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The rational design of complex nanostructures is of paramount importance to gain control over their chemical and physical properties. Recently, magnetic-plasmonic heterostructured nanocrystals have been recognized as key players in nanomedicine as multifunctional therapeutic-diagnostic tools and in catalysis. Here we show how the properties of gold-iron oxide heterostructured nanocrystals can be tuned by chemical doping of the magnetic subunit. The divalent cations in the iron oxide were substituted with cobalt and manganese to obtain a general formula Au-MFe2O4 (M = Fe, Co, Mn). Magnetic properties of the heterostructures could be tuned, while maintaining well-defined plasmon resonance signatures, confirming the dual magnetic-plasmonic functional capability of these nanostructures.
The financial support of European Union’s Horizon2020 Research and Innovation program under Grant agreements No. 737093 (FEMTOTERABYTE, http://www.physics.gu.se/ femtoterabyte) and No. 720853 (AMPHIBIAN, http://amphi bianproject.eu/), University of Pisa through project PRA_ 2017_25 and INFN through HADROMAG project is gratefully acknowledged. E. F. thanks the support of the "Galileo Galilei" fellowship from the University of Pisa.