/styrene‐ethylene‐butylene‐styrene tri‐block copolymer (SEBS) binary…
Multivariable statistically designed experiments have been used to optimize diamond growth in a H2-CH4-O2 magnetoactive plasma at 1–3 Torr total pressure. The input process parameters included total pressure, microwave power, substrate temperature, methane and oxygen fractions, and applied substrate bias, and the expe…
The resonant photoemission of iron films on copper has been examined near the 3p to 3d excitation threshold using synchrotron radiation from the MAX storage ring. Resonant profiles are presented in the photon energy range 46-150 eV. Special attention has been paid to the position of the destructive minimum before the…
The electronic structure of orthorhombic potassium niobate has been studied with a particular focus on empty electronic states. Occupied electronic states were analysed by X-ray photoelectron spectroscopy. Empty electronic states were probed by X-ray absorption spectroscopy at the oxygen K edge (531 eV), the niobium L…
We have analysed by use of synchrotron radiation induced angle resolved photoemission spectroscopy (PES), Auger electron spectroscopy (AES) and low-energy electron diffraction (LEED) the growth of ultrathin Co layers deposited at room temperature on Pt(111) surfaces. The LEED patterns indicate an incoherent epitaxy an…
The extremely large zero-field splitting of Fe 3+ ions at the tetragonal FeF 5 O site in Fe 3+ :KMgF 3 crystals has been interpreted on the basis of a second- to sixth-order perturbation approach, in which the spin-orbit coupling is regarded as the perturbation to the crystal-field and electrostatic interactions. The…
Pr3+-doped As-S chalcogenide fiber is fabricated using a double-crucible method. The thermal and spectroscopic properties of Pr3+-doped As-S glasses are clarified. Pr3+-doped As-S fiber is shown to be a promising candidate that will lead to efficient Pr3+-doped fiber amplifiers.
GaInO3 is recently identified transparent conducting material which is structurally and chemically distinct from indium tin oxide [R. J. Cava, J. M. Phillips, J. Kwo, G. A. Thomas, R. B. van Dover, S. A. Carter, J. J. Krajewski, W. F. Peck, Jr., J. H. Marshall, and D. H. Rapkine, Appl. Phys. Lett. 64, 2071 (1994)]. We…