Papers by Author: Shui Yuan Chen

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Authors: Heng Lai, Zhi Gao Huang, Rongquan Gai, Shui Yuan Chen, You Wei Du
Abstract: The thin polycrystalline Co films with different annealed time were prepared by magnetron sputtering method. XRD and hysteresis loops of the samples were measured. A mean field equation with Heisenberg model for calculating dynamic scaling was derived. The experimental and simulated results indicate that, the scaling law, A=A0+H0 a ω b, describes well dynamic magnetization along easy and hard axes for the anisotropy magnetic films; the anisotropy scaling exponents exist clearly in the anisotropy films; the simulated results are consistent with the experimental those.
Authors: Lei Tang, Shui Yuan Chen, Hui Qin Zhang, Zhi Gao Huang
Abstract: In this paper, Pulsed laser deposition (PLD) is attempted to be an alternative synthesis method for Cu-Ga-In (CIGS) thin films. Cu-In-Ga prefabricated metal films were grown on the quartz substrates by PLD method. Then the CIGS films with different Se content were synthesized by the post-selenization(Se)-annealing processes. The structure, element component proportion and optical properties of the CIGS films were investigated. The experimental results indicate that the CIGS films can be well obtained by the PLD method with Se-annealing. The performances of the CIGS films are much affect by the Se-annealing processes, including Se-annealing temperature, annealing time, and the way of Se-annealing. The CIGS films prepared by PLD method with Se-annealing present fine visible light absorption properties.
Authors: Hong Zhang, Shui Yuan Chen, Su Zhen Tang, Wen Pao Ke, Heng Lai, Zhi Gao Huang
Abstract: La2/3(Ca0.6Ba0.4)1/3Mn1-xVxO3 (x=0, 0.03, 0.05, 0.07, 0.10, 0.15, 0.20) nanoparticles were synthesized using sol-gel technology. The experimental results reveal that, (1) the substitution of V for Mn in La2/3(Ca0.6Ba0.4)1/3Mn1-xVxO3 lowers the Curie temperature TC and the metal–insulator transition temperature TMI; (2) there exists the evident difference between the TC and the TMI for different V substitution ratio; (3) the low-temperature tunneling magnetoresistance and maximum magnetoresistance near Tc increase with the enhancement of V-doping content. Based on the tunneling magnetoresistance model and the percolation model near Curie temperature, the experimental results are explained well.
Authors: Qing Ying Ye, Shui Yuan Chen, Ke Hua Zhong, Xiu Lai Chen, Zhi Gao Huang
Abstract: Based on the Monte-Carlo simulation and fast Fourier transformation-micro-magnetism (FFTM) method, magnetic properties with different parameters for the 4×4 Magnetic Quantum Dot Arrays (QDA) were studied. The calculating processes show that the same calculated results can be obtained by both methods above. But the FFTM method can save much time in obtaining results, which suggest that the method be employed to study more complex systems. The calculated results indicate that there exists obvious difference in the magnetic hysteresis loops with different temperatures, which can be well explained by considering the relationship between the easy-magnetization axis and the organization anisotropy of the QDA system. Furthermore, saturation field (Hs) increases with the dipolar interaction increasing, which is attributed to the competition between dipolar energy (ED) and Zeeman energy (EZ). The calculated results can fit the experimental results very well. Besides, it is found that the dipolar interaction constant D has a great influence on magnetic properties.
Authors: Shui Yuan Chen, Zhi Gao Huang, Heng Lai, Rongquan Gai, Feng Ming Zhang, You Wei Du
Abstract: Ferromagnetic (FM) La2/3(Ca0.6Ba0.4)1/3MnO3 and antiferromagnetic (AFM) NiO nanoparticles were synthesized using sol-gel method, respectively. La2/3(Ca0.6Ba0.4)1/3MnO3 (1 mol)/ x NiO (x= 0, 0.05 and 0.15mol) composites with the coated NiO were prepared. The experimental results indicate that, both phases of LCBMO and NiO coexist clearly in the composites and the sizes of the NiO nanoparticles in the intergranular region between the LCBMO particles are very small; the interface of NiO influences evidently the value of MR and it is found that the tunneling MR for x=0.05 is the largest in three samples. The magnetoresistance behavior has been explained by two-level model of tunneling magnetoresistance and percolation model well.
Authors: Bing Lin Hu, Zong Zhen Li, Hui Qin Zhang, Shui Yuan Chen, Qing Ying Ye, Ji Fu Zhao, Yang Zhao, Zhi Gao Huang
Abstract: Bi1-xLaxFeO3(x=0, 0.3) thin films were deposited on glass/ITO substrates through Sol-Gel Dip-Coating method and rapid annealing process. The structures were detected by X-ray diffraction patterns, Raman spectrometer and scanning electron microscopy. The magnetic, ferroelectric and optical properties of the films were studied by vibrating sample magnetometer, ferroelectric integrate tester and photovoltaic performance testing system, respectively. The experimental results indicate that BiFeO3 thin film presents rhombohedral perovskite structure and Bi0.7La0.3FeO3 films showed distorted perovskite structure, which were confirmed by XRD patterns and Raman spectrometer. The magnetism and ferroelectric properties of the films were obviously enhanced by La doping. Furthermore, the photocurrent response and photovltaic effect in BLFO thin films were detected.
Authors: Qing Ying Ye, Shui Yuan Chen, Zhi Ming Lin, Hong Ying Xiong, Xiu Wan Yang, Ling Fang Li, Ling Gao, Zhi Gao Huang
Abstract: In this paper, Fe nanoring model of different degree of eccentricity has been made. Based on the FFTM method and MC simulation method, the magnetic properties of the Fe nanoring, such as hysteresis loops, spin configuration, have been studied. The simulated results indicate that there are typical hysteresis loops and spin-configurations, such as onion-type state and vortex-type state in the system of symmetric Fe nanoring. The hysteresis loops of the eccentric Fe nanoring are similar to symmetric system when the degree of eccentricity is small, but as the degree of eccentricity increased, the magnetization behavior become different. Remanence is almost linearly related to the degree of eccentricity in the system of eccentric Fe nanoring, which can be explained by analyzing the change of spin-configurations in the eccentric Fe nanoring.
Authors: Ji Fu Zhao, Shui Yuan Chen, Gui Lin Chen, Qing Ying Ye, Bing Lin Hu, Zhi Gao Huang
Abstract: As a promising absorber layer, semiconducting Cu2ZnSnS4 (CZTS) can be applied to replace the organic dye in dye-sensitized solar cell for photovoltaic application because of its good stability, suitable band gap energy (~1.5eV) and large absorption coefficient (~104 cm-1). In this paper, successive ionic layer adsorption and reaction (SILAR) method was utilized to deposit CZTS nanoparticles on mesoporous titanium dioxide (TiO2). This solar cell with carbon film coated FTO glass slide as the back electrode showed an open circuit voltage of 380 mV. Preliminary results obtained for solar cells fabricated with this material are promising.
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