Materials Literature
按标题、摘要、年份、主题和来源检索公开元数据。结果保留作者、摘要、分类与原始来源链接。
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)…
We present angle-resolved inverse-photoemission (IPE) spectroscopy data from the nearly perfect ${\mathrm{TiO}}_{2}$(110) surface. Results from two high-symmetry directions of the surface Brillouin zone, \ensuremath{\Gamma}\ifmmode\bar\else\textasciimacron\fi{}-X\ifmmode\bar\else\textasciimacron\fi{} and \ensuremath{\…
While the scalar Preisach model has long served as a description of hysteretic processes, the response of ferromagnetic materials is essentially vector in character and scalar models are likely to fail in important respects for many advanced applications. A 2D vector Preisach model has been developed for the simulatio…
The frequency response of the magnitude and phase of the dynamic relative permeability of Terfenol-D (Tb0.27Dy0.73Fe2) has been measured for low drive fields (a few hundred A m−1 rms) and the energy loss per cycle determined. The data shows that when eddy current shielding is not significant, the frequency dependence…
Nickel ferrites have been produced by the rf plasma deposition technique for the first time. This technique has promise for large scale fine particle production of ferrites. Powder x-ray diffraction linewidth measurements show an average particle size of about 55 nm. Mossbauer measurements show the presence of both th…
The possibilities for fabricating solid solutions of (Ba1−x,Srx)TiO3 (x≤0.5,1.0) by crystallization of amorphous films and for improving their dielectric properties by adjusting the Sr content were investigated. Thin amorphous films were prepared from powder targets consisting of mixtures of BaTiO3 and SrTiO3 by sputt…
Bithiophene is studied with varying Cs dosing as a model for the n-doping of thiophene-based conducting polymers. The evolution of the electronic structure with increasing Cs concentration is followed both indirectly, by electron-energy-loss spectroscopy (EELS), and directly by ultraviolet-photoemission spectroscopy (…
A high-performance and inexpensive hysteresis loop tracer has been developed to measure quasistatic (0.02 Hz or less) hysteresis loops of soft ferromagnetic materials. It was applied very successfully to measure straight pieces of amorphous and nanocrystalline ribbons and amorphous wires. Especially high-magnetic-fiel…
High-coercivity, high-remanence permanent magnet materials have been obtained via a crystallization treatment of amorphous (Nd,Dy)xFe80.5−x−yCoyB18.5M1 alloys for 3≤x≤5 and 0≤y≤5, where M represent the additives Al, Si, Cu, Ga, Ag, and Au. It has been found that addition of Co and M results in a significant reduction…
The magnetic properties of R2Co14B1−xCx (x=0, 0.5 and R=Y, Sm) compounds have been studied by measuring the temperature dependence of the easy- and hard-magnetization curves on magnetically aligned samples between 1.5 and 300 K for Y2Co14(B,C) and at 4.2 K for Sm2Co14(B,C). The magnetic anisotropy of Y2Co14B increases…
A micromagnetic simulation program has been used to calculate the magnetoresistance of a free-standing 4 μm×1 μm×200 Å Permalloy strip for a variety of numerical hysteresis loops in which a constant bias field is applied along the easy axis and a variable field is applied along the hard, in-plane axis. The main purpos…
Magnetic properties of Sm1−xPrxCo4−yFeyB with various values of x and y have been observed mainly from the viewpoint of permanent magnet material. Pr substitution for SmCo4B results in an increase of the saturation moment; however, it leads to a decrease of the anisotropy field. The Curie temperature remains constant.…