Materials Literature
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The contribution to the low frequency internal friction and the thermal conductivity due to optically vibrating edge dislocation dipoles is calculated within the modified Granato-Lucke string model. The results are compared with the recent experiments on plastically deformed samples of Al, Ta and Nb at low temperature…
We report a simple theoretical derivation of the spectrum and damping of spin waves in a cylindrical periodically structured magnetic nanowire (cylindrical magnonic crystal) in the "effective medium" approximation. The dependence of the "effective" magnetic parameters upon the individual layer parameters is shown to b…
The electronic properties of multi-wall carbon nanotubes (MWNTs) have attracted much attention because they could lead to nano-sized electronic devices. Using chemical vapor deposition (CVD), MWNTs are produced in large quantities at a low cost. CVD-produced MWNTs, however, generally contain a considerable amount of s…
Thin films of cadmium stannate was prepared using low cost cadmium acetate and tin (II) chloride precursors by spray pyrolysis technique at three different substrate temperatures of 400, 450 and 5000 C. A novel procedure of simultaneously forming additional layer, introduced for the first time in this work, on the alr…
The static configuration of ferroelectric domain walls was investigated using atomic force microscopy on epitaxial PbZr(0.2)Ti(0.8)O(3) thin films. Measurements of domain wall roughness reveal a power-law growth of the correlation function of relative displacements B(L) alpha L(2zeta) with zeta approximately 0.26 at s…
The crystal structure and electronic and magnetic properties of magnetic molecular conductor (EDTDM) 2 FeBr 4 are investigated. The material undergoes a SDW transition at T MI ∼11 K and an antiferromagnetic transition of Fe 3+ d -spins at T N =3 K. In addition to the appearance of an anomaly in the resistivity around…
Resistivity, thermopower and Hall coefficient have been systematically measured for polycrystalline samples of (Bi 1- x Pb x ) 1.8 Ba 2 Rh 1.9 O y . An upturn of the resistivity and the Hall coefficient below 50 K is ascribed to decrease in the density of states due to a pseudogap formation. The thermopower and Hall c…
The electrical resistivity ρ and thermopower S of Heusler compounds Fe 3- x V x Al have been measured at the temperature range from 1.5 to 300 K at magnetic fields up to 15 T. The measurements of ρ and S in the high temperature range up to 800 K have been performed. ρ and S show a semiconducting behavior at high tempe…
Using homogenization theory, we derive the effective permittivity and permeability of a wire-mesh photonic crystal from first principles. We show that this structure does not lead to a left-handed medium when it is embedded in a matrix with a negative mu, but that resonators in a medium with a negative epsilon do form…
We have investigated the resistivity of an organic Mott insulator, β'-(BEDT-TTF) 2 AuCl 2 , under extremely high pressures of up to 9.9 GPa, using the cubic anvil press, motivated by the fact that a related material, β'-(BEDT-TTF) 2 ICl 2 , shows the highest transition-temperature superconductivity among organics at 8…
The magnetoelectric effect in millimeter size PMN-PT∕Terfenol-D composites is known. In an effort towards miniaturization, we report on the magnetoelectric effect in micrometer-size sputtered composites. Multilayers of TbFe∕FeCo with a thickness of 4μm were sputter deposited on both sides of PMN-PT piezoelectric singl…
Microscopy experiments are employed to characterize the elastic interactions of magnetic nickel nanowires suspended in a nematic liquid crystal. The nematic imposes a torque on an isolated wire that increases linearly with the angle between the wire and the nematic director in a manner quantitatively consistent with p…
Nanowires of the Fe–Ga alloy system, Fe1−xGax (0.1⩽x⩽0.25at.%), were fabricated using electrochemical deposition into nanoporous anodic alumina. Fe–Ga alloys are magnetically soft, mechanically robust, ductile, and have large magnetostriction. High aspect ratio nanowires with varying diameters and lengths were fabrica…
Monodispersed Fe–Pt nanoparticles are promising candidates for biomedical applications with an average particle diameter of 6.9nmFe48Pt52, 3.3nmFe52Pt48, and 4.2nmFe70Pt30. They are prepared by simultaneous chemical reduction of Pt(acac)2 and thermal decomposition of Fe(CO)5 in the presence of surfactant as an anti-ox…
In the drying process of paste, we can imprint into the paste the order how it should be broken in the future. That is, if we vibrate the paste before it is dried, it remembers the direction of the initial external vibration, and the morphology of resultant crack patterns is determined solely by the memory of the dire…
We examine the Lindemann melting law at different pressures using the vibrational density of states (DOS), equilibrium melting curve, and Lindemann parameter delta(L) (fractional root-mean-squared displacement, rmsd, at equilibrium melting) calculated independently from molecular dynamics simulations of the Lennard-Jo…
We numerically investigate the electromagnetic field radiated by a line source within a perfect lens [Phys. Rev. Lett. 85, 3966 (2000)] consisting of two orthogonal planes delimiting positive and negative index media. Use of a coordinate transformation [J. Phys. Condens Matter 15, 6345 (2003)] together with a well-ada…
Raman spectra of TeO2-based glasses doped with WO3, ZnO, GeO2, TiO2, MoO3, and Sb2O3 are measured. The intensity of bands in the Raman spectra of MoO3-TeO2 and MoO3-WO3-TeO2 glasses is shown to be 80-95 times higher than that for silica glass. It is shown that these glasses can be considered as one of the most promisi…
This project investigates the behavior of iron–gallium (Galfenol) alloys in elastic bending to facilitate the design concepts for using Galfenol in novel sensor applications at the macro to nanoscale. A series of experiments are conducted on the magnetic response of cantilevered beams to dynamic bending loads. The sam…
We report on the first observation of magnetoelectric X-ray scattering (MEXS), i.e., incident- k -direction-dependent scattering, for a polar ferrimagnet GaFeO 3 . Near the K edge of Fe, the magnetic component of the (040) X-ray reflection shows a larger enhancement than that of the (020) X-ray reflection, which canno…