Phase separation dynamics in a two-dimensional magnetic mixture

Details Phase separation dynamics in a two-dimensional magnetic mixture Phase separation dynamics in a two-dimensional magnetic mixture

2011-09-30

arxiv.org/abs/1109.6756v1

Physics

Condensed Matter

Soft Condensed Matter

15 pages, 10 figures

Scientific paper

Based on classical density functional theory (DFT), we investigate the demixing phase transition of a two-dimensional, binary Heisenberg fluid mixture. The particles in the mixture are modeled as Gaussian soft spheres, where one component is characterized by an additional classical spin-spin interaction of Heisenberg type. Within the DFT we treat the particle interactions using a mean-field approximation. For certain magnetic coupling strengths we calculate phase diagrams in the density-concentration plane. For sufficiently large coupling strengths and densities, we find a demixing phase transition driven by the ferromagnetic interactions of the magnetic species. We also provide a microscopic description (i.e., density profiles) of the resulting non-magnetic/magnetic fluid-fluid interface. Finally, we investigate the phase separation using dynamical density functional theory (DDFT), considering both nucleation processes and spinodal demixing.

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