Materials Literature
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The physical properties of the copper polyaniline vermiculite intercalation compound [Cu(PANI)-VIC] have been studied by x-ray diffraction, electrical resistivity, and dc-magnetic-susceptibility measurements. Aniline is intercalated into the interlamellar space of Cu-VIC, where the ${\mathrm{Cu}}^{2+}$ ions act as oxi…
Raman-scattering spectroscopy has been used to study the folded longitudinal-acoustic (FLA) phonons in three- and four-layer superlattices comprised variously of slabs of GaAs, ${\mathrm{Ga}}_{1\mathrm{\ensuremath{-}}\mathit{x}}$${\mathrm{Al}}_{\mathit{x}}$As, and AlAs. For each superlattice, the observed FLA peak fre…
We study the magnetic properties of soft ferromagnetic cores in the low field linear regime at low temperature (T≤4.2 K) in view of their use in connection with superconducting quantum interference device magnetometers. We have tested several amorphous and polycrystalline alloys in the form of strip-wound toroidal cor…
Thin films of Ba-hexaferrite of the magnetoplumbite structure have been prepared on sapphire substrates of orientation (112̄0), (11̄02), and (0001). Torque magnetometry indicates easy axes parallel, tilted off parallel, and perpendicular to the substrate for the A-, R-, and C-plane substrates. X-ray diffraction shows…
Abstract By means of reflection‐absorption infrared spectroscopy, interfacial interactions were studied between hydrated aluminium and two ethylene copolymers, poly(ethylene‐c‐butyl acrylate) (EBA) and poly(ethylene‐c‐acrylic acid) (EAA). The hydrated aluminium surfaces were obtained by immersion in boiling water, whi…
Remanence studies in recent years have used the characteristics of the Henkel plot and the delta-M plot in the interpretation of interaction field effects in particulate magnetic media. Studies of these two plots in ordered BaFe coatings, however, indicate that both plots give inadequate description of interaction fie…
Moving-type Preisach-derived models computing both the irreversible and the locally reversible components of the magnetization accurately characterize magnetic recording materials exhibiting hysteresis. Experimental results show that the derivative of the major remanent loop is not a symmetrical function of the applie…
Al substitution effects on the magnetic properties of RCo5 (R=Y, Pr, Nd, and Sm) are studied on the basis of magnetic measurements for RCo5−xAlx with x less than 2. The Al substitution considerably decreases the Curie temperature, the Co-sublattice moment, the magnetocrystalline anisotropy of the R sublattice as well…
Amorphous SmCo films were sputter synthesized at room temperature in the presence of strong in-plane magnetic fields. Both in-the-film-plane and perpendicular anisotropy could be formed in the films depending upon the film preparation conditions. Post deposition annealing in the presence of in-plane magnetic fields di…
Using time-resolved high-resolution electron-energy-loss spectroscopy, nonequilibrium adsorption of CO on Pt(111) has been measured and quantitative comparison made with equilibrium absorption over the whole range of coverage between 300 and 100 K. It is unambiguously shown that there is no site conversion of CO betwe…
A new phase δ in the ternary system Nd-Fe-Cu is identified as Nd6Fe13Cu. X-ray powder diffraction patterns of a sample annealed at 540 °C for 1000 h are indexed on a tetragonal unit cell with a=8.09 Å and c=22.26 Å. The Curie temperature Tc is 190±5 °C and the small net magnetization at 4.2 K of 18 mT (2 J T−1 kg−1) a…
The electrical impedance and the optoelectrical impedance due to electron-hole recombination in the depletion layer and at the surface of a semiconductor electrode are calculated. It is shown that both types of impedance follow from a common formula for the ac recombination current density in the external circuit, whi…
When cycling a hysteresis loop, bursts of high frequency ultrasonic waves are emitted. This general phenomenon, which must not be confused with the classical magnetostrictive effect at twice the cycling frequency, is called the magnetoacoustic emission (MAE). By using literature and authors’ results, qualitative and q…
This paper describes the results of a study undertaken to determine the sensitivity and reproducibility of a commercially produced alternating gradient force magnetometer. A noise base of 2×10−8 emu is achievable with an averaging time of 1 s. Reproducibility was found to be within 6% for most samples, but increases t…
The third-order nonlinear optical susceptibility χ(3)(−3ω;ω,ω,ω) of propylmethylpolyazine thin films as measured by the third harmonic generation is reported. The χ(3)(−3ω;ω,ω,ω) values of propylmethylpolyazine that possess statistically alternating methyl and propyl substituents on the carbon atoms along the conjugat…
We have studied the structural properties of Molecular Beam Epitaxy grown thin Co films on α-sapphire (112̄0) substrates by high resolution x-ray scattering measurements in the thickness range of 100 Å to 5000 Å. The electron density profile perpendicular to the film plane was determined by x-ray specular reflectivity…
The magnetoelectric (ME) effect was measured for a single crystal of magnetite below 30 K by means of an alternating current (AC) method. The ME domains were controlled through uniaxial mechanical stress together with a magnetic and an electric field. The ME polarization parallel to the b axis induced by rotating the…
Abstract Ternary blends of PP (80) /rubber (EPM, EPDM) (10) / PE (10) and PP (80) / rubber (10) / CaCO 3 (10) composites were prepared in a twin‐screw extruder. With polyethylene (PE) viscosity comparable to, or higher than that of rubber, the dispersed phase formed a reticulate structure with reduced size. On the con…
Magnetic and magnetoelastic measurements under various conditions of compressive stress and applied field have been carried out on samples with the composition Tb0.3Dy0.7(Fe1−xAlx)1.95, 0≤x≤0.1, prepared by a float-zone growth technique. Their magnetoelastic performances compare favorably with the highly magnetostrict…
A newly developed digital feedback wattmeter, allowing power loss measurements in soft laminations under generic induction waveform is presented. The system is intrinsically free of auto-oscillations, typical drawback of analog feedback circuits, and can therefore be operated in a wide frequency range (0.5 Hz–100 kHz)…