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We report on the unprecedented direct observation of spin-polarization transfer across colloidal magneto-plasmonic Au@Fe-oxide core@shell nanocrystal heterostructures. A magnetic moment is induced into the Au domain when the magnetic shell contains a reduced Fe-oxide phase in direct contact with the noble metal. An increased hole density in the Au states suggested occurrence of a charge-transfer process concomitant to the magnetization transfer. The angular to spin magnetic moment ratio, morb/mspin, for the Au 5d states, which was found to be equal to 0.38, appeared to be unusually large when compared to previous findings. A mechanism relying on direct hybridization between the Au and Fe states at the core/shell interface is proposed to account for the observed transfer of the magnetic moment.
American Chemical Society
Publication date: 
22 Jan 2013

Francesco Pineider, César de Julián Fernández, Valeria Videtta, Elvio Carlino, Awni Al Hourani, Fabrice Wilhelm, Andrei Rogalev, P Davide Cozzoli, Paolo Ghigna, Claudio Sangregorio

Biblio References: 
Volume: 7 Issue: 1 Pages: 857-866
ACS nano