Dresden 2011 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 59: Spin Excitations II/ Spin Scattering

MA 59.6: Vortrag

Donnerstag, 17. März 2011, 18:30–18:45, HSZ 04

Magnetic friction in the Heisenberg spin chain — •Martin Magiera, Sebastian Angst, Alfred Hucht, and Dietrich E. Wolf — Faculty of Physics and CeNIDE, University of Duisburg-Essen, D-47048 Duisburg, Germany

Friction forces in purely magnetically interacting systems have been neglected for a long time, although they offer a broad spectrum of phenomena as recent studies show. We present theoretical calculations and simulations of the Heisenberg spin chain, scanned by a magnetic field with a constant velocity, where friction force may appear in a Stokesian way (force proportional to scanning velocity). In the same system additional (higher order) contributions due to spin wave excitations may be present. Finally the system may show non-adiabatic behavior, yielding a Coulomb friction force, which does not depend on velocity. In this talk we focus on the crossover from the Stokes- to the Coulomb-regime. This crossover can also be observed in the Ising model.