Study of the optical and structural properties of the (ZnO) membrane, which is prepared by the method of thermal steaming by using the closed oven

This study investigated the optical and structural properties of the (ZnO) membrane, which is prepared by the method of thermal steaming in the vacuum by using the closed oven on glass platforms at room temperature. The crystallization of the membranes prepared by X-ray diffraction pattern was diagnosed. The membranes were found to be polymorphic with hexagonal structure and crystal direction (002), the membranes were annealed for (5,15,25) min at (510°C),the results showed the increased height of peaks with their intensity and decreases in the optical gap energy. The study of optical properties also included the recording of both the absorption spectra and the permeability spectrum of the prepared membranes at the wavelength range (250-1100) nm, Also, the rest of the optical constants were calculated as functions of the photon energy, including (absorption coefficient, extinaction cofficient), Where the value of the absorption coefficient for ZnO thin films varies from (1.4 cm-1 to 2.09cm-1), and the value of extinaction coefficient varies from (0.6 to 0.38). Transmission spectra showed highly transparent films with band gap energy varies ranging from 3.47ev to 3.3 eV. http://dx.doi.org/10.25130/tjps.24.2019.032

Miniaturized Coplanar Waveguide for Nanostructured Magnetostrictive Multilayer Characterization

A miniaturized coplanar waveguide (CPW) on a Y-cut LiNbO3 substrate operating in Radio Frequency region (RF) is proposed for studying of magnetostrictive multi-layered structure. The structure is composed of a 14 × [TbCo2 (3.7 nm)/FeCo (4 nm)] nanostructured multi-layer. Using microtechnology process, the miniaturized CPW has been designed with a 50 µm wide signal line in the frequency range from 6 MHz to 6 GHz. Electromagnetic simulations based on ®Ansys/HFSS demonstrate insertion losses less than 2 dB and show that the magnetic field is more confined in the nanostructured multi-layer placed on top of the micro-sized CPW. By using Vectorial Network Analyzer (VNA) the Ferromagnetic Resonance (FMR) is investigated from the reflection (Sii) or transmission (Sij) coefficients of scattering parameters. An inversion model is finally used to extract the complex permeability spectrum of the thin-film in a large frequency range.

Study of some photic properties of thin membranes of zinc oxide, which is affected by different percentages of aluminum: دراسة بعض الخصائص الضوئية للأغشية الرقيقة لأكسيد الخارصين المشوب بنسب مختلفة من الألومنيوم

The Objectives of this research to prepare Al doped ZnO at ( 10% -20% - 30% - 40 % ) thin films have been prepared by (sol – gel) Technique And the study of some of its optical properties such as absorption , absorption coefficient , Extinction Coefficient and permeability by recording the absorption spectra of UV and visible spectroscopy And processed with Orginal 8.6 program. The study was conducted within the range of wavelengths (300 - 900) nm. Both absorbability, absorption coefficient, Extinction Coefficient and permeability spectrum were studied as a function of wavelength, the absorption values were reduced by increasing the wavelength ratios within the wavelength range of (550-400) nm. The absorbance values were a 0.338 AU for the sample with 10% of the Rates of aluminum doping, Then the absorption values decreased and the lowest value was obtained at 40% aluminum Doped and reached 0.019 AU. It was found that the absorption coefficient also decreases by increasing the doping rate within the same wavelength range The absorption coefficient values were the highest value at 10% aluminum Doped and was 7.7 × 105 cm -1 and decreased with the increase of the doping rate until the lowest value was obtained The aluminum was 40% and the was 3 × 104 cm-1. And the Extinction Coefficient That decreased by increasing the Rates of aluminum doping and obtained the highest value and the equivalent of 0,285 for the sample with a 10% aluminum and then decreased with the increase of the aluminum ratios and reached 0.017 for 40% aluminum , And showed that the permeability of the thin films of zinc oxide increased by increasing the percentage of doping by aluminum according to the ratios specified in the study and the lowest values at the rate of 10% dilution and amounted to 1,9987 and then increased until it reached 2,0023 in the sample with a 40% doping rate.