耦合腔磁系统中磁子的压缩

提出了一个在耦合腔 - 磁系统中制备磁子压缩态的方案.该系统由两个内部分别嵌入钇铁石榴石球的微波腔通过超导传输线相互耦合组成,磁子与微波腔之间存在磁偶极相互作用.利用弱压缩真空场驱动其中一个微波腔能够产生磁子压缩态.数值计算结果表明,相比于克尔非线性机制的方案,该方案产生的磁子压缩度更高.该方案可为研究多个磁子的压缩提供参考.     

轻稀土掺杂对TbFeCo材料磁光性能的影响

采用射频磁控溅射方法制备了TbFeCo非晶磁光薄膜 ,并在TbFeCo中分别引入轻稀土元素Nd、Pr和Ce ,测试了薄膜的磁光性能 ,得到磁光薄膜的克尔回线 ;并研究了薄膜成份对其磁光性能的影响 ,比较不同稀土元素的掺杂效果。结果表明 ,在TbFeCo薄膜中掺入一定量的轻稀土元素 ,可改善薄膜的磁光性能 ,提高薄膜的本征克尔角、矫顽力和矩形度。其中 ,Nd掺杂的效果最好 ,掺杂后 ,薄膜的磁光克尔角可达 0 .4 7° ,矫顽力可达 3.4× 10 5A/m。     

NiCo/Cu多层膜的巨磁电阻与磁光克尔效应

本文对用射频磁控溅射方法制备的NiCo／Cu多层膜的层间耦合与磁光克尔效应的内在关联性进行了研究。发现巨磁电阻比与磁光克尔角的幅值1/2随Cu层厚度作同步振荡。其磁光振荡可主要归结于层间耦合引起的铁磁层中电子的光和磁光跃迁的变化。     

Co/Pb多层膜的磁电阻与磁光克尔效应

用射频磁控溅射方法制备了一系列Co／Pb多层膜样品,进而研究了它的磁电阻与磁光性质．发现该系统除Co子层的各向异性磁电阻外还存在由反铁磁耦合导致的约为0．3％的巨磁电阻效应,以及磁光极克尔效应的增强现象,并对磁光增强的可能机制进行了研究．     

Co／Pb多层膜的磁电阻与磁光克尔效应

用射频磁控溅射方法制备了一系列Ｃｏ／Ｐｂ多层膜样品,进而研究了它的磁电阻与磁光性质。发现该系统除Ｃｏ子层的各向异性磁电阻外还存在由反铁磁耦合导致的约为０．３％的巨磁电阻效应,以及磁光极克尔效应的增强现象,并对磁光增强的可能机制进行了研究。     

NiCo／Cu多层膜的巨磁电阻与磁光克尔效应

本文对用射频磁控溅射方法制备的ＮｉＣｏ／Ｃｕ多层膜的层间耦合与磁光克尔效应的内在关联性进行了研究。发现巨磁电阻比与磁光克尔角的幅值（θｋ＾２＋ηｋ＾２）＾１／２随Ｃｕ层厚度作同步振荡。其磁光振荡可主要归结于层间耦合引起的铁磁层中电子的光和磁光跃迁的变化。     

温度变化对锰铋稀土薄膜的矫顽力和磁光克尔转角的影响

锰铋稀土（ＭnBiRE)薄膜具有较大的磁光克尔转角θk，因而作为良好的磁光住处存储材料，用真空蒸镀方法制备了ＭnBiRE（ＲＥ＝Ｃe、Pr、Nd、Sm）薄膜，考察了温度变化对其矫顽力、磁光克尔转角等性能的影响。通过信息的写入，分析了这些样品的读写特性并与四层结构ＴbFeCo样品做了比较。     

锰铋稀土（MnBiRE）磁光薄膜的结构与性能研究

对作为磁光材料的锰铋稀土薄膜的制备、测量进行了阐述，从各项测量结果出发，说明了该材料的磁学性能和磁光性能，在此基础上对其晶体结构进行了分析，提出了对该材料具有相当大的磁光克尔转角的解释。     

