Materials Literature
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Abstract Styrene/acrylic emulsion copolymer and water‐based short oil urethane alkyd resin were used as binders to prepare water‐based, environmentally friendly paints by using 0.5% emulsified methylamine adduct as corrosion inhibitor. The choice of the two above‐mentioned binders was based on the fact that styrene/ac…
By introducing the s p 3 s * tight-binding model, the band structure and electronic density of states of single-walled carbon nanotubes are calculated. It is found that “metallic” zigzag single-walled carbon nanotubes open gaps about 7 meV–0.2 eV near Fermi level. In addition, the changes of diameter and chiral angles…
Stripe domains caused by perpendicular anisotropy degrade soft magnetic properties of thin films used in recording heads. In this work, the relationship between stress and the susceptibility to stripe domains in soft magnetic thin films is studied theoretically and experimentally. The critical stripe domain onset thic…
The relationship between the oxidized state in a barrier and the bias-voltage dependence on tunnel magnetoresistance (TMR) effect was examined in Co90Fe10/SrTiO3(STO)/La0.7Sr0.3MnO3(LSMO) magnetic tunnel junctions using single crystalline LSMO electrode and STO barrier. A TMR junction, whose STO barrier was fabricated…
We have developed a technique to orient particles of Y-type hexaferrite in which the c axis of the particles is oriented perpendicular to a plane. Disks of oriented Ba2MnZnFe12O22 particles were characterized in static and dynamic field excitations and exhibited the following properties: 4πMs=2300 G, Ha=9500 G, 4πMeff…
The effects of a Ta barrier layer on electromigration and stress migration of Cu films are investigated. The Ta barrier layer enhances both the (111) texture and the median grain size of the annealed Cu films. At 225°C, the electromigration mean time to failure (225°C-MTF) of Ta/Cu/Ta multilayer interconnects is about…
The hole-doped (p) manganite La0.7Ca0.3MnO3 and the electron-doped (n) manganite La0.7Ce0.3MnO3 undergo an insulator-to-metal transition at around 250 K, above which both behave as a polaronic semiconductor. We have fabricated an epitaxial trilayer (La0.7Ca0.3MnO3/SrTiO3/La0.7Ce0.3MnO3), where SrTiO3 is an insulator.…
Abstract The synthesis, mesomorphic character, and effect of spacers in ferrocene‐containing main‐chain liquid‐crystalline polymers are reported in this article. Two different monomers containing ferrocene and phenyl/biphenyl phosphate groups possessing even numbers of spacers from 2 to 10 were prepared and polymerize…
Self-organized ZnO nanosize islands were successfully synthesized by metalorganic chemical vapor deposition on thermally grown SiO 2 layers on Si (111). Investigation by atomic force microscopy showed that the density and size of the ZnO islands were changed by growth conditions. At the growth temperature of 500°C, th…
A comprehensive study on melt-spun 2:17 Sm–Co ribbons prepared at low wheel speed was undertaken in order to understand the effects of composition on the microstructure and formation of crystallographic texture. A high degree of texture was observed in melt-spun SmCo8.5 and Sm(Co0.9Fe0.1)8.5 ribbons prepared at 5 m/s…
X-ray absorption and resonant Auger spectroscopy were used to study the formation and decay of nitrogen and oxygen core excitations in ionic-molecular solid ${\mathrm{NaNO}}_{3}.$ It has been shown that the most prominent features in the electronic structure of both valence and conduction bands of the ${\mathrm{NaNO}}…
Abstract A novel micron‐sized microencapsulated curing accelerator, imidazole (Im), particles, was first prepared by an ultrasound‐assisted dispersing and spray‐drying method and can significantly prolong the shelf life of epoxy resin‐based microelectronic packaging material. The shell of the encapsulated particles wa…
The study of the influence of mechanical stress on magnetic properties of laminated steel is the subject of recent research. In this article the separation of losses is performed and the dependence of total, hysteresis, and excess losses on tensile stress up to destruction is investigated. With increasing of tensile s…
The crystal structure, electronic structure and chemical bonding of Ti 4 AlN 3 have been investigated by ab initio pseudopotential calculations. The equilibrium lattice parameters, atomic positions in the unit cell and bond lengths have been obtained by minimizing the total energy. The differences between the calculat…
A structural study of Fe ultrathin epitaxial films, grown at room temperature on Ni(111), has been performed in the 1.5--18 ML coverage range by angle-scanned photoelectron diffraction. Both backscattering and forward-scattering energy regimes have been employed, in order to enhance the structural sensitivity at lower…
Zn-ferrite films, ZnxFe3−xO4 where the Zn:Fe ratio ranges from 0.36 to 0.76, were grown on glass substrates using a spin spray technique. Films are shown using scanning electron microscopy and atomic force microscopy to be dense and granular with an average grain size ∼0.3 μm. X-ray diffraction indicates that the film…
We have investigated the magnetic properties and crystal structures of α-Fe and Fe21Ni79 nanowire arrays fabricated by ac electroforming into self-ordered nanosized pores in anodic aluminum oxide (AAO). The nanopores were found to have diameters of 5–100 nm and aspect ratios of 300–1000 depending on the anodization co…
We have performed density-functional-based electronic structure calculations on a single Fe8 molecular nanomagnet. Our calculated total moments and local moments are in excellent agreement with experiment. By including spin–orbit coupling we determine the easy, medium, and hard axes and find the ordering of the princi…
La 0.7 Sr 0.3 MnO 3 / Sm 0.7 Sr 0.3 MnO 3 (LSMO/SSMO) nanocomposites were prepared by a sol–gel coating method. The microstructural, magnetic, and transport properties of the composites were investigated. A significant enhancement in magnetoresistance (MR) under an applied field of 5 T is observed from low temperature…
The substitution of Co for Mn in La0.67Sr0.33Mn1−xCoxO3 lowers the Curie temperature TC and the metal–insulator transition temperature TMI, accompanying the increase of the resistivity due to the weakening of the double-exchange interaction. The difference value between the TC and the TMI increases with Co substitutio…