Dresden 2017 – wissenschaftliches Programm

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MA: Fachverband Magnetismus

MA 65: Poster 2

MA 65.4: Poster

Freitag, 24. März 2017, 09:30–13:00, P2-OG1

The Emegence of Cooperativity in the Coverage-Dependent Temperature and Light-Induced Spin-State Switching of an Fe(II) Complex Adsorbed on a Graphite Surface — •Lalminthang Kipgen¹, Holger Naggert², Matthias Bernien¹, Fabian Nickel¹, Lucas M. Arruda¹, Andrew J. Britton¹, Sascha Ossinger², Felix Tuczek², and Wolfgang Kuch¹ — ¹Institut für Experimentalphysik, Freie Universität Berlin, Arnimallee 14, 14195 Berlin, Germany — ²Institut für Anorganische Chemie, Christian-Albrechts Universität zu Kiel, 24098 Kiel, Germany

The spin-state manipulation from high-spin state (HS, S=2) to low-spin state (LS, S=0) or vice versa of spin crossover molecules adsorbed on a surface has been of much interest due to its potential for applications in spintronic devices. We report on the complete spin-state switching from the sub-monolayer to multilayer coverage of an Fe(II) complex deposited on a highly oriented pyrolytic graphite surface with temperature and light. For a sub-monolayer coverage, the thermal spin transition is rather gradual between 300 K to 70 K and can be fitted well as a system of non-interacting molecules along the Vant Hoff's model. With the increased in coverage, the transition becomes more abrupt, which is attributed to increase cooperativity between the molecules.