Magnetic-plasmonic core-shell nanoparticles.
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.
Department of Chemistry, Rice University, Houston, TX 77251-1892, USA.
Carly S
CS
Levin
Cristina
C
Hofmann
Tamer A
TA
Ali
Anna T
AT
Kelly
Emilia
E
Morosan
Peter
P
Nordlander
Kenton H
KH
Whitmire
Naomi J
NJ
Halas
D008280:Magnetics; D053758:Nanoparticles