Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 65: Metal substrates: Adsorption of organic / bio molecules VII
O 65.2: Vortrag
Donnerstag, 17. März 2011, 11:30–11:45, PHY C213
Switching behavior of double-decker single molecule magnets on a metal surface — •yingshuang fu1, joerg schwoebel1, andrew dillulo2, germar hoffmann1, jens brede1, svetlana klyatskaya3, mario ruben3,4, and roland wiesendanger1 — 1University of Hamburg, Hamburg, Germany — 2Ohio University, Athens, USA — 3Karlsruhe Institute of Technology, Karlsruhe, Germany — 4Université de Strasbourg, Strasbourg, France
Single molecule magnets (SMM) are most promising materials for spin based molecular electronics. Due to their large magnetic anisotropy stabilized by inside chemical bonds, SMM can potentially be used for information storage at the single molecule level. For applications, it is of importance to adsorb the SMM onto surfaces and to study their subsequent conformational, electronic and magnetic properties.
We have investigated the adsorption behavior of Tb and Dy based double-decker SMM on an Ir(111) surface with low temperature scanning tunneling microscopy and spectroscopy. It is found that Tb double-decker molecules bind tightly to the Ir(111) surface. By resonantly injecting tunneling electrons into its LUMO or HOMO state, the Tb double-decker molecule can be switched from a four-lobed structure to an eight-lobed structure. After switching, energy positions of the HOMO and LUMO states both shift closer to the Fermi level. Dy double-decker molecules also exhibit the same switching properties on the Ir(111) surface. The switching behavior of the molecules is tentatively attributed to a conformational change of the double-decker molecular frame.