Materials Literature
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Structural analysis of a layered manganese tungstate diaminoalkane hybrid series suggests that this compound forms a spin-5/2 spin-ladder structure. We use X-ray diffraction, electron microscopy and x-ray absorption spectroscopy results to infer the structure. DC magnetization of the manganese compound and a possible…
The Raman scattering behavior of anatase nanocrystals with average diameters of 4, 8, 20, and 34 nm has been compared with bulk crystal data in order to establish size-dependent changes to the phonon spectrum at ambient conditions. Further, the high-pressure behavior of the anatase nanocrystals was examined at room-te…
By the use of classical atomistic molecular dynamics simulations, we demonstrate that paracetamol molecules exist in a highly ordered phase in the presence of a glycogen substrate at 317 K whereas the paracetamol fluid exists in an isotropic phase in the absence of the glycogen substrate at the same temperature. This…
In design of partial discharge (PD) diagnostic systems, finding a set of features corresponding to an optimal classification performance (accuracy and reliability) is critical. A diagnostic system designer typically does not have much difficulty to obtain a decent number of features by applying different feature extra…
The microstructure and the hard magnetic properties of the melt-spun (Fe1−xPtx)78Zr4B18 (x=0.385, 0.45, 0.50, and 0.55) nanocrystalline alloys have been investigated. The ordered L10-FePt phase with a grain size smaller than the critical single domain size is directly formed by rapidly quenching of the alloy melt with…
Using in situ infrared absorption spectroscopy, the behavior of the film precursors, tris(dipivaloylmethanato)lanthanum [La(DPM)3], tris(dipivaloylmethanato)manganese [Mn(DPM)3], and bis(dipivaloylmethanato)strontium [Sr(DPM)2], in the gas phase was investigated under actual chemical vapor deposition conditions of man…
We have studied losses of microwave electromagnetic radiation in granular amorphous hydrogenated carbon films a-C:H(Co) containing cobalt nanoparticles at cobalt concentrations below the percolation threshold and in the percolation threshold region. The difference between the experimental values of the losses in granu…
The structural transformation from the metastable disordered TbCu7-type SmCo7 structure to the equilibrium ordered Th2Zn17-type Sm2Co17 structure was revealed by x-ray diffraction analysis using Reitveld refinement. The magnetic properties depended strongly on the stage of the transformation, as the coercivity strongl…
Abstract Electropolymerization of pyrrole‐3‐acetic acid was performed by cyclic voltammetry on titanium and Ti90Al6V4 substrates with the aim of developing a multilayer structure for applications in advanced biomaterials. The polymeric films obtained were characterized by both XPS and time‐of‐flight secondary ion mass…
As an origin of degradation of remnant polarization in Pt∕BaTiO3∕Pt capacitor structure, an interfacial layer formed at the interface of BaTiO3 film and a Pt bottom electrode is considered. BaTiO3 films were deposited on two types of bottom electrodes (La0.5Sr0.5CoO3 and Pt) by the radio frequency magnetron sputtering…
Luminescence intensity and stability of nanocrystalline silicon (nc-Si) passivated with oxygen and hydrogen atoms have been studied by using electron-spin resonance and photoluminescence measurements. The oxygen-passivated nc-Si with low-density Pce′ centers (luminescent states) and high-density Pb centers (nonlumines…
A low-temperature ordering of FePt was achieved by introducing dynamic stress. The ordering temperature of FePt was reduced to 300°C by using a Cu underlayer on the HF-cleaned Si (001) substrate. An in-plane coercivity as high as 6900Oe can be obtained after post-annealing at 300°C. The formation of copper silicide, C…
In a recent paper (Mayer et al , 2004 Phys. Rev. Lett. 93 115701) it was shown, by means of experiments, theory and simulations, that coarsening systems display dynamic heterogeneity analogous to that of glass formers. Here, we present a detailed analysis of dynamic heterogeneities in the Glauber–Ising chain. We discu…
Fully dense anisotropic nanocomposite Sm(Co0.58Fe0.31Zr0.05Cu0.04B0.02)z (z=7.5–12) magnets have been synthesized via rapid hot pressing and hot deformation processes. The highest (BH)max∼10.6MGOe was observed for a magnet with z=10. X-ray diffraction and M-H measurements indicated that the easy magnetization directio…
The stress of damascene Cu integrated with silicon dioxide (SiO2) and a low-k material was analyzed by x-ray diffraction, and that of the via-line structure was evaluated using finite element analysis. In both cases, the hydrostatic stress of the Cu line embedded in SiO2 was greater than that of the Cu line with low-k…
We report on the preparation and some physical properties of a quaternary system based on Bi2Se3 codoped with Sb and Pb. Single-crystal samples were prepared using the Bridgman technique and were characterized by measurements of the lattice parameters, electrical resistivity, Hall coefficient, Seebeck coefficient, and…
Multilayers of Ba0.5Sr0.5TiO3 (BSTO) and BaFe12O19 (BaM), with tunable permeability and permittivity are attractive systems for radio frequency and microwave applications. We have grown multilayers of BSTO and BaM using magnetron sputtering on Al2O3 substrates. Film growth conditions such as sputtering parameters were…
A theoretical investigation is made into the dynamics of pitch jumps in cholesteric liquid-crystal layers having finite strength surface-anchoring conditions. A presentation is given of general formulations which connect the dynamics of pitch jumps with the key material parameters such as the viscosity, the specific f…
We demonstrate focusing of a plane microwave by a planoconcave lens fabricated from a photonic crystal having a negative refractive index and left-handed electromagnetic properties. An inverse experiment, in which a plane wave is produced from a source placed at the focal point of the lens, is also reported. A frequen…
Sr Ru O 3 (SRO) thin films were grown on SrTiO3 (100) substrates using the pulsed laser deposition method. In order to fully exploit the correlation between their properties and the partial (working) pressures of oxygen in which they are grown, a wide range of pressures—from 0.1to300mTorr—was investigated. SRO ablatio…