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Spin-polarization transfer in colloidal magnetic-plasmonic Au/iron oxide heteronanocrystals (Articolo in rivista)

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Spin-polarization transfer in colloidal magnetic-plasmonic Au/iron oxide heteronanocrystals (Articolo in rivista) (literal)

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Francesco Pineider, César de Julián Fernández, Valeria Videtta, Elvio Carlino, Awni al Hourani, Fabrice Wilhelm, Andrei Rogalev, P. Davide Cozzoli, Paolo Ghigna, Claudio Sangregorio (2013)
Spin-polarization transfer in colloidal magnetic-plasmonic Au/iron oxide heteronanocrystals
in ACS nano (Online)
(literal)

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

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C.N.R. - I.S.T.M. Via C. Golgi 19, I-20133 Milano, Italy. INSTM and Dipartimento di Chimica \"U. Schiff\", Università degli Studi di Firenze, Via della Lastruccia 3-13, Sesto Fiorentino, I-50019 Firenze, Italy National Nanotechnology Laboratory (NNL), CNR Istituto Nanoscienze, c/o Distretto Tecnologico, Via per Arnesano km 5, I-73100 Lecce, Italy TASC National Laboratory, IOM-CNR, Area Science Park - Basovizza, Building MM, SS 14, Km 163.5, I-34149 Trieste, Italy INSTM and Dipartimento di Fisica \"A. Volta\", Università di Pavia, Via Bassi 4, I-27100 Pavia, Italy European Synchrotron Radiation Facility (ESRF), BP-220, F38043, Grenoble, France INSTM and Dipartimento di Matematica e Fisica \"E. De Giorgi\", Università del Salento, Via per Arnesano, I-73100 Lecce, Italy INSTM and Dipartimento di Chimica, Università di Pavia, Viale Taramelli 16, I-27100 Pavia, Italy (literal)

Titolo

Spin-polarization transfer in colloidal magnetic-plasmonic Au/iron oxide heteronanocrystals (literal)

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, 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 (literal)

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