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MA: Fachverband Magnetismus

MA 21: Bio- and Molecular Magnetism II

MA 21.1: Talk

Tuesday, March 15, 2011, 11:00–11:15, HSZ 401

Self assembled Kondo chains: acetylacetonate on Cu(111) — •Stefan Schmaus^1,2, Toshio Miyamachi^1,2, Toyo Kazu Yamada^1,3, and Wulf Wulfhekel^1,2 — ¹Physikalisches Institut, Karlsruhe Institut für Technologie, Germany — ²CFN-DFG Centrum für Funktionelle Nanostrukturen, Karlsruher Institut für Technologie, Germany — ³Graduate School of Advanced Integration Science, Chiba University, Japan

Single molecular magnets (SMM) are discussed as an approach for future magnetic storage. While SMM in the bulk phases posses long term spin stability, for applications they have to be placed on a substrate and additional effects, such as molecule-substrate hybridization, play an important role.

We performed scanning tunneling microscopy (STM) studies on Chromium acetylacetonate (Cr(acac)₃), which posses a spin of 1/2 on the Cr ion. The molecules were sublimed in ultra high vacuum onto a clean Cu(111) surface. The individual molecules as well as ordered molecular chains could be identified in the topographic STM scans. Tunneling spectroscopy, however, showed besides the distinct molecular orbitals a strong zero bias peak, which was identified as a Kondo resonance. Spatially resolved dI/dV maps on the chains showed that the Fano resonance is not only present at the magnetic impurity but is also mediated by the surface state of Cu(111) forming quantum mirages of the Kondo state similar to previous results on single Co atoms on Cu(111) [1].

[1] H. C. Manoharan et al., Nature 403, 512 (2000)