Materials Literature
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In this study, the structural and physical properties of polypropylene fibers produced from the blending of two types of polymers having similar melt flow index but different molecular weight distributions (MWD) were investigated. Polypropylene with broad MWD (V30S grade) was blended with polypropylene with narrow MWD…
We investigated the temperature dependence of magnetization reversal processes of exchange-spring magnet, hard/soft ferromagnetic heterostructures. In most previous works, the thicknesses of the soft and hard layers were used as the main control parameters to investigate the reversal mechanism of the exchange-spring m…
A novel kind of organic-inorganic monomer SUASi has been achieved by modifying 5-sulfosalicylic acid (SUA) with 3-aminopropyltrimethoxysilane (APS), subsequently binary and ternary Eu3+ mesoporous hybrid materials with 5-sulfosalicylic acid (SUA)-functionalized SBA-15 and 1,10-phenanthroline (phen) are synthesized by…
The coherent transport properties of armchair graphene nanoconstrictions (GNC) are studied using tight-binding approach and Green’s function method. We find a nonbonding state at zero Fermi energy which results in a zero conductance valley, when a single vacancy locates at y=3n±1 of a perfect metallic armchair graphen…
Electromigration results are described for a dual damascene structure with copper metallization and a low-k dielectric material. The failure times follow a 3-parameter lognormal behavior, with a threshold failure time needed to represent the entire failure distribution. We found that the threshold failure time scales…
Poly(vinylidene fluoride-trifluoroethylene) [P(VDF-TrFE)] thin films have been extensively studied for their ferroelectric properties and are a promising material for sensing and memory applications. Imprint, the time-dependent resistance to polarization reversal, is a key material property that limits applications an…
Simultaneous room temperature ferroelectricity and magnetism was observed in (Co, Li) coimplanted ZnO films. The implantation were conducted for Li and Co at energies of 50 and 400 keV, respectively, to doses of 1×1016 and 5×1016 cm−2. Remnant dipole polarization of 10.2 μC/cm2 and coercive electric field of 24.8 kV/c…
In this work, we investigate the stress developed in phosphorus-doped layers grown on (110)-textured polycrystalline diamond templates. To that end, we follow the shifts of the diamond Raman diffusion and the exciton recombination energies by Raman and cathodoluminescence spectroscopies, respectively. With each approa…
Polymers are considered to be important environmental pollutants. Polyamide 6 (PA6) is an example of an expensive monomer compared to other polymers. Thus, its recycling seems to be necessary in order to avoid environmental pollution and for the economical reuse of its wastes. To determine the feasibility of industria…
Dielectric, hysteresis and fatigue measurements are performed on Pb(Zr0.54Ti0.46)O3 (PZT) thin film capacitors with different thicknesses and different electrode configurations, using platinum and LaNiO3 conducting oxide. The data are compared with those collected in a previous work devoted to study of size effect by…
Diamond nucleation on unscratched Si surface is great importance for its growth, and detailed understanding of this process is therefore desired for many applications. The pretreatment of the substrate surface may influence the initial growth period. In this study, diamond films have been synthesized on adamantane-coa…
The effect of strain on the magnetic anisotropy of GaMnAs films has been systematically investigated using Hall effect measurements. The magnitude of the strain, which was caused by differences in the lattice constant between the GaMnAs film and buffer layer, was controlled by adjustment of the alloy composition in th…
We report a mechanism for controlling conductance in polymer nanostructures. Poly(3-dodecylthiophene-2,5-diyl) (PDDT) nanostructures were directly written between gold electrodes using thermal dip pen nanolithography and then characterized in UHV. We find that the conductivity of a PDDT nanostructure can be increased…
The interfacial properties of the Co2FeAl0.5Si0.5/MgO based magnetic tunnel junction have been investigated using x ray absorption spectroscopy (XAS), angle resolved x ray photoelectron spectroscopy (ARXPS), x ray magnetic circular dichroism (XMCD), and element-specific hysteresis loops. The XAS demonstrates a multipl…
A 17 nm thick PbTiO3 (PTO) films were fabricated via PbO gas phase reaction with TiO2 starting layer in a sputtering chamber. The influence of deposition temperature of TiO2 on the piezoelectric properties of PTO thin films was investigated. The remnant piezoresponse of PTO films nonlinearly increased as a function of…
Photocurrent system of the ferroelectric nanocylinder (FNC), including nanodisks, nanorods, and nanowires, sandwiched between metal electrodes with the short-circuit boundary conditions has been designed and investigated. Taking into account the polarization charge screening in the electrodes and near-surface inhomoge…
Fourier transform techniques are particularly suitable for modelling woven fabrics with periodic structures. These techniques allow us to analyse the periodicity and the directionality of repeated elements. In fact, while passing through the Fourier spectrum, each periodic element is characterised by a peak whose valu…
In ceramics of KTaO3 doped with 3 at. % of Mn the dielectric response is dominated by the polydispersive behavior of Mn2+ centered polar regions, whereas the magnetic and magnetoelectric (ME) behaviors reflect an intimate coupling between A-site substituted Mn2+ ions and minute amounts of Mn3O4 precipitates mediated b…
Material grown by room temperature electron beam induced deposition (EBID) using (CH3)3CH3C5H4Pt precursor consists of platinum nanocrystals embedded in an amorphous matrix. The crystallites are shown to intermix with the amorphous oxide on a Si substrate. The extent of intermixing scales with the electron energy dens…
We report the structure and physical properties of novel nanocarbon hybrids of single-walled carbon nanotubes (SWCNT) and ultradispersed diamond (UDD) forming truly tetragonal-trigonal nanocomposite ensemble with and without gamma irradiation. They were subjected to 50, 100, and 103 kGy doses and were characterized us…