Signatures of Molecular Magnetism in Single-Molecule Transport Spectroscopy

Details Signatures of Molecular Magnetism in Single-Molecule Transport Spectroscopy Signatures of Molecular Magnetism in Single-Molecule Transport Spectroscopy

2006-03-09

arxiv.org/abs/cond-mat/0603276v1

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Scientific paper

Single-molecule transistors provide a unique experimental tool to investigate the coupling between charge transport and the molecular degrees of freedom in individual molecules. One interesting class of molecules for such experiments are the single-molecule magnets, since the intramolecular exchange forces present in these molecules should couple strongly to the spin of transport electrons, thereby providing both new mechanisms for modulating electron flow and also new means for probing nanoscale magnetic excitations. Here we report single-molecule transistor measurements on devices incorporating Mn12 molecules. By studying the electron-tunneling spectrum as a function of magnetic field, we are able to identify clear signatures of magnetic states and their associated magnetic anisotropy. A comparison of the data to simulations also suggests that electron flow can strongly enhance magnetic relaxation of the magnetic molecule.

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