Transition metal complexes in contact with metal surfaces are model systems to study complex magnetic processes and essential building blocks for spintronics. Spin states of the magnetic center are normally controlled by the exchange interaction with a ferromagnetic substrate. Here, we demonstrate that for iron phthalocyanine (FePc) molecules absorbed on a non-magnetic Au(111) surface, the molecule-substrate exchange interaction can also be engineered by varying the external magnetic field. Consequently, the Kondo resonance signature is tuned in a controlled way from a Kondo dip to a Kondo peak. This originates from the transition of the molecular orbitals responsible for the Kondo effect. This work opens up an avenue for molecular spintronics in terms of control and tunability.

Tuning the exchange coupling of transition metal complexes to gold substrates by magnetic fields

253rd National Meeting (2017)

The official archive and repository for all ACS Meetings & Expositions abstracts and select posters or presentations.