Berlin 2015 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 27: Nanostructures: Low Dimensions
O 27.4: Vortrag
Dienstag, 17. März 2015, 14:45–15:00, MA 005
Surface self-assembly of Fe4 single molecule magnets — Philipp Erler1, Nicole Barth1, Peter Schmitt2, •Luca Gragnaniello1, and Mikhail Fonin1 — 1Fachbereich Physik, Universität Konstanz, 78457 Konstanz, Germany — 2Fachbereich Chemie, Universität Konstanz, 78457 Konstanz, Germany
Here, we present a successful fabrication of self-organized nanoislands of Fe4(dpm)6L2 (Fe4) single molecule magnet (SMM), by using h-BN/Rh(111) as template. Fe4 clusters are a promising class of molecules whose magnetic properties have recently raised great interest, due to their capability to retain their SMM behavior when chemically grafted on a gold substrate [1]. However, Fe4 brittleness limits their thermal stability, hindering direct evaporation of the molecules in ultra-high vacuum (UHV) in most cases [2] and, consequently, a thorough investigation via scanning tunneling microscopy and spectroscopy (STM/STS). We overcome this problem by using electrospray as a gentle deposition method in UHV. The structural and electronic properties of sub-monolayers and individual molecules were studied by means of low temperature STM/STS. Despite the complexity of their structure, highly ordered arrays of Fe4 molecules on the h-BN substrate can be obtained, therefore providing a promising playground to explore their electronic and magnetic properties in a well-defined configuration.
[1] M. Mannini et al., Nature Mater. 8, 194 (2009); M. Mannini et al., Nature 468, 417 (2010). [2] Allowed only by a specific Fe4 derivative (see L. Margheriti et al., Small 5, 1460 (2009).