Materials Literature
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In RCu2 compounds (R=rare earth) magnetostriction results from two different sources, the single ion crystal field contribution and the two ion exchange interaction. The crystal field contribution can also be observed above the magnetic ordering temperature and leads to giant magnetostriction in high magnetic fields a…
We report a sensitive surface and feature measurement technique that uses a novel imaging ellipsometer. Polarization signatures from unresolved subwavelength structures are utilized as a sensitive measure of linewidth. A focused beam rigorous coupled wave analysis method is developed to simulate the polarization effec…
Large magnetic entropy change |ΔS| with a nearly temperature-independent magnitude over a wide temperature range (about 70 K span from ∼140 K to 210 K) was observed in an Fe-based NaZn13-type compound LaFe11.375Al1.625. Such a behavior of magnetic entropy change is ascribed to two closely spaced magnetic transitions.…
BaM (barium ferrite) thin films and underlayers (Fe, Cr, Al2O3, Fe2O3, ZnFe2O4, TiO2) were prepared by rf/dc magnetron sputtering on (100) oriented bare Si substrates. The effects of the underlayer on grain orientation, magnetic properties, and microtexture of BaM film were studied. All the BaM films, except BaM/Fe/Si…
We prepared the brownmillerite oxide Ca 2- y La y Co 2- x Al x O 5 and found that it was an n-type conductor. The thermopower and the resistivity of the single crystal are respectively -90 µV/K and 68 mΩcm along the a b direction at 440 K, which suggest relatively good thermoelectrical properties, compared with other…
High quality epitaxial bilayer films of spinel CoFe2O4 (CoF) and M-type hexagonal ferrite BaFe12O19 (BaM) were deposited onto (111) magnesium oxide (MgO) substrate by pulsed laser ablation deposition. X-ray diffraction patterns of both BaM/CoF and CoF/BaM films showed only (0001) BaM, (111) CoF, and (111) MgO peaks. T…
This article describes calculations of ferromagnetic resonance damping rates due to coupling between the magnetization and lattice vibrations through inhomogeneities. The mechanisms we have explored include generation of shear phonons through inhomogeneous anisotropy and generation of both longitudinal and shear phono…
There has been continued technological and research interest in Nd2Fe14B-based compounds due to their excellent intrinsic magnetic properties [(BH)max*∼64 MGOe,Ha∼73 kOe]. It is found that Ti and Zr substitution in Nd2Fe14B leaves its magnetic properties largely unaffected. We have carried out neutron diffraction stud…
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…