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Observation of Exchange Interaction in Iron(II) Spin Crossover Molecules in Contact with Passivated Ferromagnetic Surface of Co/Au(111) |
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| Authors: | Hongyan Chen Hung-Hsiang Yang Timo Frauhammer Haoran You Qing Sun Peter Nagel Stefan Schuppler Ana Belén Gaspar José Antonio Real Wulf Wulfhekel |
| Affiliation: | 1. Physikalisches Institut, Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany;2. Laboratory for Electron Microscopy, Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany;3. Electron Spectroscopy Group, Institute for Quantum Materials and Technologies (IQMT), Karlsruhe Institute of Technology (KIT), 76021 Karlsruhe, Germany
Karlsruhe Nano Micro Facility (KNMFi), Karlsruhe Institute of Technology (KIT), 76344 Eggenstein-Leopoldshafen, Germany;4. Institut de Ciència Molecular (ICMol), Universitat de València, C/Catedrático José Beltrán Martínez 2, 46980 Paterna, Valencia, Spain;5. Physikalisches Institut, Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany Quantum Control Group, Institute for Quantum Materials and Technologies (IQMT), Karlsruhe Institute of Technology (KIT), 76021 Karlsruhe, Germany |
| Abstract: | Spin crossover (SCO) complexes sensitively react on changes of the environment by a change in the spin of the central metallic ion making them ideal candidates for molecular spintronics. In particular, the composite of SCO complexes and ferromagnetic (FM) surfaces would allow spin-state switching of the molecules in combination with the magnetic exchange interaction to the magnetic substrate. Unfortunately, when depositing SCO complexes on ferromagnetic surfaces, spin-state switching is blocked by the relatively strong interaction between the adsorbed molecules and the surface. Here, the Fe(II) SCO complex FeII(Pyrz)2] (Pyrz = 3,5-dimethylpyrazolylborate) with sub-monolayer thickness in contact with a passivated FM film of Co on Au(111) is studied. In this case, the molecules preserve thermal spin crossover and at the same time the high-spin species show a sizable exchange interaction of > 0.9 T with the FM Co substrate. These observations provide a feasible design strategy in fabricating SCO-FM hybrid devices. |
| Keywords: | exchange interaction ferromagnetic coupling molecular magnetism spin-crossover molecules |