磁光盘存贮中偏振信息的检测

磁光盘存贮以磁光克尔效应力基础，为有效地检测出读出光束中包含的偏振信息，用琼斯矢量分析方法，讨论了读取光束偏振态对磁光信号的影响，光学系统中双折射，振幅、位相特性与偏振态的关系。给出了光系统的优化设计，采用高偏振性能光学元件，优化其光学参数，引入相位补偿，消除双折射，相移的影响，保证读光束高线偏振性，增大了读光束尔旋转角，提高了系统的信噪比。     

克尔介质中光场与耦合双原子相互作用系统原子布居数的时间演化特性

研究了存在克尔介质时,双模光场与耦合二能级原子相互作用系统粒子布居数的时间演化规律,讨论了克尔介质与双模光场的耦合强度X、初始平均光子数n0和原子的初态对粒子布居数时间演化的影响.     

Effect of Ag addition on the microstructure and magnetic properties of FePt thin films

FePt thin films and [FePt/Ag]n multilayer thin films were prepared by magnetron sputtering technique and subsequent annealing process. By comparing the microstructure and magnetic properties of these two kinds of thin films, effects of Ag addition on the structure and properties of FePt thin films were investigated. Proper Ag addition was found helpful for FePt phase transition at lower annealing temperature. With Ag addition, the magnetic domain pattern of FePt thin film changed from maze-like pattern to more discrete island-like domain pattern in [FePt/Ag]n multilayer thin films. In addition, introducing nonmagnetic Ag hindered FePt grains from growing larger. The in-depth defects in FePt films and [FePt/Ag]n multilayer films verify that Ag addition is attributed to a large number of pinning site defects in [FePt/Ag]n film and therefore has effects on its magnetic properties and microstructure.     

Bactericidal and Photocatalytie Activity of Fe^3＋-TiO2 Thin Films Prepared by the Sol-gel Method

Pure TiO2 thin films and iron doped TiO2 thin films on glass substrate were prepared by sol-gel method, and characterized by X-ray diffractometer （XRD）, thermo-gravimetric analysis （TG-DSC）, high resolution transmission electron microscope （HRTEM）, scanning electron microscope （SEM） and UV-Vis spectroscopy, respectively. The experimental results show that the pure TiO2 thin films and iron doped TiO2 thin films can destroy most of the escherichia coli and bacillus subtillis under the irradiation of 365 nm UV-light. However, the iron doped TiO2 thin film is a better photocatalyst than pure TiO2 thin film. The ultrastructural studies provide direct evidences for understanding the bactericidal mechanism of the TiO2 photocatalyst.     

微波铁氧体器件薄膜的制备及性能研究

该文采用RF磁控溅射工艺制备了射频薄膜电感用的铁氧体薄膜。为了降低铁氧体薄膜在高频下的涡流损耗、剩余损耗等,通过对铁氧体材料的磁特性分析,研究了不同的温度、成分掺杂对铁氧体磁性能的影响,获得了矫顽力为5.619 6Guss的铁氧体薄膜,并采用SEM、XRD对铁氧体薄膜表面结构进行了表征,采用VSM对薄膜磁性能进行了测试。     

Effects of Nd substitution on magnetic and magneto-optical properties of TbCo/Cr films

NdTbCo/Cr amorphous films with high perpendicular magnetic anisotropy were prepared onto glass substrates by rf magnetron sputtering. The effects of Nd substitution on the magnetic and magneto-optical properties of TbCo/Cr films were investigated. It was found that partial Tb substitution by Nd would increase the saturation magnetization and the Kerr rotation angle, change the temperature dependence of magneto-optical characteristics. These results can be explained by the ferrimagnetic structure of the rare earth-transition metal alloy. When the magnetic layer composition was （Nd0.265Tb0.735）31Co69, a saturation magnetization of 247 emu/cm^3 and a coercivity of 3.8 kOe at room temperature could be obtained.     

