Dresden 2011 – wissenschaftliches Programm

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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 45: Colloids and Complex Liquids III - External Fields

CPP 45.3: Vortrag

Donnerstag, 17. März 2011, 17:45–18:00, ZEU 114

Ground states of ferrofluid monolayers in the presence of an external magnetic field — •Taisia Prokopieva^1,2, Victor Danilov¹, Sofia Kantorovich^1,2, and Christian Holm² — ¹Ural State University, Lenin av. 51, Ekaterinburg, 620000, Russia — ²Institute fuer Computerphysik, Universitaet Stuttgart, Pfaffenwaldring 27, 70569, Stuttgart, Deutschland

We study the system of magnetic dipolar particles the centres of which are confined in one plane. Particles themselves are free to rotate, thus forming a so called quasi-2D monolayer system [Klokkenburg et al, Phys. Rev. Lett., 2006]. Computer simulations and theoretical studies of these systems were actively performed in the last years both at room temperatures [Kantorovich et al, PCCP, 2008] and at the ground state [Prokopieva et al, Phys. Rev. E, 2009]. All these works however did not consider the possibility to control the structural transitions in such a system by the direction and intensity of the external magnetic field. The latter opens a wide range of new effects. Here we present the combination of Monte Carlo simulated annealing and theoretical modeling to describe the response of a ferrofluid monolayer to the applied magnetic field at low temperature. Our investigations show the dominant role of the magnetic correlations within the monolayer plane, which we characterise in terms of initial magnetic susceptibilities.