Dresden 2011 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 45: Colloids and Complex Liquids III - External Fields
CPP 45.3: Talk
Thursday, March 17, 2011, 17:45–18:00, ZEU 114
Ground states of ferrofluid monolayers in the presence of an external magnetic field — •Taisia Prokopieva1,2, Victor Danilov1, Sofia Kantorovich1,2, 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.