Magnetic-plasmonic core-shell nanoparticles

Carly S Levin, Cristina Hofmann, Tamer A Ali, Anna T. Kelly, Emilia Morosan, Peter Nordlander, Kenton H. Whitmire, Naomi J. Halas

Research output: Contribution to journalArticle

279 Scopus citations

Abstract

Nanoparticles composed of magnetic cores with continuous Au shell layers simultaneously possess both magnetic and plasmonic properties. Faceted and tetracubic nanocrystals consisting of wustite with magnetite-rich corners and edges retain magnetic properties when coated with a Au shell layer, with the composite nanostructures showing ferrimagnetic behavior. The plasmonic properties are profoundly influenced by the high dielectric constant of the mixed iron oxide nanocrystalline core. A comprehensive theoretical analysis that examines the geometric plasmon tunability over a range of core permittivities enables us to identify the dielectric properties of the mixed oxide magnetic core directly from the plasmonic behavior of the core-shell nanoparticle.

Original languageEnglish (US)
Pages (from-to)1379-88
Number of pages10
JournalACS Nano
Volume3
Issue number6
DOIs
StatePublished - Jun 23 2009

Keywords

  • Magnetics
  • Nanoparticles
  • Journal Article
  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't
  • Research Support, U.S. Gov't, Non-P.H.S.

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