Materials Literature
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The activity of the c-Src protein tyrosine kinase is regulated by phosphorylation of a tyrosine residue (Tyr-527) in the C-terminal tail of the molecule. Phosphorylation of Tyr-527 promotes association of the tail with the SH2 domain and a concomitant reduction of the enzymatic activity of Src. We asked the question w…
We present a stability analysis of the silicon-electrolyte interface for the etching of both n- and p-type silicon. The description is based on the model that we have developed in a preceding paper for n-type silicon. The model incorporates the transport phenomena of holes in the semiconductor and ions in the electrol…
In the framework of a tight-binding model, we study energy spectra and persistent currents in mesoscopic Fibonacci rings threaded by a magnetic flux. It is found that the flux-dependent electron eigenenergies E(\ensuremath{\Phi}) in mesoscopic Fibonacci rings still form ``bands'' with respect to the flux \ensuremath{\…
In situ Na intercalation of the layered compound ${\mathrm{VSe}}_{2}$ has been studied with photoemission and scanning tunneling microscopy. Core-level spectroscopy proves that Na deposited in UHV onto the ${\mathrm{VSe}}_{2}$ surface rapidly intercalates, leaving only small amounts at the surface. The scanning tunnel…
In general liquid–liquid demixing processes are responsible for the porous morphology of membranes obtained by immersion precipitation. For rapidly crystallizing polymers, solid–liquid demixing processes also generate porous morphologies. In this study, the interference of both phase transitions has been analyzed theo…
We analyze the effects of disorder on the magnetic properties of two manganeseporphyrins, [MnTPP][TCNE]⋅x(o-DCB) and [MnTPP][TCNE]⋅y(o-Xy) and (TPP=meso-tetraphenylporphyrinato, TCNE=tetracyanoethylene, o-Xy=o-xylene, o-DCB=o-dichlorobenzene, x⩽3, y⩽1). We present data for the in- and out-of-phase ac susceptibility an…
Magnetization processes in nanocomposite permanent magnets are investigated using a dynamic micromagnetic model. Numerical examples show the effects of the dispersion of the intrinsic magnetic properties at grain boundaries and the influence of gyromagnetic precession on magnetization reversal. Reduced exchange intera…
Highly textured Li-ferrite films have been synthesized by pulsed laser deposition from bulk targets onto c-plane sapphire substrates. For substrate temperatures approaching 1000 °C the growth mode was predominantly (333). A similar growth mode was recently reported for Ni-ferrite films grown onto c-plane sapphire subs…
A single crystal of La0.7Sr0.3MnO3 was grown by the floating zone method. The ferromagnetic resonance linewidth at 8.5 GHz has a minimum of 50 Oe at 340 K and increases with lowering temperature. This is indicative of some residual inhomogeneity. The anisotropy of the resonance field was studied as a function of angle…
The ab initio calculation is reported on the ${\mathrm{B}}_{12}$ clusters in crystalline Si, whose existence has been recently suggested experimentally. We investigated the atomic and the electronic structures for two possible configurations of ${\mathrm{B}}_{12}$ clusters; icosahedron and cubo-octahedron. We found th…
Neutron diffraction and magnetization measurements have been performed on numerous systems with the divalent and monovalent substitution, Pr1−xAx2+Mn1−x3+Mnx4+O3 (A=Ca, Sr, Ba) and Pr1−x/2Ax/2+Mn1−x3+Mnx4+O3 (A=Na, K). The study shows that the transition from the Ay-type (layer) antiferromagnetism in pure PrMnO3 to th…
The effects of Ba content on the dynamics of the crystallization process, which ultimately determines the grain size, were studied in barium ferrite thin films. Rapid thermal annealing was used to crystallize the amorphous as-deposited barium ferrite films. The annealing time and temperature dependent crystalline volu…
SmCo based films containing 20 at. % Fe and with Sm varying from 15.5 to 17 at. % have been synthesized to show the transition from ordered CaCu5 to disordered TbCu7 phase. For either phase, the demagnetization energy present during deposition can result in films with the crystallite c axes randomly splayed onto the f…
To investigate the possibility of using the half-metallic ferromagnet PtMnSb in giant magnetoresistance (GMR) applications, we have examined the surface roughness, structural uniformity, mean-free path, and lattice disorder of sputtered epitaxial PtMnSb(111) films on Al2O3(0001) in the range 85 Å⩽t⩽1100 Å. Atomic forc…
Resonant photoemission measurements of ${\mathrm{TiO}}_{2}$ (100) at the Ti ${\mathrm{L}}_{2,3}$ edge are reported. For transitions from 2p to 3d states of ${\mathrm{e}}_{\mathrm{g}}$ symmetry there is a resonance enhancement of the intensity of the band-gap defect states by a factor of 6. The valence band shows reson…
The recent observation of steps at regular intervals of magnetic field in the hysteresis loops of oriented crystals of the spin-10 molecular magnet Mn12O12(CH3COO)16(H2O)4 has been attributed to resonant tunneling between spin states. Here, we investigate the effect on the relaxation rate of applying the magnetic fiel…
Thin films of Nd2Fe14B with a c-axis orientation and bulklike magnetic properties have been grown via molecular beam epitaxy with thicknesses as low as 300 Å. The films are grown on single-crystal MgO(100) wafers overcoated with epitaxial Mo(100) buffer layers. The 2–14–1 phase is crystallized either by sequential dep…
We present a simple method to measure the contribution from acoustic phonons to the linear electro-optic effect. A step voltage with a short rise time (600 ps) is applied to the sample, and the electro-optic response is measured in the time domain. For the organic salt 4-N, N-dimethylamino-4(?)-N(?)-methyl-stilbazoliu…
Superlattice structures based on doped Mn-oxides and SrTiO3 exhibit desirable magnetotransport properties, such as an enhanced magnetoresistance (MR) and a broadened MR transition. An La0.7Ca0.3MnO3 (55 Å)/SrTiO3 (160 Å) superlattice shows 61% MR at 0.5 T and 109 K, defined by [R(0 T)−R(0.5 T)]/R(0 T), compared to 38%…
We have studied magnetic and magnetotransport properties of novel III-V diluted magnetic semiconductors, (Ga1−xMnx)As. The GaMnAs thin films were grown on GaAs(001) substrates by low temperature molecular beam epitaxy. We present magnetoresistance, extraordinary Hall effect, and M–H characteristics of two (Ga1−xMnx)As…