Dresden 2014 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 29: Magnetization Dynamics II

MA 29.1: Vortrag

Mittwoch, 2. April 2014, 15:00–15:15, HSZ 401

Damping due to spin-lattice coupling — •Matthias Assmann and Ulrich Nowak — University Konstanz, 78457 Konstanz, Germany

The Landau-Lifshitz-Gilbert equation is often used for modeling spin dynamics on atomistic length scales. This phenomenological approach to relaxation accumulates all dissipative effects in the damping constant α, no matter whether they are due to interactions with the electronic system or the lattice.
In this talk we present an investigation of the influence of direct spin-lattice coupling on magnetic relaxation processes. We perform spin-molecular dynamics simulations, which take into account the spatial as well as the spin degrees of freedom, both of which are coupled appropriately.
Especially we are interested in the temperature dependence of the relaxation processes. As an example the behavior of small nickel clusters in an external magnetic field will be presented, the resulting damping mechanism as well as the Einstein-de Haas effect.