Dresden 2006 – wissenschaftliches Programm

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MA: Magnetismus

MA 37: Molecular Magnetism

MA 37.2: Vortrag

Freitag, 31. März 2006, 11:00–11:15, HSZ 403

Frequency Domain Magnetic Resonance Spectroscopy in Molecular Magnetism — •Joris van Slageren — 1. Physikalisches Institut, Universität Stuttgart

In recent years, we have developed an advanced magnetic resonance technique called frequency-domain magnetic resonance spectroscopy (FDMRS) and applied it to the study of a number of phenomena in molecular magnetism. We are interested in the magnetic anisotropy of molecular magnets especially in the form of zero-field splitting of the ground state multiplet. We have shown that FDMRS is a very efficient and accurate method to determine the parameters that describe the magnetic anisotropy. Our aim is to understand the physical origin of the zero-field splitting in exchange coupled clusters, and the role played by the single ion anisotropy and the mixing of spin multiplets. In addition, we have become interested in the (especially dipolar) interaction between single molecule magnets in the crystal and its influence on the magnetic relaxation. To this end we have studied the magnetic resonance lineshape in frozen solutions of single-molecule magnets. Our ability to vary frequency and field independently allows us to perform more sophisticated experiments. For example, we have shown that we can investigate quantum tunneling of the magnetization. Finally we have shown that single molecule magnets can function as efficient Faraday rotators of the radiation polarization in the terahertz frequency range.