钇铝石榴石上Mn-Co-Ni-O薄膜的制备及其相关特性表征

利用化学溶液法在具有良好导热性和红外透过性的钇铝石榴石单晶衬底上成功制备了具有单一尖晶石相的Mn1.56Co0.96Ni0.48O4薄膜.傅里叶红外光谱测试表明薄膜在2.5~5μm波段具有明显的吸收带.通过研究其电阻-温度关系并利用最近邻跳跃模型进行拟合,得到薄膜的特征温度约为2 530 K,室温下的负电阻温度系数约为-3.66%K-1.     

单片机控制的光学电流互感器偏振调制效应

带有永磁薄膜的石榴石是光学电流互感器的敏感元件。文中介绍了带有永磁薄膜的石榴石和未带膜的石榴石分别在单片机的控制下旋转,旋转的过程中同时观察和记录DOP的值,而DOP(偏振度)是光束中偏振部分的光强度和整个光强度之比。实验得出:无镀膜的石榴石对入射激光的偏振性没有影响,但带有薄膜的石榴石不仅可调制入射光的偏振特性,且调制的DOP值域范围相对于光通过无序介质等方法更大,研究结果为石榴石型光电式电流互感器的测量精度及结构改进提供了理论基础。     

Si Underlayer Induced Nano-Ablation in AgInSbTe Thin Films

AgInSbTe/Si thin films on glass substrates are prepared by dc magnetron sputtering at room temperature. Using Si underlayer as the thermal diffusion layer, the super-resolution nano-ablation holes with a size of 70hm in the AglnSbTe phase change films are obtained by a far-field focused laser experimental setup, with laser wavelength 405 nm and objective-lens numerical aperture 0.90. The nano-ablation formation mechanism is analysed and discussed via the thermal diffusion of sample structures.     

Below-diffraction-limited hybrid recording using silicon thin film super-resolution structure

We report on new experimental results for below-diffraction-limited hybrid recording. In our experiments, by means of focused laser assisted magnetic recording, the magnetic domains within TbFeCo thin films are obtained under an external perpendicular direct magnetic field. For a single magnetic medium, the domain size is mainly determined by the focused spot, which is about 620~nm for the laser wavelength λ =406~nm, and a numerical aperture of the lens of 0.80. However, when a silicon thin film structure is inserted between the substrate and the magnetic medium, the recording domains can be reduced obviously. By optimizing the experimental condition, even the size can be reduced to about 100~nm, which is below the diffraction limit, i.e. about 1/6 of the spot size. This is very useful for improving the hybrid recording density in practical applications.     

石榴石型偏振调节器温度效应研究

采用磁控溅射法制备了石榴石型偏振调节器并研究了温度对其的影响.利用斯托克斯偏振仪和CCD,研究激光透过石榴石及石榴石型偏振调节器的偏振极化性质和光斑变化.实验结果表明:在25～75℃温度范围内,激光穿过不同材料时,斯托克斯参量变化趋势不同;但是因方位角不改变,激光的偏振度、线偏振度、圆偏振度基本不变.