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journal article·2023-06Open access

Observation of Exchange Interaction in Iron(II) Spin Crossover Molecules in Contact with Passivated Ferromagnetic Surface of Co/Au(111)

Hongyan Chen, Hung‐Hsiang Yang, Timo Frauhammer, Haoran You, Qing Sun, Peter Nagel, Stefan Schuppler, Ana Belén Gaspar, José Antonio Real, Wulf Wulfhekel

Small· Volume 19· Issue 22
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Abstract

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.
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Research context

Composites

OpenAlex topics: Magnetism in coordination complexes · Molecular Junctions and Nanostructures · Quantum and electron transport phenomena

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Physikalisches Institut Karlsruhe Institute of Technology (KIT) 76131 Karlsruhe Germany

Laboratory for Electron Microscopy Karlsruhe Institute of Technology (KIT) 76131 Karlsruhe Germany

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

Institut de Ciència Molecular (ICMol) Universitat de València C/Catedrático José Beltrán Martínez 2 46980 Paterna Valencia Spain

Quantum Control Group Institute for Quantum Materials and Technologies (IQMT) Karlsruhe Institute of Technology (KIT) 76021 Karlsruhe Germany

Funding

Ministerio de Ciencia e Innovación · Deutsche Forschungsgemeinschaft

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