金纳米棒三聚体中的等离激元诱导透明

基于金纳米棒构成的三聚体微元结构模型,详细地研究了等离激元诱导透明(plasmon induced transparency,PIT)现象产生的物理过程.研究发现,三聚体的吸收谱线随着其耦合距离以及尺寸的变化,竖直金纳米棒所对应的偶极明模在平行双长条金纳米棒对应的暗模作用下会产生分裂.依据这一结果提出了一个新的物理解释,PIT现象的产生主要来自于竖直金纳米棒中偶极振荡的模式分裂后的相干叠加.同时,考虑到两个振子之间的耦合会伴随着一定的相位关联性,进而引入了耦合相位因子修正了洛伦兹振子耦合模型,解析地研究了耦合相位因子对吸收谱的调控作用和分裂明模之间的相干叠加效应对PIT效应的影响.这为在纳米尺寸范围设计人造原子、光开关、慢光效应等方面的应用提供了理论参考.     

DOMAIN STRUCTURES AND ANISOTROPY IN Pt1-xCux/Co MULTILAYER THIN FILMS

The domain structures of Pt_1-xCu_x/Co multilayer films in as-grown and remanent states have been investigated by using magnetic force microscope. The magnetic domain patterns are strongly influenced by the Cu concentration. For pure Pt/Co multilayer in as-grown state, its domain pattern is depicted as island-like one; however, with the Cu doped in Pt spacer layers, the doman patterns become dot-like, but the island-like domain pattern appears again for the Cu concentration of 14 at%. The domain patterns variation can be attributed to the change of effective perpendicular anisotropy K_ueff due to the effect of Cu atom doped in the Pt spacer layers. Besides, the domain structures of Pt/Co multilayer films in remanent state after the application of various perpendicular magnetic fields have also been studied.     

Pt1-xCux/Co多层膜的结构和磁性

系统地研究了Pt_1-xCu_x/Co多层膜的结构与磁性.除了特定的x=0.10—0.15区间外，在Cu浓度区间x=0.04—0.30内，随着中介Pt层内Cu浓度的增加，导致各向异性K_u和剩余磁化强度M_r⊥的单调下降.这可能是由于Cu原子在Pt层中的无序造成的，使Pt的晶面场对称性发生局域畸变，从而引起上述参数的下降.在特定区域内，可能是形成了PtCu合金的有序相，此时晶场对Co原子的作用就像只有Pt原子一样.这是Cu掺入 关键词：     

自复合材料xLiFePO4·yLi3V2（PO4）3的合成及电化学性能

用固相法合成了不同比例的xLiFePO4.yLi3V2（PO4）3复合物.XRD、SEM和电化学测试仪等分析方法表征了所有样品的特性.结果表明,样品0.95LiFePO4.0.05Li3V2（PO4）3以0.2C的充放电倍率放电时具有162.7 mAh.g-1的电化学容量.同时该样品表现出了较其它样品更优异的循环稳定性...