Berlin 2008 – wissenschaftliches Programm

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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 32.69: Poster

Freitag, 29. Februar 2008, 11:15–14:00, Poster E

Spin tunneling in molecular magnets on a dissipative environment — •juan manuel florez, patricio vargas, and alvaro nuñez — Physics Department, Universidad Técnica Federico Santa María, P.O.Box 110-V,Valparaíso, Chile

We report on our latest progress on the theoretical study of dissipative effects on the tunneling properties of the spin degree of freedom in molecular magnets. Starting from a simple microscopic model of the interaction between the molecule and an environment we characterize generic consequences of the dissipative effects on the tunneling process. The dynamic changes of the spin degree of freedom are evaluated within a suitable generalized instanton approximation in order to characterize the sensitivity of the tunneling variables to the degrees of freedom of the thermal environment. In particular the tunneling rates and their field dependence are described in detail.