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DY: Fachverband Dynamik und Statistische Physik

DY 2: Statistical Physics (general)

DY 2.8: Talk

Monday, March 14, 2011, 12:15–12:30, ZEU 255

Magnetic Friction: Stokes to Coulomb — •Sebastian Angst, Martin P. Magiera, Alfred Hucht, and Dietrich E. Wolf — Fakultät für Physik, Universität Duisburg-Essen, D-47057 Duisburg

In recent years, the interest in magnetic contribution to friction due to spin correlations has been increased. One intriguing aspect is the energy dissipation by reason of spin waves induced by a moving tip above a substrate of Heisenberg spins [1], modeled with the Landau-Lifshitz-Gilbert equation. In addition, magnetic friction occurs in a driven Ising model [2] investigated by using Monte-Carlo simulations and analytical methods [3]. Until now the dependency of the friction force f on the velocity v is characterized by a Stokes-like behavior for Heisenberg spins and a Coulomb-like behavior for the Ising model.

Here we show that the qualitative characteristics of f(v) are independent on model details like the spin dimensionality, the model geometry or the simulation methods. Using an Ising model in a moving field of different shapes, we demonstrate that the relevant quantity is the time evolution of the field at a given site [4].

[1] M.P. Magiera et al., EPL 87, 26002 (2009)

[2] D. Kadau et al., Phys. Rev. Lett. 101, 137205 (2008)

[3] A. Hucht, Phys. Rev. E 80, 061138 (2009)

[4] to be published