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Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures
Published on: November 21, 2019
Spin-polarization transfer in colloidal magnetic-plasmonic Au/iron oxide hetero-nanocrystals
Francesco Pineider1, César de Julián Fernández, Valeria Videtta
1C.N.R.-I.S.T.M. c/o Dipartimento di Scienze Chimiche, Università di Padova and INSTM, Via Marzolo 1, I-35131, Padova, Italy.
Abstract:
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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