Brownian dynamics analysis of magnetic order-disorder transition in a ferromagnetic colloidal system

We carried out Brownian dynamics simulations of a ferromagnetic colloidal s ystem and investigated the particles' motions and the magnetic structures o f the system. The particles' pair correlation functions and the magnetic co rrelation functions are calculated and the formations of chain clusters and magnetic domains are analysed quantitatively. Investigating the magnetic s usceptibility, the specific heat of the system, the magnetic moments' order ing and the magnetisation of the system, the cluster and magnetic character istics of the highly frustrated ferromagnetic system are made clear.