Dresden 2011 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 38: Poster: Colloids and Complex Liquids
CPP 38.37: Poster
Mittwoch, 16. März 2011, 17:00–19:00, P2
Suspensions of particles with shifted magnetic dipoles — •Marco Klinkigt1, Rudolf Weeber1, Sofia Kantorovich1,2, and Christian Holm1 — 1University of Stuttgart, Institute for Computational Physics, Pfaffenwaldring 27, 70569 Stuttgar — 2Ural State University, Lenin av. 57, 620000, Ekaterinburg, Russia
In previous study we investigated the ground state for systems of particles, magnetic moment of which was shifted from the centre of mass, and pointed always outwards radially, using the combination of Monte Carlo simulations and analytical calculations. We showed that antiparallel orientation of moments becomes the most favorable ground state configuration when the shift approaches the particle radius. Our preliminary analysis of relatively small systems at room temperatures also showed a lot of interesting features. To study larger systems we used molecular dynamic simulation to reach better performance. Therefore, we implemented our model in ESPResSo, that allows us to use the P3M algorithm for dipolar long range interactions in systems with periodic boundary conditions in three dimensions. The also implemented MDLC gives us the possibility to simulate monolayers with periodic images in two dimensions. We obtained that the initial slope of the magnetization curves decreases with growing shift parameters. For higher magnetic interaction parameters we find initial slopes lower then the associated Langevin curve. Currently we are carrying out cluster analysis for the systems with different shifts and developing analytical expressions for magnetization laws.