SKM 2023 – wissenschaftliches Programm
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MA: Fachverband Magnetismus
MA 19: Molecular Magnetism I
MA 19.5: Vortrag
Dienstag, 28. März 2023, 16:15–16:30, HSZ 04
Observation of exchange interaction in Iron(II) spin crossover molecules in contact with passivated ferromagnetic surface of Co/Au(111) — •hongyan chen1, hung-hsiang yang1, timo frauhammer1, haoran you1, qing sun2, peter nagel3,4, stefan schuppler3,4, ana belén gaspar5, josé antonio real5, and wulf wulfhekel1,3 — 1Physikalisches Institut, Karlsruhe Institute of Technology (KIT), Germany — 2Laboratory for Electron Microscopy, KIT — 3Institute for Quantum Materials and Technologies, KIT — 4Karlsruhe Nano Micro Facility, KIT — 5Institut de Ciència Molecular, Universitat de València, Spain
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 with sub-monolayer (sub-ML) 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 more than 0.7 T with the FM Co substrate. These observations provide a feasible design strategy in fabricating SCO-FM hybrid devices.