Dresden 2014 – scientific programme
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O: Fachverband Oberflächenphysik
O 74: Surface and Interface Magnetism II (O jointly with MA)
O 74.10: Talk
Thursday, April 3, 2014, 12:45–13:00, WIL C107
Spin state of spin-crossover complexes: from single molecules to ultra-thin films — •Manuel Gruber1,2, Vincent Davesne1,2, Martin Bowen1, Samy Boukari1, Eric Beaurepaire1, Wulf Wulfhekel2, and Toshio Miyamachi2,3 — 1IPCMS (UMR 7504 Université de Strasbourg-CNRS), Strasbourg, France — 2Physikalisches Institut, Karlsruher Institut für Technologie, Germany — 3Institute for Solid State Physics, University of Tokyo, Chiba, Japan
The spin-state bi-stability of spin-crossover molecules [1] can, in principle, be used as building blocks of memory devices. However, it is not obvious if such complexes deposited on surfaces can sustain their controllable bi-stability. In this work, using a scanning tunneling microscope in ultra-high vacuum at 4K, we investigated Fe(1,10-phenanthroline)2(NCS)2 molecules on Cu(100) and Cu(111) surfaces for coverage going from single molecules to ultra-thin films. For sub-monolayer coverage both spin species coexist at low temperatures [2] while this coexistence seems to be lost for the second-layer molecules. We give insights about the origin of this unexpected spin-state coexistence based on the adsorption geometry. Furthermore, we observe voltage-dependent topographies of the second-layer molecules that we tentatively ascribe to a voltage-dependent steady-state combination of HS and LS in a proportion that reflects the bias- and current-dependent switching rates to/from the HS state [3].
[1] P. Gütlich et al., Chem. Soc. Rev. 29, 419 (2000). [2] T. Miyamachi et al., Nat. Commun. 3, 938 (2012). [3] M. Gruber et al., in preparation.