Theory and Simulation of highly concentrated model ferrofluids in external fields

在这个项目中，我们打算调查的结构和磁性的致密，强相互作用的铁磁流体的计算机模拟和分析计算的手段，采用统计力学理论。特别是，我们将改变密度，偶极耦合，短程粒子间的潜力，多分散性，和外部施加的领域和监测其对结构和磁性的影响。特别感兴趣的是导致铁磁相的机制，以及其他可能的形态相变。特别是，我们将限制系统的2D，以试图重现最近的实验结果的强烈相互作用的铁磁流体产生一个有趣的网络结构，这是一个强大的密度函数。只要时间允许，我们还将研究动态（交流）磁化率，并试图确定粒子协会（链，小球，分形簇）的可能形式，其弛豫时间的特征谱和它们对铁磁流体的宏观磁性的影响。

In this project we intend to investigate the structural and magnetic properties of dense, strongly interacting ferrofluids by means of computer simulations and analytical calculations by employing statistical mechanical theory. In particular we will vary the density, dipolar coupling, short range interparticle potential, polydispersity, and externally applied field and monitor their influence on structural and magnetic properties. Of special interest will be the mechanisms leading to the ferromagnetic phase, and other possible morphological phase transitions. In particular we will confine the system to 2D in order to try to reproduce recent experimental findings of strongly interacting ferrofluids yielding an interesting network structure, which is a strong function of density. As far as time permits we will also investigate the dynamical (ac) susceptibility and try to determine the possible forms of particles associations (chains, globules, fractal clusters), the characteristic spectrum of their relaxation times and their influence on the macroscopic magnetic properties of ferrofluids.