Berlin 2005 – wissenschaftliches Programm

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MA: Magnetismus

MA 10: FV-internes Symposium "Molecular Magnetism" (Organizer: H.J. Krüger)

MA 10.1: Hauptvortrag

Samstag, 5. März 2005, 09:00–09:30, TU H1012

The Molecular Approach to Nanomagnetism — •Roberta Sessoli — Department of Chemistry - INSTM, University of Florence, Italy

The observation about 10 years ago of magnetic bistability in molecules comprising a small number of interacting paramagnetic centers have renewed the interest in molecular magnetism. Molecules of this kind, also known as Single Molecule Magnets, have proven to be the ideal systems to investigate quantum effects in the dynamics of the macroscopic magnetization, like the tunnelling effect or the topological interference of tunnelling pathways. The research in the area is still very active and the emerging trends in the field will be the topics of this presentation.

Many efforts are actually devoted to the control of the organization of these molecules, for instance through the preparation of self-assembled monolayers on metallic surfaces. The objectives are the magnetic addressing and investigation of the single molecule as well as the investigation of the environmental effects, that are known to play a crucial role in the quantum dynamics of these objects.

Despite important achievements in the synthesis of new molecules, the blocking temperature, below which bistability is observed, remains quite low. Interestingly a sensible increase has been observed in molecular systems where anisotropic magnetic centers are arranged in 1d structures. These systems can be seen as the molecular analogues of monoatomic nanowires recently investigated.