Magnetic fingerprint of individual Fe4 molecular magnets under compression by a 
scanning tunnelling microscope

Burgess, J.; Malavolti, L.; Lanzilotto, V.; Mannini, M.; Yan, S.; Ninova, S.; Totti, F.; Rolf-Pissarczyk, S.; Cornia, A.; Sessoli, R.; Loth, S.

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Magnetic fingerprint of individual Fe₄ molecular magnets under compression by a scanning tunnelling microscope

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Loth, S.
Dynamics of Nanoelectronic Systems, Independent Research Groups, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;
Max Planck Institute for Solid State Research;

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Citation

Burgess, J., Malavolti, L., Lanzilotto, V., Mannini, M., Yan, S., Ninova, S., et al. (2015). Magnetic fingerprint of individual Fe₄ molecular magnets under compression by a scanning tunnelling microscope. Nature Communications, 6: 8216.

Cite as: https://hdl.handle.net/21.11116/0000-000E-C9B8-0

Abstract

Single-molecule magnets (SMMs) present a promising avenue to develop spintronic technologies. Addressing individual molecules with electrical leads in SMM-based spintronic devices remains a ubiquitous challenge: interactions with metallic electrodes can drastically modify the SMM's properties by charge transfer or through changes in the molecular structure. Here, we probe electrical transport through individual Fe-4 SMMs using a scanning tunnelling microscope at 0.5 K. Correlation of topographic and spectroscopic information permits identification of the spin excitation fingerprint of intact Fe-4 molecules. Building from this, we find that the exchange coupling strength within the molecule's magnetic core is significantly enhanced. First-principles calculations support the conclusion that this is the result of confinement of the molecule in the two-contact junction formed by the microscope tip and the sample surface.