title: Spin-polarization transfer in colloidal magnetic-plasmonic Au/iron oxide hetero-nanocrystals.
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.
authors.affiliation: C.N.R.-I.S.T.M. c/o Dipartimento di Scienze Chimiche, Università di Padova and INSTM, Via Marzolo 1, I-35131, Padova, Italy.
authors.forename: Francesco
authors.initials: F
authors.lastname: Pineider
authors.forename: César
authors.initials: C
authors.lastname: de Julián Fernández
authors.forename: Valeria
authors.initials: V
authors.lastname: Videtta
authors.forename: Elvio
authors.initials: E
authors.lastname: Carlino
authors.forename: Awni
authors.initials: A
authors.lastname: al Hourani
authors.forename: Fabrice
authors.initials: F
authors.lastname: Wilhelm
authors.forename: Andrei
authors.initials: A
authors.lastname: Rogalev
authors.forename: P Davide
authors.initials: PD
authors.lastname: Cozzoli
authors.forename: Paolo
authors.initials: P
authors.lastname: Ghigna
authors.forename: Claudio
authors.initials: C
authors.lastname: Sangregorio
mesh_terms: D003102:Colloids / Q000737:chemistry*; D005290:Ferric Compounds / Q000737:chemistry*; D006046:Gold / Q000737:chemistry*; D060526:Magnetic Fields; D008422:Materials Testing; D053768:Metal Nanoparticles / Q000737:chemistry*; D013113:Spin Labels; D020349:Surface Plasmon Resonance / Q000379:methods*
chemical_list: D003102:Colloids; D005290:Ferric Compounds; D013113:Spin Labels; C000499:ferric oxide; D006046:Gold