数字图像处理技术在荧光磁粉探伤系统中的应用

磁粉探伤是一种利用磁性粉末检查钢铁零件近表面缺陷的方法.为了提高生产效率,解放劳动力,将数字图像处理的相关技术应用到磁粉探伤中.本文介绍了作者设计的航空用钢制轴类工件的荧光磁粉自动探伤系统,从图像的采集、处理和分析3个方面探讨了数字图像处理技术在系统中的具体应用.该算法能较准确、较迅速地定性、定量分析出裂纹缺陷的特征.     

FeS<Subscript>2</Subscript> (pyrite) electrodeposition thin films and study of growth mechanism

With the development of semiconductor solar cells, much attention has been focused on the low-cost, high-performance photovoltaic materials for solar cell fabrications. Sul-fide compounds[1,2], due to their desirable optical properties, were widely used in pre-paring solar cells. Although the Cd-based II-VI compounds solar cell, such as CdS, CdTe, etc.[3,4], processes a higher conversion efficiency than the sulfide-based solar cell does. The iron pyrite (FeS2) characteristic of suitable ba…     

新型光学薄膜研究及发展现状

综述了近年来国内外在新型光学薄膜如高强度激光膜、金刚石及类金刚石膜、软X射线多层膜、太阳能选择性吸收膜和光通信用光学膜的制备及其在器件方面的研究和应用情况，并对光学薄膜的研究进行了展望。     

XPS技术分析离子扩散对TiO2薄膜光催化活性的影响

采用溶胶-凝胶浸渍提拉法在不同玻璃基板上制备TiO2薄膜,通过降解浸渍在薄膜表面的甲基蓝来评价其光催化活性．利用X射线光电子能谱分析TiO2薄膜表面元素,采用平行电极法测定TiO2薄膜的光电流,研究薄膜表面离子扩散情况。结果表明,在相同条件下,光催化活性以石英玻璃为基板的TiO2薄膜较高,而以普通玻璃为基板的TiO2薄膜较低．这是由于在煅烧过程中以普通玻璃为基板的TiO2薄膜,其Na^＋扩散到表面成为电子和空穴的复合中心,降低量子效率所致．     

Transport properties and microstructure of La0.7Sr0.3MnO3 nanocrystalline thin films grown by polymer-assisted chemical solution deposition

Perovskite-based materials can be widely used in the aerospace and transportation field. Perovskite manganese oxides La_0.7Sr_0.3MnO₃ (LSMO) thin films were grown on LaAlO₃ (100) and Si (100) single crystal substrates by the polymer-assisted chemical solution deposition (PACSD) method. Electronic transport behavior, microstructure, and magnetoresistance (MR) of LSMO thin films on different substrates were investigated. The resistance of LSMO films fabricated on LaAlO₃ substrates is smaller than that on the Si substrates. The magnetic field reduces resistance of LSMO films both on Si and LAO in the wide temperature region, when the insulator-metal transition temperature shifts to higher temperature. The low-field magnetoresistance of LSMO films on Si in low temperature range at 1 T is larger than that of LSMO films on LAO. However, the MR of LSMO film on LAO films at room-temperature is about 5.17 %. The thin films are smooth and dense with uniform nanocrystal size grain. These results demonstrate that PACSD is an effective technique for producing high quality LSMO films, which is significant to improve the magnetic properties and the application of automotive sensor.

     

Extracting indium and preparing ferric oxide for soft magnetic ferrite materials from zinc calcine reduction lixivium

A hydrometallurgical process for indium extraction and ferric oxide powder preparation for soft magnetic ferrite material was developed.Using reduction lixivium from high-acid reductive leaching of zinc oxide calcine as raw solution,copper and indium were firstly recovered by iron powder cementation and neutralization.The recovery ratios of Cu and In are 99% and 95%,respectively.Some harmful impurities that have negative influences on magnetic properties of soft magnetic ferrite material are deeply removed ...