Berlin 2008 – scientific programme

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MA: Fachverband Magnetismus

MA 32: Postersession II: Spinstruct./Phase Trans. (1-10); Spinelectronics (11-15); Thin Films (16 - 36); Particles/Clusters (37-45); Multiferroics (46-54); Spindynamics/Spin Torque (55 - 76); Post Deadlines (77-79)

MA 32.75: Poster

Friday, February 29, 2008, 11:15–14:00, Poster E

Investigating the Spin Dynamics in Nanostructures at Finite Temperature — David Bauer, Samir Lounis, Phivos Mavropoulos, and •Stefan Blügel — Institut für Festkörperforschung, Forschungszentrum Jülich

Reading and writing magnetic information on the nanometer scale is one of the key issues in magnetism for information technology. We investigate the dynamics of the magnetization in nanoscale systems on the basis of a classical spin model including e.g. Heisenberg exchange, magnetic anisotropy and an external magnetic field. The spin-system is coupled to a heat-bath through a stochastic force within the Langevin approach [1]. This requires the solution of the stochastic Landau-Lifschitz equations. The pairwise exchange interaction parameters entering our atomistic model are extracted from density functional theory (DFT) calculations. We present preliminary results on the spin dynamics of different nano-objects like monoatomic chains and small islands and investigate the relaxation of the spin-system upon different external parameters such as change of temperature or external magnetic field. Moreover, the thermodynamical properties are shown to be in excellent agreement to those obtained by Monte Carlo simulations.

We gratefully acknowledge financial support from ESF project Self-Assembled Nanoscale Magnetic Networks.

[1] V. P. Antropov, S. V. Tretyakov, and B. N. Harmon, J. Appl. Phys. 81, 3961 (1997).