液相基底上磁性金属及合金薄膜的结构和性能研究

Recently, growth of thin metal films and organic molecular crystals on liquid substrates is one of the central topic in condensed matter physics, which has great theoretical significance to deeply understand various physical phenomena and properties related to free interface. This project will systematically study 3d transition magnetic metal and alloy films deposited on liquid substrates by using the method combining experimental research, Monte Carlo simulation and theoretical calculation, and will reach the following goals. (1) Grasping various experimental conditions to grow megnetic films on liquid substrates and discovering the growth mechanism of these films; (2) Determining various structure characteristics (including film component, microstructure, crystal structure and magnetic domain structure) of the samples and discovering the relations between the structures and experimental conditions; (3) Determining various electric and megnetic properties (such as AC/DC electric property, temperature-resistance character, Curie temperature, coercivity, magnetic anisotropy and magnetoresistance effect etc.) of the samples and discovering the inherent relations between the physical properties and structure characteristics. Through these studies, we will well know the influence of liquid substrates on growth mechanism of magnetic films, fully understand the influence of free interface condition on film structures and properties, preliminarily establish the framework system of growth and physical effects of magnetic films on liquid substrates, and lay the solid theoretical and experimental foundation for practical applications.

以液相为基底生长金属薄膜和有机分子晶体是近年来凝聚态物理中备受关注的研究热点，对深刻理解各类与自由界面相关的物理现象和性能具有重要的理论意义。本项目拟采用实验研究、Monte Carlo模拟和理论计算相结合的方法，对沉积在液相基底上的3d过渡族磁性金属及合金薄膜进行深入研究，将达到以下目标。（1）掌握液相基底上生长磁性薄膜的各种实验条件，揭示此类薄膜的生长机理；（2）确定样品的各结构参量（如薄膜组分、微观结构、晶体结构和磁畴结构)，揭示其与实验条件之间的关系；（3）确定样品的各类电磁性能（如交直流电特性、阻温特性、居里温度、矫顽力、磁各向异性、磁阻效应等），揭示其与各结构参量之间深刻的内在联系。通过这些研究，深刻认识液相基底对磁性薄膜成膜机理的影响，充分理解自由界面条件对薄膜结构和电磁性能的影响，并初步建立液相基底上磁性薄膜的生长及物理效应的框架体系，为实际应用奠定坚实的理论和实验基础。

以液相为基底生长金属薄膜和有机分子晶体是近年来凝聚态物理中备受关注的研究热点，对深刻理解各类与自由界面相关的物理现象和性能具有重要的理论意义。本项目研究工作按照研究计划全面展开，并在多方面取得了较好进展。根据研究计划，我们选用多种液相和柔性材料作为薄膜沉积的基底，包括不同粘滞系数的扩散泵硅油、聚二甲基硅氧烷（PDMS）、胶体等，采用真空蒸发和磁控溅射等方法在液相基底上制备磁性金属及合金薄膜，深入研究了薄膜的成膜规律、结构特征和物理性能，重点研究了应力对该类薄膜的结构和性能的调控效应及物理机制。该研究结果有助于深刻认识液相基底对金属薄膜成膜机理的影响，充分理解自由界面条件对薄膜结构和电磁性能的作用，并初步建立液相基底上金属薄膜的生长及物理效应的框架体系，为实际应用奠定坚实的理论和实验基础。