Materials Literature
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Multiferroic materials possess two or more types of orders simultaneously that couple the electric and magnetic fields, and composite multiferroics have been widely explored for their excellent magnetoelectric coupling. In this letter, we report a strategy to hybrid multiferroicity at nanoscale. Multiferroic CoFe2O4–P…
Abstract We have demonstrated that unsubstituted thiophene can be polymerized by Fe 3+ ‐catalyzed oxidative polymerization inside nanosized thiophene monomer droplets, that is, nanoreactors, dispersed in aqueous medium, which can be performed under acidic solution conditions with anionic surfactant. Besides, we propos…
We develop an approach to utilize anisotropic metamaterials to solve one of the fundamental problems of modern plasmonics--parasitic scattering of surface waves into free-space modes, opening the road to truly two-dimensional plasmonic optics. We illustrate the developed formalism on the examples of plasmonic refracto…
Magnetite (Fe3O4) thin films have been grown on ferroelectric BaTiO3 (BTO) single crystal substrates by pulsed laser deposition. Transmission-electron microscope observations demonstrate the orientation relationship between Fe3O4 and BTO as [400]Fe3O4∥[200]BTO and [004]Fe3O4∥[002]BTO. Experimental measurements of magn…
Thermal transport in carbon nanotubes is explored using different laser powers to heat suspended single-walled carbon nanotubes ∼5μm in length. The temperature change along the length of a nanotube is determined from the temperature-induced shifts in the G band Raman frequency. The spatial temperature profile reveals…
We report substantially reduced fatigue and electrical leakage in BiFeO3 membranes fabricated by releasing epitaxial (001) BiFeO3 films from the Si substrates on which they were grown. Fatigue-free switching behavior of up to 1010cycles was observed for BiFeO3 membranes with Pt top electrodes, while as-grown films bre…
Factors affecting the thin cell performance of a liquid crystal cell are analyzed. Examples based on vertically aligned thin cells are given to illustrate these effects. When the cell gap is below ∼2μm, the liquid crystal alignment material, layer thickness, and anchoring energy all play important roles. The first two…
The stable lotus-leaf-like superhydrophobic copper was fabricated by means of a very simple and industrially up scalable method. Under both the growth of CuO microcrystals on the surface and the chemical modification, the wettability of the copper substrate changed from hydrophilic to water-repellent superhydrophobic,…
A polymer chain tethered to a surface may be compact or extended, adsorbed or desorbed, depending on interactions with the surface and the surrounding solvent. This leads to a rich phase diagram with a variety of transitions. To investigate these transitions we have performed Monte Carlo simulations of a bond fluctuat…
This work demonstrates a fabrication technique of high sensitivity flexible strain sensors at room temperature. The grown well-aligned millimeter-long single-walled carbon nanotube (SWCNT) was transferred from the silicon substrate to the pretrenched flexible substrate. The sensor design allows effective adhesion betw…
We report the observation of room temperature ferromagnetism in Cu-doped (5%) ZnO films grown on c-plane sapphire substrates. Films were prepared by pulsed laser deposition technique and were thoroughly characterized using several state-of-the-art characterization techniques. Hall measurements showed that the films ar…
The thermal conductivity and electrical resistivity of a suspended nickel nanowire have been measured for T=15–300K. The temperature dependence of the thermal conductivity and the Lorenz number strongly differ from the bulk. The comparison of the transports in the Ni nanowire shows, that at temperatures 75<T&am…
Co Fe 2 O 4 – Ba Ti O 3 heterostructure was epitaxially grown on the (001)-SrTiO3 substrate via pulsed laser deposition, in which the bottom BaTiO3 layer epitaxially grown on the substrate acts as a buffer layer and effectively reduces the coherent constraint in the magnetic layer arising from the substrate. Microstru…
Recent fabrication of atomic precision nanodevices for spintronics greatly boosted their performance and also revealed new interesting features, as oscillating magnetoresistance with number of atomic layers in a multilayered structure. This motivates the need to go beyond the usual theoretical approach of semi-classic…
Relaxation volume tensors quantify the effect of stress on diffusion of crystal defects. Continuum linear elasticity predicts that calculations of these parameters using periodic boundary conditions do not suffer from systematic deviations due to elastic image effects and should be independent of supercell size or sym…
Combining a classical force field, a tight-binding model, and first-principles calculations, we have studied structural, electronic, and optical properties of double-walled carbon nanotube (DWNT) bundles under hydrostatic pressure. We find that the outer tube acts as a protection shield for the inner tube and the inne…
Variation of the geometrical and electronic properties of the gold materials in different dimensions has been investigated by $ab$ $initio$ method, taking into account the spin-orbit (SO) interaction. It is found that SO effects in different dimensional Au materials depend greatly on fundamental symmetry and dimension…
The magnetic-field-dependent longitudinal and Hall components of the resistivity ${\ensuremath{\rho}}_{\mathrm{xx}}(H)$ and ${\ensuremath{\rho}}_{\mathrm{xy}}(H)$ are measured in graphene on silicon dioxide substrates at temperatures $1.6\phantom{\rule{0.3em}{0ex}}\mathrm{K}\ensuremath{\le}T\ensuremath{\le}300\phantom…
Abstract Silica‐alumina (SiO 2 ‐Al 2 O 3 )‐supported palladium catalysts prepared by adsorption of the tetrachloropalladate anion (PdCl 4 2− ) followed by calcination and reduction with either hexanol or hydrogen were studied for the aerobic oxidation of alcohols. The mean size of the Pd particles over the SiO 2 ‐Al 2…
An analytical theory is developed for parametric interactions in metamaterial multilayer structures with simultaneous nonlinear electronic and magnetic responses and with a near-zero refractive index. We demonstrate theoretically that electromagnetic fields of certain frequencies can be parametrically shielded by a no…