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Your search keyword '"Xu, X. G."' showing total 480 results
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480 results on '"Xu, X. G."'

168. The effects of tungsten concentration on crystalline structure and perpendicular magnetic anisotropy of Co-W films.

Author

Wu, Y., Xu, X. G., Jiang, Y., Yin, S. Q., Wang, H., and Wang, J. P.

Subjects
*PERPENDICULAR magnetic anisotropy, *MAGNETRON sputtering, *DIRECT currents, *COBALT, *TUNGSTEN films, *THERMODYNAMIC functions, *BINARY metallic systems
Abstract

In this study, Co-W thin films deposited by DC magnetron sputtering were demonstrated to be perpendicular magnetic anisotropic with large magnetocrystalline anisotropy energy (MAE). Thermodynamic calculations based on Miedema's semiempirical model have been used to estimate the phase in this binary alloy system. Based on the thermodynamic calculations results, a series of Co-W thin films were deposited on amorphous Ta underlayer with different tungsten concentrations. According to the X-ray diffraction results, the crystal structure of Co-W thin films is consistent well with that of thermodynamic calculations. Large MAE of Co-W thin films can be obtained with Ku over 2.1 x 105 J/m³ after vacuum annealing. The perpendicular coercivity (Hc) of Co-W thin film reaches 9.1 x 104 A/m. Therefore, the Co-W thin film is considered as a potential choice of high-density magnetic recording media materials. [ABSTRACT FROM AUTHOR]

Published
2014
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175. Thermal and mechanical properties of BaWO4 crystal

Author

Ge, W. W., primary, Zhang, H. J., additional, Wang, J. Y., additional, Liu, J. H., additional, Xu, X. G., additional, Hu, X. B., additional, Jiang, M. H., additional, Ran, D. G., additional, Sun, S. Q., additional, Xia, H. R., additional, and Boughton, R. I., additional

Published
2005
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198. Influence of microstructure on optical behaviour of freshwater cultured pearls.

Author

Fu, F., Tian, L. G., Xu, X. G., Xu, S., and Hu, X. B.

Abstract

The relationship between optical behaviour and microstructure of pearl was studied by laser scanning confocal microscopy, high resolution scanning electron microscopy and atomic force microscopy. There are three optical effects in pearls, namely, the reflection-diffraction effect, a chromatic diffusion halo and the whispering gallery effect. From the structure observation for pearls, we proposed that the first optical effect exhibited by pearls is dominated by the surface diffuse reflection. In addition, the multilayer interference and diffraction have little contribution. With delicate observation for the structure of pearl by an atomic force microscope, it is revealed that the polygon platelets of pearl are not single crystals but nanograins of aragonite in the network of organic matrix, which is responsible for the chromatic diffusion halo. As for the third optical effect, it originates from the stratification structure, which is composed of aragonite platelets. When the light falls on the surface of the pearl, it will travel along the laminations of its structure rather than through the whole pearl, so the rim of the pearl is bright even if no light falls on the surface directly. [ABSTRACT FROM AUTHOR]

Published
2014
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