Journal
ACS NANO
Volume 7, Issue 1, Pages 857-866Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nn305459m
Keywords
colloidal nanocrystals; core-shell heterostructures; spin polarization; X-ray spectroscopy; nanomagnetism; magneto-plasmonics
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Funding
- Fondazione Cariplo [2010-0612]
- Italian Ministry of Education, University and Research through the project AEROCOMP [DM48391]
- FIRB Project [MIUR RBPR05JH2P]
- FIRB Futuro in Ricerca [MIUR RBFR10OA10]
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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, m(orb)/m(spin) 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.
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