CoPt和FePt纳米微粒具有L10 有序结构，可作为下一代高密度磁存储材料，是功能材料研究的热点。然而，低维固体有序无序相变动力学研究进展缓慢，不同基体对于微粒相变影响机理也不清楚。如果能够综合热力学和动力学理论阐明磁性合金颗粒的有序无序相变机理，则可大大促进该类材料的理解和应用。本项目拟研究CoPt和FePt微粒相变热力学和动力学。一方面，利用蒙特卡罗模拟和分子动力学模拟方法研究不同成分、不同尺寸CoPt和FePt微粒转变动力学以及影响转变的因素；另一方面，利用脉冲激光沉积法制备出非晶碳基体、非晶氧化镁基体上不同尺寸有序的CoPt和FePt微粒，研究基体对于微粒有序无序转变的影响；基于模拟和实验研究结果，建立起能够有效预测合金微粒有序无序转变的热力学和动力学模型。本项目的完成可望将相变理论拓展到低维体系，并将为CoPt和FePt磁性微粒的设计、制备和应用提供重要帮助。

CoPt and FePt nanoparticles with L10 ordered structure, regarded as the ultra-high magnetic storage media of next generation, have been a hot issue in the field of functional nanomaterials. However, the dynamics of transition, as well as the matrix effect on transition, need further investigation, which can improve the understanding and application of CoPt and FePt particles. In this project, the thermodynamics and dynamics of order-disorder transition will be studied deeply. On one hand, the composition and size effects on the dynamics of CoPt and FePt particles will be simulated by molecular dynamics and Monte Carlo method; on the other hand, the ordered CoPt and FePt particles on amorphous carbon and amorphous MgO will be prepared using pulsed laser deposition method, in order to study the matrix effects. Based on simulation and experiments, the thermodynamic and dynamic model will be established for application purpose. The present research will not only extend the theory of phase transition of bulk solids into nanoscale, but also contribute much to the design, preparation and application for CoPt and FePt particles.