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 journalArticlepeer-review

341 Scopus citations


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
Issue number6
StatePublished - Jun 23 2009


  • 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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